LKQ (LKQ) 10-K 1 Mar 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2018	Feb. 22, 2019	Jun. 30, 2018
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	LKQ
Entity Registrant Name	LKQ CORP
Entity Central Index Key	1,065,696
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		314,775,176
Entity Public Float			$ 10.1

Consolidated Statements of Inco

Consolidated Statements of Income Statement - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Income Statement [Abstract]
Revenue	$ 11,876,674	$ 9,736,909		$ 8,584,031
Cost of goods sold	7,301,817	5,937,286		5,232,328
Gross margin	4,574,857	3,799,623		3,351,703
Selling, general and administrative expenses (1), (2)	3,352,731	2,715,407	[1]	2,359,110
Restructuring and acquisition related expenses	32,428	19,672		37,762
Impairment of goodwill	33,244	0		0
Depreciation and amortization	274,213	219,546		191,433
Operating income	882,241	844,998		763,398
Other expense (income):
Interest expense	146,377	101,640		88,263
Loss on debt extinguishment	1,350	456		26,650
Gains on foreign exchange contracts - acquisition related	0	0		(18,342)
Gains on bargain purchases	(2,418)	(3,870)		(8,207)
Interest income and other income, net (2)	(6,499)	(19,855)		(2,247)
Total other expense, net	138,810	78,371		86,117
Income from continuing operations before provision for income taxes	743,431	766,627		677,281
Provision for income taxes	191,395	235,560		220,566
Equity in (losses) earnings of unconsolidated subsidiaries	(64,471)	5,907		(592)
Income from continuing operations	487,565	536,974		456,123
Net (loss) income from discontinued operations	(4,397)	(6,746)		7,852
Net income	483,168	530,228		463,975
Less: net income (loss) attributable to noncontrolling interest	3,050	(3,516)		0
Net income attributable to LKQ stockholders	$ 480,118	$ 533,744		$ 463,975
Basic earnings per share: (3)
Income from continuing operations	$ 1.55	$ 1.74		$ 1.49
Net (loss) income from discontinued operations	(0.01)	(0.02)		0.03
Net income	1.54	1.72		1.51
Less: net income (loss) attributable to noncontrolling interest	0.01	(0.01)		0
Net income attributable to LKQ stockholders	1.53	1.73		1.51
Diluted earnings per share: (3)
Income from continuing operations	1.54	1.73		1.47
Net (loss) income from discontinued operations	(0.01)	(0.02)		0.03
Net income	1.53	1.71		1.50
Less: net income (loss) attributable to noncontrolling interest	0.01	(0.01)		0
Net income attributable to LKQ stockholders	$ 1.52	$ 1.72		$ 1.50
[1]	(1) Selling, general and administrative expenses contain facility and warehouse expenses and distribution expenses that were previously shown separately.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 483,168	$ 530,228	$ 463,975
Less: net income (loss) attributable to noncontrolling interest	3,050	(3,516)	0
Net income attributable to LKQ stockholders	480,118	533,744	463,975
Other comprehensive income (loss):
Foreign currency translation, net of tax	(108,523)	200,596	(175,639)
Net change in unrealized gains/losses on cash flow hedges, net of tax	350	3,447	9,023
Net change in unrealized gains/losses on pension plans, net of tax	697	(6,035)	4,911
Net change in other comprehensive loss from unconsolidated subsidiaries	(2,343)	(1,309)	0
Other comprehensive (loss) income	(109,819)	196,699	(161,705)
Comprehensive income	373,349	726,927	302,270
Less: comprehensive income (loss) attributable to noncontrolling interest	3,050	(3,516)	0
Comprehensive income attributable to LKQ stockholders	$ 370,299	$ 730,443	$ 302,270

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Treasury Stock, Common, Shares	2,271,707
Assets
Cash and cash equivalents	$ 331,761	$ 279,766
Current assets:
Receivables, net	1,154,083	1,027,106
Inventories	2,836,075	2,380,783
Prepaid expenses and other current assets	199,030	134,479
Total current assets	4,520,949	3,822,134
Property, plant and equipment, net	1,220,162	913,089
Intangible assets:
Goodwill	4,381,458	3,536,511
Other intangibles, net	928,752	743,769
Equity method investments	179,169	208,404
Other assets	162,912	142,965
Total assets	11,393,402	9,366,872
Current liabilities:
Accounts payable	942,398	788,613
Accrued expenses:
Accrued payroll-related liabilities	172,005	143,424
Other accrued expenses	288,425	218,600
Refund liability	104,585	0
Other current liabilities	61,109	45,727
Current portion of long-term obligations	121,826	126,360
Total current liabilities	1,690,348	1,322,724
Long-term obligations, excluding current portion	4,188,674	3,277,620
Deferred income taxes	311,434	252,359
Other noncurrent liabilities	364,194	307,516
Commitments and contingencies
Stockholders’ equity:
Common stock, $0.01 par value, 1,000,000,000 shares authorized, 318,417,821 shares issued and 316,146,114 shares outstanding at December 31, 2018; 309,126,386 shares issued and outstanding at December 31, 2017	3,184	3,091
Additional paid-in capital	1,415,188	1,141,451
Retained earnings	3,598,876	3,124,103
Accumulated other comprehensive loss	(174,950)	(70,476)
Treasury stock, at cost; 2,271,707 shares at December 31, 2018	(60,000)	0
Total Company stockholders' equity	4,782,298	4,198,169
Noncontrolling interest	56,454	8,484
Total stockholders' equity	4,838,752	4,206,653
Total liabilities and stockholders’ equity	$ 11,393,402	$ 9,366,872

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	1,000,000,000	1,000,000,000
Common stock, shares issued	318,417,821	309,126,386
Common stock, shares outstanding	316,146,114	309,126,386
Treasury Stock, Common, Shares	2,271,707

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 483,168	$ 530,228	$ 463,975
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	294,077	230,203	206,086
Impairment on Mekonomen equity method investment	70,895	0	0
Impairment of goodwill	33,244	0	0
Stock-based compensation expense	22,760	22,832	22,472
Loss on debt extinguishment	1,350	456	26,650
Loss on sale of business	0	10,796	0
Impairment on net assets of discontinued operations	0	0	26,677
Gains on foreign exchange contracts - acquisition related	0	0	(18,342)
Gains on bargain purchases	(2,418)	(3,870)	(8,207)
Deferred income taxes	(2,180)	(46,537)	(16,162)
Other	9,534	1,301	19,550
Changes in operating assets and liabilities, net of effects from acquisitions and dispositions:
Receivables, net	241	(55,979)	(50,801)
Inventories	(127,153)	(203,857)	(64,114)
Prepaid income taxes/income taxes payable	(2,125)	8,376	14,944
Accounts payable	(77,621)	45,136	18,577
Other operating assets and liabilities	6,967	(20,185)	(6,291)
Net cash provided by operating activities	710,739	518,900	635,014
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(250,027)	(179,090)	(207,074)
Proceeds from Disposal of Property, Plant, and Equipment	27,659	8,707	3,510
Acquisitions, net of cash and restricted cash acquired	(1,214,995)	(513,088)	(1,349,339)
Proceeds from disposals of business/investment	0	301,297	10,304
Investments in unconsolidated subsidiaries	(60,300)	(7,664)	(185,671)
Proceeds from foreign exchange contracts	0	0	18,342
Receipts of deferred purchase price on receivables under factoring arrangements	36,991	0	0
Other investing activities, net	1,733	5,243	0
Net cash used in investing activities	(1,458,939)	(384,595)	(1,709,928)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options	5,303	7,470	7,963
Taxes paid related to net share settlements of stock-based compensation awards	(5,567)	(5,525)	(4,438)
Debt issuance costs	(21,128)	(4,267)	(16,554)
Proceeds from issuance of Euro Notes (2024)	0	0	563,450
Proceeds from issuance of Euro Notes (2026/28)	1,232,100	0	0
Purchase of treasury stock	60,000	0	0
Borrowings under revolving credit facilities	1,667,325	839,171	2,636,596
Repayments under revolving credit facilities	(1,528,970)	(946,477)	(1,748,664)
Borrowings under term loans	0	0	582,115
Repayments under term loans	(354,800)	(27,884)	(255,792)
Borrowings under receivables securitization facility	10,120	11,245	106,400
Repayments under receivables securitization facility	(120)	(11,245)	(69,400)
Repayments of assumed debt and notes issued from acquisitions	(54,888)	0	0
(Repayments) borrowings of other debt, net	(11,730)	19,706	(31,156)
Repayment of Rhiag debt and related payments	0	0	(543,347)
Other financing activities, net	(5,350)	(5,239)	1,436
Net cash provided by (used in) financing activities	882,995	(112,567)	1,225,737
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(77,311)	23,512	(3,704)
Net increase in cash, cash equivalents and restricted cash	57,484	45,250	147,119
Cash, cash equivalents and restricted cash of continuing operations, beginning of period	279,766	227,400	87,397
Add: Cash, cash equivalents and restricted cash of discontinued operations, beginning of period	0	(7,116)	0
Cash, cash equivalents and restricted cash of continuing and discontinued operations, beginning of period	279,766	234,516	87,397
Cash, cash equivalents and restricted cash, end of period	337,250	279,766	234,516
Reconciliation Of Cash, Cash Equivalents And Restricted Cash [Abstract]
Cash and Cash Equivalents	331,761	279,766	227,400
Restricted Cash	5,489	0	0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	337,250	279,766	227,400
Supplemental disclosure of cash paid for:
Income taxes, net of refunds	200,098	273,019	230,036
Interest	137,866	95,707	86,021
Supplemental disclosure of noncash investing and financing activities:
Stock issued in acquisitions	251,334	0	0
Contingent consideration liabilities	3,107	6,234	0
Notes payable and other financing obligations, including notes issued and debt assumed in connection with business acquisitions/investment	105,566	59,045	568,032
Noncash property, plant and equipment additions	16,518	18,122	10,715
Notes and other financing receivables in connection with disposals of business/investment	$ 0	$ 4,000	$ 0

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock, Common [Member]	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interest
January 1, 2016 at Dec. 31, 2015		305,574
January 1, 2016 at Dec. 31, 2015	$ 3,114,682	$ 3,055		$ 1,090,713	$ 2,126,384	$ (105,470)
Net income	463,975
Other comprehensive loss	(161,705)					(161,705)
Vesting of restricted stock units, net of shares withheld for employee tax		847
Vesting of restricted stock units, net of shares withheld for employee tax	(4,438)	$ 9		(4,447)
Stock-based compensation expense	22,472			22,472
Exercise of stock options		1,124
Exercise of stock options	7,963	$ 11		7,952
January 1, 2016 at Dec. 31, 2016		307,545
January 1, 2016 at Dec. 31, 2016	3,442,949	$ 3,075		1,116,690	2,590,359	(267,175)
Net income attributable to LKQ stockholders	463,975				463,975
Stock issued in acquisitions	0
Net income	530,228
Other comprehensive loss	196,699					196,699
Vesting of restricted stock units, net of shares withheld for employee tax		749
Vesting of restricted stock units, net of shares withheld for employee tax	(4,325)	$ 7		(4,332)
Stock-based compensation expense	22,832			22,832
Exercise of stock options		867
Exercise of stock options	7,470	$ 9		7,461
January 1, 2016 at Dec. 31, 2017		309,127
January 1, 2016 at Dec. 31, 2017	4,206,653	$ 3,091		1,141,451	3,124,103	(70,476)	$ 8,484
Net income attributable to LKQ stockholders	533,744				533,744
Stock issued in acquisitions	0
Tax withholdings related to net share settlements of stock-based compensation awards		(34)
Shares withheld for net share settlement of stock option awards	(1,200)			(1,200)
Capital contributions from, net of dividends to, noncontrolling interest shareholder	12,000						12,000
Acquired noncontrolling interest	0
Net income	483,168
Other comprehensive loss	(109,819)					(109,819)
Vesting of restricted stock units, net of shares withheld for employee tax		603
Vesting of restricted stock units, net of shares withheld for employee tax	(3,796)	$ 6		(3,802)
Stock-based compensation expense	22,760			22,760
Exercise of stock options		686
Exercise of stock options	5,303	$ 7		5,296
January 1, 2016 at Dec. 31, 2018		318,418
January 1, 2016 at Dec. 31, 2018	4,838,752	$ 3,184	$ (60,000)	1,415,188	3,598,876	(174,950)	56,454
Net income attributable to LKQ stockholders	480,118				480,118
Stock issued in acquisitions		8,056
Stock issued in acquisitions	251,334	$ 81		251,253
Treasury Stock, Shares, Acquired			(2,272)
Treasury Stock, Value, Acquired, Cost Method	60,000		$ 60,000
Tax withholdings related to net share settlements of stock-based compensation awards		(54)
Shares withheld for net share settlement of stock option awards	(1,771)	$ (1)		$ (1,770)
Adoption of ASU 2018-02 (see Note 4)	5,345				$ (5,345)	$ 5,345
Capital contributions from, net of dividends to, noncontrolling interest shareholder	810
Proceeds from Contributed Capital							810
Acquired noncontrolling interest	$ 44,110						$ 44,110
Treasury Stock, Value			(2,272)

Business

Business	12 Months Ended
	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business	Business The financial statements presented reflect the consolidation of LKQ Corporation, a Delaware corporation, and its subsidiaries. LKQ Corporation is a holding company and all operations are conducted by subsidiaries. When the terms "LKQ," "the Company," "we," "us," or "our" are used in this document, those terms refer to LKQ Corporation and its consolidated subsidiaries. We are a leading provider of alternative vehicle collision replacement products and alternative vehicle mechanical replacement products, with our sales, processing, and distribution facilities reaching most major markets in the United States and Canada. We are also a leading provider of alternative vehicle replacement and maintenance products in the United Kingdom, Germany, the Benelux region (Belgium, Netherlands, and Luxembourg), Italy, Czech Republic, Poland, Slovakia, Austria, and various other European countries. In addition to our wholesale operations, we operate self service retail facilities across the U.S. that sell recycled automotive products from end-of-life-vehicles. We are also a leading distributor of specialty vehicle aftermarket equipment and accessories reaching most major markets in the U.S. and Canada. In total, we operate approximately 1,700 facilities.

Business Combinations (Notes)

Business Combinations (Notes)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Business Combinations	Business Combinations On May 30, 2018 , we acquired Stahlgruber, a leading European wholesale distributor of aftermarket spare parts for passenger cars, tools, capital equipment and accessories with operations in Germany, Austria, Italy, Slovenia, and Croatia, with further sales to Switzerland. Total acquisition date fair value of the consideration for our Stahlgruber acquisition was € 1.2 billion ($ 1.4 billion ), composed of € 1.0 billion ($ 1.1 billion ) of cash paid (net of cash acquired), and € 215 million ($ 251 million ) of newly issued shares of LKQ common stock. We financed the acquisition with the proceeds from €1.0 billion ( $1.2 billion ) of senior notes, the direct issuance to Stahlgruber's owner of 8,055,569 newly issued shares of LKQ common stock, and borrowings under our existing revolving credit facility. On May 3, 2018, the European Commission cleared the acquisition for the entire European Union, except with respect to the wholesale automotive parts business in the Czech Republic. The acquisition of the Czech Republic wholesale business has been referred to the Czech Republic competition authority for review. The Czech Republic wholesale business represents an immaterial portion of Stahlgruber's revenue and profitability. We recorded $ 908 million of goodwill related to our acquisition of Stahlgruber, of which we expect $300 million to be deductible for income tax purposes. In the period between the acquisition date and December 31, 2018 , Stahlgruber, which is reported in our Europe reportable segment, generated third party revenue of $ 1.1 billion and operating income of $ 52 million . In addition to our acquisition of Stahlgruber, during the year ended December 31, 2018, we completed acquisitions of four wholesale businesses in North America and nine wholesale businesses in Europe. Total acquisition date fair value of the consideration for these acquisitions was $ 99 million , composed of $ 85 million of cash paid (net of cash and restricted cash acquired), $11 million of notes payable, and $3 million for the estimated value of contingent payments to former owners (with maximum potential payments totaling $5 million ). During the year ended December 31, 2018 , we recorded $68 million of goodwill related to these acquisitions, of which we expect $4 million to be deductible for income tax purposes. In the period between the acquisition dates and December 31, 2018 , these acquisitions generated third party revenue of $46 million and operating income of $3 million . During the year ended December 31, 2017, we completed 26 acquisitions including 6 wholesale businesses in North America, 16 wholesale businesses in Europe and 4 Specialty businesses. Our acquisitions in Europe included the acquisition of four aftermarket parts distribution businesses in Belgium in July 2017 . Our Specialty acquisitions included the acquisition of the aftermarket business of Warn, a leading designer, manufacturer and marketer of high performance vehicle equipment and accessories, in November 2017 . Total acquisition date fair value of the consideration for our 2017 acquisitions was $542 million , composed of $510 million of cash paid (net of cash acquired), $6 million for the estimated value of contingent payments to former owners (with maximum potential payments totaling $19 million ), $5 million of other purchase price obligations (non-interest bearing) and $20 million of notes payable. We typically fund our acquisitions using borrowings under our credit facilities or other financing arrangements. During the year ended December 31, 2017, we recorded $307 million of goodwill related to these acquisitions. On March 18, 2016, we acquired Rhiag, a distributor of aftermarket spare parts for passenger cars and commercial vehicles in Italy, Czech Republic, Slovakia, Switzerland, Hungary, Romania, Ukraine, Bulgaria, Poland and Spain. This acquisition expanded LKQ's geographic presence in continental Europe and provided additional purchasing synergies. Total acquisition date fair value of the consideration for our Rhiag acquisition was €534 million ( $602 million ), composed of €534 million ( $601 million ) of cash paid (net of cash acquired) and €1 million ( $1 million ) of intercompany balances considered to be effectively settled as part of the transaction. In addition, we assumed €489 million ( $551 million ) of existing Rhiag debt as of the acquisition date. We recorded $591 million ( $585 million in 2016 and $5 million in the three months ended March 31, 2017) of goodwill related to our acquisition of Rhiag. Related to the funding of the purchase price of the Rhiag acquisition, LKQ entered into foreign currency forward contracts in March 2016 to acquire a total of €588 million . The rates locked in under the foreign currency forwards were favorable to the spot rate on the settlement date, and as a result, these derivative contracts generated a gain of $18 million during the year ended December 31, 2016. The gain on the foreign currency forwards was recorded in Gains on foreign exchange contracts - acquisition related on our consolidated statement of income for the year ended December 31, 2016. On April 21, 2016, we acquired PGW. At acquisition, PGW’s business comprised aftermarket automotive replacement glass distribution services and automotive glass manufacturing. The acquisition expanded our addressable market in North America and created distribution synergies with our existing network. Total acquisition date fair value of the consideration for our PGW acquisition was $662 million , consisting of cash paid (net of cash acquired). We recorded $208 million ( $205 million in 2016 and $3 million in the six months ended June 30, 2017) of goodwill related to our acquisition of PGW. On October 4, 2016, we acquired substantially all of the business assets of Andrew Page, a distributor of aftermarket automotive parts in the U.K., out of receivership. The acquisition was subject to regulatory approval by the CMA in the U.K. The CMA concluded its review on October 31, 2017 and required us to divest less than 10% of the acquired locations. Total acquisition date fair value of the consideration for this acquisition was £16 million ( $20 million ). In connection with the acquisition, we recorded a gain on bargain purchase of $10 million ( $8 million recorded in 2016 and $2 million recorded in 2017), which is reported on a separate line in our consolidated statements of income. We believe that we were able to acquire the net assets of Andrew Page for less than fair value as a result of (i) Andrew Page's financial difficulties that put the company into receivership prior to our acquisition and (ii) a motivated seller that desired to complete the sale in an expedient manner to ensure continuity of the business. In addition to our acquisitions of Rhiag, PGW and Andrew Page, we acquired seven wholesale businesses in Europe and five wholesale businesses in North America during the year ended December 31, 2016. Total acquisition date fair value of the consideration for these acquisitions was $76 million , composed of $68 million of cash paid (net of cash acquired), $4 million of notes payable and $4 million of other purchase price obligations (non-interest bearing). During the year ended December 31, 2016, we recorded $52 million of goodwill related to these acquisitions and immaterial adjustments to preliminary purchase price allocations related to certain of our 2015 acquisitions. Our acquisitions are accounted for under the purchase method of accounting and are included in our consolidated financial statements from the dates of acquisition. The purchase prices were allocated to the net assets acquired based upon estimated fair values at the dates of acquisition. The purchase price allocations for the acquisitions made during the year ended December 31, 2018 are preliminary as we are in the process of determining the following: 1) valuation amounts for certain receivables, inventories and fixed assets acquired; 2) valuation amounts for certain intangible assets acquired; 3) the acquisition date fair value of certain liabilities assumed; and 4) the tax basis of the entities acquired. We have recorded preliminary estimates for certain of the items noted above and will record adjustments, if any, to the preliminary amounts upon finalization of the valuations. From the date of our preliminary allocation for Stahlgruber in the second quarter of 2018 through December 31, 2018, we recorded adjustments based on our valuation procedures, primarily related to current liabilities, inventory, deferred income taxes, debt assumed, and property, plant and equipment that resulted in the allocation of $22 million of goodwill to acquired net assets. From the date of our preliminary allocations for our other acquisitions completed in the first nine months of 2018, we recorded adjustments based on our valuation procedures, primarily related to other intangibles, that resulted in the allocation of $14 million of goodwill to acquired net assets. The income statement effect of these measurement period adjustments for our Stahlgruber acquisition and our other acquisitions completed in the first nine months of 2018 that would have been recorded in previous reporting periods if the adjustments had been recognized as of the acquisition dates was immaterial. The balance sheet impact and income statement effect of other measurement-period adjustments recorded for acquisitions completed in prior periods were immaterial. The purchase price allocations for the acquisitions completed during the years ended December 31, 2018 and 2017 are as follows (in thousands): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions (1) Total All (2) Receivables $ 144,826 $ 19,171 $ 163,997 $ 73,782 Receivable reserves (2,818 ) (918 ) (3,736 ) (7,032 ) Inventories (3) 380,238 14,021 394,259 150,342 Prepaid expenses and other current assets 10,970 1,851 12,821 (295 ) Property , plant and equipment 271,292 5,711 277,003 41,039 Goodwill 908,253 64,637 972,890 314,817 Other intangibles 285,255 35,159 320,414 181,216 Other assets 16,625 37 16,662 3,257 Deferred income taxes (78,130 ) (5,285 ) (83,415 ) (65,087 ) Current liabilities assumed (346,788 ) (20,116 ) (366,904 ) (111,484 ) Debt assumed (79,925 ) (4,875 ) (84,800 ) (33,586 ) Other noncurrent liabilities assumed (4) (80,824 ) (10,306 ) (91,130 ) (1,917 ) Noncontrolling interest (44,110 ) — (44,110 ) — Contingent consideration liabilities — (3,107 ) (3,107 ) (6,234 ) Other purchase price obligations (6,084 ) 3,623 (2,461 ) (5,074 ) Stock issued (251,334 ) — (251,334 ) — Notes issued — (11,347 ) (11,347 ) (20,187 ) Settlement of pre-existing balances — — — 242 Gains on bargain purchases (5) — (2,418 ) (2,418 ) (3,870 ) Settlement of other purchase price obligations (non-interest bearing) — 1,711 1,711 3,159 Cash used in acquisitions, net of cash and restricted cash acquired $ 1,127,446 $ 87,549 $ 1,214,995 $ 513,088 (1) The amounts recorded during the year ended December 31, 2018 include a $5 million adjustment to increase other intangibles related to our Warn acquisition and $4 million of adjustments to reduce other purchase price obligations related to other 2017 acquisitions. (2) The amounts recorded during the year ended December 31, 2017 include $6 million and $3 million of adjustments to reduce property, plant and equipment and other assets for Rhiag and PGW, respectively. (3) The amounts for our 2017 acquisitions include a $4 million step-up adjustment related to our Warn acquisition. (4) The amount recorded for our acquisition of Stahlgruber includes a $79 million liability for certain pension obligations. See Note 14, "Employee Benefit Plans" for information related to our defined benefit plans. (5) The amounts recorded during the year ended December 31, 2018 are due to the gains on bargain purchases related to (i) an acquisition in Europe completed in the second quarter of 2017 as a result of changes in the acquisition date fair value of the consideration, and (ii) three acquisitions in Europe completed during 2018 as a result of changes to our estimates of the fair values of the net assets acquired. The amount recorded during the year ended December 31, 2017 includes a $2 million increase to the gain on bargain purchase recorded for our Andrew Page acquisition as a result of changes to our estimate of the fair value of the net assets acquired. The remainder of the gain on bargain purchase recorded during the year ended December 31, 2017 is an immaterial amount related to the previously mentioned acquisition in Europe completed in the second quarter of 2017. The fair value of our intangible assets is based on a number of inputs, including projections of future cash flows, discount rates, assumed royalty rates and customer attrition rates, all of which are Level 3 inputs. We used the relief-from-royalty method to value trade names, trademarks, software and other technology assets, and we used the multi-period excess earnings method to value customer relationships. The relief-from-royalty method assumes that the intangible asset has value to the extent that its owner is relieved of the obligation to pay royalties for the benefits received from the intangible asset. The multi-period excess earnings method is based on the present value of the incremental after-tax cash flows attributable only to the customer relationship after deducting contributory asset charges. The fair value of our property, plant and equipment is determined using inputs such as market comparables and current replacement or reproduction costs of the asset, adjusted for physical, functional and economic factors; these adjustments to arrive at fair value use unobservable inputs in which little or no market data exists, and therefore, these inputs are considered to be Level 3 inputs. See Note 12, "Fair Value Measurements " for further information regarding the tiers in the fair value hierarchy. The acquisition of Stahlgruber expands LKQ's geographic presence in continental Europe and serves as an additional strategic hub for our European operations. In addition, we believe the acquisition of Stahlgruber will allow for continued improvement in procurement, logistics and infrastructure optimization. The primary objectives of our other acquisitions made during the years ended December 31, 2018 and 2017 were to create economic value for our stockholders by enhancing our position as a leading source for alternative collision and mechanical repair products and to expand into other product lines and businesses that may benefit from our operating strengths. Certain 2017 acquisitions were completed to enable us to align our distribution model in the Benelux region. When we identify potential acquisitions, we attempt to target companies with a leading market presence, an experienced management team and workforce that provides a fit with our existing operations, and strong cash flows. For certain of our acquisitions, we have identified cost savings and synergies as a result of integrating the company with our existing business that provide additional value to the combined entity. In many cases, acquiring companies with these characteristics will result in purchase prices that include a significant amount of goodwill. The following unaudited pro forma summary presents the effect of the businesses acquired during the year ended December 31, 2018 as though the businesses had been acquired as of January 1, 2017, the businesses acquired during the year ended December 31, 2017 as though they had been acquired as of January 1, 2016, and the businesses acquired during the year ended December 31, 2016 as though they had been acquired as of January 1, 2015. The pro forma adjustments are based upon unaudited financial information of the acquired entities (in thousands, except per share data): Year Ended December 31, 2018 2017 2016 Revenue, as reported $ 11,876,674 $ 9,736,909 $ 8,584,031 Revenue of purchased businesses for the period prior to acquisition: Stahlgruber 815,405 1,756,893 — Rhiag — — 213,376 PGW (1) — — 102,540 Other acquisitions 72,301 448,721 854,601 Pro forma revenue $ 12,764,380 $ 11,942,523 $ 9,754,548 Income from continuing operations, as reported (2) $ 487,565 $ 536,974 $ 456,123 Income from continuing operations of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments: Stahlgruber 17,309 4,796 — Rhiag — — (84 ) PGW (1), (3) — — 7,574 Other acquisitions 1,507 16,667 19,323 Acquisition related expenses, net of tax (4) 14,414 8,787 11,602 Pro forma income from continuing operations 520,795 567,224 494,538 Less: Pro forma net income attributable to noncontrolling interest 2,799 1,095 — Pro forma income from continuing operations attributable to LKQ stockholders $ 517,996 $ 566,129 $ 494,538 Earnings per share from continuing operations, basic - as reported $ 1.55 $ 1.74 $ 1.49 Effect of purchased businesses for the period prior to acquisition: Stahlgruber 0.06 0.02 — Rhiag — — (0.00 ) PGW (1), (3) — — 0.02 Other acquisitions 0.00 0.05 0.06 Acquisition related expenses, net of tax (4) 0.05 0.03 0.04 Impact of share issuance from acquisition of Stahlgruber (0.02 ) (0.04 ) — Pro forma earnings per share from continuing operations, basic (5) 1.64 1.79 1.61 Less: Pro forma net income attributable to noncontrolling interest 0.01 0.00 — Pro forma income from continuing operations attributable to LKQ stockholders $ 1.63 $ 1.79 $ 1.61 Earnings per share from continuing operations, diluted - as reported $ 1.54 $ 1.73 $ 1.47 Effect of purchased businesses for the period prior to acquisition: Stahlgruber 0.05 0.02 — Rhiag — — (0.00 ) PGW (1), (3) — — 0.02 Other acquisitions 0.00 0.05 0.06 Acquisition related expenses, net of tax (4) 0.05 0.03 0.04 Impact of share issuance from acquisition of Stahlgruber (0.02 ) (0.04 ) — Pro forma earnings per share from continuing operations, diluted (5) 1.63 1.78 1.60 Less: Pro forma net income attributable to noncontrolling interest 0.01 0.00 — Pro forma income from continuing operations attributable to LKQ stockholders $ 1.62 $ 1.78 $ 1.60 (1) PGW reflects the results for the continuing aftermarket automotive glass distribution business only. (2) Includes interest expense for the period from April 9, 2018 through December 31, 2018 recorded on the senior notes issued in connection with our acquisition of Stahlgruber. (3) Excludes $5 million of corporate costs for 2016 that did not reoccur after the sale of our glass manufacturing business. (4) Includes expenses related to acquisitions closed in the period and excludes expenses for acquisitions not yet completed. (5) The sum of the individual earnings per share amounts may not equal the total due to rounding. Unaudited pro forma supplemental information is based upon accounting estimates and judgments that we believe are reasonable. The unaudited pro forma supplemental information includes the effect of purchase accounting adjustments, such as the adjustment of inventory acquired to fair value, adjustments to depreciation on acquired property, plant and equipment, adjustments to rent expense for above or below market leases, adjustments to amortization on acquired intangible assets, adjustments to interest expense, and the related tax effects. The pro forma impact of our acquisitions also reflects the elimination of acquisition related expenses, net of tax. Refer to Note 6, "Restructuring and Acquisition Related Expenses," for further information regarding our acquisition related expenses. The pro forma information also includes the impact of the common stock issued to Stahlgruber as if it were issued on January 1, 2017. These pro forma results are not necessarily indicative of what would have occurred if the acquisitions had been in effect for the periods presented or of future results.

Discontinued Operations (Notes)

Discontinued Operations (Notes)	12 Months Ended
	Dec. 31, 2018
Discontinued Operations [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	Discontinued Operations On March 1, 2017 , LKQ completed the sale of the glass manufacturing business of its PGW subsidiary to a subsidiary of Vitro S.A.B. de C.V. ("Vitro") for a sales price of $301 million , including cash received of $316 million , net of cash disposed of $15 million . Related to this transaction, the remaining portion of the Glass operating segment was combined with our Wholesale - North America operating segment, which is part of our North America reportable segment, in the first quarter of 2017. See Note 16, "Segment and Geographic Information " for further information regarding our segments. Upon execution of the Stock and Asset Purchase Agreement (the "Vitro Agreement") in December 2016, LKQ concluded that the glass manufacturing business met the criteria to be classified as held for sale in LKQ’s consolidated financial statements. As a result, the assets related to the glass manufacturing business were reflected on the Consolidated Balance Sheet at the lower of the net asset carrying value or fair value less cost to sell as of December 31, 2016. The fair value of the assets was determined using the negotiated sale price as an indicator of fair value, which is considered a Level 2 input as it is observable in a non-active market. See Note 12, "Fair Value Measurements" for further information regarding the tiers in the fair value hierarchy. In connection with the Vitro Agreement, the Company and Vitro entered into a twelve-month Transition Services Agreement commencing on the transaction date with two six-month renewal periods, a three-year Purchase and Supply Agreement, and an Intellectual Property Agreement. The following table summarizes the operating results of the Company’s discontinued operations related to the sale described above for the years ended December 31, 2018, 2017 and 2016, as presented in Net (loss) income from discontinued operations on the Consolidated Statements of Income (in thousands): Year Ended December 31, 2018 2017 2016 Revenue $ — $ 111,130 $ 498,233 Cost of goods sold — 100,084 424,161 Selling, general and administrative expenses — 8,369 22,330 Impairment on net assets of discontinued operations (1) — — 26,677 Operating income — 2,677 25,065 Interest income and other income (expense), net (2) — 1,204 (9,136 ) Income from discontinued operations before taxes — 3,881 15,929 Provision for income taxes — 3,598 8,252 Equity in (loss) earnings of unconsolidated subsidiaries — (534 ) 175 (Loss) income from discontinued operations, net of tax — (251 ) 7,852 Loss on sale of discontinued operations, net of tax (3) (4,397 ) (6,495 ) — Net (loss) income from discontinued operations $ (4,397 ) $ (6,746 ) $ 7,852 (1) Upon recognition of the glass manufacturing business net assets as held for sale, an impairment test was performed on the net assets of the glass manufacturing business resulting in a pre-tax impairment loss of $27 million and a tax benefit of $7 million . The impairment represents a $21 million impairment on long-lived assets, with the remaining $6 million representing a valuation allowance on the current assets held for sale. (2) The Company elected to allocate interest expense to discontinued operations based on the expected debt to be repaid. Under this approach, allocated interest from January 1, 2017 through the date of sale was $2 million and from April 21, 2016 to December 31, 2016 was $6 million . The other expenses, net were foreign currency gains and losses. (3) In the first quarter of 2017, upon closing of the sale and write-off of the net assets of the glass manufacturing business, we recorded a pre-tax loss on sale of $9 million , and a $4 million tax benefit. The incremental loss primarily reflects a $6 million payable for intercompany sales from the glass manufacturing business to the aftermarket automotive glass distribution business incurred prior to closing, which was paid by LKQ during the second quarter of 2017, and capital expenditures in 2017 that were not reimbursed by the buyer. During the fourth quarter of 2017, we recorded an additional loss on sale of $2 million as a result of post sale net working capital adjustments. During the fourth quarter of 2018, we recorded a final tax expense adjustment of $4 million to the loss on sale as a result of the completion of the tax return reporting the 2017 transaction. The adjustment was primarily attributable to a valuation allowance recognized on the carryforward of a capital loss arising from the sale, the tax benefit of which is not certain to be realized during the carryforward period. The glass manufacturing business had $4 million of operating cash outflows, $4 million of investing cash outflows mainly consisting of capital expenditures, and $15 million of financing cash inflows made up of parent financing for the period from January 1, 2017 through March 1, 2017. The glass manufacturing business had $64 million of operating cash inflows, $29 million of investing cash outflows mainly consisting of capital expenditures, and $1 million of financing cash outflows made up of capital lease debt payments for the period from April 21, 2016 through December 31, 2016. The following table summarizes the significant non-cash operating activities, capital expenditures, and investments in unconsolidated subsidiaries of the Company's discontinued operations related to the glass manufacturing business (in thousands): Period from January 1 Period from April 21 to March 1, to December 31, 2017 2016 Non-cash operating activities: Depreciation and amortization $ — $ 7,752 Impairment of net assets of discontinued operations — 26,677 Deferred income taxes — (4,516 ) Capital expenditures (3,598 ) (24,156 ) Investments in unconsolidated subsidiaries — (4,400 ) Pursuant to the Purchase and Supply Agreement , our aftermarket automotive glass distribution business will source various products from Vitro's glass manufacturing business annually for a three-year period beginning on March 1, 2017. Between January 1, 2017 and the sale date of March 1, 2017, intercompany sales between the glass manufacturing business and the continuing aftermarket automotive glass distribution business of PGW, which were eliminated in consolidation, were $8 million . All purchases from Vitro, including those outside of the Purchase and Supply Agreement, for the years ended December 31, 2018 and 2017 , were $24 million and $42 million , respectively. For the period from April 21, 2016 through December 31, 2016, intercompany sales between the glass manufacturing business and PGW autoglass, which were eliminated in consolidation, were $29 million .

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment Property, plant and equipment are recorded at cost less accumulated depreciation. Expenditures for major additions and improvements that extend the useful life of the related asset are capitalized. As property, plant and equipment are sold or retired, the applicable cost and accumulated depreciation are removed from the accounts and any resulting gain or loss thereon is recognized. Construction in progress consists primarily of building and land improvements at our existing facilities. Depreciation is calculated using the straight-line method over the estimated useful lives or, in the case of leasehold improvements, the term of the related lease and reasonably assured renewal periods, if shorter. Our estimated useful lives are as follows: Land improvements 10-20 years Buildings and improvements 20-40 years Machinery and equipment 3-20 years Computer equipment and software 3-10 years Vehicles and trailers 3-10 years Furniture and fixtures 5-7 years Property, plant and equipment consists of the following (in thousands): December 31, 2018 2017 Land and improvements $ 177,998 $ 137,790 Buildings and improvements 378,490 233,078 Machinery and equipment 626,615 521,526 Computer equipment and software 143,547 133,753 Vehicles and trailers 176,186 161,269 Furniture and fixtures 58,919 31,794 Leasehold improvements 278,687 257,506 1,840,442 1,476,716 Less—Accumulated depreciation (685,751 ) (606,112 ) Construction in progress 65,471 42,485 Total property, plant and equipment, net $ 1,220,162 $ 913,089 The components of opening property, plant and equipment acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands): Gross Amount Land and improvements $ 47,281 Buildings and improvements 135,628 Machinery and equipment 49,384 Computer equipment and software 3,760 Vehicles and trailers 643 Furniture and fixtures 30,426 Leasehold improvements 1,890 269,012 Construction in progress 2,280 Total property, plant and equipment $ 271,292 We record depreciation expense associated with our refurbishing, remanufacturing, manufacturing and furnace operations as well as our distribution centers in Cost of goods sold on the Consolidated Statements of Income. All other depreciation expense is reported in Depreciation and amortization. Total depreciation expense for the years ended December 31, 2018, 2017, and 2016 was $157 million , $129 million , and $115 million , respectively.
Inventory	Inventories We classify our inventory into the following categories: (i) aftermarket and refurbished products, (ii) salvage and remanufactured products, and (iii) manufactured products. An aftermarket product is a new vehicle product manufactured by a company other than the original equipment manufacturer. For all of our aftermarket products, excluding our aftermarket automotive glass products, cost is established based on the average price we pay for parts; for our aftermarket automotive glass products inventory, cost is established using the first-in first-out method. Inventory cost for all of our aftermarket products includes expenses incurred for freight in and overhead costs; for items purchased from foreign companies, import fees and duties and transportation insurance are also included. Refurbished products are parts that require cosmetic repairs, such as wheels, bumper covers and lights; LKQ will apply new parts, products or materials to these parts in order to produce the finished product. Refurbished inventory cost is based upon the average price we pay for cores. The cost of our refurbished inventory also includes expenses incurred for freight in, labor and other overhead costs. A salvage product is a recycled vehicle part suitable for sale as a replacement part. Cost is established based upon the price we pay for a vehicle, including auction, storage and towing fees, as well as expenditures for buying and dismantling the vehicle. Inventory carrying value is determined using the average cost to sales percentage at each of our facilities and applying that percentage to the facility's inventory at expected selling prices, the assessment of which incorporates the sales probability based on a part's number of days in stock and historical demand. The average cost to sales percentage is derived from each facility's historical profitability for salvage vehicles. Remanufactured products are used parts that have been inspected, rebuilt, or reconditioned to restore functionality and performance, such as remanufactured engines and transmissions. Remanufactured inventory cost is based upon the price paid for cores, which are recycled automotive parts that are not suitable for sale as a replacement part without further processing, and also includes expenses incurred for freight in, direct manufacturing costs and other overhead costs. A manufactured product is a new vehicle product. Manufactured product inventory can be a raw material, work-in-process or finished good. Cost is established using the first-in first-out method. For all inventory, carrying value is recorded at the lower of cost or net realizable value and is reduced to reflect current anticipated demand. If actual demand is lower than our estimates, additional reductions to inventory carrying value would be necessary in the period such determination is made. Inventories consist of the following (in thousands): December 31, 2018 2017 Aftermarket and refurbished products $ 2,309,458 $ 1,877,653 Salvage and remanufactured products 503,199 487,108 Manufactured products 23,418 16,022 Total inventories $ 2,836,075 $ 2,380,783 Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of December 31, 2018, manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $4 million of finished goods. As of December 31, 2017, manufactured products inventory was composed of $10 million of raw materials, $2 million of work in process, and $4 million of finished goods. Our May 2018 acquisition of Stahlgruber contributed $380 million to our aftermarket and refurbished products inventory as of the acquisition date. See Note 2, "Business Combinations" for further information on our acquisitions.
Receivables, Policy [Policy Text Block]	Receivables and Allowance for Doubtful Accounts In the normal course of business, we extend credit to customers after a review of each customer's credit history. We recorded a reserve for uncollectible accounts of approximately $57 million and $58 million at December 31, 2018 and 2017 , respectively. Our May 2018 acquisition of Stahlgruber contributed $3 million to our reserve for uncollectible accounts. See Note 2, "Business Combinations" for further information on our acquisitions. The reserve is based upon the aging of the accounts receivable, our assessment of the collectability of specific customer accounts and historical experience. Receivables are written off once collection efforts have been exhausted. Recoveries of receivables previously written off are recorded when received.
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Principles of Consolidation The accompanying consolidated financial statements include the accounts of LKQ Corporation and its subsidiaries. All intercompany transactions and accounts have been eliminated. Use of Estimates In preparing our financial statements in conformity with accounting principles generally accepted in the United States of America, we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates. Revenue Recognition See Note 5, "Revenue Recognition" for our accounting policies related to revenue. Cost of Goods Sold Our cost of goods sold includes: the price we pay for inventory, net of vendor discounts, rebates or other incentives; inbound freight and other transportation costs to bring inventory into our facilities; and overhead costs related to purchasing, warehousing and transporting our products from our distribution warehouses to our selling locations. For our salvage, remanufactured, and refurbished products, our cost of goods sold also includes direct and indirect labor, equipment costs, depreciation, and other overhead to transform inventory into finished products suitable for sale. Cost of goods sold also includes expenses for our service-type warranties and for our assurance-type warranty programs. See Note 5, "Revenue Recognition" for additional information related to our warranty programs. Selling, General and Administrative Expenses Selling, general and administrative expenses include: personnel costs for employees in selling, general and administrative functions; costs to operate our branch locations, corporate offices and back office support centers; costs to transport our products from our facilities to our customers; and other selling, general and administrative expenses, such as professional fees, supplies, and advertising expenses. The costs included in selling, general and administrative expenses do not relate to inventory processing or conversion activities, and, as such, are classified below the gross margin line on our Consolidated Statements of Income. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents include cash on hand, operating accounts, and deposits readily convertible to known amounts of cash. Restricted cash includes cash for which the Company's ability to withdraw funds at any time is contractually limited. As of December 31, 2018, we have $5 million of restricted cash that is recorded in Other assets on the Consolidated Balance Sheets. Receivables and Allowance for Doubtful Accounts In the normal course of business, we extend credit to customers after a review of each customer's credit history. We recorded a reserve for uncollectible accounts of approximately $57 million and $58 million at December 31, 2018 and 2017 , respectively. Our May 2018 acquisition of Stahlgruber contributed $3 million to our reserve for uncollectible accounts. See Note 2, "Business Combinations" for further information on our acquisitions. The reserve is based upon the aging of the accounts receivable, our assessment of the collectability of specific customer accounts and historical experience. Receivables are written off once collection efforts have been exhausted. Recoveries of receivables previously written off are recorded when received. Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentration of credit risk consist primarily of cash and cash equivalents and accounts receivable. We control our exposure to credit risk associated with these instruments by (i) placing our cash and cash equivalents with several major financial institutions; (ii) holding high-quality financial instruments; and (iii) maintaining strict policies over credit extension that include credit evaluations, credit limits and monitoring procedures. In addition, our overall credit risk with respect to accounts receivable is limited to some extent because our customer base is composed of a large number of geographically diverse customers. Inventories We classify our inventory into the following categories: (i) aftermarket and refurbished products, (ii) salvage and remanufactured products, and (iii) manufactured products. An aftermarket product is a new vehicle product manufactured by a company other than the original equipment manufacturer. For all of our aftermarket products, excluding our aftermarket automotive glass products, cost is established based on the average price we pay for parts; for our aftermarket automotive glass products inventory, cost is established using the first-in first-out method. Inventory cost for all of our aftermarket products includes expenses incurred for freight in and overhead costs; for items purchased from foreign companies, import fees and duties and transportation insurance are also included. Refurbished products are parts that require cosmetic repairs, such as wheels, bumper covers and lights; LKQ will apply new parts, products or materials to these parts in order to produce the finished product. Refurbished inventory cost is based upon the average price we pay for cores. The cost of our refurbished inventory also includes expenses incurred for freight in, labor and other overhead costs. A salvage product is a recycled vehicle part suitable for sale as a replacement part. Cost is established based upon the price we pay for a vehicle, including auction, storage and towing fees, as well as expenditures for buying and dismantling the vehicle. Inventory carrying value is determined using the average cost to sales percentage at each of our facilities and applying that percentage to the facility's inventory at expected selling prices, the assessment of which incorporates the sales probability based on a part's number of days in stock and historical demand. The average cost to sales percentage is derived from each facility's historical profitability for salvage vehicles. Remanufactured products are used parts that have been inspected, rebuilt, or reconditioned to restore functionality and performance, such as remanufactured engines and transmissions. Remanufactured inventory cost is based upon the price paid for cores, which are recycled automotive parts that are not suitable for sale as a replacement part without further processing, and also includes expenses incurred for freight in, direct manufacturing costs and other overhead costs. A manufactured product is a new vehicle product. Manufactured product inventory can be a raw material, work-in-process or finished good. Cost is established using the first-in first-out method. For all inventory, carrying value is recorded at the lower of cost or net realizable value and is reduced to reflect current anticipated demand. If actual demand is lower than our estimates, additional reductions to inventory carrying value would be necessary in the period such determination is made. Inventories consist of the following (in thousands): December 31, 2018 2017 Aftermarket and refurbished products $ 2,309,458 $ 1,877,653 Salvage and remanufactured products 503,199 487,108 Manufactured products 23,418 16,022 Total inventories $ 2,836,075 $ 2,380,783 Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of December 31, 2018, manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $4 million of finished goods. As of December 31, 2017, manufactured products inventory was composed of $10 million of raw materials, $2 million of work in process, and $4 million of finished goods. Our May 2018 acquisition of Stahlgruber contributed $380 million to our aftermarket and refurbished products inventory as of the acquisition date. See Note 2, "Business Combinations" for further information on our acquisitions. Property, Plant and Equipment Property, plant and equipment are recorded at cost less accumulated depreciation. Expenditures for major additions and improvements that extend the useful life of the related asset are capitalized. As property, plant and equipment are sold or retired, the applicable cost and accumulated depreciation are removed from the accounts and any resulting gain or loss thereon is recognized. Construction in progress consists primarily of building and land improvements at our existing facilities. Depreciation is calculated using the straight-line method over the estimated useful lives or, in the case of leasehold improvements, the term of the related lease and reasonably assured renewal periods, if shorter. Our estimated useful lives are as follows: Land improvements 10-20 years Buildings and improvements 20-40 years Machinery and equipment 3-20 years Computer equipment and software 3-10 years Vehicles and trailers 3-10 years Furniture and fixtures 5-7 years Property, plant and equipment consists of the following (in thousands): December 31, 2018 2017 Land and improvements $ 177,998 $ 137,790 Buildings and improvements 378,490 233,078 Machinery and equipment 626,615 521,526 Computer equipment and software 143,547 133,753 Vehicles and trailers 176,186 161,269 Furniture and fixtures 58,919 31,794 Leasehold improvements 278,687 257,506 1,840,442 1,476,716 Less—Accumulated depreciation (685,751 ) (606,112 ) Construction in progress 65,471 42,485 Total property, plant and equipment, net $ 1,220,162 $ 913,089 The components of opening property, plant and equipment acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands): Gross Amount Land and improvements $ 47,281 Buildings and improvements 135,628 Machinery and equipment 49,384 Computer equipment and software 3,760 Vehicles and trailers 643 Furniture and fixtures 30,426 Leasehold improvements 1,890 269,012 Construction in progress 2,280 Total property, plant and equipment $ 271,292 We record depreciation expense associated with our refurbishing, remanufacturing, manufacturing and furnace operations as well as our distribution centers in Cost of goods sold on the Consolidated Statements of Income. All other depreciation expense is reported in Depreciation and amortization. Total depreciation expense for the years ended December 31, 2018, 2017, and 2016 was $157 million , $129 million , and $115 million , respectively. Intangible Assets Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete. Goodwill is tested for impairment at least annually, and we performed annual impairment tests during the fourth quarters of 2018 , 2017 and 2016 . Goodwill impairment testing may also be performed on an interim basis when events or circumstances arise that may lead to impairment. The fair value estimates of our reporting units are established using weightings of the results of a discounted cash flow methodology and a comparative market multiples approach. Based on our annual goodwill impairment test in the fourth quarter of 2018, we determined the carrying value of our Aviation reporting unit exceeded the fair value estimate by more than the carrying value, thus we recorded an impairment charge of $33 million , which represented the total carrying value of goodwill in our Aviation reporting unit. The impairment charge was due to a decrease in the fair value estimate from the prior year fair value estimate, primarily driven by a significant deterioration in the outlook for the Aviation reporting unit due to competition, customer financial issues and changing market conditions for the airplane platforms that the business services, which lowered our projected gross margin and related future cash flows. We reported the impairment charge in Impairment of goodwill on the Consolidated Statements of Income for the year ended December 31, 2018. We determined no other impairments existed when we performed our annual impairment testing on the remaining reporting units as all those reporting units had a fair value estimate which exceeded the carrying value by at least approximately 15% , the level at which our Europe reporting unit exceeded its carrying value. The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands): North America Europe Specialty Total Balance as of January 1, 2016 $ 1,433,499 $ 594,482 $ 291,265 $ 2,319,246 Business acquisitions and adjustments to previously recorded goodwill 226,483 614,437 1,889 842,809 Exchange rate effects 1,818 (108,943 ) (161 ) (107,286 ) Balance as of December 31, 2016 $ 1,661,800 $ 1,099,976 $ 292,993 $ 3,054,769 Business acquisitions and adjustments to previously recorded goodwill 39,836 155,366 119,615 314,817 Exchange rate effects 7,718 159,556 (349 ) 166,925 Balance as of December 31, 2017 $ 1,709,354 $ 1,414,898 $ 412,259 $ 3,536,511 Business acquisitions and adjustments to previously recorded goodwill 6,805 970,923 (4,838 ) 972,890 Impairment of goodwill (33,244 ) — — (33,244 ) Exchange rate effects (9,383 ) (85,532 ) 216 (94,699 ) Balance as of December 31, 2018 $ 1,673,532 $ 2,300,289 $ 407,637 $ 4,381,458 Accumulated impairment losses as of December 31, 2018 $ (33,244 ) $ — $ — $ (33,244 ) During the year ended December 31, 2018, we recorded $908 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions. The components of other intangibles, net are as follows (in thousands): December 31, 2018 December 31, 2017 Intangible assets subject to amortization $ 847,452 $ 664,969 Indefinite-lived intangible assets Trademarks 81,300 78,800 Total $ 928,752 $ 743,769 The components of intangible assets subject to amortization are as follows (in thousands): December 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trade names and trademarks $ 496,166 $ (94,451 ) $ 401,715 $ 327,332 $ (75,095 ) $ 252,237 Customer and supplier relationships 593,517 (247,464 ) 346,053 510,113 (167,532 ) 342,581 Software and other technology related assets 176,118 (79,283 ) 96,835 124,049 (59,081 ) 64,968 Covenants not to compete 13,344 (10,495 ) 2,849 14,981 (9,798 ) 5,183 Total $ 1,279,145 $ (431,693 ) $ 847,452 $ 976,475 $ (311,506 ) $ 664,969 The components of intangible assets acquired as part of our acquisitions in 2018 are as follows (in thousands): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions (1) Total All Acquisitions Trade names and trademarks $ 173,946 $ 8,870 $ 182,816 $ 87,306 Customer and supplier relationships 77,980 20,779 98,759 75,450 Software and other technology related assets 33,329 376 33,705 15,757 Covenants not to compete — — — 2,703 Total $ 285,255 $ 30,025 $ 315,280 $ 181,216 (1) The amounts recorded during the year ended December 31, 2018 exclude amounts related to our 2017 acquisitions, including a $5 million adjustment to increase other intangibles related to our 2017 acquisition of Warn. The weighted-average amortization periods for our intangible assets acquired during the years ended December 31, 2018 and 2017 are as follows (in years): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions Total All Acquisitions Trade names and trademarks 18.0 10.0 17.6 11.2 Customer and supplier relationships 3.0 7.9 4.0 18.6 Software and other technology related assets 5.2 6.5 5.2 11.1 Covenants not to compete — — — 4.4 Total acquired finite-lived intangible assets 12.4 8.5 12.0 16.5 Our estimated useful lives for our finite-lived intangible assets are as follows: Method of Amortization Useful Life Trade names and trademarks Straight-line 4-30 years Customer and supplier relationships Accelerated 3-20 years Software and other technology related assets Straight-line 3-15 years Covenants not to compete Straight-line 2-5 years Amortization expense for intangibles was $137 million , $102 million , and $83 million during the years ended December 31, 2018 , 2017 , and 2016 , respectively. Estimated amortization expense for each of the five years in the period ending December 31, 2023 is $140 million , $110 million , $80 million , $66 million and $59 million , respectively. Impairment of Long-Lived Assets Long-lived assets are reviewed for possible impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable. If such review indicates that the carrying amount of long-lived assets is not recoverable, the carrying amount of such assets is reduced to fair value. Other than the impairment recorded upon recognition of the PGW glass manufacturing business net assets as held for sale as discussed in Note 3, "Discontinued Operations ," there were no material adjustments to the carrying value of long-lived assets during the years ended December 31, 2018 , 2017 or 2016 . Investments in Unconsolidated Subsidiaries Our investment in unconsolidated subsidiaries was $179 million and $208 million as of December 31, 2018 and December 31, 2017, respectively. On December 1, 2016 , we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million . Headquartered in Stockholm, Sweden, Mekonomen is a leading independent car parts and service chain in northern Europe, offering a range of products including spare parts and accessories for cars, and workshop services for consumers and businesses. As a result of the investment, we nominated two representatives for election to Mekonomen's board of directors; both representatives were subsequently elected to and continue to serve on the board of directors, including one as the chairman of the board. We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of December 31, 2018, the book value of our investment in Mekonomen exceeded our share of the book value of Mekonomen's net assets by $85 million ; this difference is primarily related to goodwill and the fair value of other intangible assets. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded equity losses of $64 million during the year ended December 31, 2018, and equity in earnings of $7 million during the year ended December 31, 2017 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments. In May 2018 and May 2017, we received cash dividends of $8 million (SEK 67 million ) and $7 million (SEK 67 million ), respectively, related to our investment in Mekonomen. Mekonomen announced in February 2019 that the Mekonomen Board of Directors has proposed no dividend payments in 2019. On July 6, 2018, Mekonomen announced the acquisition of two automotive spare parts distributors in Denmark and Poland. The objective of the acquisition was to strengthen Mekonomen's position in the sale of automotive spare parts in northern Europe and to establish a strong market position in Denmark and Poland, where Mekonomen previously had no operations. The acquisition was partially financed by a rights issue with preferential rights for Mekonomen's existing shareholders, who were given the right to subscribe for four new Mekonomen shares per seven existing owned shares at a discounted share price. On October 5, 2018, we subscribed for our pro rata share in the rights issue giving us the right to acquire an additional $48 million of equity in Mekonomen at a discounted share price, increasing our equity interest to 26.6% . During the third quarter of 2018, we recorded a derivative instrument of $29 million in Other assets on our Consolidated Balance Sheets, which represented our right to acquire Mekonomen shares at a discount. In the third quarter of 2018, we measured the derivative instrument at fair value, and we recorded a $3 million gain on our fair value remeasurement. We acquired the additional $48 million of equity in Mekonomen in October 2018. In the fourth quarter, we recorded an $8 million loss related to the settlement of the derivative instrument in October 2018 due to a decrease in the Mekonomen share price from the last day of the third quarter to the settlement date. The net derivative loss of $5 million is recorded in Interest income and other income, net on the Consolidated Statements of Income. We evaluated our investment in Mekonomen for other-than-temporary impairment as of December 31, 2018, and concluded the decline in fair value was other-than-temporary due to a significant stock price decrease since September 30, 2018. Therefore, we recognized an other-than-temporary impairment of $48 million , which represented the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price of SEK 92 as of December 31, 2018. During the third quarter of 2018, we had recognized an other-than-temporary impairment of $23 million due to a prolonged and significant stock price decrease; the fair value was determined using the Mekonomen share price of SEK 126 as of September 30, 2018. The impairment charges are recorded in Equity in (losses) earnings of unconsolidated subsidiaries in our Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge in the fourth quarter, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at December 31, 2018 approximated the carrying value of $154 million . From year-end to February 22, 2019, the Mekonomen share price declined to SEK 69 , or 24.9% relative to the December 31, 2018 share price. This further decrease creates the potential for an additional other-than-temporary impairment charge in 2019. Warranty Reserve Some of our salvage mechanical products are sold with a standard six month warranty against defects. Additionally, some of our remanufactured engines are sold with a standard three year warranty against defects. We also provide a limited lifetime warranty for certain of our aftermarket products. These assurance-type warranties are not considered a separate performance obligation, and thus no transaction price is allocated to them. We record the warranty costs in Cost of goods sold on our Consolidated Statements of Income. Our warranty reserve is calculated using historical claim information to project future warranty claims activity and is recorded within Other accrued expenses and Other noncurrent liabilities on our Consolidated Balance Sheets based on the expected timing of the related payments. The changes in the warranty reserve are as follows (in thousands): Balance as of January 1, 2017 $ 19,634 Warranty expense 38,608 Warranty claims (35,091 ) Balance as of December 31, 2017 23,151 Warranty expense 43,682 Warranty claims (43,571 ) Balance as of December 31, 2018 $ 23,262 Self-Insurance Reserves We self-insure a portion of employee medical benefits under the terms of our employee health insurance program. We purchase certain stop-loss insurance to limit our liability exposure. We also self-insure a portion of our property and casualty risk, which includes automobile liability, general liability, directors and officers liability, workers' compensation, and property coverage, under deductible insurance programs. The insurance premium costs are expensed over the contract periods. A reserve for liabilities associated with these losses is established for claims filed and claims incurred but not yet reported based upon our estimate of ultimate cost, which is calculated using analysis of historical data. We monitor new claims and claim development as well as trends related to the claims incurred but not reported in order to assess the adequacy of our insurance reserves. Total self-insurance reserves were $105 million and $94 million , of which $52 million and $43 million was classified as current, as of December 31, 2018 and 2017 , respectively, and are classified as Other accrued expenses in the Consolidated Balance Sheets. The remaining balances of self-insurance reserves are classified as Other noncurrent liabilities, which reflects management's estimates of when claims will be paid. We had outstanding letters of credit of $65 million and $71 million at December 31, 2018 and 2017 , respectively, to guarantee self-insurance claims payments. While we do not expect the amounts ultimately paid to differ significantly from our estimates, our insurance reserves and corresponding expenses could be affected if future claims experience differs significantly from historical trends and assumptions. Stockholders' Equity On October 25, 2018, our Board of Directors authorized a stock repurchase program under which we may purchase up to $500 million of our common stock from time to time through October 25, 2021. Repurchases under the program may be made in the open market or in privately negotiated transactions, with the amount and timing of repurchases depending on market conditions and corporate needs. The repurchase program does not obligate us to acquire any specific number of shares and may be suspended or discontinued at any time. Delaware law imposes restrictions on stock repurchases. During 2018, we repurchased 2.3 million shares of common stock for an aggregate price $60 million . As of December 31, 2018, there is $440 million of remaining capacity under our repurchase program. In 2019, we have repurchased 1.8 million shares of common stock for an aggregate purchase price of $46 million during the period ended February 22, 2019. Treasury stock is accounted for using the cost method. Income Taxes Current income taxes are provided on income reported for financial reporting purposes, adjusted for transactions that do not enter into the computation of income taxes payable in the same year. Deferred income taxes have been provided to show the effect of temporary differences between the tax bases of assets and liabilities and their reported amounts in the financial statements. A valuation allowance is provided for deferred tax assets if it is more likely than not that these items will either expire before we are able to realize their benefit or that future deductibility is uncertain. Provision is made for taxes on undistributed earnings of foreign subsidiaries and related companies to the extent that such earnings are not deemed to be permanently invested. We recognize the benefits of uncertain tax positions taken or expected to be taken in tax returns in the provision for income taxes only for those positions that are more likely than not to be realized. We follow a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. We consider many factors when evaluating and estimating our tax positions and tax benefits, which may require periodic adjustments and which may not accurately forecast actual outcomes. Our policy is to include interest and penalties associated with income tax obligations in income tax expense. During 2017, new tax legislation was signed into law making significant changes to the Internal Revenue Code. See Note 15, "Income Taxes" for further information regarding the new tax law. Rental Expense We recognize rental expense on a straight-line basis over the respective lease terms, including reasonably assured renewal periods, for all of our operating leases. Foreign Currency Translation For most of our foreign operations, the local currency is the functional currency. Assets and liabilities are translated into U.S. dollars at the period-ending exchange rate. Statements of Income amounts are translated to U.S. dollars using monthly average exchange rates during the period. Translation gains and losses are reported as a component of Accumulated other comprehensive income (loss) in stockholders' equity. Recent Accounting Pronouncements Adoption of New Revenue Standard In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2014-09. This update outlines a new comprehensive revenue recognition model that supersedes the prior revenue recognition guidance and requires companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued several updates to ASU 2014-09, which collectively with ASU 2014-09, represent the FASB Accounting Standards Codification Topic 606 (“ASC 606”). On January 1, 2018, we adopted ASC 606 for all contracts using the modified retrospective method, which means the historical periods are presented under the previous revenue standards with the cumulative net income effect being adjusted through retained earnings. Most of the changes resulting from our adoption of ASC 606 were changes in presentation within the Consolidated Balance Sheets and the Consolidated Statements of Income. Therefore, while we made adjustments to certain opening balances on our January 1, 2018 balance sheet, we made no adjustments to opening retained earnings. We expect the impact of the adoption of ASC 606 to be immaterial to our net income on an ongoing basis. See Note 5, "Revenue Recognition" for the required disclosures under ASC 606. With the adoption of ASC 606, we reclassified certain amounts related to variable consideration. Under ASC 606, we are required to present a refund liability and a returns asset within the Consolidated Balance Sheet, whereas in periods prior to adoption, we presented the estimated margin impact of expected returns as a contra-asset within accounts receivable. Additionally, under ASC 606, the changes in the refund liability are reported in revenue, and the changes in the returns assets are reported in Cost of goods sold on the Consolidated Statements of Income. Prior to adoption, the change in the reserve for returns was generally reported as a net amount within revenue. As a result, the income statement presentation was adjusted concurrently with the balance sheet change beginning in 2018. The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands): Balance as of December 31, 2017 Adjustments Due to ASC 606 Balance as of January 1, 2018 Balance Sheet Assets Accounts receivable $ 1,027,106 $ 38,511 $ 1,065,617 Prepaid expenses and other current assets 134,479 44,508 178,987 Liabilities Refund liability — 83,019 83,019 The impact of the adoption of ASC 606 on our Consolidated Balance Sheet as of December 31, 2018 and our Consolidated Statements of Income for the year ended December 31, 2018 was as follows (in thousands): Balance as of December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Balance Sheet Assets Accounts receivable $ 1,154,083 $ 1,105,937 $ 48,146 Prepaid expenses and other current assets 199,030 142,591 56,439 Liabilities Refund liability 104,585 — 104,585 Year ended December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Income Statement Revenue $ 11,876,674 $ 11,884,651 $ (7,977 ) Cost of goods sold 7,301,817 7,306,885 (5,068 ) Selling, general and administrative expenses 3,352,731 3,355,640 (2,909 ) We have not included a table of the impact of the balance sheet adjustments on the Consolidated Statement of Cash Flows as the adjustment will net to zero within the operating activities section of this statement. Under ASC 606, we have elected not to adjust consideration for the effect of a significant financing c
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adoption of New Revenue Standard In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2014-09. This update outlines a new comprehensive revenue recognition model that supersedes the prior revenue recognition guidance and requires companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued several updates to ASU 2014-09, which collectively with ASU 2014-09, represent the FASB Accounting Standards Codification Topic 606 (“ASC 606”). On January 1, 2018, we adopted ASC 606 for all contracts using the modified retrospective method, which means the historical periods are presented under the previous revenue standards with the cumulative net income effect being adjusted through retained earnings. Most of the changes resulting from our adoption of ASC 606 were changes in presentation within the Consolidated Balance Sheets and the Consolidated Statements of Income. Therefore, while we made adjustments to certain opening balances on our January 1, 2018 balance sheet, we made no adjustments to opening retained earnings. We expect the impact of the adoption of ASC 606 to be immaterial to our net income on an ongoing basis. See Note 5, "Revenue Recognition" for the required disclosures under ASC 606. With the adoption of ASC 606, we reclassified certain amounts related to variable consideration. Under ASC 606, we are required to present a refund liability and a returns asset within the Consolidated Balance Sheet, whereas in periods prior to adoption, we presented the estimated margin impact of expected returns as a contra-asset within accounts receivable. Additionally, under ASC 606, the changes in the refund liability are reported in revenue, and the changes in the returns assets are reported in Cost of goods sold on the Consolidated Statements of Income. Prior to adoption, the change in the reserve for returns was generally reported as a net amount within revenue. As a result, the income statement presentation was adjusted concurrently with the balance sheet change beginning in 2018. The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands): Balance as of December 31, 2017 Adjustments Due to ASC 606 Balance as of January 1, 2018 Balance Sheet Assets Accounts receivable $ 1,027,106 $ 38,511 $ 1,065,617 Prepaid expenses and other current assets 134,479 44,508 178,987 Liabilities Refund liability — 83,019 83,019 The impact of the adoption of ASC 606 on our Consolidated Balance Sheet as of December 31, 2018 and our Consolidated Statements of Income for the year ended December 31, 2018 was as follows (in thousands): Balance as of December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Balance Sheet Assets Accounts receivable $ 1,154,083 $ 1,105,937 $ 48,146 Prepaid expenses and other current assets 199,030 142,591 56,439 Liabilities Refund liability 104,585 — 104,585 Year ended December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Income Statement Revenue $ 11,876,674 $ 11,884,651 $ (7,977 ) Cost of goods sold 7,301,817 7,306,885 (5,068 ) Selling, general and administrative expenses 3,352,731 3,355,640 (2,909 ) We have not included a table of the impact of the balance sheet adjustments on the Consolidated Statement of Cash Flows as the adjustment will net to zero within the operating activities section of this statement. Under ASC 606, we have elected not to adjust consideration for the effect of a significant financing component at contract inception if the period between the transfer of goods to the customer and payment received from the customer is one year or less. Generally, our payment terms are short term in nature, but in some instances we may offer extended terms to customers exceeding one year such that interest would be accrued with respect to those contracts. The interest that would be accrued related to these contracts is immaterial at December 31, 2018. Other Recently Adopted Accounting Pronouncements During the first quarter of 2018, we adopted ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), which changes how entities will recognize, measure, present and make disclosures about certain financial assets and financial liabilities. The adoption of ASU 2016-01 did not have a significant impact on our financial position, results of operations, cash flows or disclosures. During the first quarter of 2018, we adopted ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments" ("ASU 2016-15"), which includes guidance on classification for the following items: debt prepayment or debt extinguishment costs, settlement of zero coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims and corporate-owned or bank-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and other separately identifiable cash flows where application of the predominance principle is prescribed. No adjustments were required in our Consolidated Statement of Cash Flows upon adoption. Within our Consolidating Statements of Cash Flows in Note 18, "Condensed Consolidating Financial Information ," we now present a new line item, Payments of deferred purchase price on receivables securitization, as a result of adopting ASU 2016-15; prior year cash flow information within this footnote has been recast to reflect the impact of adopting this accounting standard. Other than the addition of this new line item, there was no impact to our Consolidating Statements of Cash Flows upon adoption. During the first quarter of 2018, we adopted ASU No. 2016-18, "Restricted Cash" ("ASU 2016-18"), which requires an entity to include in its cash and cash equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents, and clarifies how these amounts should be presented therein. At the time we adopted this accounting standard in the first quarter of 2018, there was no impact to our Consolidated Statements of Cash Flows, as we did not have any restricted cash balances. We have restricted cash as of December 31, 2018 and therefore, the Consolidated Statements of Cash Flows have been updated to reflect this guidance. For more information on our restricted cash balances as of December 31, 2018, refer to the "Cash, Cash Equivalents and Restricted Cash" section of this footnote above. During the first quarter of 2018, we adopted ASU No. 2017-01, "Clarifying the Definition of a Business" (“ASU 2017-01”), which requires an entity to evaluate if substantially all of the fair value of assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the transaction does not qualify as a business. The guidance also requires an acquired business to include at least one substantive process and narrows the definition of outputs. The adoption of ASU 2017-01 did not have a material impact on our consolidated financial statements. During the first quarter of 2018, we adopted ASU No. 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"), which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the reduction of the U.S. federal statutory income tax rate to 21% from 35% due to the enactment of the Tax Cuts and Jobs Act of 2017 (the "Tax Act"). In addition, under ASU 2018-02, an entity is required to provide certain disclosures regarding stranded tax effects. ASU 2018-02 is effective for fiscal years and interim periods beginning after December 15, 2018; early adoption is permitted. As a result of the adoption of ASU 2018-02, we recorded a $5 million reclassification to increase Accumulated Other Comprehensive (Loss) Income and decrease Retained Earnings. During the first quarter of 2018, we adopted ASU No. 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" ("ASU 2017-07"), which requires presentation of the current service cost component of net periodic benefit expense with other current compensation expenses for the related employees, and requires presentation of the remaining components of net periodic benefit expense, such as interest, expected return on plan assets, and amortization of actuarial gains and losses, outside of operating income. ASU 2017-07 also specifies that, on a prospective basis, only the service cost component is eligible for capitalization into inventory or other assets. The income statement classification provisions of ASU 2017-07 are applicable on a retrospective basis, therefore we recast prior period income statement information for 2017; the recast had the impact of increasing Selling, general and administrative expenses for the year ended December 31, 2017 by $2 million , with a corresponding increase to Interest income and other income, net. The impact was immaterial to our Consolidated Statements of Income in 2016, thus we did not recast for 2016. The change in the capitalization provisions under ASU 2017-07 did not have a material impact on our consolidated financial statements. See Note 14, "Employee Benefit Plans," for further disclosure on the components of net periodic benefit expense and classification of the components within our Consolidated Statements of Income for the year ended December 31, 2018 , 2017 , and 2016. During 2018, the FASB issued ASU No. 2018-15, "Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15"). This update requires an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We adopted ASU 2018-15 in the third quarter of 2018 as we believe that our existing policy is consistent with the new guidance and thus no adjustments were required to be in compliance with this update. In August 2018, the FASB issued ASU No. 2018-14, "Disclosure Framework- Changes to the Disclosure Requirements for Defined Benefit Plans" ("ASU 2018-14"), which removes, modifies, and adds certain disclosure requirements to the ASC 715 (Compensation- Retirement Benefits) guidance. ASU 2018-14 is effective for fiscal years and interim periods beginning after December 15, 2020; early adoption is permitted. We early adopted ASU 2018-14 in the fourth quarter of 2018; the required disclosures are reflected in Note 14, "Employee Benefit Plans." Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, "Leases" ("ASU 2016-02"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The main difference between current GAAP and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current GAAP. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018. The standard requires that entities apply the effects of these changes using a modified retrospective approach, which includes a number of optional practical expedients. We will adopt the standard in the first quarter of 2019 and take advantage of the transition package of practical expedients permitted within the new standard, which, among other things, allows us to carryforward the historical lease classification. We will make an accounting policy election that will keep leases with an initial term of 12 months or less off of the balance sheet and will result in recognizing those lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. While we are continuing to assess all potential impacts of the standard, we expect total liabilities and leased assets to increase by $1.2 billion to $1.4 billion as of the date of adoption. The difference between these amounts primarily represents the existing deferred rent liabilities balance, resulting from the historical straight-line treatment of operating leases, which is reclassified as a reduction of the lease assets upon adoption. We do not believe the standard will materially affect our Statements of Income or Statements of Cash Flows as operating lease payments will still be an operating cash outflow and capital lease payments will still be a financing cash outflow. These estimates, which are based on our current lease portfolio, may change as we continue to evaluate the new standard and perform the necessary reconciliations between our recently implemented global lease accounting system and our lease expense accounts. The estimates could also change due to changes in the lease portfolio, which could include (a) lease volume, (b) lease commencement dates, and (c) renewal option and lease termination expectations. We do not believe the new standard will have a notable impact on our liquidity. The standard will have no impact on our debt-covenant compliance under our current agreements as the covenant calculations are based on the prior lease accounting rules. In August 2017, the FASB issued ASU No. 2017-12, "Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which amends the hedge accounting recognition and presentation requirements in ASC 815 ("Derivatives and Hedging"). ASU 2017-12 significantly alters the hedge accounting model by making it easier for an entity to achieve and maintain hedge accounting and provides for accounting that better reflects an entity's risk management activities. ASU 2017-12 is effective for fiscal years and interim periods beginning after December 15, 2018; we are adopting the standard in the first quarter of 2019. Entities will adopt the provisions of ASU 2017-12 by applying a modified retrospective approach to existing hedging relationships as of the adoption date. At this time, we are still evaluating the impact of this standard on our financial statements. In August 2018, the FASB issued ASU No. 2018-13, "Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13"), which removes, modifies, and adds certain disclosure requirements in ASC 820. ASU 2018-13 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures but do not believe that it will have a material impact. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), and in November 2018 issued a subsequent amendment, ASU 2018-19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses" ("ASU 2018-19"). ASU 2016-13 significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. ASU 2016-13 will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. ASU 2018-19 will affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope of this amendment that have the contractual right to receive cash. ASU 2016-13 and ASU 2018-19 should be applied on either a prospective transition or modified-retrospective approach depending on the subtopic. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods therein. Early adoption is permitted for annual periods beginning after December 15, 2018, and interim periods therein. We are currently evaluating the impact of the adoption of this standard on our consolidated financial statements.

Revenue Recognition Revenue Rec

Revenue Recognition Revenue Reconition (Notes)	12 Months Ended
	Dec. 31, 2018
Revenue Recognition [Abstract]
Revenue From Contract With Customer	Revenue Recognition The core principle of ASC 606 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. ASC 606 defines a five-step process to achieve this core principle, which includes: 1. Identifying contracts with customers, 2. Identifying performance obligations within those contracts, 3. Determining the transaction price, 4. Allocating the transaction price to the performance obligations in the contract, which may include an estimate of variable consideration, and 5. Recognizing revenue when or as each performance obligation is satisfied. The majority of our revenue is derived from the sale of vehicle parts. Under both the previous revenue standards and ASC 606, we recognize revenue when the products are shipped to, delivered to or picked up by customers, which is the point when title has transferred and risk of ownership has passed. Sources of Revenue We report our revenue in two categories: (i) parts and services and (ii) other. The following table sets forth our revenue by category, with our parts and services revenue further disaggregated by reportable segment (in thousands): Year Ended December 31, 2018 2017 2016 North America $ 4,558,220 $ 4,278,531 $ 4,009,129 Europe 5,202,231 3,628,906 2,915,841 Specialty 1,472,956 1,301,197 1,219,675 Parts and services 11,233,407 9,208,634 8,144,645 Other 643,267 528,275 439,386 Total revenue $ 11,876,674 $ 9,736,909 $ 8,584,031 Parts and Services Our parts revenue is generated from the sale of vehicle products including replacement parts, components and systems used in the repair and maintenance of vehicles and specialty products and accessories to improve the performance, functionality and appearance of vehicles. Services revenue includes additional services that are generally billed concurrently with the related product sales, such as the sale of service-type warranties and fees for admission to our self service yards. In North America, our vehicle replacement products include sheet metal collision parts such as doors, hoods, and fenders; bumper covers; head and tail lamps; automotive glass products such as windshields; mirrors and grilles; wheels; and large mechanical items such as engines and transmissions. In Europe, our products include a wide variety of small mechanical products such as brake pads, discs and sensors; clutches; electrical products such as spark plugs and batteries; steering and suspension products; filters; and oil and automotive fluids. In our Specialty operations, we serve six product segments: truck and off-road; speed and performance; RV; towing; wheels, tires and performance handling; and miscellaneous accessories. Our service-type warranties typically have service periods ranging from 6 months to 36 months . Under ASC 606, proceeds from these service-type warranties are deferred at contract inception and amortized on a straight-line basis to revenue over the contract period. The changes in deferred service-type warranty revenue are as follows (in thousands): Balance as of January 1, 2018 $ 19,465 Additional warranty revenue deferred 38,736 Warranty revenue recognized (34,195 ) Balance as of December 31, 2018 $ 24,006 Other Revenue Revenue from other sources includes scrap sales, bulk sales to mechanical manufacturers (including cores) and sales of aluminum ingots and sows from our furnace operations. We derive scrap metal from several sources, including vehicles that have been used in both our wholesale and self service recycling operations and from OEMs and other entities that contract with us for secure disposal of "crush only" vehicles. The sale of hulks in our wholesale and self service recycling operations represents one performance obligation, and revenue is recognized based on a price per weight when the customer (processor) collects the scrap. Some adjustments may occur when the customer weighs the scrap at their location, and revenue is adjusted accordingly. We constrain our estimate of consideration to be received to the extent that we believe there will not be a significant reversal in revenue. Revenue by Geographic Area See Note 16, "Segment and Geographic Information" for information related to our revenue by geographic region. Variable Consideration The amount of revenue ultimately received from the customer can vary due to variable consideration which includes returns, discounts, rebates, refunds, credits, price concessions, incentives, performance bonuses, or other similar items. The previous revenue guidance required us to estimate the transaction price using a best estimate approach. Under ASC 606 we are required to select the “expected value method” or the “most likely amount” method in order to estimate variable consideration. We utilize both methods in practice depending on the type of variable consideration. In addition, our estimates of variable consideration are constrained to the extent that a significant reversal in revenue is not expected. We recorded a refund liability and return asset for expected returns of $105 million and $56 million , respectively, as of December 31, 2018 and a net reserve of $38 million as of December 31, 2017. The refund liability is presented separately on the balance sheet within current liabilities while the return asset is presented within prepaid expenses and other current assets. Other types of variable consideration consist primarily of discounts, volume rebates, and other customer sales incentives which are recorded in Receivables, net on the Consolidated Balance Sheets. We recorded a reserve for our variable consideration of $103 million and $78 million as of December 31, 2018 and December 31, 2017 , respectively. Our May 2018 acquisition of Stahlgruber contributed $26 million to our variable consideration reserve; see Note 2, "Business Combinations" for further information on our acquisitions. While other customer incentive programs exist, we characterize them as material rights in the context of our sales transactions. We consider these programs to be immaterial to our consolidated financial statements. Contract Costs Under ASC 340, "Other Assets and Deferred Costs," we have elected to recognize incremental costs of obtaining a contract (commissions earned by our sales representatives on product sales) as an expense when incurred, as we believe the amortization period of the asset would be one year or less due to the short-term nature of our contracts. Sales Taxes We present taxes assessed by governmental authorities collected from customers on a net basis. Therefore, the taxes are excluded from revenue on our Consolidated Statements of Income and are shown as a current liability on our Consolidated Balance Sheets until remitted.

Restructuring and Acquisition R

Restructuring and Acquisition Related Expenses (Notes)	12 Months Ended
	Dec. 31, 2018
Restructuring and Related Activities [Abstract]
Restructuring and Acquisition Related Expenses	Restructuring and Acquisition Related Expenses Acquisition Related Expenses Acquisition related expenses, which include external costs such as legal, accounting and advisory fees, totaled $18 million , $15 million , and $22 million for the years ended December 31, 2018 , 2017 , and 2016 , respectively. Our 2018 expenses primarily consisted of external costs related to our acquisition of Stahlgruber totaling $16 million . The remaining acquisition related costs for the year ended December 31, 2018 related to (i) completed acquisitions, (ii) pending acquisitions as of December 31, 2018 , and (iii) potential acquisitions that were terminated. Acquisition related expenses for 2017 included $5 million of costs for our acquisition of Andrew Page, primarily related to legal and other professional fees associated with the CMA review. The remaining acquisition related costs for the year ended December 31, 2017 consisted of external costs for (i) completed acquisitions, (ii) pending acquisitions as of December 31, 2017, including $4 million related to Stahlgruber, and (iii) potential acquisitions that were terminated. Acquisition related expenses for 2016 included $11 million related to our Rhiag acquisition, $4 million related to our acquisition of PGW, and $7 million related to other completed acquisitions and acquisitions that were pending as of December 31, 2016. Acquisition Integration Plans and Restructuring During the year ended December 31, 2018 , we incurred $14 million of restructuring expenses. Expenses incurred during the year ended December 31, 2018 primarily consisted of $10 million related to the integration of our acquisition of Andrew Page and $3 million related to our Specialty segment. These integration activities included the closure of duplicate facilities and termination of employees. During the year ended December 31, 2017, we incurred $5 million of restructuring expenses. Expenses incurred during the year ended December 31, 2017 were primarily a result of our ongoing integration activities in our North America and Specialty segments. Expenses incurred were primarily related to facility closure and the merger of existing facilities into larger distribution centers. During the year ended December 31, 2016, we incurred $16 million of restructuring expenses. Of this amount, $10 million was related to integration activities in our Specialty segment, primarily a result of the integration of our Coast acquisition into our existing Specialty business. Expenses incurred were primarily related to facility closure and relocation costs for duplicate facilities, the merger of existing facilities into larger distribution centers, and the termination of employees. We also incurred $3 million and $2 million of restructuring expenses, including primarily facility rationalization activities, related to our North America and Europe acquisitions, respectively. We expect to incur additional expenses related to the integration of certain of our acquisitions into our existing operations in 2019. These integration activities are expected to include the closure of duplicate facilities, rationalization of personnel in connection with the consolidation of overlapping facilities with our existing business, and moving expenses. Future expenses to complete these integration plans are expected to be less than $15 million .

Equity Incentive Plans

Equity Incentive Plans	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Equity Incentive Plans	Stock-Based Compensation In order to attract and retain employees, non-employee directors, consultants, and other persons associated with us, we may grant qualified and nonqualified stock options, stock appreciation rights, restricted stock, restricted stock units (“RSUs”), performance shares and performance units under the LKQ Corporation 1998 Equity Incentive Plan (the “Equity Incentive Plan”). The total number of shares approved by our stockholders for issuance under the Equity Incentive Plan is 70 million shares, subject to antidilution and other adjustment provisions. We have granted RSUs, stock options, and restricted stock under the Equity Incentive Plan. Of the shares approved by our stockholders for issuance under the Equity Incentive Plan, 11 million shares remained available for issuance as of December 31, 2018 . We expect to issue new or treasury shares of common stock to cover past and future equity grants. RSUs RSUs vest over periods of up to five years, subject to a continued service condition. Currently outstanding RSUs contain either a time-based vesting condition or a combination of a performance-based vesting condition and a time-based vesting condition, in which case both conditions must be met before any RSUs vest. For most of the RSUs containing a performance-based vesting condition, the Company must report positive diluted earnings per share, subject to certain adjustments, during any fiscal year period within five years following the grant date; we have an immaterial amount of RSUs containing other performance-based vesting conditions. Each RSU converts into one share of LKQ common stock on the applicable vesting date. The grant date fair value of RSUs is based on the market price of LKQ stock on the grant date. The Compensation Committee of our Board of Directors (the "Compensation Committee") approved the grant of 189,204 ; 235,537 ; and 261,851 RSUs to our executive officers that include both a performance-based vesting condition and a time-based vesting condition in 2018 , 2017 , and 2016 , respectively. The performance-based vesting conditions for the 2018 , 2017 , and 2016 grants to our executive officers have been satisfied. The fair value of RSUs that vested during the years ended December 31, 2018 , 2017 , and 2016 was $27 million , $28 million , and $29 million , respectively; the fair value of RSUs vested is based on the market price of LKQ stock on the date vested. In February 2019, the Compensation Committee approved the grant of up to $24 million of RSUs to employees. The Compensation Committee also approved the grant of $3 million of performance-based three-year RSUs to employees. As these awards are performance based, the exact number of shares to be paid out may be up to twice the grant amount, depending on the Company's performance and the achievement of certain performance metrics over the three year period ending December 31, 2021. The grant date of these awards is March 1, 2019. The range of the possible number of RSUs to be granted will depend on our share price on the grant date. The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the year ended December 31, 2018 : Number Outstanding Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Unvested as of January 1, 2018 1,624,390 $ 29.94 Granted (2) 601,802 $ 42.58 Vested (704,909 ) $ 30.03 Forfeited / Canceled (45,601 ) $ 33.43 Unvested as of December 31, 2018 1,475,682 $ 34.94 Expected to vest after December 31, 2018 1,351,169 $ 34.89 2.3 $ 32,063 (1) The aggregate intrinsic value of expected to vest RSUs represents the total pretax intrinsic value (the fair value of the Company's stock on the last day of each period multiplied by the number of units) that would have been received by the holders had all RSUs vested. This amount changes based on the market price of the Company’s common stock. (2) The weighted average grant date fair value of RSUs granted during the years ended December 31, 2017 and 2016 was $32.15 and $29.05 , respectively. Stock Options Stock options vest over periods of up to five years, subject to a continued service condition. Stock options expire either six or ten years from the date they are granted. No options were granted during 2018 , 2017 or 2016. No options vested during the year ended December 31, 2018 ; all of our outstanding options are fully vested. The total grant-date fair value of options that vested during the year ended December 31, 2017 was $1 million ; no options vested during the years ended December 31, 2018 and 2016 . The following table summarizes activity related to our stock options under the Equity Incentive Plan for the year ended December 31, 2018 : Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Balance as of January 1, 2018 1,738,073 $ 9.20 Exercised (686,070 ) $ 7.73 $ 17,504 Canceled (509 ) $ 32.31 Balance as of December 31, 2018 1,051,494 $ 10.15 0.9 $ 14,570 Exercisable as of December 31, 2018 1,051,494 $ 10.15 0.9 $ 14,570 (1) The aggregate intrinsic value of outstanding and exercisable options represents the total pretax intrinsic value (the difference between the fair value of the Company's stock on the last day of each period and the exercise price, multiplied by the number of options where the fair value exceeds the exercise price) that would have been received by the option holders had all option holders exercised their options as of the last day of the period indicated. This amount changes based on the market price of the Company’s common stock. The aggregate intrinsic value of stock options exercised during the years ended December 31, 2017 and 2016 , was $21 million and $28 million , respectively. Stock-Based Compensation Expense For the RSUs that contain both a performance-based vesting condition and a time-based vesting condition, we recognize compensation expense under the accelerated attribution method, pursuant to which expense is recognized over the requisite service period for each separate vesting tranche of the award. During the years ended December 31, 2018 , 2017 , and 2016 , we recognized $8 million , $7 million , and $7 million , respectively, of stock based compensation expense related to the RSUs containing a performance-based vesting condition. For all other awards, which are subject to only a time-based vesting condition, we recognize compensation expense on a straight-line basis over the requisite service period of the entire award. Forfeitures are recorded as they occur. The components of pre-tax stock-based compensation expense for our continuing operations are as follows (in thousands): Year Ended December 31, 2018 2017 2016 RSUs $ 22,760 $ 22,826 $ 22,183 Stock options and other — 6 162 Total stock-based compensation expense $ 22,760 $ 22,832 $ 22,345 The following table sets forth the classification of total stock-based compensation expense included in our Consolidated Statements of Income for our continuing operations (in thousands): Year Ended December 31, 2018 2017 2016 Cost of goods sold $ 469 $ 434 $ 407 Selling, general and administrative expenses 22,291 22,398 21,938 Total stock-based compensation expense 22,760 22,832 22,345 Income tax benefit (5,220 ) (5,459 ) (8,268 ) Total stock-based compensation expense, net of tax $ 17,540 $ 17,373 $ 14,077 We have not capitalized any stock-based compensation costs during the years ended December 31, 2018 , 2017 , and 2016 . As of December 31, 2018 , unrecognized compensation expense related to unvested RSUs is expected to be recognized as follows (in thousands): RSUs 2019 $ 15,166 2020 9,715 2021 6,315 2022 3,458 2023 150 Total unrecognized compensation expense $ 34,804 Stock-based compensation expense related to these awards will be different to the extent that forfeitures are realized.

Earnings Per Share Earnings Per

Earnings Per Share Earnings Per Share (Notes)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Share [Text Block]	Earnings Per Share Basic earnings per share are computed using the weighted average number of common shares outstanding during the period. Diluted earnings per share incorporate the incremental shares issuable upon the assumed exercise of stock options and the assumed vesting of RSUs. Certain of our RSUs and stock options were excluded from the calculation of diluted earnings per share because they were antidilutive, but these equity instruments could be dilutive in the future. The following chart sets forth the computation of earnings per share (in thousands, except per share amounts): Year Ended December 31, 2018 2017 2016 Income from continuing operations $ 487,565 $ 536,974 $ 456,123 Denominator for basic earnings per share—Weighted-average shares outstanding 314,428 308,607 306,897 Effect of dilutive securities: RSUs 409 544 689 Stock options 1,012 1,498 2,198 Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding 315,849 310,649 309,784 Basic earnings per share from continuing operations $ 1.55 $ 1.74 $ 1.49 Diluted earnings per share from continuing operations $ 1.54 $ 1.73 $ 1.47 The following table sets forth the number of employee stock-based compensation awards outstanding but not included in the computation of diluted earnings per share because their effect would have been antidilutive for the years ended December 31, 2018 , 2017 , and 2016 (in thousands): Year Ended December 31, 2018 2017 2016 Antidilutive securities: RSUs 410 37 57 Stock options 8 39 63

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Foreign Unrealized (Loss) Gain Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Balance at January 1, 2016 $ (96,890 ) $ (932 ) $ (7,648 ) $ — $ (105,470 ) Pretax (loss) income (175,639 ) 12,382 7,175 — (156,082 ) Income tax effect — (4,581 ) (2,636 ) — (7,217 ) Reclassification of unrealized loss (gain) — 1,789 496 — 2,285 Reclassification of deferred income taxes — (567 ) (124 ) — (691 ) Balance at December 31, 2016 $ (272,529 ) $ 8,091 $ (2,737 ) $ — $ (267,175 ) Pretax income (loss) 206,451 (44,550 ) 361 — 162,262 Income tax effect (7,366 ) 16,390 (100 ) — 8,924 Reclassification of unrealized loss (gain) — 50,090 (3,519 ) — 46,571 Reclassification of deferred income taxes — (18,483 ) 659 — (17,824 ) Disposal of business, net 1,511 — (3,436 ) — (1,925 ) Other comprehensive loss from unconsolidated subsidiaries — — — (1,309 ) (1,309 ) Balance at December 31, 2017 $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax (loss) income (113,030 ) 37,552 1,132 — (74,346 ) Income tax effect 4,507 (8,846 ) (403 ) — (4,742 ) Reclassification of unrealized (gain) loss — (37,009 ) (54 ) — (37,063 ) Reclassification of deferred income taxes — 8,653 22 — 8,675 Other comprehensive loss from unconsolidated subsidiaries — — — (2,343 ) (2,343 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Balance at December 31, 2018 $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Accumulated Other Comprehensive Income (Loss) The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Foreign Unrealized (Loss) Gain Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Balance at January 1, 2016 $ (96,890 ) $ (932 ) $ (7,648 ) $ — $ (105,470 ) Pretax (loss) income (175,639 ) 12,382 7,175 — (156,082 ) Income tax effect — (4,581 ) (2,636 ) — (7,217 ) Reclassification of unrealized loss (gain) — 1,789 496 — 2,285 Reclassification of deferred income taxes — (567 ) (124 ) — (691 ) Balance at December 31, 2016 $ (272,529 ) $ 8,091 $ (2,737 ) $ — $ (267,175 ) Pretax income (loss) 206,451 (44,550 ) 361 — 162,262 Income tax effect (7,366 ) 16,390 (100 ) — 8,924 Reclassification of unrealized loss (gain) — 50,090 (3,519 ) — 46,571 Reclassification of deferred income taxes — (18,483 ) 659 — (17,824 ) Disposal of business, net 1,511 — (3,436 ) — (1,925 ) Other comprehensive loss from unconsolidated subsidiaries — — — (1,309 ) (1,309 ) Balance at December 31, 2017 $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax (loss) income (113,030 ) 37,552 1,132 — (74,346 ) Income tax effect 4,507 (8,846 ) (403 ) — (4,742 ) Reclassification of unrealized (gain) loss — (37,009 ) (54 ) — (37,063 ) Reclassification of deferred income taxes — 8,653 22 — 8,675 Other comprehensive loss from unconsolidated subsidiaries — — — (2,343 ) (2,343 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Balance at December 31, 2018 $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Net unrealized gains on our interest rate swaps, inclusive of our interest rate swap agreements and the interest rate swap component of our cross currency swaps, totaling $7 million in the year ended December 31, 2018 were reclassified to Interest expense in our Consolidated Statements of Income, compared to losses of $2 million , and $4 million for the years ended December 31, 2017 and 2016 , respectively. We also reclassified gains of $9 million to Interest expense related to the foreign currency forward component of our cross currency swaps during each of the years ended December 31, 2018 and 2017 ; the amount reclassified during the year ended December 31, 2016 was immaterial. Also related to our cross currency swaps, we reclassified gains of $21 million and $2 million to Interest income and other income, net in our Consolidated Statements of Income during the years ended December 31, 2018 and 2016, respectively, compared to losses of $57 million during the year ended December 31, 2017 ; these gains and losses offset the impact of the remeasurement of the underlying contracts. The deferred income taxes related to our cash flow hedges were reclassified from Accumulated other comprehensive income (loss) to provision for income taxes. Reclassifications of unrealized gains and losses related to our pension plans were reclassified from Accumulated other comprehensive income (loss) to Interest income and other income, net; the related deferred taxes were reclassified from Accumulated other comprehensive income (loss) to provision for income taxes. As a result of the adoption of ASU 2018-02 in the first quarter of 2018, we recorded a $5 million reclassification to increase Accumulated Other Comprehensive (Loss) Income and decrease Retained Earnings. See Note 4, "Summary of Significant Accounting Policies " for further information regarding the adoption of ASU 2018-02.

Long-Term Obligations

Long-Term Obligations	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Long-Term Obligations	Long-Term Obligations Long-term obligations consist of the following (in thousands): December 31, 2018 2017 Senior secured credit agreement: Term loans payable $ 350,000 $ 704,800 Revolving credit facilities 1,387,177 1,283,551 U.S. Notes (2023) 600,000 600,000 Euro Notes (2024) 573,350 600,150 Euro Notes (2026/28) 1,146,700 — Receivables securitization facility 110,000 100,000 Notes payable through May 2027 at weighted average interest rates of 2.0% and 1.4%, respectively 23,056 29,146 Other long-term debt at weighted average interest rates of 2.5% and 1.7%, respectively 157,414 110,633 Total debt 4,347,697 3,428,280 Less: long-term debt issuance costs (36,906 ) (21,476 ) Less: current debt issuance costs (291 ) (2,824 ) Total debt, net of debt issuance costs 4,310,500 3,403,980 Less: current maturities, net of debt issuance costs (121,826 ) (126,360 ) Long term debt, net of debt issuance costs $ 4,188,674 $ 3,277,620 The scheduled maturities of long-term obligations outstanding at December 31, 2018 are as follows (in thousands): 2019 $ 122,117 2020 49,193 2021 137,192 2022 24,410 2023 621,560 Thereafter 3,393,225 Total debt (1) $ 4,347,697 (1) The total debt amounts presented above exclude debt issuance costs totaling $37 million as of December 31, 2018. Senior Secured Credit Agreement On November 20, 2018, LKQ Corporation, LKQ Delaware LLP, and certain other subsidiaries (collectively, the "Borrowers") entered into Amendment No. 3 to the Fourth Amended and Restated Credit Agreement ("Credit Agreement"), which amended the Fourth Amended and Restated Credit Agreement dated January 29, 2016 by modifying certain terms to (1) increase the total availability under the revolving credit facility's multicurrency component from $2.75 billion to $3.15 billion ; (2) reduce the margin on borrowings by 25 basis points at the September 30, 2018 leverage ratio, and reduce the number of leverage pricing tiers; (3) extend the maturity date by one year to January 29, 2024; (4) reduce the unused facility fee depending on leverage category; (5) increase the capacity for incurring additional indebtedness under our receivables securitization facility; (6) increase the maximum borrowing limit of swingline loans and add the ability to borrow in British Pounds and Euros; and (7) make other immaterial or clarifying modifications and amendments to the terms of the Credit Agreement. Borrowings will continue to bear interest at variable rates. Amounts under the revolving credit facility are due and payable upon maturity of the Credit Agreement on January 29, 2024. Term loan borrowings, which total $350 million as of December 31, 2018 , are due and payable in quarterly installments equal to $2 million on the last day of each of the first four fiscal quarters ending on or after March 31, 2019 and approximately $4 million on the last day of each fiscal quarter thereafter, with the remaining balance due and payable on January 29, 2024. The increase in the revolving credit facility's multicurrency component of $400 million was used in part to pay down $240 million of the term loan (to the new $350 million amount); the remainder will be used for general corporate purposes. We are required to prepay the term loan by amounts equal to proceeds from the sale or disposition of certain assets if the proceeds are not reinvested within twelve months. We also have the option to prepay outstanding amounts under the Credit Agreement without penalty. The Credit Agreement contains customary representations and warranties and customary covenants that provide limitations and conditions on our ability to enter into certain transactions. The Credit Agreement also contains financial and affirmative covenants, including limitations on our net leverage ratio and a minimum interest coverage ratio. Borrowings under the Credit Agreement bear interest at variable rates, which depend on the currency and duration of the borrowing elected, plus an applicable margin. The applicable margin is subject to change in increments of 0.25% depending on our net leverage ratio. Interest payments are due on the last day of the selected interest period or quarterly in arrears depending on the type of borrowing. Including the effect of the interest rate swap agreements described in Note 11, "Derivative Instruments and Hedging Activities," the weighted average interest rates on borrowings outstanding under the Credit Agreement at December 31, 2018 and 2017 were 1.9% and 2.2% , respectively. We also pay a commitment fee based on the average daily unused amount of the revolving credit facilities. The commitment fee is subject to change in increments of 0.05% depending on our net leverage ratio. In addition, we pay a participation commission on outstanding letters of credit at an applicable rate based on our net leverage ratio, and a fronting fee of 0.125% to the issuing bank, which are due quarterly in arrears. Of the total borrowings outstanding under the Credit Agreement, there were $9 million classified as current maturities at December 31, 2018 compared to $18 million at December 31, 2017 . As of December 31, 2018 , there were letters of credit outstanding in the aggregate amount of $65 million . The amounts available under the revolving credit facilities are reduced by the amounts outstanding under letters of credit, and thus availability under the revolving credit facilities at December 31, 2018 was $1.7 billion . Related to the execution of Amendment No. 3 to the Fourth Amended and Restated Credit Agreement in November 2018, we incurred $4 million of fees, the majority of which were capitalized as an offset to Long-Term Obligations and are amortized over the term of the agreement. The amounts recorded as a loss on debt extinguishment in the Consolidated Statement of Income for the years ended December 31, 2018 and 2017 were primarily related to the write-off of capitalized debt issuance costs related to various amendments to our Fourth Amended and Restated Credit Agreement. U.S. Notes (2023) In 2013, we issued $600 million aggregate principal amount of 4.75% senior notes due 2023 (the "U.S. Notes (2023)"). The U.S. Notes (2023) are governed by the Indenture dated as of May 9, 2013 (the "U.S. Notes (2023) Indenture") among LKQ Corporation, certain of our subsidiaries (the "Guarantors"), the trustee, paying agent, transfer agent and registrar. The U.S. Notes (2023) are registered under the Securities Act of 1933. The U.S. Notes (2023) bear interest at a rate of 4.75% per year from the most recent payment date on which interest has been paid or provided for. Interest on the U.S. Notes (2023) is payable in arrears on May 15 and November 15 of each year. The U.S. Notes (2023) are fully and unconditionally guaranteed, jointly and severally, by the Guarantors. The U.S. Notes (2023) and the related guarantees are, respectively, LKQ Corporation's and each Guarantor's senior unsecured obligations and are subordinated to all of the Guarantors' existing and future secured debt to the extent of the assets securing that secured debt. In addition, the U.S. Notes (2023) are effectively subordinated to all of the liabilities of our subsidiaries that are not guaranteeing the U.S. Notes (2023) to the extent of the assets of those subsidiaries. Repayment of Rhiag Acquired Debt and Debt Related Liabilities On March 24, 2016, LKQ Netherlands B.V., a wholly-owned subsidiary of LKQ Corporation, borrowed €508 million under our multi-currency revolving credit facility to repay the debt and debt related liabilities assumed as part of our acquisition of Rhiag. The borrowed funds were passed through an intercompany note to Rhiag and then were used to pay (i) $520 million ( €465 million ) for the principal of Rhiag senior note debt assumed with the acquisition, (ii) accrued interest of $8 million ( €7 million ) on the notes, (iii) the call premium of $24 million ( €21 million ) associated with early redemption of the notes and (iv) $5 million ( €4 million ) to terminate Rhiag’s outstanding interest rate swap related to the floating rate portion of the notes. The call premium is recorded as a loss on debt extinguishment in the Consolidated Statements of Income. Euro Notes (2024) On April 14, 2016, LKQ Italia Bondco S.p.A. (“LKQ Italia”), an indirect, wholly-owned subsidiary of LKQ Corporation, completed an offering of €500 million aggregate principal amount of senior notes due April 1, 2024 (the “Euro Notes (2024)”) in a private placement conducted pursuant to Regulation S and Rule 144A under the Securities Act of 1933. The proceeds from the offering were used to repay a portion of the revolver borrowings under the Credit Agreement and to pay related fees and expenses. The Euro Notes (2024) are governed by the Indenture dated as of April 14, 2016 (the “Euro Notes (2024) Indenture”) among LKQ Italia, LKQ Corporation and certain of our subsidiaries (the “Euro Notes (2024) Subsidiaries”), the trustee, and the paying agent, transfer agent, and registrar. The Euro Notes (2024) bear interest at a rate of 3.875% per year from the date of original issuance or from the most recent payment date on which interest has been paid or provided for. Interest on the Euro Notes (2024) is payable in arrears on April 1 and October 1 of each year. The Euro Notes (2024) are fully and unconditionally guaranteed by LKQ Corporation and the Euro Notes (2024) Subsidiaries (the "Euro Notes (2024) Guarantors"). The Euro Notes (2024) and the related guarantees are, respectively, LKQ Italia’s and each Euro Notes (2024) Guarantor’s senior unsecured obligations and are subordinated to all of LKQ Italia's and the Euro Notes (2024) Guarantors’ existing and future secured debt to the extent of the assets securing that secured debt. In addition, the Euro Notes (2024) are effectively subordinated to all of the liabilities of our subsidiaries that are not guaranteeing the Euro Notes (2024) to the extent of the assets of those subsidiaries. The Euro Notes (2024) have been listed on the ExtraMOT, Professional Segment of the Borsa Italia S.p.A. securities exchange and the Global Exchange Market of Euronext Dublin. Related to the execution of the Euro Notes (2024) in April 2016, we incurred $10 million of fees which were capitalized as an offset to Long-Term Obligations and are amortized over the term of the Euro Notes (2024). Euro Notes (2026/28) On April 9, 2018, LKQ European Holdings B.V. ("LKQ Euro Holdings"), a wholly-owned subsidiary of LKQ Corporation, completed an offering of €1.0 billion aggregate principal amount of senior notes. The offering consisted of €750 million senior notes due 2026 (the "2026 notes") and €250 million senior notes due 2028 (the "2028 notes" and, together with the 2026 notes, the "Euro Notes (2026/28)") in a private placement conducted pursuant to Regulation S and Rule 144A under the Securities Act of 1933. The proceeds from the offering, together with borrowings under our senior secured credit facility, were or will be used to (i) finance a portion of the consideration paid for the Stahlgruber acquisition, (ii) for general corporate purposes and (iii) to pay related fees and expenses, including the refinancing of net financial debt. The Euro Notes (2026/28) are governed by the Indenture dated as of April 9, 2018 (the “Euro Notes (2026/28) Indenture”) among LKQ Euro Holdings, LKQ Corporation and certain of our subsidiaries (the “Euro Notes (2026/28) Subsidiaries”), the trustee, paying agent, transfer agent, and registrar. The 2026 notes and 2028 notes bear interest at a rate of 3.625% and 4.125% , respectively, per year from the date of original issuance or from the most recent payment date on which interest has been paid or provided for. Interest on the Euro Notes (2026/28) is payable in arrears on April 1 and October 1 of each year, beginning on October 1, 2018. The Euro Notes (2026/28) are fully and unconditionally guaranteed by LKQ Corporation and the Euro Notes (2026/28) Subsidiaries (the "Euro Notes (2026/28) Guarantors"). The Euro Notes (2026/28) and the related guarantees are, respectively, LKQ Euro Holdings' and each Euro Notes (2026/28) Guarantor’s senior unsecured obligations and will be subordinated to all of LKQ Euro Holdings' and the Euro Notes (2026/28) Guarantors’ existing and future secured debt to the extent of the assets securing that secured debt. In addition, the Euro Notes (2026/28) are effectively subordinated to all of the liabilities of our subsidiaries that are not guaranteeing the Euro Notes (2026/28) to the extent of the assets of those subsidiaries. The Euro Notes (2026/28) have been listed on the Global Exchange Market of Euronext Dublin. Related to the execution of the Euro Notes (2026/28) in April 2018, we incurred $16 million of fees, which were capitalized as an offset to Long-Term Obligations and are amortized over the term of the Euro Notes (2026/28). Restricted Payments Our senior secured credit agreement and our senior notes indentures contain limitations on payment of cash dividends or other distributions of assets. Based on limitations in effect under our senior secured credit agreement and senior notes indentures, the maximum amount of dividends we could pay as of December 31, 2018 was approximately $1.7 billion . The limit on the payment of dividends is calculated using historical financial information and will change from period to period. Receivables Securitization Facility On December 20, 2018, we amended the terms of our receivables securitization facility with MUFG to: (i) extend the term of the facility to November 8, 2021; (ii) increase the maximum amount available to $110 million ; and (iii) make other clarifying and updating changes. Under the facility, LKQ sells an ownership interest in certain receivables, related collections and security interests to MUFG for the benefit of conduit investors and/or financial institutions for cash proceeds. Upon payment of the receivables by customers, rather than remitting to MUFG the amounts collected, LKQ retains such collections as proceeds for the sale of new receivables generated by certain of the ongoing operations of the Company. The sale of the ownership interest in the receivables is accounted for as a secured borrowing in our Consolidated Balance Sheets, under which the receivables included in the program collateralize the amounts invested by MUFG, the conduit investors and/or financial institutions (the "Purchasers"). The receivables are held by LKQ Receivables Finance Company, LLC ("LRFC"), a wholly owned bankruptcy-remote special purpose subsidiary of LKQ, and therefore, the receivables are available first to satisfy the creditors of LRFC, including the Purchasers. Net receivables totaling $132 million and $144 million were collateral for the investment under the receivables facility as of December 31, 2018 and 2017, respectively. Under the receivables facility, we pay variable interest rates plus a margin on the outstanding amounts invested by the Purchasers. The variable rates are based on (i) commercial paper rates, (ii) LIBOR, or (iii) base rates, and are payable monthly in arrears. The commercial paper rate is the applicable variable rate unless conduit investors are not available to invest in the receivables at commercial paper rates. In such case, financial institutions will invest at the LIBOR rate or at base rates. We also pay a commitment fee on the excess of the investment maximum over the average daily outstanding investment, payable monthly in arrears. As of December 31, 2018 , the interest rate under the receivables facility was based on commercial paper rates and was 3.4% . The outstanding balances of $110 million and $100 million as of December 31, 2018 and 2017 , respectively, were classified as long-term on the Consolidated Balance Sheets because we have the ability and intent to refinance these borrowings on a long-term basis.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities (Notes)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Derivative Instruments and Hedging Activities We are exposed to market risks, including the effect of changes in interest rates, foreign currency exchange rates and commodity prices. Under our current policies, we use derivatives to manage our exposure to variable interest rates on our senior secured debt and changing foreign exchange rates for certain foreign currency denominated transactions. We do not hold or issue derivatives for trading purposes. Cash Flow Hedges We hold interest rate swap agreements to hedge a portion of the variable interest rate risk on our variable rate borrowings under our Credit Agreement, with the objective of minimizing the impact of interest rate fluctuations and stabilizing cash flows. Under the terms of the interest rate swap agreements, we pay the fixed interest rate and receive payment at a variable rate of interest based on LIBOR for the respective currency of each interest rate swap agreement’s notional amount. The effective portion of changes in the fair value of the interest rate swap agreements is recorded in Accumulated Other Comprehensive Income (Loss) and is reclassified to interest expense when the underlying interest payment has an impact on earnings. The ineffective portion of changes in the fair value of the interest rate swap agreements is reported in interest expense. Our interest rate swap contracts have maturity dates ranging from January to June 2021. In December 2018, we sold two interest rate swap contracts with a notional amount of $110 million . As of December 31, 2018 , we held interest rate swap contracts related to $480 million of U.S. dollar-denominated debt. From time to time, we may hold foreign currency forward contracts related to certain foreign currency denominated intercompany transactions, with the objective of minimizing the impact of fluctuating exchange rates on these future cash flows. Under the terms of the foreign currency forward contracts, we will sell the foreign currency in exchange for U.S. dollars at a fixed rate on the maturity dates of the contracts. The effective portion of the changes in fair value of the foreign currency forward contracts is recorded in Accumulated Other Comprehensive Income (Loss) and reclassified to other income, net when the underlying transaction has an impact on earnings. In 2016, we entered into three cross currency swap agreements for a total notional amount of $422 million ( €400 million ). The notional amount steps down by €15 million annually through 2020 with the remainder maturing in January 2021. These cross currency swaps contain an interest rate swap component and a foreign currency forward contract component that, combined with related intercompany financing arrangements, effectively convert variable rate U.S. dollar-denominated borrowings into fixed rate euro-denominated borrowings. The swaps are intended to minimize the impact of fluctuating exchange rates and interest rates on the cash flows resulting from the related intercompany financing arrangements. The effective portion of the changes in the fair value of the derivative instruments is recorded in Accumulated Other Comprehensive Income (Loss) and is reclassified to interest expense and interest income and other income, net when the underlying transactions have an impact on earnings. In October 2018, we entered into two cross currency swap agreements for a total notional amount of $184 million ( €160 million ). Half of the notional amount matures in October 2019 with the remainder in October 2020. The purpose and accounting of the swaps are similar to those described in the previous paragraph. The activity related to our cash flow hedges is presented in operating activities in our Consolidated Statements of Cash Flows. The following table summarizes the notional amounts and fair values of our designated cash flow hedges as of December 31, 2018 and 2017 (in thousands): Notional Amount Fair Value at December 31, 2018 (USD) December 31, 2018 Other Current Assets Other Assets Other Accrued Expenses Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 480,000 $ — $ 14,967 $ — $ — Cross currency swap agreements USD/euro $ 574,315 211 7,669 127 40,870 Total cash flow hedges $ 211 $ 22,636 $ 127 $ 40,870 Notional Amount Fair Value at December 31, 2017 (USD) December 31, 2017 Other Assets Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 590,000 $ 19,102 $ — Cross currency swap agreements USD/euro $ 406,546 5,504 61,492 Total cash flow hedges $ 24,606 $ 61,492 While certain derivative instruments executed with the same counterparty are subject to master netting arrangements, we present our cash flow hedge derivative instruments on a gross basis in our Consolidated Balance Sheets. The impact of netting the fair values of these contracts would result in a decrease to Other Assets and Other Noncurrent Liabilities on our Consolidated Balance Sheets of $14 million and $12 million at December 31, 2018 and 2017, respectively. The activity related to our cash flow hedges is included in Note 9, "Accumulated Other Comprehensive Income (Loss) ." Ineffectiveness related to our cash flow hedges was immaterial to our results of operations during 2018 , 2017 , and 2016 . We do not expect future ineffectiveness related to our cash flow hedges to have a material effect on our results of operations. As of December 31, 2018 , we estimate that $2 million of derivative gains (net of tax) included in Accumulated Other Comprehensive Income (Loss) will be reclassified into our Consolidated Statements of Income within the next 12 months. Other Derivative Instruments During the third quarter of 2018, we recorded the fair value of a derivative instrument of $29 million related to our right to acquire Mekonomen shares at a discount. During the year ended December 31, 2018, we recorded a net $5 million loss related to the remeasurement and settlement of the derivative instrument. Refer to Note 4, "Summary of Significant Accounting Policies ," for more information on the derivative instrument. We hold other short-term derivative instruments, including foreign currency forward contracts, to manage our exposure to variability related to inventory purchases and intercompany financing transactions denominated in a non-functional currency. We have elected not to apply hedge accounting for these transactions, and therefore the contracts are adjusted to fair value through our results of operations as of each balance sheet date, which could result in volatility in our earnings. The notional amount and fair value of these contracts at December 31, 2018 and 2017 , along with the effect on our results of operations in 2018 , 2017 and 2016 , were immaterial.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Text Block]	Fair Value Measurements Financial Assets and Liabilities Measured at Fair Value We use the market and income approaches to estimate the fair value of our financial assets and liabilities, and during the year ended December 31, 2018 , there were no significant changes in valuation techniques or inputs related to the financial assets or liabilities that we have historically recorded at fair value. The tiers in the fair value hierarchy include: Level 1, defined as observable inputs such as quoted market prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as significant unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. The following tables present information about our financial assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs we utilized to determine such fair value as of December 31, 2018 and December 31, 2017 (in thousands): Balance as of December 31, 2018 Fair Value Measurements as of December 31, 2018 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 47,649 $ — $ 47,649 $ — Interest rate swaps 14,967 — 14,967 — Cross currency swap agreements 7,880 — 7,880 — Total Assets $ 70,496 $ — $ 70,496 $ — Liabilities: Contingent consideration liabilities $ 5,209 $ — $ — $ 5,209 Deferred compensation liabilities 48,984 — 48,984 — Cross currency swap agreements 40,997 — 40,997 — Total Liabilities $ 95,190 $ — $ 89,981 $ 5,209 Balance as of December 31, 2017 Fair Value Measurements as of December 31, 2017 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 45,984 $ — $ 45,984 $ — Interest rate swaps 19,102 — 19,102 — Cross currency swap agreements 5,504 — 5,504 — Total Assets $ 70,590 $ — $ 70,590 $ — Liabilities: Contingent consideration liabilities $ 2,636 $ — $ — $ 2,636 Deferred compensation liabilities 47,199 — 47,199 — Cross currency swap agreements 61,492 — 61,492 — Total Liabilities $ 111,327 $ — $ 108,691 $ 2,636 The cash surrender value of life insurance is included in Other assets on our Consolidated Balance Sheets. The current portion of deferred compensation is included in Accrued payroll-related liabilities and the current portion of contingent consideration liabilities is included in Other current liabilities on our Consolidated Balance Sheets; the noncurrent portion of these amounts is included in Other noncurrent liabilities on our Consolidated Balance Sheets based on the expected timing of the related payments. The balance sheet classification of the interest rate swaps and cross currency swap agreements is presented in Note 11, "Derivative Instruments and Hedging Activities ." Our Level 2 assets and liabilities are valued using inputs from third parties and market observable data. We obtain valuation data for the cash surrender value of life insurance and deferred compensation liabilities from third party sources, which determine the net asset values for our accounts using quoted market prices, investment allocations and reportable trades. We value our other derivative instruments using a third party valuation model that performs a discounted cash flow analysis based on the terms of the contracts and market observable inputs such as current and forward interest rates and current and forward foreign exchange rates. Our contingent consideration liabilities are related to our business acquisitions. Under the terms of the contingent consideration agreements, payments may be made at specified future dates depending on the performance of the acquired business subsequent to the acquisition. The liabilities for these payments are classified as Level 3 liabilities because the related fair value measurement, which is determined using an income approach, includes significant inputs not observable in the market. Financial Assets and Liabilities Not Measured at Fair Value Our debt is reflected on the Consolidated Balance Sheets at cost. Based on market conditions as of December 31, 2018 and 2017 , the fair value of our credit agreement borrowings reasonably approximated the carrying values of $1.7 billion and $2.0 billion , respectively. In addition, based on market conditions, the fair values of the outstanding borrowings under the receivables facility reasonably approximated the carrying values of $110 million and $100 million at December 31, 2018 and December 31, 2017 , respectively. As of December 31, 2018 and December 31, 2017 , the fair values of the U.S. Notes (2023) were approximately $574 million and $615 million , respectively, compared to a carrying value of $600 million at each date. As of December 31, 2018 and December 31, 2017 , the fair values of the Euro Notes (2024) were approximately $586 million and $658 million compared to carrying values of $573 million and $600 million , respectively. As of December 31, 2018, the fair value of the Euro Notes (2026/28) approximated the carrying value of $ 1.1 billion . The fair value measurements of the borrowings under our credit agreement and receivables facility are classified as Level 2 within the fair value hierarchy since they are determined based upon significant inputs observable in the market, including interest rates on recent financing transactions with similar terms and maturities. We estimated the fair value by calculating the upfront cash payment a market participant would require at December 31, 2018 to assume these obligations. The fair value of our U.S. Notes (2023) is classified as Level 1 within the fair value hierarchy since it is determined based upon observable market inputs including quoted market prices in an active market. The fair values of our Euro Notes (2024) and Euro Notes (2026/28) are determined based upon observable market inputs including quoted market prices in markets that are not active, and therefore are classified as Level 2 within the fair value hierarchy.

Income Taxes (Notes)

Income Taxes (Notes)	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Text Block]	Income Taxes The provision for income taxes consists of the following components (in thousands): Year Ended December 31, 2018 2017 2016 Current: Federal $ 90,216 $ 196,825 $ 159,547 State 25,851 27,149 27,120 Foreign 77,508 58,123 45,545 Total current provision for income taxes $ 193,575 $ 282,097 $ 232,212 Deferred: Federal $ 14,977 $ (37,486 ) $ 1,169 State 4,386 4,044 2,131 Foreign (21,543 ) (13,095 ) (14,946 ) Total deferred benefit for income taxes $ (2,180 ) $ (46,537 ) $ (11,646 ) Provision for income taxes $ 191,395 $ 235,560 $ 220,566 Income taxes have been based on the following components of income from continuing operations before provision for income taxes (in thousands): Year Ended December 31, 2018 2017 2016 Domestic $ 562,758 $ 575,148 $ 513,844 Foreign 180,673 191,479 163,437 Income from continuing operations before provision for income taxes $ 743,431 $ 766,627 $ 677,281 The U.S. federal statutory rate is reconciled to the effective tax rate as follows: Year Ended December 31, 2018 2017 2016 U.S. federal statutory rate 21.0 % 35.0 % 35.0 % U.S. federal tax reform - federal deferred tax rate change — % (9.5 )% — % U.S. federal tax reform - transition tax on foreign earnings (1.3 )% 6.6 % — % State income taxes, net of state credits and federal tax impact 3.5 % 2.8 % 2.7 % Impact of rates on international operations 0.9 % (3.2 )% (3.2 )% Notional interest deductions (0.6 )% (0.9 )% (2.5 )% Excess tax benefits from stock-based compensation (0.6 )% (1.0 )% (1.6 )% Non-deductible expenses 1.6 % 1.1 % 1.3 % Other, net 1.2 % (0.2 )% 0.9 % Effective tax rate 25.7 % 30.7 % 32.6 % On December 22, 2017, the U.S. government enacted the Tax Act. The Tax Act introduced broad and complex changes to U.S. income tax laws that impact us, most notably a reduction of the U.S. statutory corporate tax rate from 35% to 21% for tax years beginning after December 31, 2017. Additionally, beginning in 2018 the Tax Act imposed a regime of taxation on foreign subsidiary earnings, GILTI, and on certain related party payments, BEAT. As part of the transition of U.S. international taxation from a worldwide tax system to a modified territorial tax system, the Tax Act imposed a one-time transition tax on the deemed repatriation of historical earnings of foreign subsidiaries as of December 31, 2017. On December 22, 2017, the U.S. Securities and Exchange Commission Staff issued SAB 118, which provided guidance on accounting for the tax effects of the Tax Act. SAB 118 provided a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting required under ASC 740, Income Taxes . In accordance with SAB 118, a company was required to reflect the income tax effects of those aspects of the Tax Act for which the accounting under ASC 740 was complete. To the extent that a company’s accounting for certain income tax effects of the Tax Act was incomplete but the company was able to determine a reasonable estimate, it was required to record a provisional estimate in the financial statements. Transition Tax on Foreign Earnings: In the fourth quarter of 2017, we recognized a provisional income tax expense of $51 million related to the one-time transition tax on foreign earnings. During the third quarter of 2018, we recorded a $10 million favorable adjustment to the provisional amount. As of December 31, 2018, we have completed our analysis of the transition tax, and the liability is no longer considered provisional. As permitted by the Tax Act, we elected to pay the final $41 million liability in installments over 8 years . This liability has been reduced by the first installment and other payment credits to $33 million and is recorded in other liabilities in our consolidated balance sheet. Revaluation of Deferred Tax Assets and Liabilities: As a result of the Tax Act reduction in the U.S. federal statutory rate from 35% to 21% , at December 31, 2017, we recorded a provisional decrease to net deferred tax liabilities and a corresponding provisional U.S. federal deferred tax benefit of $73 million . There were no adjustments recognized in 2018 with regard to the revaluation of deferred taxes, and the accounting for this impact of the Tax Act is now complete. GILTI: While the Tax Act provides for a modified territorial tax system, under a highly complex provision commonly known as GILTI, the Tax Act subjects a U.S. shareholder to current tax on certain earnings of foreign subsidiaries, subject to relief for available foreign tax credits. The FASB Staff Q&A, Topic 740, No. 5, "Accounting for GILTI," provides that an accounting policy election can be made either to recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years, or to provide for the tax expense related to GILTI in the year the tax is incurred as a period expense only. We have elected to account for GILTI in the year the tax is incurred. For the year ended December 31, 2018, the impact of GILTI increased our effective tax rate by approximately 0.3% . The GILTI legislative provisions and related foreign tax credit calculations are still subject to finalization of U.S. Treasury Department regulatory guidance, which could have an impact on our effective tax rate in the future. Indefinite Reinvestment Assertion: Undistributed earnings of our foreign subsidiaries amounted to approximately $664 million at December 31, 2018. Through December 31, 2017, it was our practice and intention to permanently reinvest the undistributed earnings of our foreign subsidiaries, and no U.S. deferred income taxes or foreign withholding taxes were recorded. Beginning in 2018, the Tax Act generally provides a 100% participation exemption from further U.S. taxation of dividends received from 10-percent or more owned foreign corporations held by U.S. corporate shareholders. Although future dividend income is now exempt from U.S. federal tax in the hands of the U.S. corporate shareholders, either as a result of the new participation exemption, or due to the previous taxation of such earnings under the transition tax, companies must still apply the guidance of ASC 740 to account for the tax consequences of outside basis differences and other tax impacts of their investments in non-U.S. subsidiaries. Further, the 2017 transition tax will close a majority of the previous outside basis differences in our foreign subsidiaries, and much of any new differences arising will have extensive interaction with the GILTI regime discussed above. Based on a review of our global financing and capital expenditure requirements as of December 31, 2018, we have made no changes to our assertion that we plan to permanently reinvest the undistributed earnings of our international subsidiaries. Thus, no deferred U.S. income taxes or potential foreign withholding taxes have been recorded. Due to the complexity of the new U.S. tax regime, it remains impractical to estimate the amount of deferred taxes potentially payable were such earnings to be repatriated. Although the SAB 118 measurement period has closed, further technical guidance related to the Tax Act, including final regulations on a broad range of topics, is expected to be issued. In accordance with ASC 740, the Company will recognize any effects of the guidance in the period that such guidance is issued. The significant components of our deferred tax assets and liabilities are as follows (in thousands): December 31, 2018 2017 Deferred Tax Assets: Accrued expenses and reserves $ 60,337 $ 40,317 Qualified and nonqualified retirement plans 20,525 19,074 Inventory 15,474 17,886 Accounts receivable 16,208 16,036 Interest deduction carryforwards 20,392 13,845 Stock-based compensation 4,859 4,963 Net operating loss carryforwards 13,222 11,734 Other 12,370 8,971 Total deferred tax assets, gross 163,387 132,826 Less: valuation allowance (34,779 ) (21,527 ) Total deferred tax assets $ 128,608 $ 111,299 Deferred Tax Liabilities: Goodwill and other intangible assets $ 216,699 $ 192,688 Property, plant and equipment 87,839 67,467 Trade name 116,615 72,233 Other 15,511 16,165 Total deferred tax liabilities $ 436,664 $ 348,553 Net deferred tax liability $ (308,056 ) $ (237,254 ) Deferred tax assets and liabilities are reflected on our Consolidated Balance Sheets as follows (in thousands): December 31, 2018 2017 Noncurrent deferred tax assets $ 3,378 $ 15,105 Noncurrent deferred tax liabilities 311,434 252,359 Our acquisition of Stahlgruber in May 2018 contributed $78 million of net deferred tax liabilities relating to intangible assets; property, plant and equipment; and reserves, including pension and other post-retirement benefit obligations. Noncurrent deferred tax assets and noncurrent deferred tax liabilities are included in Other assets and Deferred income taxes, respectively, on our Consolidated Balance Sheets. We had net operating loss carryforwards, primarily for certain international tax jurisdictions, the tax benefits of which were approximately $13 million and $12 million at December 31, 2018 and 2017 , respectively. At December 31, 2018 and 2017 , we had tax credit carryforwards for certain U.S. state jurisdictions, the tax benefits of which total approximately $1 million and $2 million , respectively. At December 31, 2018 and 2017, we had interest deduction carryforwards, primarily in Italy and Germany, the tax benefits of which were $20 million and $14 million , respectively. As of December 31, 2018, we had a U.S. capital loss carryforward attributable to the sale of the glass manufacturing business of PGW in 2017, the tax benefit of which was $5 million . As of December 31, 2018 and 2017, valuation allowances of $35 million and $22 million , respectively, were recorded for deferred tax assets related to carryforwards of interest deductions, net operating losses, capital losses and tax credits. The $13 million net increase in valuation allowances was primarily attributable to a $6 million valuation allowance provided on certain interest deduction carryforwards suspended due to thin capitalization constraints in Italy and Germany, and a $5 million valuation allowance provided on the U.S. capital loss carryforward. The net operating losses generally carry forward for an indefinite period. The interest deduction carryforwards in Italy and Germany do not expire. U.S. capital losses carry forward for five years. Realization of these deferred tax assets is dependent on the generation of sufficient taxable income prior to the expiration dates, where applicable, or in the case of the interest carryforwards, the availability of typically EBITDA limitations under thin capitalization constraints. Based on historical and projected operating results, we believe that it is more likely than not that earnings will be sufficient to realize the deferred tax assets for which valuation allowances have not been provided. While we expect to realize the deferred tax assets, net of valuation allowances, changes in tax laws or in estimates of future taxable income may alter this expectation. A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands): 2018 2017 2016 Balance at January 1 $ 1,690 $ 2,146 $ 2,273 Additions for acquired tax positions — 73 — Additions based on tax positions related to the current year 5 5 5 Lapse of statutes of limitations (458 ) (534 ) (132 ) Balance at December 31 $ 1,237 $ 1,690 $ 2,146 Included in the balance of unrecognized tax benefits above as of December 31, 2018 , 2017 and 2016 are $1 million of tax benefits that, if recognized, would affect the effective tax rate. The balance of unrecognized tax benefits at December 31, 2018 , 2017 and 2016 include approximately $1 million of tax benefits that, if recognized, would result in adjustments to deferred taxes. The Company recognizes interest and penalties accrued related to unrecognized tax benefits as income tax expense. Attributable to the unrecognized tax benefits noted above, the Company had accumulated interest and penalties of less than $1 million at December 31, 2018 , 2017 and 2016 . During each of the years ended December 31, 2018 , 2017 and 2016 , an immaterial amount of interest and penalties were recorded through the income tax provision, prior to any reversals for lapses in the statutes of limitations. During the twelve months beginning January 1, 2019, it is reasonably possible that we will reduce unrecognized tax benefits by substantially less than $1 million , most of which would impact our effective tax rate, primarily as a result of the expiration of certain statutes of limitations. The company and/or its subsidiaries file income tax returns in the U.S. federal jurisdiction, and various U.S. state and international jurisdictions. With few exceptions, the company is no longer subject to U.S. federal, state and local, or international income tax examinations by tax authorities for years before 2015. Adjustments from examinations, if any, are not expected to have a material effect on our consolidated financial statements.

Employee Benefit Plans (Notes)

Employee Benefit Plans (Notes)	12 Months Ended
	Dec. 31, 2018
Retirement Benefits [Abstract]
Pension and Other Postretirement Benefits Disclosure [Text Block]	Employee Benefit Plans Defined Benefit Plans We have funded and unfunded defined benefit plans covering certain employee groups in the U.S. and various European countries. Local statutory requirements govern many of our European plans. The defined benefit plans are plans are mostly closed to new participants and, in some cases, existing participants no longer accrue benefits. Funded Status The table below summarizes the funded status of our defined benefit plans (in thousands): December 31, 2018 2017 Change in projected benefit obligation: Projected benefit obligation - beginning of year $ 126,031 $ 111,547 Acquisitions (1) 79,211 938 Service cost 3,215 4,525 Interest cost 3,476 3,670 Participant contributions 415 573 Actuarial (gain) / loss (989 ) 4,539 Benefits paid (2) (4,447 ) (3,806 ) Curtailment (3) — (4,064 ) Settlement (756 ) (245 ) Currency impact (4,664 ) 8,354 Projected benefit obligation - end of year $ 201,492 $ 126,031 Change in fair value of plan assets: Fair value - beginning of year $ 82,852 $ 73,057 Acquisitions (1) 251 — Actual return on plan assets 3,018 3,307 Employer contributions 9,975 2,931 Participant contributions 415 573 Benefits paid (2,788 ) (3,040 ) Currency impact (2,051 ) 6,024 Fair value - end of year $ 91,672 $ 82,852 Funded status at end of year (liability) $ (109,820 ) $ (43,179 ) Accumulated benefit obligation $ 199,337 $ 125,389 (1) 2018 amounts relate primarily to the addition of plans in connection with our acquisition of Stahlgruber. (2) Includes amounts paid from plan assets as well as amounts paid from Company assets. (3) In 2017, we froze one of our Europe pension plans, resulting in a curtailment. No additional participants may join this plan and as of December 31, 2017, participants no longer accrue future benefits under this plan. The net amounts recognized for defined benefit plans in the Consolidated Balance Sheets were as follows (in thousands): December 31, 2018 2017 Non-current assets $ 377 $ — Current liabilities (3,280 ) — Non-current liabilities (106,917 ) (43,179 ) $ (109,820 ) $ (43,179 ) The following table summarizes the accumulated benefit obligation and aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets (in thousands): December 31, 2018 2017 Accumulated benefit obligation $ 169,097 $ 125,389 Aggregate fair value of plan assets 60,988 82,852 The following table summarizes the projected benefit obligation and aggregate fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets (in thousands): December 31, 2018 2017 Projected benefit obligation $ 171,185 $ 126,031 Aggregate fair value of plan assets 60,988 82,852 The table below summarizes the weighted-average assumptions used to calculate the year-end benefit obligations: 2018 2017 Discount rate used to determine benefit obligation 2.1 % 2.1 % Rate of future compensation increase 0.9 % 1.3 % Net Periodic Benefit Cost The table below summarizes the components of net periodic benefit cost for our defined benefit plans (in thousands): Year Ended December 31, 2018 2017 2016 Service cost $ 3,215 $ 4,525 $ 3,843 Interest cost 3,476 3,670 2,719 Expected return on plan assets (1) (2,949 ) (2,467 ) (2,624 ) Amortization of prior service credit — (181 ) (266 ) Amortization of actuarial (gain) loss (2) (54 ) 473 762 Curtailment gain — (3,811 ) — Settlement (gain) / loss 74 (4 ) 2 Net periodic benefit cost $ 3,762 $ 2,205 $ 4,436 (1) We use the fair value of our plan assets to calculate the expected return on plan assets. (2) Actuarial gains and losses are amortized using a corridor approach. Gains and losses are amortized if, as of the beginning of the year, the cumulative net gain or loss exceeds 10 percent of the greater of the projected benefit obligation or the fair value of the plan assets. Gains and losses in excess of the corridor are amortized over the average remaining service period of active members expected to receive benefits under the plan or, in the case of closed plans, the expected future lifetime of the employees participating in the plan. For the years ended December 31, 2018 and 2017, the service cost component of net periodic benefit cost was classified in Selling, general and administrative expenses, while the other components of net periodic benefit cost were classified in Other income, net in our Consolidated Statements of Income. For the year ended December 31, 2016, all components of net periodic benefit expense were included in Selling, general, and administrative expenses in our Consolidated Statements of Income. For the year ending December 31, 2019, we expect net periodic benefit costs to increase by approximately $2 million due to the fact that we will incur a full year of pension expense related to our Stahlgruber business, compared to a partial year in 2018. The table below summarizes the weighted-average assumptions used to calculate the net periodic benefit cost in the table above: 2018 2017 2016 Discount rate used to determine service cost 1.3 % 1.5 % 1.6 % Discount rate used to determine interest cost 2.5 % 3.0 % 3.0 % Rate of future compensation increase 1.9 % 1.3 % 2.0 % Expected long-term return on plan assets (1) 4.8 % 5.0 % 5.1 % (1) Our expected long-term return on plan assets is determined based on our asset allocation and estimate of future long-term returns by asset class. Assumed mortality is also a key assumption in determining benefit obligations and net periodic benefit cost. In some of our European plans, a price inflation index is also an assumption in determining benefit obligations and net periodic benefit cost. As of December 31, 2018 , the pre-tax amounts recognized in Accumulated other comprehensive income consisted of $10 million of net actuarial losses for our defined benefit plans that have not yet been recognized in net periodic benefit cost. Of this amount, we expect $0.2 million to be recognized as a component of net periodic benefit cost during the year ending December 31, 2019. Fair Value of Plan Assets Fair value is defined as the amount that would be received for selling an asset or paid to transfer a liability in an orderly transaction between market participants. The tiers in the fair value hierarchy include: Level 1, defined as observable inputs such as quoted market prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as significant unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. Investments that are valued using net asset value ("NAV") (or its equivalent) as a practical expedient are excluded from the fair value hierarchy disclosure. The following is a description of the valuation methodologies used for assets reported at fair value. The methodologies used at December 31, 2018 and December 31, 2017 are the same. Level 1 investments: Cash and cash equivalents are valued based on cost, which approximates fair value. Mutual funds are valued based on reported market prices on the last trading day of the fiscal year. Level 3 investments: Investments in insurance contracts represent the cash surrender value of the insurance policy. These are actuarially determined amounts based on projections of future benefit payments, discount rates, and expected long-term rate of return on assets. For our unfunded pension plans, the Company pays the defined benefit plan obligations when they become due. The table below summarizes the fair value of our defined benefit plan assets by asset category within the fair value hierarchy for our funded defined benefit pension plans (in thousands): December 31, 2018 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash and cash equivalents (1) $ 30,684 $ — $ — $ 30,684 $ 369 $ — $ — $ 369 Mutual funds (2) — — — — 21,709 — — 21,709 Insurance contracts — — 60,988 60,988 — — 60,774 60,774 Total investments at fair value $ 30,684 $ — $ 60,988 $ 91,672 $ 22,078 $ — $ 60,774 $ 82,852 (1) Consists of institutional short-term investment funds. (2) Mutual funds consist of investments in equity securities, fixed-income securities, and real estate. The following table summarizes the changes in fair value measurements of Level 3 investments for our defined benefit plans (in thousands): December 31, 2018 2017 Balance at beginning of year $ 60,774 $ 53,803 Actual return on plan assets: Relating to assets held at the reporting date 2,556 464 Purchases, sales and settlements (541 ) 483 Transfers in and/or out of Level 3 255 — Currency impact (2,056 ) 6,024 Balance at end of year $ 60,988 $ 60,774 Assets for our defined benefit pension plans in Europe are invested in insurance policies. Under these contracts, we pay premiums to the insurance company, which are based on an internal actuarial analysis performed by the insurance company; the insurance company then funds the pension payments to the plan participants upon retirement. The assets for our U.S. plan are managed by a master trust, with oversight responsibility by our Benefits Committee. As of December 31, 2018, our pension assets for our U.S. pension plan are fully invested in money market funds. The investment strategy for our U.S. plan is to invest in low risk investments to protect our principal balance. The investment policy and allocation of the assets in the master trust were approved by our Benefits Committee. Employer Contributions and Estimated Future Benefit Payments During the year ended December 31, 2018 , we contributed $12 million to our pension plans. We estimate that contributions to our pension plans during 2019 will be $4 million . The following table summarizes estimated future benefit payments as of December 31, 2018 (in thousands): Year Ended December 31, Amount 2019 $ 5,818 2020 5,627 2021 6,263 2022 6,966 2023 6,948 2024 - 2028 39,823

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Leases We are obligated under noncancelable operating leases for corporate office space, warehouse and distribution facilities, trucks and certain equipment. The future minimum lease commitments under these leases at December 31, 2018 are as follows (in thousands): Years ending December 31: 2019 $ 294,269 2020 256,172 2021 210,632 2022 158,763 2023 131,518 Thereafter 777,165 Future Minimum Lease Payments $ 1,828,519 Rental expense for operating leases was approximately $300 million , $247 million , and $212 million during the years ended December 31, 2018 , 2017 and 2016 , respectively. We guarantee the residual values of the majority of our truck and equipment operating leases. The residual values decline over the lease terms to a defined percentage of original cost. In the event the lessor does not realize the residual value when a piece of equipment is sold, we would be responsible for a portion of the shortfall. Similarly, if the lessor realizes more than the residual value when a piece of equipment is sold, we would be paid the amount realized over the residual value. Had we terminated all of our operating leases subject to these guarantees at December 31, 2018 , our portion of the guaranteed residual value would have totaled approximately $76 million . We have not recorded a liability for the guaranteed residual value of equipment under operating leases as the recovery on disposition of the equipment under the leases is expected to approximate the guaranteed residual value. Litigation and Related Contingencies We have certain contingencies resulting from litigation, claims and other commitments and are subject to a variety of environmental and pollution control laws and regulations incident to the ordinary course of business. We currently expect that the resolution of such contingencies will not materially affect our financial position, results of operations or cash flows.

Segment and Geographic Informat

Segment and Geographic Information	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Segment and Geographic Information	Segment and Geographic Information We have four operating segments: Wholesale – North America, Europe, Specialty and Self Service. Our Wholesale – North America and Self Service operating segments are aggregated into one reportable segment, North America, because they possess similar economic characteristics and have common products and services, customers, and methods of distribution. Our reportable segments are organized based on a combination of geographic areas served and type of product lines offered. The reportable segments are managed separately as each business serves different customers (i.e. geographic in the case of North America and Europe and product type in the case of Specialty) and is affected by different economic conditions. Therefore, we present three reportable segments: North America, Europe and Specialty. The following tables present our financial performance by reportable segment for the periods indicated (in thousands): North America Europe Specialty Eliminations Consolidated Year Ended December 31, 2018 Revenue: Third Party $ 5,181,964 $ 5,221,754 $ 1,472,956 $ — $ 11,876,674 Intersegment 645 — 4,724 (5,369 ) — Total segment revenue $ 5,182,609 $ 5,221,754 $ 1,477,680 $ (5,369 ) $ 11,876,674 Segment EBITDA $ 660,153 $ 422,721 $ 168,525 $ — $ 1,251,399 Depreciation and amortization (1) 87,348 178,473 28,256 — 294,077 Year Ended December 31, 2017 Revenue: Third Party $ 4,798,901 $ 3,636,811 $ 1,301,197 $ — $ 9,736,909 Intersegment 750 — 4,319 (5,069 ) — Total segment revenue $ 4,799,651 $ 3,636,811 $ 1,305,516 $ (5,069 ) $ 9,736,909 Segment EBITDA $ 655,275 $ 319,156 $ 142,159 $ — $ 1,116,590 Depreciation and amortization (1) 86,303 120,805 23,095 — 230,203 Year Ended December 31, 2016 Revenue: Third Party $ 4,443,886 $ 2,920,470 $ 1,219,675 $ — $ 8,584,031 Intersegment 739 — 4,048 (4,787 ) — Total segment revenue $ 4,444,625 $ 2,920,470 $ 1,223,723 $ (4,787 ) $ 8,584,031 Segment EBITDA $ 589,945 $ 283,608 $ 131,427 $ — $ 1,004,980 Depreciation and amortization (1) 80,923 94,979 22,432 — 198,334 (1) Amounts presented include depreciation and amortization expense recorded within cost of goods sold. The key measure of segment profit or loss reviewed by our chief operating decision maker, who is our Chief Executive Officer, is Segment EBITDA. Segment EBITDA includes revenue and expenses that are controllable by the segment. Corporate general and administrative expenses are allocated to the segments based on usage, with shared expenses apportioned based on the segment's percentage of consolidated revenue. We calculate Segment EBITDA as EBITDA excluding restructuring and acquisition related expenses, change in fair value of contingent consideration liabilities, other gains and losses related to acquisitions, equity method investments, or divestitures, equity in losses and earnings of unconsolidated subsidiaries and impairment of goodwill. EBITDA, which is the basis for Segment EBITDA, is calculated as net income, less net income (loss) attributable to noncontrolling interest, excluding discontinued operations, depreciation, amortization, interest (which includes loss on debt extinguishment) and income tax expense. The table below provides a reconciliation of Net Income to Segment EBITDA (in thousands): Year Ended December 31, 2018 2017 2016 Net income $ 483,168 $ 530,228 $ 463,975 Less: net income (loss) attributable to noncontrolling interest 3,050 (3,516 ) — Net income attributable to LKQ stockholders 480,118 533,744 463,975 Subtract: Net (loss) income from discontinued operations (4,397 ) (6,746 ) 7,852 Net income from continuing operations attributable to LKQ stockholders 484,515 540,490 456,123 Add: Depreciation and amortization 274,213 219,546 191,433 Depreciation and amortization - cost of goods sold 19,864 10,657 6,901 Interest expense, net of interest income 144,536 100,620 87,682 Loss on debt extinguishment 1,350 456 26,650 Provision for income taxes 191,395 235,560 220,566 EBITDA 1,115,873 1,107,329 989,355 Subtract: Equity in (losses) earnings of unconsolidated subsidiaries (1) (64,471 ) 5,907 (592 ) Fair value loss on Mekonomen derivative instrument (1) (5,168 ) — — Gains on foreign exchange contracts - acquisition related (2) — — 18,342 Gains on bargain purchases (3) 2,418 3,870 8,207 Add: Restructuring and acquisition related expenses (4) 32,428 19,672 37,762 Inventory step-up adjustment - acquisition related 403 3,584 3,614 Impairment of goodwill (1) 33,244 — — Impairment of net assets held for sale 2,438 — — Change in fair value of contingent consideration liabilities (208 ) (4,218 ) 206 Segment EBITDA $ 1,251,399 $ 1,116,590 $ 1,004,980 (1) See Note 4, "Summary of Significant Accounting Policies ," for further information. (2) Reflects gains on foreign currency forwards used to fix the euro purchase price of Rhiag. See Note 2, "Business Combinations ," for further information. (3) Reflects the gains on bargain purchases related to our acquisitions of wholesale businesses in Europe and Andrew Page. See Note 2, "Business Combinations ," for further information. (4) See Note 6, "Restructuring and Acquisition Related Expenses," for further information. The following table presents capital expenditures by reportable segment (in thousands): Year Ended December 31, 2018 2017 2016 Capital Expenditures North America $ 129,391 $ 95,823 $ 91,618 Europe 99,885 71,494 77,689 Specialty 20,751 8,175 13,611 Discontinued operations — 3,598 24,156 Total capital expenditures $ 250,027 $ 179,090 $ 207,074 The following table presents assets by reportable segment (in thousands): December 31, 2018 2017 2016 Receivables, net North America $ 411,818 $ 379,666 $ 351,681 Europe (1) 649,174 555,372 443,281 Specialty 93,091 92,068 65,587 Total receivables, net (2) 1,154,083 1,027,106 860,549 Inventories North America 1,076,306 1,076,393 915,244 Europe (1) 1,410,264 964,068 718,729 Specialty 349,505 340,322 301,264 Total inventories 2,836,075 2,380,783 1,935,237 Property, Plant and Equipment, net North America 570,508 537,286 505,925 Europe (1) 562,600 293,539 247,910 Specialty 87,054 82,264 57,741 Total property, plant and equipment, net 1,220,162 913,089 811,576 Equity Method Investments North America 16,404 336 336 Europe (3) 162,765 208,068 183,131 Total equity method investments 179,169 208,404 183,467 Other unallocated assets 6,003,913 4,837,490 4,512,370 Total assets $ 11,393,402 $ 9,366,872 $ 8,303,199 (1) The increase in assets for the Europe segment is primarily attributable to the Stahlgruber acquisition. Refer to Note 2, "Business Combinations ,” for further detail on the opening balance sheet amounts. (2) Refer to "Recent Accounting Pronouncements" in Note 4, "Summary of Significant Accounting Policies ," for the increase in total receivables, net compared to December 31, 2017 as a result of the adoption of ASC 606. (3) Refer to "Investments in Unconsolidated Subsidiaries" in Note 4, "Summary of Significant Accounting Policies ," for further information. We report net receivables; inventories; net property , plant and equipment; and equity method investments by segment as that information is used by the chief operating decision maker in assessing segment performance. These assets provide a measure for the operating capital employed in each segment. Unallocated assets include cash and cash equivalents, prepaid and other current and noncurrent assets, goodwill and other intangibles. Our largest countries of operation are the U.S., followed by the U.K. and Germany. Our other European operations are located in the Netherlands, Italy, Czech Republic, Belgium, Poland, Slovakia, Austria, and other European countries. Our operations in other countries include operations in Canada, engine remanufacturing and bumper refurbishing operations in Mexico, an aftermarket parts freight consolidation warehouse in Taiwan, and administrative support functions in India. Our net sales are attributed to geographic area based on the location of the selling operation. The following table sets forth our revenue by geographic area (in thousands): Year Ended December 31, 2018 2017 2016 Revenue United States $ 6,192,636 $ 5,662,016 $ 5,226,918 United Kingdom 1,665,317 1,548,212 1,390,775 Germany 974,514 1,744 1,227 Other countries 3,044,207 2,524,937 1,965,111 Total revenue $ 11,876,674 $ 9,736,909 $ 8,584,031 The following table sets forth our tangible long-lived assets by geographic area (in thousands): December 31, 2018 2017 2016 Long-lived Assets United States $ 620,125 $ 583,236 $ 531,425 Germany 217,476 41 19 United Kingdom 165,145 178,021 159,689 Other countries 217,416 151,791 120,443 Total long-lived assets $ 1,220,162 $ 913,089 $ 811,576

Selected Quarterly Data (unaudi

Selected Quarterly Data (unaudited) (Notes)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Data [Abstract]
Quarterly Financial Information [Text Block]	Selected Quarterly Data (unaudited) The following table presents unaudited selected quarterly financial data for the two years ended December 31, 2018 . The operating results for any quarter are not necessarily indicative of the results for any future period. Quarter Ended (1) (In thousands, except per share data) Dec. 31 (2) (3) Sep. 30 (3) Jun. 30 Mar. 31 2018 Revenue $ 3,002,781 $ 3,122,378 $ 3,030,751 $ 2,720,764 Gross margin 1,161,809 1,197,198 1,161,879 1,053,971 Operating income (2) 164,146 234,733 256,794 226,568 Income from continuing operations (3) 42,456 134,480 157,866 152,763 Net loss from discontinued operations (4) (4,397 ) — — — Net income 38,059 134,480 157,866 152,763 Net income (loss) attributable to noncontrolling interest 2,010 378 859 (197 ) Net income attributable to LKQ stockholders 36,049 134,102 157,007 152,960 Basic earnings per share from continuing operations (6) $ 0.13 $ 0.42 $ 0.51 $ 0.49 Diluted earnings per share from continuing operations (6) $ 0.13 $ 0.42 $ 0.50 $ 0.49 Quarter Ended (In thousands, except per share data) Dec. 31 Sep. 30 Jun. 30 Mar. 31 2017 Revenue $ 2,469,855 $ 2,465,800 $ 2,458,411 $ 2,342,843 Gross margin 947,645 956,876 965,009 930,093 Operating income (5) 165,634 199,099 244,573 235,692 Income from continuing operations 122,870 122,381 150,914 140,809 Net loss from discontinued operations (4) (2,215 ) — — (4,531 ) Net income 120,655 122,381 150,914 136,278 Net loss attributable to noncontrolling interest (3,516 ) — — — Net income attributable to LKQ stockholders 124,171 122,381 150,914 136,278 Basic earnings per share from continuing operations (6) $ 0.40 $ 0.40 $ 0.49 $ 0.46 Diluted earnings per share from continuing operations (6) $ 0.39 $ 0.39 $ 0.49 $ 0.45 (1) The 2018 amounts presented above include the results of operations of Stahlgruber, from its acquisition effective May 30, 2018. (2) Reflects a $33 million goodwill impairment charge on the Aviation reporting unit recorded in the fourth quarter of 2018. See "Intangible Assets" in Note 4, "Summary of Significant Accounting Policies ," for further information. (3) Reflects impairment charges of $48 million and $23 million recorded in the fourth and third quarters of 2018, respectively, related to the Mekonomen equity investment. See "Investments in Unconsolidated Subsidiaries" in Note 4, "Summary of Significant Accounting Policies ," for further information. (4) In the first quarter of 2017, LKQ completed the sale of the glass manufacturing business of its PGW subsidiary and recorded a loss on sale of $4 million and an immaterial loss from discontinued operations, net of tax. During the fourth quarter of 2017, we recorded an additional loss on sale of $2 million . During the fourth quarter of 2018, we recorded a final tax expense adjustment of $4 million to the loss on sale of the glass manufacturing business of PGW. See Note 3, "Discontinued Operations" for further information regarding the disposal of the glass manufacturing business. (5) Certain amounts in the fourth quarter of 2017 have been recast to reflect the 2018 adoption of ASU 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." See "Other Recently Adopted Accounting Pronouncements" within Note 4, "Summary of Significant Accounting Policies " for further information. (6) The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in weighted average shares outstanding throughout the year.

Condensed Consolidating Financi

Condensed Consolidating Financial Information	12 Months Ended
	Dec. 31, 2018
Condensed Consolidating Financial Information [Abstract]
Condensed Financial Statements [Text Block]	Condensed Consolidating Financial Information LKQ Corporation (the "Parent") issued, and the Guarantors have fully and unconditionally guaranteed, jointly and severally, the U.S. Notes (2023) due on May 15, 2023. A Guarantor's guarantee will be unconditionally and automatically released and discharged upon the occurrence of any of the following events: (i) a transfer (including as a result of consolidation or merger) by the Guarantor to any person that is not a Guarantor of all or substantially all assets and properties of such Guarantor, provided the Guarantor is also released from its obligations with respect to indebtedness under the Credit Agreement or other indebtedness of ours, which obligation gave rise to the guarantee of the U.S. Notes (2023); (ii) a transfer (including as a result of consolidation or merger) to any person that is not a Guarantor of the equity interests of a Guarantor or issuance by a Guarantor of its equity interests such that the Guarantor ceases to be a subsidiary, as defined in the U.S. Notes (2023) Indenture, provided the Guarantor is also released from its obligations with respect to indebtedness under the Credit Agreement or other indebtedness of ours, which obligation gave rise to the guarantee of the U.S. Notes (2023); (iii) the release of the Guarantor from its obligations with respect to indebtedness under the Credit Agreement or other indebtedness of ours, which obligation gave rise to the guarantee of the U.S. Notes (2023); and (iv) upon legal defeasance, covenant defeasance or satisfaction and discharge of the U.S. Notes (2023) Indenture, as defined in the U.S. Notes (2023) Indenture. Presented below are the condensed consolidating financial statements of the Parent, the Guarantors, the non-guarantor subsidiaries (the "Non-Guarantors"), and the elimination entries necessary to present our financial statements on a consolidated basis as required by Rule 3-10 of Regulation S-X of the Securities Exchange Act of 1934 resulting from the guarantees of the U.S. Notes (2023). Investments in consolidated subsidiaries have been presented under the equity method of accounting. The principal elimination entries eliminate investments in subsidiaries, intercompany balances, and intercompany revenue and expenses. The condensed consolidating financial statements below have been prepared from our financial information on the same basis of accounting as the consolidated financial statements, and may not necessarily be indicative of the financial position, results of operations or cash flows had the Parent, Guarantors and Non-Guarantors operated as independent entities. LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Income (In thousands) Year Ended December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 6,276,951 $ 5,766,958 $ (167,235 ) $ 11,876,674 Cost of goods sold — 3,783,376 3,685,676 (167,235 ) 7,301,817 Gross margin — 2,493,575 2,081,282 — 4,574,857 Selling, general and administrative expenses 27,394 1,713,118 1,612,219 — 3,352,731 Restructuring and acquisition related expenses — 3,140 29,288 — 32,428 Impairment of goodwill — 33,244 — — 33,244 Depreciation and amortization 137 99,665 174,411 — 274,213 Operating (loss) income (27,531 ) 644,408 265,364 — 882,241 Other expense (income): Interest expense 66,794 640 78,943 — 146,377 Intercompany interest (income) expense, net (65,072 ) 40,756 24,316 — — Loss on debt extinguishment 1,350 — — — 1,350 Gains on bargain purchases — — (2,418 ) — (2,418 ) Interest income and other (income) expense, net (1,082 ) (15,586 ) 10,169 — (6,499 ) Total other expense, net 1,990 25,810 111,010 — 138,810 (Loss) income before (benefit) provision for income taxes (29,521 ) 618,598 154,354 — 743,431 (Benefit) provision for income taxes (18,600 ) 163,937 46,058 — 191,395 Equity in earnings (losses) of unconsolidated subsidiaries — 173 (64,644 ) — (64,471 ) Equity in earnings of subsidiaries 495,436 16,598 — (512,034 ) — Income from continuing operations 484,515 471,432 43,652 (512,034 ) 487,565 Net loss from discontinued operations (4,397 ) (4,397 ) — 4,397 (4,397 ) Net income 480,118 467,035 43,652 (507,637 ) 483,168 Less: net income attributable to noncontrolling interest — — 3,050 — 3,050 Net income attributable to LKQ stockholders $ 480,118 $ 467,035 $ 40,602 $ (507,637 ) $ 480,118 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Income (In thousands) Year Ended December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 5,780,904 $ 4,116,161 $ (160,156 ) $ 9,736,909 Cost of goods sold — 3,458,304 2,639,138 (160,156 ) 5,937,286 Gross margin — 2,322,600 1,477,023 — 3,799,623 Selling, general and administrative expenses 29,884 1,557,883 1,127,640 — 2,715,407 Restructuring and acquisition related expenses — 7,352 12,320 — 19,672 Depreciation and amortization 118 96,717 122,711 — 219,546 Operating (loss) income (30,002 ) 660,648 214,352 — 844,998 Other expense (income): Interest expense 66,030 546 35,064 — 101,640 Intercompany interest (income) expense, net (17,873 ) (2,383 ) 20,256 — — Loss on debt extinguishment 456 — — — 456 Gains on bargain purchases — — (3,870 ) — (3,870 ) Interest income and other expense (income), net 242 (14,323 ) (5,774 ) — (19,855 ) Total other expense (income), net 48,855 (16,160 ) 45,676 — 78,371 (Loss) income from continuing operations before provision for income taxes (78,857 ) 676,808 168,676 — 766,627 Provision for income taxes 28,684 168,288 38,588 — 235,560 Equity in earnings of unconsolidated subsidiaries — — 5,907 — 5,907 Equity in earnings of subsidiaries 648,031 21,836 — (669,867 ) — Income from continuing operations 540,490 530,356 135,995 (669,867 ) 536,974 Net (loss) income from discontinued operations (6,746 ) (6,746 ) 2,050 4,696 (6,746 ) Net income 533,744 523,610 138,045 (665,171 ) 530,228 Less: net loss attributable to noncontrolling interest — — (3,516 ) — (3,516 ) Net income attributable to LKQ stockholders $ 533,744 $ 523,610 $ 141,561 $ (665,171 ) $ 533,744 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Income (In thousands) Year Ended December 31, 2016 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 5,467,430 $ 3,301,503 $ (184,902 ) $ 8,584,031 Cost of goods sold — 3,313,503 2,103,727 (184,902 ) 5,232,328 Gross margin — 2,153,927 1,197,776 — 3,351,703 Selling, general and administrative expenses 34,163 1,450,588 874,359 — 2,359,110 Restructuring and acquisition related expenses — 21,162 16,600 — 37,762 Depreciation and amortization 132 94,165 97,136 — 191,433 Operating (loss) income (34,295 ) 588,012 209,681 — 763,398 Other expense (income): Interest expense 59,415 547 28,301 — 88,263 Intercompany interest (income) expense, net (27,470 ) 17,124 10,346 — — Loss on debt extinguishment 2,894 — 23,756 — 26,650 Gains on foreign exchange contracts - acquisition related (18,342 ) — — — (18,342 ) Gains on bargain purchase — — (8,207 ) — (8,207 ) Interest income and other expense (income), net 470 (3,773 ) 1,056 — (2,247 ) Total other expense, net 16,967 13,898 55,252 — 86,117 (Loss) income from continuing operations before (benefit) provision for income taxes (51,262 ) 574,114 154,429 — 677,281 (Benefit) provision for income taxes (20,498 ) 213,794 27,270 — 220,566 Equity in (loss) earnings of unconsolidated subsidiaries (795 ) — 203 — (592 ) Equity in earnings of subsidiaries 487,682 22,314 — (509,996 ) — Income from continuing operations 456,123 382,634 127,362 (509,996 ) 456,123 Net income from discontinued operations 7,852 7,852 3,285 (11,137 ) 7,852 Net income $ 463,975 $ 390,486 $ 130,647 $ (521,133 ) $ 463,975 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Comprehensive Income (In thousands) Year Ended December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 480,118 $ 467,035 $ 43,652 $ (507,637 ) $ 483,168 Less: net income attributable to noncontrolling interest — — 3,050 — 3,050 Net income attributable to LKQ stockholders 480,118 467,035 40,602 (507,637 ) 480,118 Other comprehensive (loss) income: Foreign currency translation, net of tax (108,523 ) (8,628 ) (75,462 ) 84,090 (108,523 ) Net change in unrealized gains/losses on cash flow hedges, net of tax 350 — — — 350 Net change in unrealized gains/losses on pension plans, net of tax 697 1,266 (569 ) (697 ) 697 Net change in other comprehensive loss from unconsolidated subsidiaries (2,343 ) — (2,343 ) 2,343 (2,343 ) Other comprehensive loss (109,819 ) (7,362 ) (78,374 ) 85,736 (109,819 ) Comprehensive income (loss) 370,299 459,673 (34,722 ) (421,901 ) 373,349 Less: comprehensive income attributable to noncontrolling interest — — 3,050 — 3,050 Comprehensive income (loss) attributable to LKQ stockholders $ 370,299 $ 459,673 $ (37,772 ) $ (421,901 ) $ 370,299 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Comprehensive Income (In thousands) Year Ended December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 533,744 $ 523,610 $ 138,045 $ (665,171 ) $ 530,228 Less: net loss attributable to noncontrolling interest — — (3,516 ) — (3,516 ) Net income attributable to LKQ stockholders 533,744 523,610 141,561 (665,171 ) 533,744 Other comprehensive income (loss): Foreign currency translation, net of tax 200,596 16,743 206,049 (222,792 ) 200,596 Net change in unrealized gains/losses on cash flow hedges, net of tax 3,447 (133 ) — 133 3,447 Net change in unrealized gains/losses on pension plans, net of tax (6,035 ) (3,254 ) (2,781 ) 6,035 (6,035 ) Net change in other comprehensive loss from unconsolidated subsidiaries (1,309 ) — (1,309 ) 1,309 (1,309 ) Other comprehensive income 196,699 13,356 201,959 (215,315 ) 196,699 Comprehensive income 730,443 536,966 340,004 (880,486 ) 726,927 Less: comprehensive loss attributable to noncontrolling interest — — (3,516 ) — (3,516 ) Comprehensive income attributable to LKQ stockholders $ 730,443 $ 536,966 $ 343,520 $ (880,486 ) $ 730,443 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Comprehensive Income (In thousands) Year Ended December 31, 2016 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 463,975 $ 390,486 $ 130,647 $ (521,133 ) $ 463,975 Other comprehensive (loss) income: Foreign currency translation, net of tax (175,639 ) (48,914 ) (177,911 ) 226,825 (175,639 ) Net change in unrecognized gains/losses on cash flow hedges, net of tax 9,023 133 389 (522 ) 9,023 Net change in unrealized gains/losses on pension plans, net of tax 4,911 3,962 1,061 (5,023 ) 4,911 Total other comprehensive loss (161,705 ) (44,819 ) (176,461 ) 221,280 (161,705 ) Total comprehensive income (loss) $ 302,270 $ 345,667 $ (45,814 ) $ (299,853 ) $ 302,270 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Balance Sheets (In thousands) December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 25,633 $ 29,285 $ 276,843 $ — $ 331,761 Receivables, net 310 316,726 837,047 — 1,154,083 Intercompany receivables, net 6,978 — 12,880 (19,858 ) — Inventories — 1,343,612 1,492,463 — 2,836,075 Prepaid expenses and other current assets 18,611 99,356 81,063 — 199,030 Total current assets 51,532 1,788,979 2,700,296 (19,858 ) 4,520,949 Property, plant and equipment, net 1,547 600,054 618,561 — 1,220,162 Intangible assets: Goodwill — 1,973,364 2,408,094 — 4,381,458 Other intangibles, net 260 272,451 656,041 — 928,752 Investment in subsidiaries 5,224,006 111,826 — (5,335,832 ) — Intercompany notes receivable 1,220,582 10,515 — (1,231,097 ) — Equity method investments — 16,404 162,765 — 179,169 Other assets 70,283 40,548 52,081 — 162,912 Total assets $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 2,454 $ 343,116 $ 596,828 $ — $ 942,398 Intercompany payables, net — 12,880 6,978 (19,858 ) — Accrued expenses: Accrued payroll-related liabilities 6,652 70,267 95,086 — 172,005 Other accrued expenses 5,454 105,672 177,299 — 288,425 Refund liability — 50,899 53,686 — 104,585 Other current liabilities 283 17,860 42,966 — 61,109 Current portion of long-term obligations 8,459 2,932 110,435 — 121,826 Total current liabilities 23,302 603,626 1,083,278 (19,858 ) 1,690,348 Long-term obligations, excluding current portion 1,628,677 13,532 2,546,465 — 4,188,674 Intercompany notes payable — 597,283 633,814 (1,231,097 ) — Deferred income taxes 8,045 135,355 168,034 — 311,434 Other noncurrent liabilities 125,888 99,147 139,159 — 364,194 Stockholders' equity: Total Company stockholders’ equity 4,782,298 3,365,198 1,970,634 (5,335,832 ) 4,782,298 Noncontrolling interest — — 56,454 — 56,454 Total stockholders’ equity 4,782,298 3,365,198 2,027,088 (5,335,832 ) 4,838,752 Total liabilities and stockholders' equity $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Balance Sheets (In thousands) December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 34,360 $ 35,131 $ 210,275 $ — $ 279,766 Receivables, net — 290,958 736,148 — 1,027,106 Intercompany receivables, net 2,669 3,010 230 (5,909 ) — Inventories — 1,334,766 1,046,017 — 2,380,783 Prepaid expenses and other current assets 34,136 44,849 55,494 — 134,479 Total current assets 71,165 1,708,714 2,048,164 (5,909 ) 3,822,134 Property, plant and equipment, net 910 563,262 348,917 — 913,089 Intangible assets: Goodwill — 2,010,209 1,526,302 — 3,536,511 Other intangibles, net — 291,036 452,733 — 743,769 Investment in subsidiaries 5,952,687 102,931 — (6,055,618 ) — Intercompany notes receivable 1,156,550 782,638 — (1,939,188 ) — Equity method investments — 336 208,068 — 208,404 Other assets 70,590 33,597 38,778 — 142,965 Total assets $ 7,251,902 $ 5,492,723 $ 4,622,962 $ (8,000,715 ) $ 9,366,872 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 5,742 $ 340,951 $ 441,920 $ — $ 788,613 Intercompany payables, net — 230 5,679 (5,909 ) — Accrued expenses: Accrued payroll-related liabilities 9,448 65,811 68,165 — 143,424 Other accrued expenses 5,219 95,900 117,481 — 218,600 Other current liabilities 282 27,066 18,379 — 45,727 Current portion of long-term obligations 16,468 1,912 107,980 — 126,360 Total current liabilities 37,159 531,870 759,604 (5,909 ) 1,322,724 Long-term obligations, excluding current portion 2,095,826 7,372 1,174,422 — 3,277,620 Intercompany notes payable 750,000 677,708 511,480 (1,939,188 ) — Deferred income taxes 12,402 116,021 123,936 — 252,359 Other noncurrent liabilities 158,346 101,189 47,981 — 307,516 Stockholders' equity: Total Company stockholders’ equity 4,198,169 4,058,563 1,997,055 (6,055,618 ) 4,198,169 Noncontrolling interest — — 8,484 — 8,484 Total stockholders’ equity 4,198,169 4,058,563 2,005,539 (6,055,618 ) 4,206,653 Total liabilities and stockholders' equity $ 7,251,902 $ 5,492,723 $ 4,622,962 $ (8,000,715 ) $ 9,366,872 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Cash Flows (In thousands) Year Ended December 31, 2018 Parent Guarantors Non-Guarantors (1) Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 481,138 $ 277,595 $ 111,213 $ (159,207 ) $ 710,739 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (848 ) (136,033 ) (113,146 ) — (250,027 ) Proceeds from disposals of property, plant and equipment — 22,393 5,266 — 27,659 Investment and intercompany note activity with subsidiaries (97,261 ) — — 97,261 — Return of investment in subsidiaries 143,524 — — (143,524 ) — Acquisitions, net of cash and restricted cash acquired — (8,217 ) (1,206,778 ) — (1,214,995 ) Investments in unconsolidated subsidiaries — (12,216 ) (48,084 ) — (60,300 ) Receipts of deferred purchase price on receivables under factoring arrangements — 317,091 36,991 (317,091 ) 36,991 Other investing activities, net 887 180 666 — 1,733 Net cash provided by (used in) investing activities 46,302 183,198 (1,325,085 ) (363,354 ) (1,458,939 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 5,303 — — — 5,303 Taxes paid related to net share settlements of stock-based compensation awards (5,567 ) — — — (5,567 ) Debt issuance costs (5,434 ) — (15,694 ) — (21,128 ) Proceeds from issuance of Euro Notes (2026/28) — — 1,232,100 — 1,232,100 Purchase of treasury stock (60,000 ) — — — (60,000 ) Borrowings under revolving credit facilities 765,632 — 901,693 — 1,667,325 Repayments under revolving credit facilities (884,863 ) — (644,107 ) — (1,528,970 ) Repayments under term loans (354,800 ) — — — (354,800 ) Borrowings under receivables securitization facility — — 10,120 — 10,120 Repayments under receivables securitization facility — — (120 ) — (120 ) Payment of assumed debt and notes issued from acquisitions — — (54,888 ) — (54,888 ) Repayments of other debt, net (385 ) (3,636 ) (7,709 ) — (11,730 ) Other financing activities, net 3,947 — 1,403 — 5,350 Investment and intercompany note activity with parent — (68,435 ) 165,696 (97,261 ) — Dividends — (392,883 ) (226,939 ) 619,822 — Net cash (used in) provided by financing activities (536,167 ) (464,954 ) 1,361,555 522,561 882,995 Effect of exchange rate changes on cash, cash equivalents and restricted cash — (1,685 ) (75,626 ) — (77,311 ) Net (decrease) increase in cash, cash equivalents and restricted cash (8,727 ) (5,846 ) 72,057 — 57,484 Cash, cash equivalents and restricted cash, beginning of period 34,360 35,131 210,275 — 279,766 Cash, cash equivalents and restricted cash, end of period $ 25,633 $ 29,285 $ 282,332 $ — $ 337,250 (1) Restricted cash is only included in the condensed consolidating financial statements of the Non-Guarantors LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Cash Flows (In thousands) Year Ended December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 243,011 $ 186,459 $ 95,617 $ (6,187 ) $ 518,900 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (648 ) (87,102 ) (91,340 ) — (179,090 ) Proceeds from disposals of property, plant and equipment — 6,490 2,217 — 8,707 Investment and intercompany note activity with subsidiaries 57,735 — — (57,735 ) — Acquisitions, net of cash acquired — (335,582 ) (177,506 ) — (513,088 ) Proceeds from disposals of business/investment — 305,740 (4,443 ) — 301,297 Investments in unconsolidated subsidiaries — (2,750 ) (4,914 ) — (7,664 ) Receipts of deferred purchase price on receivables under factoring arrangements (1) — 294,925 — (294,925 ) — Other investing activities, net — — 5,243 — 5,243 Net cash provided by (used in) investing activities 57,087 181,721 (270,743 ) (352,660 ) (384,595 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 7,470 — — — 7,470 Taxes paid related to net share settlements of stock-based compensation awards (5,525 ) — — — (5,525 ) Debt issuance costs (4,267 ) — — — (4,267 ) Borrowings under revolving credit facilities 558,000 — 281,171 — 839,171 Repayments under revolving credit facilities (824,862 ) — (121,615 ) — (946,477 ) Repayments under term loans (27,884 ) — — — (27,884 ) Borrowings under receivables securitization facility — — 11,245 — 11,245 Repayments under receivables securitization facility — — (11,245 ) — (11,245 ) (Repayments) borrowings of other debt, net (1,700 ) (1,318 ) 22,724 — 19,706 Other financing activities, net — (1,336 ) 6,575 — 5,239 Investment and intercompany note activity with parent — (65,498 ) 7,763 57,735 — Dividends — (301,112 ) — 301,112 — Net cash (used in) provided by financing activities (298,768 ) (369,264 ) 196,618 358,847 (112,567 ) Effect of exchange rate changes on cash and cash equivalents — 706 22,806 — 23,512 Net increase (decrease) in cash and cash equivalents 1,330 (378 ) 44,298 — 45,250 Cash and cash equivalents of continuing operations, beginning of period 33,030 35,360 159,010 — 227,400 Add: Cash and cash equivalents of discontinued operations, beginning of period — 149 6,967 — 7,116 Cash and cash equivalents of continuing and discontinued operations, beginning of period 33,030 35,509 165,977 — 234,516 Cash and cash equivalents, end of period $ 34,360 $ 35,131 $ 210,275 $ — $ 279,766 (1) Reflects the impact of adopting ASU 2016-15 LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Cash Flows (In thousands) Year Ended December 31, 2016 Parent Guarantors Non-Guarantors Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 308,299 $ 149,785 $ 99,894 $ 77,036 $ 635,014 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (36 ) (120,761 ) (86,277 ) — (207,074 ) Proceeds from disposals of property, plant and equipment 3 1,953 1,554 — 3,510 Investment and intercompany note activity with subsidiaries (1,720,732 ) — — 1,720,732 — Acquisitions, net of cash acquired — (685,278 ) (664,061 ) — (1,349,339 ) Proceeds from disposal of business/investment — — 10,304 — 10,304 Investments in unconsolidated subsidiaries — (4,400 ) (181,271 ) — (185,671 ) Receipts of deferred purchase price on receivables under factoring arrangements (1) — 389,533 — (389,533 ) — Proceeds from foreign exchange contracts 18,342 — — — 18,342 Net cash used in investing activities (1,702,423 ) (418,953 ) (919,751 ) 1,331,199 (1,709,928 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 7,963 — — — 7,963 Taxes paid related to net share settlements of stock-based compensation awards (4,438 ) — — — (4,438 ) Debt issuance costs (7,104 ) — (9,450 ) — (16,554 ) Proceeds from issuance of Euro Notes (2024) — — 563,450 — 563,450 Borrowings under revolving credit facilities 1,744,408 — 892,188 — 2,636,596 Repayments under revolving credit facilities (654,000 ) — (1,094,664 ) — (1,748,664 ) Borrowings under term loans 332,954 — 249,161 — 582,115 Repayments under term loans (10,898 ) — (244,894 ) — (255,792 ) Borrowings under receivables securitization facility — — 106,400 — 106,400 Repayments under receivables securitization facility — — (69,400 ) — (69,400 ) Borrowings (repayments) of other debt, net 653 (2,935 ) (28,874 ) — (31,156 ) Payments of Rhiag debt and related payments — — (543,347 ) — (543,347 ) Other financing activities, net — (1,436 ) — — (1,436 ) Investment and intercompany note activity with parent — 608,270 1,112,462 (1,720,732 ) — Dividends — (312,497 ) — 312,497 — Net cash provided by financing activities 1,409,538 291,402 933,032 (1,408,235 ) 1,225,737 Effect of exchange rate changes on cash and cash equivalents — (157 ) (3,547 ) — (3,704 ) Net increase in cash and cash equivalents 15,414 22,077 109,628 — 147,119 Cash and cash equivalents of continuing operations, beginning of period 17,616 13,432 56,349 — 87,397 Cash and cash equivalents of continuing and discontinued operations, end of period 33,030 35,509 165,977 — 234,516 Less: Cash and cash equivalents of discontinued operations, end of period — (149 ) (6,967 ) — (7,116 ) Cash and cash equivalents, end of period $ 33,030 $ 35,360 $ 159,010 $ — $ 227,400 (1) Reflects the impact of adopting ASU 2016-15

Schedule II - Valuation and Qua

Schedule II - Valuation and Qualifying Accounts and Reserves (Notes)	12 Months Ended
	Dec. 31, 2018
Schedule II - Valuation and Qualifying Accounts and Reserves [Abstract]
Valuation Allowances and Reserves, Balance	EXHIBITS AND FINANCIAL STATEMENT SCHEDULES (a)(1) Financial Statements Reference is made to the information set forth in Part II, Item 8 of this Annual Report on Form 10-K, which information is incorporated herein by reference. (a)(2) Financial Statement Schedules Other than as set forth below, all schedules for which provision is made in the applicable accounting regulations of the SEC have been omitted because they are not required under the related instructions, are not applicable, or the information has been provided in the consolidated financial statements or the notes thereto. Schedule II—Valuation and Qualifying Accounts and Reserves (in thousands) Description Balance at Additions Deductions Acquisitions and Balance at End ALLOWANCE FOR DOUBTFUL ACCOUNTS: Year ended December 31, 2018 $ 57,609 $ 13,970 $ (15,945 ) $ 1,573 $ 57,207 Year ended December 31, 2017 45,608 15,387 (13,012 ) 9,626 57,609 Year ended December 31, 2016 24,583 13,280 (21,829 ) 29,574 45,608 ALLOWANCE FOR ESTIMATED RETURNS, DISCOUNTS & ALLOWANCES: (1) Year ended December 31, 2017 38,345 1,885,517 (1,884,250 ) 2,713 42,325 Year ended December 31, 2016 32,774 1,670,911 (1,673,040 ) 7,700 38,345 (1) Subsequent to our adoption of ASC 606 in 2018, we present a refund liability and a returns asset within the Consolidated Balance Sheet, whereas in periods prior to adoption, we presented the estimated margin impact of expected returns as a contra-asset within accounts receivable. See Note 4, "Summary of Significant Accounting Policies," to the consolidated financial statements in Part II, Item 8 of this Annual Report on Form 10-K for additional information related to our adoption of ASC 606.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Schedule of Goodwill [Table Text Block]	Intangible Assets Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete. Goodwill is tested for impairment at least annually, and we performed annual impairment tests during the fourth quarters of 2018 , 2017 and 2016 . Goodwill impairment testing may also be performed on an interim basis when events or circumstances arise that may lead to impairment. The fair value estimates of our reporting units are established using weightings of the results of a discounted cash flow methodology and a comparative market multiples approach. Based on our annual goodwill impairment test in the fourth quarter of 2018, we determined the carrying value of our Aviation reporting unit exceeded the fair value estimate by more than the carrying value, thus we recorded an impairment charge of $33 million , which represented the total carrying value of goodwill in our Aviation reporting unit. The impairment charge was due to a decrease in the fair value estimate from the prior year fair value estimate, primarily driven by a significant deterioration in the outlook for the Aviation reporting unit due to competition, customer financial issues and changing market conditions for the airplane platforms that the business services, which lowered our projected gross margin and related future cash flows. We reported the impairment charge in Impairment of goodwill on the Consolidated Statements of Income for the year ended December 31, 2018. We determined no other impairments existed when we performed our annual impairment testing on the remaining reporting units as all those reporting units had a fair value estimate which exceeded the carrying value by at least approximately 15% , the level at which our Europe reporting unit exceeded its carrying value. The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands): North America Europe Specialty Total Balance as of January 1, 2016 $ 1,433,499 $ 594,482 $ 291,265 $ 2,319,246 Business acquisitions and adjustments to previously recorded goodwill 226,483 614,437 1,889 842,809 Exchange rate effects 1,818 (108,943 ) (161 ) (107,286 ) Balance as of December 31, 2016 $ 1,661,800 $ 1,099,976 $ 292,993 $ 3,054,769 Business acquisitions and adjustments to previously recorded goodwill 39,836 155,366 119,615 314,817 Exchange rate effects 7,718 159,556 (349 ) 166,925 Balance as of December 31, 2017 $ 1,709,354 $ 1,414,898 $ 412,259 $ 3,536,511 Business acquisitions and adjustments to previously recorded goodwill 6,805 970,923 (4,838 ) 972,890 Impairment of goodwill (33,244 ) — — (33,244 ) Exchange rate effects (9,383 ) (85,532 ) 216 (94,699 ) Balance as of December 31, 2018 $ 1,673,532 $ 2,300,289 $ 407,637 $ 4,381,458 Accumulated impairment losses as of December 31, 2018 $ (33,244 ) $ — $ — $ (33,244 ) During the year ended December 31, 2018, we recorded $908 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions.
Rental Expense [Policy Text Block]	Rental Expense We recognize rental expense on a straight-line basis over the respective lease terms, including reasonably assured renewal periods, for all of our operating leases.
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign Currency Translation For most of our foreign operations, the local currency is the functional currency. Assets and liabilities are translated into U.S. dollars at the period-ending exchange rate. Statements of Income amounts are translated to U.S. dollars using monthly average exchange rates during the period. Translation gains and losses are reported as a component of Accumulated other comprehensive income (loss) in stockholders' equity.
Income Tax, Policy [Policy Text Block]	Income Taxes Current income taxes are provided on income reported for financial reporting purposes, adjusted for transactions that do not enter into the computation of income taxes payable in the same year. Deferred income taxes have been provided to show the effect of temporary differences between the tax bases of assets and liabilities and their reported amounts in the financial statements. A valuation allowance is provided for deferred tax assets if it is more likely than not that these items will either expire before we are able to realize their benefit or that future deductibility is uncertain. Provision is made for taxes on undistributed earnings of foreign subsidiaries and related companies to the extent that such earnings are not deemed to be permanently invested. We recognize the benefits of uncertain tax positions taken or expected to be taken in tax returns in the provision for income taxes only for those positions that are more likely than not to be realized. We follow a two-step approach to recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if the weight of available evidence indicates it is more likely than not that the position will be sustained on audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement. We consider many factors when evaluating and estimating our tax positions and tax benefits, which may require periodic adjustments and which may not accurately forecast actual outcomes. Our policy is to include interest and penalties associated with income tax obligations in income tax expense. During 2017, new tax legislation was signed into law making significant changes to the Internal Revenue Code. See Note 15, "Income Taxes" for further information regarding the new tax law.
Stockholders' Equity, Policy [Policy Text Block]	Stockholders' Equity On October 25, 2018, our Board of Directors authorized a stock repurchase program under which we may purchase up to $500 million of our common stock from time to time through October 25, 2021. Repurchases under the program may be made in the open market or in privately negotiated transactions, with the amount and timing of repurchases depending on market conditions and corporate needs. The repurchase program does not obligate us to acquire any specific number of shares and may be suspended or discontinued at any time. Delaware law imposes restrictions on stock repurchases. During 2018, we repurchased 2.3 million shares of common stock for an aggregate price $60 million . As of December 31, 2018, there is $440 million of remaining capacity under our repurchase program. In 2019, we have repurchased 1.8 million shares of common stock for an aggregate purchase price of $46 million during the period ended February 22, 2019. Treasury stock is accounted for using the cost method.
Self Insurance Reserve [Policy Text Block]	Self-Insurance Reserves We self-insure a portion of employee medical benefits under the terms of our employee health insurance program. We purchase certain stop-loss insurance to limit our liability exposure. We also self-insure a portion of our property and casualty risk, which includes automobile liability, general liability, directors and officers liability, workers' compensation, and property coverage, under deductible insurance programs. The insurance premium costs are expensed over the contract periods. A reserve for liabilities associated with these losses is established for claims filed and claims incurred but not yet reported based upon our estimate of ultimate cost, which is calculated using analysis of historical data. We monitor new claims and claim development as well as trends related to the claims incurred but not reported in order to assess the adequacy of our insurance reserves. Total self-insurance reserves were $105 million and $94 million , of which $52 million and $43 million was classified as current, as of December 31, 2018 and 2017 , respectively, and are classified as Other accrued expenses in the Consolidated Balance Sheets. The remaining balances of self-insurance reserves are classified as Other noncurrent liabilities, which reflects management's estimates of when claims will be paid. We had outstanding letters of credit of $65 million and $71 million at December 31, 2018 and 2017 , respectively, to guarantee self-insurance claims payments. While we do not expect the amounts ultimately paid to differ significantly from our estimates, our insurance reserves and corresponding expenses could be affected if future claims experience differs significantly from historical trends and assumptions.
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of Long-Lived Assets Long-lived assets are reviewed for possible impairment whenever events or circumstances indicate that the carrying amount of such assets may not be recoverable. If such review indicates that the carrying amount of long-lived assets is not recoverable, the carrying amount of such assets is reduced to fair value. Other than the impairment recorded upon recognition of the PGW glass manufacturing business net assets as held for sale as discussed in Note 3, "Discontinued Operations ," there were no material adjustments to the carrying value of long-lived assets during the years ended December 31, 2018 , 2017 or 2016 .
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentrations of Credit Risk Financial instruments that potentially subject us to significant concentration of credit risk consist primarily of cash and cash equivalents and accounts receivable. We control our exposure to credit risk associated with these instruments by (i) placing our cash and cash equivalents with several major financial institutions; (ii) holding high-quality financial instruments; and (iii) maintaining strict policies over credit extension that include credit evaluations, credit limits and monitoring procedures. In addition, our overall credit risk with respect to accounts receivable is limited to some extent because our customer base is composed of a large number of geographically diverse customers.
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The accompanying consolidated financial statements include the accounts of LKQ Corporation and its subsidiaries. All intercompany transactions and accounts have been eliminated.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates In preparing our financial statements in conformity with accounting principles generally accepted in the United States of America, we are required to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.
Cost of Goods Sold [Policy Text Block]	Cost of Goods Sold Our cost of goods sold includes: the price we pay for inventory, net of vendor discounts, rebates or other incentives; inbound freight and other transportation costs to bring inventory into our facilities; and overhead costs related to purchasing, warehousing and transporting our products from our distribution warehouses to our selling locations. For our salvage, remanufactured, and refurbished products, our cost of goods sold also includes direct and indirect labor, equipment costs, depreciation, and other overhead to transform inventory into finished products suitable for sale. Cost of goods sold also includes expenses for our service-type warranties and for our assurance-type warranty programs. See Note 5, "Revenue Recognition" for additional information related to our warranty programs.
Selling, General and Administrative Expenses, Policy [Policy Text Block]	Selling, General and Administrative Expenses Selling, general and administrative expenses include: personnel costs for employees in selling, general and administrative functions; costs to operate our branch locations, corporate offices and back office support centers; costs to transport our products from our facilities to our customers; and other selling, general and administrative expenses, such as professional fees, supplies, and advertising expenses. The costs included in selling, general and administrative expenses do not relate to inventory processing or conversion activities, and, as such, are classified below the gross margin line on our Consolidated Statements of Income.
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents include cash on hand, operating accounts, and deposits readily convertible to known amounts of cash. Restricted cash includes cash for which the Company's ability to withdraw funds at any time is contractually limited. As of December 31, 2018, we have $5 million of restricted cash that is recorded in Other assets on the Consolidated Balance Sheets.
Receivables and Allowance for Doubtful Accounts	Receivables and Allowance for Doubtful Accounts In the normal course of business, we extend credit to customers after a review of each customer's credit history. We recorded a reserve for uncollectible accounts of approximately $57 million and $58 million at December 31, 2018 and 2017 , respectively. Our May 2018 acquisition of Stahlgruber contributed $3 million to our reserve for uncollectible accounts. See Note 2, "Business Combinations" for further information on our acquisitions. The reserve is based upon the aging of the accounts receivable, our assessment of the collectability of specific customer accounts and historical experience. Receivables are written off once collection efforts have been exhausted. Recoveries of receivables previously written off are recorded when received.
Inventory	Inventories We classify our inventory into the following categories: (i) aftermarket and refurbished products, (ii) salvage and remanufactured products, and (iii) manufactured products. An aftermarket product is a new vehicle product manufactured by a company other than the original equipment manufacturer. For all of our aftermarket products, excluding our aftermarket automotive glass products, cost is established based on the average price we pay for parts; for our aftermarket automotive glass products inventory, cost is established using the first-in first-out method. Inventory cost for all of our aftermarket products includes expenses incurred for freight in and overhead costs; for items purchased from foreign companies, import fees and duties and transportation insurance are also included. Refurbished products are parts that require cosmetic repairs, such as wheels, bumper covers and lights; LKQ will apply new parts, products or materials to these parts in order to produce the finished product. Refurbished inventory cost is based upon the average price we pay for cores. The cost of our refurbished inventory also includes expenses incurred for freight in, labor and other overhead costs. A salvage product is a recycled vehicle part suitable for sale as a replacement part. Cost is established based upon the price we pay for a vehicle, including auction, storage and towing fees, as well as expenditures for buying and dismantling the vehicle. Inventory carrying value is determined using the average cost to sales percentage at each of our facilities and applying that percentage to the facility's inventory at expected selling prices, the assessment of which incorporates the sales probability based on a part's number of days in stock and historical demand. The average cost to sales percentage is derived from each facility's historical profitability for salvage vehicles. Remanufactured products are used parts that have been inspected, rebuilt, or reconditioned to restore functionality and performance, such as remanufactured engines and transmissions. Remanufactured inventory cost is based upon the price paid for cores, which are recycled automotive parts that are not suitable for sale as a replacement part without further processing, and also includes expenses incurred for freight in, direct manufacturing costs and other overhead costs. A manufactured product is a new vehicle product. Manufactured product inventory can be a raw material, work-in-process or finished good. Cost is established using the first-in first-out method. For all inventory, carrying value is recorded at the lower of cost or net realizable value and is reduced to reflect current anticipated demand. If actual demand is lower than our estimates, additional reductions to inventory carrying value would be necessary in the period such determination is made. Inventories consist of the following (in thousands): December 31, 2018 2017 Aftermarket and refurbished products $ 2,309,458 $ 1,877,653 Salvage and remanufactured products 503,199 487,108 Manufactured products 23,418 16,022 Total inventories $ 2,836,075 $ 2,380,783 Aftermarket and refurbished products and salvage and remanufactured products are primarily composed of finished goods. As of December 31, 2018, manufactured products inventory was composed of $17 million of raw materials, $2 million of work in process, and $4 million of finished goods. As of December 31, 2017, manufactured products inventory was composed of $10 million of raw materials, $2 million of work in process, and $4 million of finished goods. Our May 2018 acquisition of Stahlgruber contributed $380 million to our aftermarket and refurbished products inventory as of the acquisition date. See Note 2, "Business Combinations" for further information on our acquisitions.
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment Property, plant and equipment are recorded at cost less accumulated depreciation. Expenditures for major additions and improvements that extend the useful life of the related asset are capitalized. As property, plant and equipment are sold or retired, the applicable cost and accumulated depreciation are removed from the accounts and any resulting gain or loss thereon is recognized. Construction in progress consists primarily of building and land improvements at our existing facilities. Depreciation is calculated using the straight-line method over the estimated useful lives or, in the case of leasehold improvements, the term of the related lease and reasonably assured renewal periods, if shorter. Our estimated useful lives are as follows: Land improvements 10-20 years Buildings and improvements 20-40 years Machinery and equipment 3-20 years Computer equipment and software 3-10 years Vehicles and trailers 3-10 years Furniture and fixtures 5-7 years Property, plant and equipment consists of the following (in thousands): December 31, 2018 2017 Land and improvements $ 177,998 $ 137,790 Buildings and improvements 378,490 233,078 Machinery and equipment 626,615 521,526 Computer equipment and software 143,547 133,753 Vehicles and trailers 176,186 161,269 Furniture and fixtures 58,919 31,794 Leasehold improvements 278,687 257,506 1,840,442 1,476,716 Less—Accumulated depreciation (685,751 ) (606,112 ) Construction in progress 65,471 42,485 Total property, plant and equipment, net $ 1,220,162 $ 913,089 The components of opening property, plant and equipment acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands): Gross Amount Land and improvements $ 47,281 Buildings and improvements 135,628 Machinery and equipment 49,384 Computer equipment and software 3,760 Vehicles and trailers 643 Furniture and fixtures 30,426 Leasehold improvements 1,890 269,012 Construction in progress 2,280 Total property, plant and equipment $ 271,292 We record depreciation expense associated with our refurbishing, remanufacturing, manufacturing and furnace operations as well as our distribution centers in Cost of goods sold on the Consolidated Statements of Income. All other depreciation expense is reported in Depreciation and amortization. Total depreciation expense for the years ended December 31, 2018, 2017, and 2016 was $157 million , $129 million , and $115 million , respectively.
Intangible Assets	Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete. Goodwill is tested for impairment at least annually, and we performed annual impairment tests during the fourth quarters of 2018 , 2017 and 2016 . Goodwill impairment testing may also be performed on an interim basis when events or circumstances arise that may lead to impairment. The fair value estimates of our reporting units are established using weightings of the results of a discounted cash flow methodology and a comparative market multiples approach. Based on our annual goodwill impairment test in the fourth quarter of 2018, we determined the carrying value of our Aviation reporting unit exceeded the fair value estimate by more than the carrying value, thus we recorded an impairment charge of $33 million , which represented the total carrying value of goodwill in our Aviation reporting unit. The impairment charge was due to a decrease in the fair value estimate from the prior year fair value estimate, primarily driven by a significant deterioration in the outlook for the Aviation reporting unit due to competition, customer financial issues and changing market conditions for the airplane platforms that the business services, which lowered our projected gross margin and related future cash flows. We reported the impairment charge in Impairment of goodwill on the Consolidated Statements of Income for the year ended December 31, 2018. We determined no other impairments existed when we performed our annual impairment testing on the remaining reporting units as all those reporting units had a fair value estimate which exceeded the carrying value by at least approximately 15% , the level at which our Europe reporting unit exceeded its carrying value. The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands): North America Europe Specialty Total Balance as of January 1, 2016 $ 1,433,499 $ 594,482 $ 291,265 $ 2,319,246 Business acquisitions and adjustments to previously recorded goodwill 226,483 614,437 1,889 842,809 Exchange rate effects 1,818 (108,943 ) (161 ) (107,286 ) Balance as of December 31, 2016 $ 1,661,800 $ 1,099,976 $ 292,993 $ 3,054,769 Business acquisitions and adjustments to previously recorded goodwill 39,836 155,366 119,615 314,817 Exchange rate effects 7,718 159,556 (349 ) 166,925 Balance as of December 31, 2017 $ 1,709,354 $ 1,414,898 $ 412,259 $ 3,536,511 Business acquisitions and adjustments to previously recorded goodwill 6,805 970,923 (4,838 ) 972,890 Impairment of goodwill (33,244 ) — — (33,244 ) Exchange rate effects (9,383 ) (85,532 ) 216 (94,699 ) Balance as of December 31, 2018 $ 1,673,532 $ 2,300,289 $ 407,637 $ 4,381,458 Accumulated impairment losses as of December 31, 2018 $ (33,244 ) $ — $ — $ (33,244 ) During the year ended December 31, 2018, we recorded $908 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions. The components of other intangibles, net are as follows (in thousands): December 31, 2018 December 31, 2017 Intangible assets subject to amortization $ 847,452 $ 664,969 Indefinite-lived intangible assets Trademarks 81,300 78,800 Total $ 928,752 $ 743,769 The components of intangible assets subject to amortization are as follows (in thousands): December 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trade names and trademarks $ 496,166 $ (94,451 ) $ 401,715 $ 327,332 $ (75,095 ) $ 252,237 Customer and supplier relationships 593,517 (247,464 ) 346,053 510,113 (167,532 ) 342,581 Software and other technology related assets 176,118 (79,283 ) 96,835 124,049 (59,081 ) 64,968 Covenants not to compete 13,344 (10,495 ) 2,849 14,981 (9,798 ) 5,183 Total $ 1,279,145 $ (431,693 ) $ 847,452 $ 976,475 $ (311,506 ) $ 664,969 The components of intangible assets acquired as part of our acquisitions in 2018 are as follows (in thousands): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions (1) Total All Acquisitions Trade names and trademarks $ 173,946 $ 8,870 $ 182,816 $ 87,306 Customer and supplier relationships 77,980 20,779 98,759 75,450 Software and other technology related assets 33,329 376 33,705 15,757 Covenants not to compete — — — 2,703 Total $ 285,255 $ 30,025 $ 315,280 $ 181,216 (1) The amounts recorded during the year ended December 31, 2018 exclude amounts related to our 2017 acquisitions, including a $5 million adjustment to increase other intangibles related to our 2017 acquisition of Warn. The weighted-average amortization periods for our intangible assets acquired during the years ended December 31, 2018 and 2017 are as follows (in years): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions Total All Acquisitions Trade names and trademarks 18.0 10.0 17.6 11.2 Customer and supplier relationships 3.0 7.9 4.0 18.6 Software and other technology related assets 5.2 6.5 5.2 11.1 Covenants not to compete — — — 4.4 Total acquired finite-lived intangible assets 12.4 8.5 12.0 16.5 Our estimated useful lives for our finite-lived intangible assets are as follows: Method of Amortization Useful Life Trade names and trademarks Straight-line 4-30 years Customer and supplier relationships Accelerated 3-20 years Software and other technology related assets Straight-line 3-15 years Covenants not to compete Straight-line 2-5 years Amortization expense for intangibles was $137 million , $102 million , and $83 million during the years ended December 31, 2018 , 2017 , and 2016 , respectively. Estimated amortization expense for each of the five years in the period ending December 31, 2023 is $140 million , $110 million , $80 million , $66 million and $59 million , respectively.
Equity Method Investments [Policy Text Block]	Investments in Unconsolidated Subsidiaries Our investment in unconsolidated subsidiaries was $179 million and $208 million as of December 31, 2018 and December 31, 2017, respectively. On December 1, 2016 , we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million . Headquartered in Stockholm, Sweden, Mekonomen is a leading independent car parts and service chain in northern Europe, offering a range of products including spare parts and accessories for cars, and workshop services for consumers and businesses. As a result of the investment, we nominated two representatives for election to Mekonomen's board of directors; both representatives were subsequently elected to and continue to serve on the board of directors, including one as the chairman of the board. We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of December 31, 2018, the book value of our investment in Mekonomen exceeded our share of the book value of Mekonomen's net assets by $85 million ; this difference is primarily related to goodwill and the fair value of other intangible assets. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded equity losses of $64 million during the year ended December 31, 2018, and equity in earnings of $7 million during the year ended December 31, 2017 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments. In May 2018 and May 2017, we received cash dividends of $8 million (SEK 67 million ) and $7 million (SEK 67 million ), respectively, related to our investment in Mekonomen. Mekonomen announced in February 2019 that the Mekonomen Board of Directors has proposed no dividend payments in 2019. On July 6, 2018, Mekonomen announced the acquisition of two automotive spare parts distributors in Denmark and Poland. The objective of the acquisition was to strengthen Mekonomen's position in the sale of automotive spare parts in northern Europe and to establish a strong market position in Denmark and Poland, where Mekonomen previously had no operations. The acquisition was partially financed by a rights issue with preferential rights for Mekonomen's existing shareholders, who were given the right to subscribe for four new Mekonomen shares per seven existing owned shares at a discounted share price. On October 5, 2018, we subscribed for our pro rata share in the rights issue giving us the right to acquire an additional $48 million of equity in Mekonomen at a discounted share price, increasing our equity interest to 26.6% . During the third quarter of 2018, we recorded a derivative instrument of $29 million in Other assets on our Consolidated Balance Sheets, which represented our right to acquire Mekonomen shares at a discount. In the third quarter of 2018, we measured the derivative instrument at fair value, and we recorded a $3 million gain on our fair value remeasurement. We acquired the additional $48 million of equity in Mekonomen in October 2018. In the fourth quarter, we recorded an $8 million loss related to the settlement of the derivative instrument in October 2018 due to a decrease in the Mekonomen share price from the last day of the third quarter to the settlement date. The net derivative loss of $5 million is recorded in Interest income and other income, net on the Consolidated Statements of Income. We evaluated our investment in Mekonomen for other-than-temporary impairment as of December 31, 2018, and concluded the decline in fair value was other-than-temporary due to a significant stock price decrease since September 30, 2018. Therefore, we recognized an other-than-temporary impairment of $48 million , which represented the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price of SEK 92 as of December 31, 2018. During the third quarter of 2018, we had recognized an other-than-temporary impairment of $23 million due to a prolonged and significant stock price decrease; the fair value was determined using the Mekonomen share price of SEK 126 as of September 30, 2018. The impairment charges are recorded in Equity in (losses) earnings of unconsolidated subsidiaries in our Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge in the fourth quarter, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at December 31, 2018 approximated the carrying value of $154 million . From year-end to February 22, 2019, the Mekonomen share price declined to SEK 69 , or 24.9% relative to the December 31, 2018 share price. This further decrease creates the potential for an additional other-than-temporary impairment charge in 2019.
Warranty Reserve	Warranty Reserve Some of our salvage mechanical products are sold with a standard six month warranty against defects. Additionally, some of our remanufactured engines are sold with a standard three year warranty against defects. We also provide a limited lifetime warranty for certain of our aftermarket products. These assurance-type warranties are not considered a separate performance obligation, and thus no transaction price is allocated to them. We record the warranty costs in Cost of goods sold on our Consolidated Statements of Income. Our warranty reserve is calculated using historical claim information to project future warranty claims activity and is recorded within Other accrued expenses and Other noncurrent liabilities on our Consolidated Balance Sheets based on the expected timing of the related payments. The changes in the warranty reserve are as follows (in thousands): Balance as of January 1, 2017 $ 19,634 Warranty expense 38,608 Warranty claims (35,091 ) Balance as of December 31, 2017 23,151 Warranty expense 43,682 Warranty claims (43,571 ) Balance as of December 31, 2018 $ 23,262
Recent Accounting Pronouncements	Recent Accounting Pronouncements Adoption of New Revenue Standard In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update 2014-09. This update outlines a new comprehensive revenue recognition model that supersedes the prior revenue recognition guidance and requires companies to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. The FASB has issued several updates to ASU 2014-09, which collectively with ASU 2014-09, represent the FASB Accounting Standards Codification Topic 606 (“ASC 606”). On January 1, 2018, we adopted ASC 606 for all contracts using the modified retrospective method, which means the historical periods are presented under the previous revenue standards with the cumulative net income effect being adjusted through retained earnings. Most of the changes resulting from our adoption of ASC 606 were changes in presentation within the Consolidated Balance Sheets and the Consolidated Statements of Income. Therefore, while we made adjustments to certain opening balances on our January 1, 2018 balance sheet, we made no adjustments to opening retained earnings. We expect the impact of the adoption of ASC 606 to be immaterial to our net income on an ongoing basis. See Note 5, "Revenue Recognition" for the required disclosures under ASC 606. With the adoption of ASC 606, we reclassified certain amounts related to variable consideration. Under ASC 606, we are required to present a refund liability and a returns asset within the Consolidated Balance Sheet, whereas in periods prior to adoption, we presented the estimated margin impact of expected returns as a contra-asset within accounts receivable. Additionally, under ASC 606, the changes in the refund liability are reported in revenue, and the changes in the returns assets are reported in Cost of goods sold on the Consolidated Statements of Income. Prior to adoption, the change in the reserve for returns was generally reported as a net amount within revenue. As a result, the income statement presentation was adjusted concurrently with the balance sheet change beginning in 2018. The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands): Balance as of December 31, 2017 Adjustments Due to ASC 606 Balance as of January 1, 2018 Balance Sheet Assets Accounts receivable $ 1,027,106 $ 38,511 $ 1,065,617 Prepaid expenses and other current assets 134,479 44,508 178,987 Liabilities Refund liability — 83,019 83,019 The impact of the adoption of ASC 606 on our Consolidated Balance Sheet as of December 31, 2018 and our Consolidated Statements of Income for the year ended December 31, 2018 was as follows (in thousands): Balance as of December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Balance Sheet Assets Accounts receivable $ 1,154,083 $ 1,105,937 $ 48,146 Prepaid expenses and other current assets 199,030 142,591 56,439 Liabilities Refund liability 104,585 — 104,585 Year ended December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Income Statement Revenue $ 11,876,674 $ 11,884,651 $ (7,977 ) Cost of goods sold 7,301,817 7,306,885 (5,068 ) Selling, general and administrative expenses 3,352,731 3,355,640 (2,909 ) We have not included a table of the impact of the balance sheet adjustments on the Consolidated Statement of Cash Flows as the adjustment will net to zero within the operating activities section of this statement. Under ASC 606, we have elected not to adjust consideration for the effect of a significant financing component at contract inception if the period between the transfer of goods to the customer and payment received from the customer is one year or less. Generally, our payment terms are short term in nature, but in some instances we may offer extended terms to customers exceeding one year such that interest would be accrued with respect to those contracts. The interest that would be accrued related to these contracts is immaterial at December 31, 2018. Other Recently Adopted Accounting Pronouncements During the first quarter of 2018, we adopted ASU No. 2016-01, “Recognition and Measurement of Financial Assets and Financial Liabilities” (“ASU 2016-01”), which changes how entities will recognize, measure, present and make disclosures about certain financial assets and financial liabilities. The adoption of ASU 2016-01 did not have a significant impact on our financial position, results of operations, cash flows or disclosures. During the first quarter of 2018, we adopted ASU No. 2016-15, "Classification of Certain Cash Receipts and Cash Payments" ("ASU 2016-15"), which includes guidance on classification for the following items: debt prepayment or debt extinguishment costs, settlement of zero coupon bonds, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims and corporate-owned or bank-owned life insurance policies, distributions received from equity method investees, beneficial interests in securitization transactions, and other separately identifiable cash flows where application of the predominance principle is prescribed. No adjustments were required in our Consolidated Statement of Cash Flows upon adoption. Within our Consolidating Statements of Cash Flows in Note 18, "Condensed Consolidating Financial Information ," we now present a new line item, Payments of deferred purchase price on receivables securitization, as a result of adopting ASU 2016-15; prior year cash flow information within this footnote has been recast to reflect the impact of adopting this accounting standard. Other than the addition of this new line item, there was no impact to our Consolidating Statements of Cash Flows upon adoption. During the first quarter of 2018, we adopted ASU No. 2016-18, "Restricted Cash" ("ASU 2016-18"), which requires an entity to include in its cash and cash equivalent balances in the statement of cash flows those amounts that are deemed to be restricted cash and restricted cash equivalents, and clarifies how these amounts should be presented therein. At the time we adopted this accounting standard in the first quarter of 2018, there was no impact to our Consolidated Statements of Cash Flows, as we did not have any restricted cash balances. We have restricted cash as of December 31, 2018 and therefore, the Consolidated Statements of Cash Flows have been updated to reflect this guidance. For more information on our restricted cash balances as of December 31, 2018, refer to the "Cash, Cash Equivalents and Restricted Cash" section of this footnote above. During the first quarter of 2018, we adopted ASU No. 2017-01, "Clarifying the Definition of a Business" (“ASU 2017-01”), which requires an entity to evaluate if substantially all of the fair value of assets acquired is concentrated in a single identifiable asset or a group of similar identifiable assets; if so, the transaction does not qualify as a business. The guidance also requires an acquired business to include at least one substantive process and narrows the definition of outputs. The adoption of ASU 2017-01 did not have a material impact on our consolidated financial statements. During the first quarter of 2018, we adopted ASU No. 2018-02, "Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"), which allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the reduction of the U.S. federal statutory income tax rate to 21% from 35% due to the enactment of the Tax Cuts and Jobs Act of 2017 (the "Tax Act"). In addition, under ASU 2018-02, an entity is required to provide certain disclosures regarding stranded tax effects. ASU 2018-02 is effective for fiscal years and interim periods beginning after December 15, 2018; early adoption is permitted. As a result of the adoption of ASU 2018-02, we recorded a $5 million reclassification to increase Accumulated Other Comprehensive (Loss) Income and decrease Retained Earnings. During the first quarter of 2018, we adopted ASU No. 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost" ("ASU 2017-07"), which requires presentation of the current service cost component of net periodic benefit expense with other current compensation expenses for the related employees, and requires presentation of the remaining components of net periodic benefit expense, such as interest, expected return on plan assets, and amortization of actuarial gains and losses, outside of operating income. ASU 2017-07 also specifies that, on a prospective basis, only the service cost component is eligible for capitalization into inventory or other assets. The income statement classification provisions of ASU 2017-07 are applicable on a retrospective basis, therefore we recast prior period income statement information for 2017; the recast had the impact of increasing Selling, general and administrative expenses for the year ended December 31, 2017 by $2 million , with a corresponding increase to Interest income and other income, net. The impact was immaterial to our Consolidated Statements of Income in 2016, thus we did not recast for 2016. The change in the capitalization provisions under ASU 2017-07 did not have a material impact on our consolidated financial statements. See Note 14, "Employee Benefit Plans," for further disclosure on the components of net periodic benefit expense and classification of the components within our Consolidated Statements of Income for the year ended December 31, 2018 , 2017 , and 2016. During 2018, the FASB issued ASU No. 2018-15, "Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract" ("ASU 2018-15"). This update requires an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. ASU 2018-15 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We adopted ASU 2018-15 in the third quarter of 2018 as we believe that our existing policy is consistent with the new guidance and thus no adjustments were required to be in compliance with this update. In August 2018, the FASB issued ASU No. 2018-14, "Disclosure Framework- Changes to the Disclosure Requirements for Defined Benefit Plans" ("ASU 2018-14"), which removes, modifies, and adds certain disclosure requirements to the ASC 715 (Compensation- Retirement Benefits) guidance. ASU 2018-14 is effective for fiscal years and interim periods beginning after December 15, 2020; early adoption is permitted. We early adopted ASU 2018-14 in the fourth quarter of 2018; the required disclosures are reflected in Note 14, "Employee Benefit Plans." Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, "Leases" ("ASU 2016-02"), to increase transparency and comparability by recognizing lease assets and lease liabilities on the balance sheet and disclosing key information about leasing arrangements. The main difference between current GAAP and ASU 2016-02 is the recognition of lease assets and lease liabilities by lessees for those leases classified as operating leases under current GAAP. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018. The standard requires that entities apply the effects of these changes using a modified retrospective approach, which includes a number of optional practical expedients. We will adopt the standard in the first quarter of 2019 and take advantage of the transition package of practical expedients permitted within the new standard, which, among other things, allows us to carryforward the historical lease classification. We will make an accounting policy election that will keep leases with an initial term of 12 months or less off of the balance sheet and will result in recognizing those lease payments in the Consolidated Statements of Operations on a straight-line basis over the lease term. While we are continuing to assess all potential impacts of the standard, we expect total liabilities and leased assets to increase by $1.2 billion to $1.4 billion as of the date of adoption. The difference between these amounts primarily represents the existing deferred rent liabilities balance, resulting from the historical straight-line treatment of operating leases, which is reclassified as a reduction of the lease assets upon adoption. We do not believe the standard will materially affect our Statements of Income or Statements of Cash Flows as operating lease payments will still be an operating cash outflow and capital lease payments will still be a financing cash outflow. These estimates, which are based on our current lease portfolio, may change as we continue to evaluate the new standard and perform the necessary reconciliations between our recently implemented global lease accounting system and our lease expense accounts. The estimates could also change due to changes in the lease portfolio, which could include (a) lease volume, (b) lease commencement dates, and (c) renewal option and lease termination expectations. We do not believe the new standard will have a notable impact on our liquidity. The standard will have no impact on our debt-covenant compliance under our current agreements as the covenant calculations are based on the prior lease accounting rules. In August 2017, the FASB issued ASU No. 2017-12, "Targeted Improvements to Accounting for Hedging Activities" ("ASU 2017-12"), which amends the hedge accounting recognition and presentation requirements in ASC 815 ("Derivatives and Hedging"). ASU 2017-12 significantly alters the hedge accounting model by making it easier for an entity to achieve and maintain hedge accounting and provides for accounting that better reflects an entity's risk management activities. ASU 2017-12 is effective for fiscal years and interim periods beginning after December 15, 2018; we are adopting the standard in the first quarter of 2019. Entities will adopt the provisions of ASU 2017-12 by applying a modified retrospective approach to existing hedging relationships as of the adoption date. At this time, we are still evaluating the impact of this standard on our financial statements. In August 2018, the FASB issued ASU No. 2018-13, "Disclosure Framework- Changes to the Disclosure Requirements for Fair Value Measurement" ("ASU 2018-13"), which removes, modifies, and adds certain disclosure requirements in ASC 820. ASU 2018-13 is effective for fiscal years and interim periods beginning after December 15, 2019; early adoption is permitted. We are in the process of evaluating the impact of this standard on our disclosures but do not believe that it will have a material impact. In June 2016, the FASB issued ASU 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), and in November 2018 issued a subsequent amendment, ASU 2018-19, "Codification Improvements to Topic 326, Financial Instruments - Credit Losses" ("ASU 2018-19"). ASU 2016-13 significantly changes how entities will measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. ASU 2016-13 will replace today’s “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. ASU 2018-19 will affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope of this amendment that have the contractual right to receive cash. ASU 2016-13 and ASU 2018-19 should be applied on either a prospective transition or modified-retrospective approach depending on the subtopic. ASU 2016-13 is effective for annual periods beginning after December 15, 2019, and interim periods therein. Early adoption is permitted for annual periods beginning after December 15, 2018, and interim periods therein. We are currently evaluating the impact of the adoption of this standard on our consolidated financial statements.

Revenue Recognition Revenue R_2

Revenue Recognition Revenue Recognition (Policies)	12 Months Ended
	Dec. 31, 2018
Revenue Recognition [Abstract]
Revenue Recognition, Policy [Policy Text Block]	Revenue Recognition See Note 5, "Revenue Recognition" for our accounting policies related to revenue. Revenue Recognition The core principle of ASC 606 is to recognize revenue when promised goods or services are transferred to customers in an amount that reflects the consideration that is expected to be received for those goods or services. ASC 606 defines a five-step process to achieve this core principle, which includes: 1. Identifying contracts with customers, 2. Identifying performance obligations within those contracts, 3. Determining the transaction price, 4. Allocating the transaction price to the performance obligations in the contract, which may include an estimate of variable consideration, and 5. Recognizing revenue when or as each performance obligation is satisfied. The majority of our revenue is derived from the sale of vehicle parts. Under both the previous revenue standards and ASC 606, we recognize revenue when the products are shipped to, delivered to or picked up by customers, which is the point when title has transferred and risk of ownership has passed. Sources of Revenue We report our revenue in two categories: (i) parts and services and (ii) other. The following table sets forth our revenue by category, with our parts and services revenue further disaggregated by reportable segment (in thousands): Year Ended December 31, 2018 2017 2016 North America $ 4,558,220 $ 4,278,531 $ 4,009,129 Europe 5,202,231 3,628,906 2,915,841 Specialty 1,472,956 1,301,197 1,219,675 Parts and services 11,233,407 9,208,634 8,144,645 Other 643,267 528,275 439,386 Total revenue $ 11,876,674 $ 9,736,909 $ 8,584,031 Parts and Services Our parts revenue is generated from the sale of vehicle products including replacement parts, components and systems used in the repair and maintenance of vehicles and specialty products and accessories to improve the performance, functionality and appearance of vehicles. Services revenue includes additional services that are generally billed concurrently with the related product sales, such as the sale of service-type warranties and fees for admission to our self service yards. In North America, our vehicle replacement products include sheet metal collision parts such as doors, hoods, and fenders; bumper covers; head and tail lamps; automotive glass products such as windshields; mirrors and grilles; wheels; and large mechanical items such as engines and transmissions. In Europe, our products include a wide variety of small mechanical products such as brake pads, discs and sensors; clutches; electrical products such as spark plugs and batteries; steering and suspension products; filters; and oil and automotive fluids. In our Specialty operations, we serve six product segments: truck and off-road; speed and performance; RV; towing; wheels, tires and performance handling; and miscellaneous accessories. Our service-type warranties typically have service periods ranging from 6 months to 36 months . Under ASC 606, proceeds from these service-type warranties are deferred at contract inception and amortized on a straight-line basis to revenue over the contract period. The changes in deferred service-type warranty revenue are as follows (in thousands): Balance as of January 1, 2018 $ 19,465 Additional warranty revenue deferred 38,736 Warranty revenue recognized (34,195 ) Balance as of December 31, 2018 $ 24,006 Other Revenue Revenue from other sources includes scrap sales, bulk sales to mechanical manufacturers (including cores) and sales of aluminum ingots and sows from our furnace operations. We derive scrap metal from several sources, including vehicles that have been used in both our wholesale and self service recycling operations and from OEMs and other entities that contract with us for secure disposal of "crush only" vehicles. The sale of hulks in our wholesale and self service recycling operations represents one performance obligation, and revenue is recognized based on a price per weight when the customer (processor) collects the scrap. Some adjustments may occur when the customer weighs the scrap at their location, and revenue is adjusted accordingly. We constrain our estimate of consideration to be received to the extent that we believe there will not be a significant reversal in revenue. Revenue by Geographic Area See Note 16, "Segment and Geographic Information" for information related to our revenue by geographic region. Variable Consideration The amount of revenue ultimately received from the customer can vary due to variable consideration which includes returns, discounts, rebates, refunds, credits, price concessions, incentives, performance bonuses, or other similar items. The previous revenue guidance required us to estimate the transaction price using a best estimate approach. Under ASC 606 we are required to select the “expected value method” or the “most likely amount” method in order to estimate variable consideration. We utilize both methods in practice depending on the type of variable consideration. In addition, our estimates of variable consideration are constrained to the extent that a significant reversal in revenue is not expected. We recorded a refund liability and return asset for expected returns of $105 million and $56 million , respectively, as of December 31, 2018 and a net reserve of $38 million as of December 31, 2017. The refund liability is presented separately on the balance sheet within current liabilities while the return asset is presented within prepaid expenses and other current assets. Other types of variable consideration consist primarily of discounts, volume rebates, and other customer sales incentives which are recorded in Receivables, net on the Consolidated Balance Sheets. We recorded a reserve for our variable consideration of $103 million and $78 million as of December 31, 2018 and December 31, 2017 , respectively. Our May 2018 acquisition of Stahlgruber contributed $26 million to our variable consideration reserve; see Note 2, "Business Combinations" for further information on our acquisitions. While other customer incentive programs exist, we characterize them as material rights in the context of our sales transactions. We consider these programs to be immaterial to our consolidated financial statements. Contract Costs Under ASC 340, "Other Assets and Deferred Costs," we have elected to recognize incremental costs of obtaining a contract (commissions earned by our sales representatives on product sales) as an expense when incurred, as we believe the amortization period of the asset would be one year or less due to the short-term nature of our contracts. Sales Taxes We present taxes assessed by governmental authorities collected from customers on a net basis. Therefore, the taxes are excluded from revenue on our Consolidated Statements of Income and are shown as a current liability on our Consolidated Balance Sheets until remitted.

Business Combinations (Tables)

Business Combinations (Tables)	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Purchase Price Allocations For Acquisitions	The purchase price allocations for the acquisitions completed during the years ended December 31, 2018 and 2017 are as follows (in thousands): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions (1) Total All (2) Receivables $ 144,826 $ 19,171 $ 163,997 $ 73,782 Receivable reserves (2,818 ) (918 ) (3,736 ) (7,032 ) Inventories (3) 380,238 14,021 394,259 150,342 Prepaid expenses and other current assets 10,970 1,851 12,821 (295 ) Property , plant and equipment 271,292 5,711 277,003 41,039 Goodwill 908,253 64,637 972,890 314,817 Other intangibles 285,255 35,159 320,414 181,216 Other assets 16,625 37 16,662 3,257 Deferred income taxes (78,130 ) (5,285 ) (83,415 ) (65,087 ) Current liabilities assumed (346,788 ) (20,116 ) (366,904 ) (111,484 ) Debt assumed (79,925 ) (4,875 ) (84,800 ) (33,586 ) Other noncurrent liabilities assumed (4) (80,824 ) (10,306 ) (91,130 ) (1,917 ) Noncontrolling interest (44,110 ) — (44,110 ) — Contingent consideration liabilities — (3,107 ) (3,107 ) (6,234 ) Other purchase price obligations (6,084 ) 3,623 (2,461 ) (5,074 ) Stock issued (251,334 ) — (251,334 ) — Notes issued — (11,347 ) (11,347 ) (20,187 ) Settlement of pre-existing balances — — — 242 Gains on bargain purchases (5) — (2,418 ) (2,418 ) (3,870 ) Settlement of other purchase price obligations (non-interest bearing) — 1,711 1,711 3,159 Cash used in acquisitions, net of cash and restricted cash acquired $ 1,127,446 $ 87,549 $ 1,214,995 $ 513,088
Pro Forma Effect Of Businesses Acquired	The following unaudited pro forma summary presents the effect of the businesses acquired during the year ended December 31, 2018 as though the businesses had been acquired as of January 1, 2017, the businesses acquired during the year ended December 31, 2017 as though they had been acquired as of January 1, 2016, and the businesses acquired during the year ended December 31, 2016 as though they had been acquired as of January 1, 2015. The pro forma adjustments are based upon unaudited financial information of the acquired entities (in thousands, except per share data): Year Ended December 31, 2018 2017 2016 Revenue, as reported $ 11,876,674 $ 9,736,909 $ 8,584,031 Revenue of purchased businesses for the period prior to acquisition: Stahlgruber 815,405 1,756,893 — Rhiag — — 213,376 PGW (1) — — 102,540 Other acquisitions 72,301 448,721 854,601 Pro forma revenue $ 12,764,380 $ 11,942,523 $ 9,754,548 Income from continuing operations, as reported (2) $ 487,565 $ 536,974 $ 456,123 Income from continuing operations of purchased businesses for the period prior to acquisition, and pro forma purchase accounting adjustments: Stahlgruber 17,309 4,796 — Rhiag — — (84 ) PGW (1), (3) — — 7,574 Other acquisitions 1,507 16,667 19,323 Acquisition related expenses, net of tax (4) 14,414 8,787 11,602 Pro forma income from continuing operations 520,795 567,224 494,538 Less: Pro forma net income attributable to noncontrolling interest 2,799 1,095 — Pro forma income from continuing operations attributable to LKQ stockholders $ 517,996 $ 566,129 $ 494,538 Earnings per share from continuing operations, basic - as reported $ 1.55 $ 1.74 $ 1.49 Effect of purchased businesses for the period prior to acquisition: Stahlgruber 0.06 0.02 — Rhiag — — (0.00 ) PGW (1), (3) — — 0.02 Other acquisitions 0.00 0.05 0.06 Acquisition related expenses, net of tax (4) 0.05 0.03 0.04 Impact of share issuance from acquisition of Stahlgruber (0.02 ) (0.04 ) — Pro forma earnings per share from continuing operations, basic (5) 1.64 1.79 1.61 Less: Pro forma net income attributable to noncontrolling interest 0.01 0.00 — Pro forma income from continuing operations attributable to LKQ stockholders $ 1.63 $ 1.79 $ 1.61 Earnings per share from continuing operations, diluted - as reported $ 1.54 $ 1.73 $ 1.47 Effect of purchased businesses for the period prior to acquisition: Stahlgruber 0.05 0.02 — Rhiag — — (0.00 ) PGW (1), (3) — — 0.02 Other acquisitions 0.00 0.05 0.06 Acquisition related expenses, net of tax (4) 0.05 0.03 0.04 Impact of share issuance from acquisition of Stahlgruber (0.02 ) (0.04 ) — Pro forma earnings per share from continuing operations, diluted (5) 1.63 1.78 1.60 Less: Pro forma net income attributable to noncontrolling interest 0.01 0.00 — Pro forma income from continuing operations attributable to LKQ stockholders $ 1.62 $ 1.78 $ 1.60

Discontinued Operations Discont

Discontinued Operations Discontinued Operations Income statement (Tables)	12 Months Ended
	Dec. 31, 2018
Cash flow from discontinued operations [Table Text Block]	Period from January 1 Period from April 21 to March 1, to December 31, 2017 2016 Non-cash operating activities: Depreciation and amortization $ — $ 7,752 Impairment of net assets of discontinued operations — 26,677 Deferred income taxes — (4,516 ) Capital expenditures (3,598 ) (24,156 ) Investments in unconsolidated subsidiaries — (4,400 )
Disposal Groups, Including Discontinued Operations [Table Text Block]	The following table summarizes the operating results of the Company’s discontinued operations related to the sale described above for the years ended December 31, 2018, 2017 and 2016, as presented in Net (loss) income from discontinued operations on the Consolidated Statements of Income (in thousands): Year Ended December 31, 2018 2017 2016 Revenue $ — $ 111,130 $ 498,233 Cost of goods sold — 100,084 424,161 Selling, general and administrative expenses — 8,369 22,330 Impairment on net assets of discontinued operations (1) — — 26,677 Operating income — 2,677 25,065 Interest income and other income (expense), net (2) — 1,204 (9,136 ) Income from discontinued operations before taxes — 3,881 15,929 Provision for income taxes — 3,598 8,252 Equity in (loss) earnings of unconsolidated subsidiaries — (534 ) 175 (Loss) income from discontinued operations, net of tax — (251 ) 7,852 Loss on sale of discontinued operations, net of tax (3) (4,397 ) (6,495 ) — Net (loss) income from discontinued operations $ (4,397 ) $ (6,746 ) $ 7,852

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Warranty Reserve	Warranty Reserve Some of our salvage mechanical products are sold with a standard six month warranty against defects. Additionally, some of our remanufactured engines are sold with a standard three year warranty against defects. We also provide a limited lifetime warranty for certain of our aftermarket products. These assurance-type warranties are not considered a separate performance obligation, and thus no transaction price is allocated to them. We record the warranty costs in Cost of goods sold on our Consolidated Statements of Income. Our warranty reserve is calculated using historical claim information to project future warranty claims activity and is recorded within Other accrued expenses and Other noncurrent liabilities on our Consolidated Balance Sheets based on the expected timing of the related payments. The changes in the warranty reserve are as follows (in thousands): Balance as of January 1, 2017 $ 19,634 Warranty expense 38,608 Warranty claims (35,091 ) Balance as of December 31, 2017 23,151 Warranty expense 43,682 Warranty claims (43,571 ) Balance as of December 31, 2018 $ 23,262
Equity Method Investments [Policy Text Block]	Investments in Unconsolidated Subsidiaries Our investment in unconsolidated subsidiaries was $179 million and $208 million as of December 31, 2018 and December 31, 2017, respectively. On December 1, 2016 , we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million . Headquartered in Stockholm, Sweden, Mekonomen is a leading independent car parts and service chain in northern Europe, offering a range of products including spare parts and accessories for cars, and workshop services for consumers and businesses. As a result of the investment, we nominated two representatives for election to Mekonomen's board of directors; both representatives were subsequently elected to and continue to serve on the board of directors, including one as the chairman of the board. We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of December 31, 2018, the book value of our investment in Mekonomen exceeded our share of the book value of Mekonomen's net assets by $85 million ; this difference is primarily related to goodwill and the fair value of other intangible assets. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded equity losses of $64 million during the year ended December 31, 2018, and equity in earnings of $7 million during the year ended December 31, 2017 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments. In May 2018 and May 2017, we received cash dividends of $8 million (SEK 67 million ) and $7 million (SEK 67 million ), respectively, related to our investment in Mekonomen. Mekonomen announced in February 2019 that the Mekonomen Board of Directors has proposed no dividend payments in 2019. On July 6, 2018, Mekonomen announced the acquisition of two automotive spare parts distributors in Denmark and Poland. The objective of the acquisition was to strengthen Mekonomen's position in the sale of automotive spare parts in northern Europe and to establish a strong market position in Denmark and Poland, where Mekonomen previously had no operations. The acquisition was partially financed by a rights issue with preferential rights for Mekonomen's existing shareholders, who were given the right to subscribe for four new Mekonomen shares per seven existing owned shares at a discounted share price. On October 5, 2018, we subscribed for our pro rata share in the rights issue giving us the right to acquire an additional $48 million of equity in Mekonomen at a discounted share price, increasing our equity interest to 26.6% . During the third quarter of 2018, we recorded a derivative instrument of $29 million in Other assets on our Consolidated Balance Sheets, which represented our right to acquire Mekonomen shares at a discount. In the third quarter of 2018, we measured the derivative instrument at fair value, and we recorded a $3 million gain on our fair value remeasurement. We acquired the additional $48 million of equity in Mekonomen in October 2018. In the fourth quarter, we recorded an $8 million loss related to the settlement of the derivative instrument in October 2018 due to a decrease in the Mekonomen share price from the last day of the third quarter to the settlement date. The net derivative loss of $5 million is recorded in Interest income and other income, net on the Consolidated Statements of Income. We evaluated our investment in Mekonomen for other-than-temporary impairment as of December 31, 2018, and concluded the decline in fair value was other-than-temporary due to a significant stock price decrease since September 30, 2018. Therefore, we recognized an other-than-temporary impairment of $48 million , which represented the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price of SEK 92 as of December 31, 2018. During the third quarter of 2018, we had recognized an other-than-temporary impairment of $23 million due to a prolonged and significant stock price decrease; the fair value was determined using the Mekonomen share price of SEK 126 as of September 30, 2018. The impairment charges are recorded in Equity in (losses) earnings of unconsolidated subsidiaries in our Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge in the fourth quarter, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at December 31, 2018 approximated the carrying value of $154 million . From year-end to February 22, 2019, the Mekonomen share price declined to SEK 69 , or 24.9% relative to the December 31, 2018 share price. This further decrease creates the potential for an additional other-than-temporary impairment charge in 2019.
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment Property, plant and equipment are recorded at cost less accumulated depreciation. Expenditures for major additions and improvements that extend the useful life of the related asset are capitalized. As property, plant and equipment are sold or retired, the applicable cost and accumulated depreciation are removed from the accounts and any resulting gain or loss thereon is recognized. Construction in progress consists primarily of building and land improvements at our existing facilities. Depreciation is calculated using the straight-line method over the estimated useful lives or, in the case of leasehold improvements, the term of the related lease and reasonably assured renewal periods, if shorter. Our estimated useful lives are as follows: Land improvements 10-20 years Buildings and improvements 20-40 years Machinery and equipment 3-20 years Computer equipment and software 3-10 years Vehicles and trailers 3-10 years Furniture and fixtures 5-7 years Property, plant and equipment consists of the following (in thousands): December 31, 2018 2017 Land and improvements $ 177,998 $ 137,790 Buildings and improvements 378,490 233,078 Machinery and equipment 626,615 521,526 Computer equipment and software 143,547 133,753 Vehicles and trailers 176,186 161,269 Furniture and fixtures 58,919 31,794 Leasehold improvements 278,687 257,506 1,840,442 1,476,716 Less—Accumulated depreciation (685,751 ) (606,112 ) Construction in progress 65,471 42,485 Total property, plant and equipment, net $ 1,220,162 $ 913,089 The components of opening property, plant and equipment acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands): Gross Amount Land and improvements $ 47,281 Buildings and improvements 135,628 Machinery and equipment 49,384 Computer equipment and software 3,760 Vehicles and trailers 643 Furniture and fixtures 30,426 Leasehold improvements 1,890 269,012 Construction in progress 2,280 Total property, plant and equipment $ 271,292 We record depreciation expense associated with our refurbishing, remanufacturing, manufacturing and furnace operations as well as our distribution centers in Cost of goods sold on the Consolidated Statements of Income. All other depreciation expense is reported in Depreciation and amortization. Total depreciation expense for the years ended December 31, 2018, 2017, and 2016 was $157 million , $129 million , and $115 million , respectively.
Schedule Of Inventory	Inventories consist of the following (in thousands): December 31, 2018 2017 Aftermarket and refurbished products $ 2,309,458 $ 1,877,653 Salvage and remanufactured products 503,199 487,108 Manufactured products 23,418 16,022 Total inventories $ 2,836,075 $ 2,380,783
Schedule Of Estimated Useful Lives	Our estimated useful lives are as follows: Land improvements 10-20 years Buildings and improvements 20-40 years Machinery and equipment 3-20 years Computer equipment and software 3-10 years Vehicles and trailers 3-10 years Furniture and fixtures 5-7 years
Property, Plant and Equipment [Table Text Block]	Property, plant and equipment consists of the following (in thousands): December 31, 2018 2017 Land and improvements $ 177,998 $ 137,790 Buildings and improvements 378,490 233,078 Machinery and equipment 626,615 521,526 Computer equipment and software 143,547 133,753 Vehicles and trailers 176,186 161,269 Furniture and fixtures 58,919 31,794 Leasehold improvements 278,687 257,506 1,840,442 1,476,716 Less—Accumulated depreciation (685,751 ) (606,112 ) Construction in progress 65,471 42,485 Total property, plant and equipment, net $ 1,220,162 $ 913,089
Schedule of Goodwill [Table Text Block]	Intangible Assets Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete. Goodwill is tested for impairment at least annually, and we performed annual impairment tests during the fourth quarters of 2018 , 2017 and 2016 . Goodwill impairment testing may also be performed on an interim basis when events or circumstances arise that may lead to impairment. The fair value estimates of our reporting units are established using weightings of the results of a discounted cash flow methodology and a comparative market multiples approach. Based on our annual goodwill impairment test in the fourth quarter of 2018, we determined the carrying value of our Aviation reporting unit exceeded the fair value estimate by more than the carrying value, thus we recorded an impairment charge of $33 million , which represented the total carrying value of goodwill in our Aviation reporting unit. The impairment charge was due to a decrease in the fair value estimate from the prior year fair value estimate, primarily driven by a significant deterioration in the outlook for the Aviation reporting unit due to competition, customer financial issues and changing market conditions for the airplane platforms that the business services, which lowered our projected gross margin and related future cash flows. We reported the impairment charge in Impairment of goodwill on the Consolidated Statements of Income for the year ended December 31, 2018. We determined no other impairments existed when we performed our annual impairment testing on the remaining reporting units as all those reporting units had a fair value estimate which exceeded the carrying value by at least approximately 15% , the level at which our Europe reporting unit exceeded its carrying value. The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands): North America Europe Specialty Total Balance as of January 1, 2016 $ 1,433,499 $ 594,482 $ 291,265 $ 2,319,246 Business acquisitions and adjustments to previously recorded goodwill 226,483 614,437 1,889 842,809 Exchange rate effects 1,818 (108,943 ) (161 ) (107,286 ) Balance as of December 31, 2016 $ 1,661,800 $ 1,099,976 $ 292,993 $ 3,054,769 Business acquisitions and adjustments to previously recorded goodwill 39,836 155,366 119,615 314,817 Exchange rate effects 7,718 159,556 (349 ) 166,925 Balance as of December 31, 2017 $ 1,709,354 $ 1,414,898 $ 412,259 $ 3,536,511 Business acquisitions and adjustments to previously recorded goodwill 6,805 970,923 (4,838 ) 972,890 Impairment of goodwill (33,244 ) — — (33,244 ) Exchange rate effects (9,383 ) (85,532 ) 216 (94,699 ) Balance as of December 31, 2018 $ 1,673,532 $ 2,300,289 $ 407,637 $ 4,381,458 Accumulated impairment losses as of December 31, 2018 $ (33,244 ) $ — $ — $ (33,244 ) During the year ended December 31, 2018, we recorded $908 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions.
Schedule of Finite-Lived and Indefinite-Lived Intangibles [Table Text Block]	The components of other intangibles, net are as follows (in thousands): December 31, 2018 December 31, 2017 Intangible assets subject to amortization $ 847,452 $ 664,969 Indefinite-lived intangible assets Trademarks 81,300 78,800 Total $ 928,752 $ 743,769
Cumulative Impact of ASC 606 on Balance Sheet as of the Beginning of Fiscal Year	The cumulative effect of the changes made to our consolidated January 1, 2018 balance sheet for the adoption of ASC 606 was as follows (in thousands): Balance as of December 31, 2017 Adjustments Due to ASC 606 Balance as of January 1, 2018 Balance Sheet Assets Accounts receivable $ 1,027,106 $ 38,511 $ 1,065,617 Prepaid expenses and other current assets 134,479 44,508 178,987 Liabilities Refund liability — 83,019 83,019
Schedule of Estimated Useful Lives, Finite Lived Intangible Assets [Table Text Block]	Our estimated useful lives for our finite-lived intangible assets are as follows: Method of Amortization Useful Life Trade names and trademarks Straight-line 4-30 years Customer and supplier relationships Accelerated 3-20 years Software and other technology related assets Straight-line 3-15 years Covenants not to compete Straight-line 2-5 years
Components Of Other Intangibles	The components of intangible assets subject to amortization are as follows (in thousands): December 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trade names and trademarks $ 496,166 $ (94,451 ) $ 401,715 $ 327,332 $ (75,095 ) $ 252,237 Customer and supplier relationships 593,517 (247,464 ) 346,053 510,113 (167,532 ) 342,581 Software and other technology related assets 176,118 (79,283 ) 96,835 124,049 (59,081 ) 64,968 Covenants not to compete 13,344 (10,495 ) 2,849 14,981 (9,798 ) 5,183 Total $ 1,279,145 $ (431,693 ) $ 847,452 $ 976,475 $ (311,506 ) $ 664,969
Cumulative Effect of Adoption of ASC 606 on Consolidated Financial Statements	The impact of the adoption of ASC 606 on our Consolidated Balance Sheet as of December 31, 2018 and our Consolidated Statements of Income for the year ended December 31, 2018 was as follows (in thousands): Balance as of December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Balance Sheet Assets Accounts receivable $ 1,154,083 $ 1,105,937 $ 48,146 Prepaid expenses and other current assets 199,030 142,591 56,439 Liabilities Refund liability 104,585 — 104,585 Year ended December 31, 2018 As Reported Amounts Without Adoption of ASC 606 Effect of Change Higher/(Lower) Income Statement Revenue $ 11,876,674 $ 11,884,651 $ (7,977 ) Cost of goods sold 7,301,817 7,306,885 (5,068 ) Selling, general and administrative expenses 3,352,731 3,355,640 (2,909 )
Schedule of Product Warranty Liability [Table Text Block]	The changes in the warranty reserve are as follows (in thousands): Balance as of January 1, 2017 $ 19,634 Warranty expense 38,608 Warranty claims (35,091 ) Balance as of December 31, 2017 23,151 Warranty expense 43,682 Warranty claims (43,571 ) Balance as of December 31, 2018 $ 23,262 The changes in deferred service-type warranty revenue are as follows (in thousands): Balance as of January 1, 2018 $ 19,465 Additional warranty revenue deferred 38,736 Warranty revenue recognized (34,195 ) Balance as of December 31, 2018 $ 24,006
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The components of intangible assets acquired as part of our acquisitions in 2018 are as follows (in thousands): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions (1) Total All Acquisitions Trade names and trademarks $ 173,946 $ 8,870 $ 182,816 $ 87,306 Customer and supplier relationships 77,980 20,779 98,759 75,450 Software and other technology related assets 33,329 376 33,705 15,757 Covenants not to compete — — — 2,703 Total $ 285,255 $ 30,025 $ 315,280 $ 181,216
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life [Table Text Block]	The weighted-average amortization periods for our intangible assets acquired during the years ended December 31, 2018 and 2017 are as follows (in years): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions Total All Acquisitions Trade names and trademarks 18.0 10.0 17.6 11.2 Customer and supplier relationships 3.0 7.9 4.0 18.6 Software and other technology related assets 5.2 6.5 5.2 11.1 Covenants not to compete — — — 4.4 Total acquired finite-lived intangible assets 12.4 8.5 12.0 16.5
Intangible Assets	Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete. Goodwill is tested for impairment at least annually, and we performed annual impairment tests during the fourth quarters of 2018 , 2017 and 2016 . Goodwill impairment testing may also be performed on an interim basis when events or circumstances arise that may lead to impairment. The fair value estimates of our reporting units are established using weightings of the results of a discounted cash flow methodology and a comparative market multiples approach. Based on our annual goodwill impairment test in the fourth quarter of 2018, we determined the carrying value of our Aviation reporting unit exceeded the fair value estimate by more than the carrying value, thus we recorded an impairment charge of $33 million , which represented the total carrying value of goodwill in our Aviation reporting unit. The impairment charge was due to a decrease in the fair value estimate from the prior year fair value estimate, primarily driven by a significant deterioration in the outlook for the Aviation reporting unit due to competition, customer financial issues and changing market conditions for the airplane platforms that the business services, which lowered our projected gross margin and related future cash flows. We reported the impairment charge in Impairment of goodwill on the Consolidated Statements of Income for the year ended December 31, 2018. We determined no other impairments existed when we performed our annual impairment testing on the remaining reporting units as all those reporting units had a fair value estimate which exceeded the carrying value by at least approximately 15% , the level at which our Europe reporting unit exceeded its carrying value. The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands): North America Europe Specialty Total Balance as of January 1, 2016 $ 1,433,499 $ 594,482 $ 291,265 $ 2,319,246 Business acquisitions and adjustments to previously recorded goodwill 226,483 614,437 1,889 842,809 Exchange rate effects 1,818 (108,943 ) (161 ) (107,286 ) Balance as of December 31, 2016 $ 1,661,800 $ 1,099,976 $ 292,993 $ 3,054,769 Business acquisitions and adjustments to previously recorded goodwill 39,836 155,366 119,615 314,817 Exchange rate effects 7,718 159,556 (349 ) 166,925 Balance as of December 31, 2017 $ 1,709,354 $ 1,414,898 $ 412,259 $ 3,536,511 Business acquisitions and adjustments to previously recorded goodwill 6,805 970,923 (4,838 ) 972,890 Impairment of goodwill (33,244 ) — — (33,244 ) Exchange rate effects (9,383 ) (85,532 ) 216 (94,699 ) Balance as of December 31, 2018 $ 1,673,532 $ 2,300,289 $ 407,637 $ 4,381,458 Accumulated impairment losses as of December 31, 2018 $ (33,244 ) $ — $ — $ (33,244 ) During the year ended December 31, 2018, we recorded $908 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions. The components of other intangibles, net are as follows (in thousands): December 31, 2018 December 31, 2017 Intangible assets subject to amortization $ 847,452 $ 664,969 Indefinite-lived intangible assets Trademarks 81,300 78,800 Total $ 928,752 $ 743,769 The components of intangible assets subject to amortization are as follows (in thousands): December 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Gross Carrying Amount Accumulated Amortization Net Trade names and trademarks $ 496,166 $ (94,451 ) $ 401,715 $ 327,332 $ (75,095 ) $ 252,237 Customer and supplier relationships 593,517 (247,464 ) 346,053 510,113 (167,532 ) 342,581 Software and other technology related assets 176,118 (79,283 ) 96,835 124,049 (59,081 ) 64,968 Covenants not to compete 13,344 (10,495 ) 2,849 14,981 (9,798 ) 5,183 Total $ 1,279,145 $ (431,693 ) $ 847,452 $ 976,475 $ (311,506 ) $ 664,969 The components of intangible assets acquired as part of our acquisitions in 2018 are as follows (in thousands): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions (1) Total All Acquisitions Trade names and trademarks $ 173,946 $ 8,870 $ 182,816 $ 87,306 Customer and supplier relationships 77,980 20,779 98,759 75,450 Software and other technology related assets 33,329 376 33,705 15,757 Covenants not to compete — — — 2,703 Total $ 285,255 $ 30,025 $ 315,280 $ 181,216 (1) The amounts recorded during the year ended December 31, 2018 exclude amounts related to our 2017 acquisitions, including a $5 million adjustment to increase other intangibles related to our 2017 acquisition of Warn. The weighted-average amortization periods for our intangible assets acquired during the years ended December 31, 2018 and 2017 are as follows (in years): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions Total All Acquisitions Trade names and trademarks 18.0 10.0 17.6 11.2 Customer and supplier relationships 3.0 7.9 4.0 18.6 Software and other technology related assets 5.2 6.5 5.2 11.1 Covenants not to compete — — — 4.4 Total acquired finite-lived intangible assets 12.4 8.5 12.0 16.5 Our estimated useful lives for our finite-lived intangible assets are as follows: Method of Amortization Useful Life Trade names and trademarks Straight-line 4-30 years Customer and supplier relationships Accelerated 3-20 years Software and other technology related assets Straight-line 3-15 years Covenants not to compete Straight-line 2-5 years Amortization expense for intangibles was $137 million , $102 million , and $83 million during the years ended December 31, 2018 , 2017 , and 2016 , respectively. Estimated amortization expense for each of the five years in the period ending December 31, 2023 is $140 million , $110 million , $80 million , $66 million and $59 million , respectively.
Stahlgruber Property, Plant Equipment [Table Text Block]	The components of opening property, plant and equipment acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands): Gross Amount Land and improvements $ 47,281 Buildings and improvements 135,628 Machinery and equipment 49,384 Computer equipment and software 3,760 Vehicles and trailers 643 Furniture and fixtures 30,426 Leasehold improvements 1,890 269,012 Construction in progress 2,280 Total property, plant and equipment $ 271,292

Financial Statement Information

Financial Statement Information Property, Plant and Equipment [Table Text Block] (Tables)	12 Months Ended
	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Policy [Policy Text Block]	Property, Plant and Equipment Property, plant and equipment are recorded at cost less accumulated depreciation. Expenditures for major additions and improvements that extend the useful life of the related asset are capitalized. As property, plant and equipment are sold or retired, the applicable cost and accumulated depreciation are removed from the accounts and any resulting gain or loss thereon is recognized. Construction in progress consists primarily of building and land improvements at our existing facilities. Depreciation is calculated using the straight-line method over the estimated useful lives or, in the case of leasehold improvements, the term of the related lease and reasonably assured renewal periods, if shorter. Our estimated useful lives are as follows: Land improvements 10-20 years Buildings and improvements 20-40 years Machinery and equipment 3-20 years Computer equipment and software 3-10 years Vehicles and trailers 3-10 years Furniture and fixtures 5-7 years Property, plant and equipment consists of the following (in thousands): December 31, 2018 2017 Land and improvements $ 177,998 $ 137,790 Buildings and improvements 378,490 233,078 Machinery and equipment 626,615 521,526 Computer equipment and software 143,547 133,753 Vehicles and trailers 176,186 161,269 Furniture and fixtures 58,919 31,794 Leasehold improvements 278,687 257,506 1,840,442 1,476,716 Less—Accumulated depreciation (685,751 ) (606,112 ) Construction in progress 65,471 42,485 Total property, plant and equipment, net $ 1,220,162 $ 913,089 The components of opening property, plant and equipment acquired as part of our acquisition of Stahlgruber in May 2018 are as follows (in thousands): Gross Amount Land and improvements $ 47,281 Buildings and improvements 135,628 Machinery and equipment 49,384 Computer equipment and software 3,760 Vehicles and trailers 643 Furniture and fixtures 30,426 Leasehold improvements 1,890 269,012 Construction in progress 2,280 Total property, plant and equipment $ 271,292 We record depreciation expense associated with our refurbishing, remanufacturing, manufacturing and furnace operations as well as our distribution centers in Cost of goods sold on the Consolidated Statements of Income. All other depreciation expense is reported in Depreciation and amortization. Total depreciation expense for the years ended December 31, 2018, 2017, and 2016 was $157 million , $129 million , and $115 million , respectively.
Property, Plant and Equipment [Table Text Block]	Property, plant and equipment consists of the following (in thousands): December 31, 2018 2017 Land and improvements $ 177,998 $ 137,790 Buildings and improvements 378,490 233,078 Machinery and equipment 626,615 521,526 Computer equipment and software 143,547 133,753 Vehicles and trailers 176,186 161,269 Furniture and fixtures 58,919 31,794 Leasehold improvements 278,687 257,506 1,840,442 1,476,716 Less—Accumulated depreciation (685,751 ) (606,112 ) Construction in progress 65,471 42,485 Total property, plant and equipment, net $ 1,220,162 $ 913,089

Financial Statement Informati_2

Financial Statement Information Finite-Lived Intangible Assets Acquired as Part of Business Combination (Tables)	12 Months Ended
	Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]
Schedule of Goodwill [Table Text Block]	Intangible Assets Intangible assets consist primarily of goodwill (the cost of purchased businesses in excess of the fair value of the identifiable net assets acquired) and other specifically identifiable intangible assets, such as trade names, trademarks, customer and supplier relationships, software and other technology related assets, and covenants not to compete. Goodwill is tested for impairment at least annually, and we performed annual impairment tests during the fourth quarters of 2018 , 2017 and 2016 . Goodwill impairment testing may also be performed on an interim basis when events or circumstances arise that may lead to impairment. The fair value estimates of our reporting units are established using weightings of the results of a discounted cash flow methodology and a comparative market multiples approach. Based on our annual goodwill impairment test in the fourth quarter of 2018, we determined the carrying value of our Aviation reporting unit exceeded the fair value estimate by more than the carrying value, thus we recorded an impairment charge of $33 million , which represented the total carrying value of goodwill in our Aviation reporting unit. The impairment charge was due to a decrease in the fair value estimate from the prior year fair value estimate, primarily driven by a significant deterioration in the outlook for the Aviation reporting unit due to competition, customer financial issues and changing market conditions for the airplane platforms that the business services, which lowered our projected gross margin and related future cash flows. We reported the impairment charge in Impairment of goodwill on the Consolidated Statements of Income for the year ended December 31, 2018. We determined no other impairments existed when we performed our annual impairment testing on the remaining reporting units as all those reporting units had a fair value estimate which exceeded the carrying value by at least approximately 15% , the level at which our Europe reporting unit exceeded its carrying value. The changes in the carrying amount of goodwill by reportable segment are as follows (in thousands): North America Europe Specialty Total Balance as of January 1, 2016 $ 1,433,499 $ 594,482 $ 291,265 $ 2,319,246 Business acquisitions and adjustments to previously recorded goodwill 226,483 614,437 1,889 842,809 Exchange rate effects 1,818 (108,943 ) (161 ) (107,286 ) Balance as of December 31, 2016 $ 1,661,800 $ 1,099,976 $ 292,993 $ 3,054,769 Business acquisitions and adjustments to previously recorded goodwill 39,836 155,366 119,615 314,817 Exchange rate effects 7,718 159,556 (349 ) 166,925 Balance as of December 31, 2017 $ 1,709,354 $ 1,414,898 $ 412,259 $ 3,536,511 Business acquisitions and adjustments to previously recorded goodwill 6,805 970,923 (4,838 ) 972,890 Impairment of goodwill (33,244 ) — — (33,244 ) Exchange rate effects (9,383 ) (85,532 ) 216 (94,699 ) Balance as of December 31, 2018 $ 1,673,532 $ 2,300,289 $ 407,637 $ 4,381,458 Accumulated impairment losses as of December 31, 2018 $ (33,244 ) $ — $ — $ (33,244 ) During the year ended December 31, 2018, we recorded $908 million of goodwill related to our acquisition of Stahlgruber. See Note 2, "Business Combinations" for further information on our acquisitions.
Schedule of Finite-Lived Intangible Assets Acquired as Part of Business Combination [Table Text Block]	The components of intangible assets acquired as part of our acquisitions in 2018 are as follows (in thousands): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions (1) Total All Acquisitions Trade names and trademarks $ 173,946 $ 8,870 $ 182,816 $ 87,306 Customer and supplier relationships 77,980 20,779 98,759 75,450 Software and other technology related assets 33,329 376 33,705 15,757 Covenants not to compete — — — 2,703 Total $ 285,255 $ 30,025 $ 315,280 $ 181,216
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life [Table Text Block]	The weighted-average amortization periods for our intangible assets acquired during the years ended December 31, 2018 and 2017 are as follows (in years): Year Ended Year Ended December 31, 2018 December 31, 2017 Stahlgruber Other Acquisitions Total All Acquisitions Trade names and trademarks 18.0 10.0 17.6 11.2 Customer and supplier relationships 3.0 7.9 4.0 18.6 Software and other technology related assets 5.2 6.5 5.2 11.1 Covenants not to compete — — — 4.4 Total acquired finite-lived intangible assets 12.4 8.5 12.0 16.5

Revenue Recognition Disaggregat

Revenue Recognition Disaggregation of Revenue (Tables)	12 Months Ended
	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Disaggregation of Revenue [Table Text Block]	The following table sets forth our revenue by category, with our parts and services revenue further disaggregated by reportable segment (in thousands): Year Ended December 31, 2018 2017 2016 North America $ 4,558,220 $ 4,278,531 $ 4,009,129 Europe 5,202,231 3,628,906 2,915,841 Specialty 1,472,956 1,301,197 1,219,675 Parts and services 11,233,407 9,208,634 8,144,645 Other 643,267 528,275 439,386 Total revenue $ 11,876,674 $ 9,736,909 $ 8,584,031

Revenue Recognition Product War

Revenue Recognition Product Warranty Liability (Tables)	12 Months Ended
	Dec. 31, 2018
Product Warranties Disclosures [Abstract]
Schedule of Product Warranty Liability [Table Text Block]	The changes in the warranty reserve are as follows (in thousands): Balance as of January 1, 2017 $ 19,634 Warranty expense 38,608 Warranty claims (35,091 ) Balance as of December 31, 2017 23,151 Warranty expense 43,682 Warranty claims (43,571 ) Balance as of December 31, 2018 $ 23,262 The changes in deferred service-type warranty revenue are as follows (in thousands): Balance as of January 1, 2018 $ 19,465 Additional warranty revenue deferred 38,736 Warranty revenue recognized (34,195 ) Balance as of December 31, 2018 $ 24,006

Equity Incentive Plans (Tables)

Equity Incentive Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Unrecognized Compensation Cost, Nonvested Awards [Table Text Block]	As of December 31, 2018 , unrecognized compensation expense related to unvested RSUs is expected to be recognized as follows (in thousands): RSUs 2019 $ 15,166 2020 9,715 2021 6,315 2022 3,458 2023 150 Total unrecognized compensation expense $ 34,804
Schedule of Nonvested Restricted Stock Units Activity	The following table summarizes activity related to our RSUs under the Equity Incentive Plan for the year ended December 31, 2018 : Number Outstanding Weighted Average Grant Date Fair Value Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Unvested as of January 1, 2018 1,624,390 $ 29.94 Granted (2) 601,802 $ 42.58 Vested (704,909 ) $ 30.03 Forfeited / Canceled (45,601 ) $ 33.43 Unvested as of December 31, 2018 1,475,682 $ 34.94 Expected to vest after December 31, 2018 1,351,169 $ 34.89 2.3 $ 32,063
Schedule of Share-based Compensation, Stock Options, Activity	The following table summarizes activity related to our stock options under the Equity Incentive Plan for the year ended December 31, 2018 : Number Outstanding Weighted Average Exercise Price Weighted Average Remaining Contractual Term (in years) Aggregate Intrinsic Value (in thousands) (1) Balance as of January 1, 2018 1,738,073 $ 9.20 Exercised (686,070 ) $ 7.73 $ 17,504 Canceled (509 ) $ 32.31 Balance as of December 31, 2018 1,051,494 $ 10.15 0.9 $ 14,570 Exercisable as of December 31, 2018 1,051,494 $ 10.15 0.9 $ 14,570

Earnings Per Share Schedule of

Earnings Per Share Schedule of Earnings Per Share, Basic and Diluted (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]	The following chart sets forth the computation of earnings per share (in thousands, except per share amounts): Year Ended December 31, 2018 2017 2016 Income from continuing operations $ 487,565 $ 536,974 $ 456,123 Denominator for basic earnings per share—Weighted-average shares outstanding 314,428 308,607 306,897 Effect of dilutive securities: RSUs 409 544 689 Stock options 1,012 1,498 2,198 Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding 315,849 310,649 309,784 Basic earnings per share from continuing operations $ 1.55 $ 1.74 $ 1.49 Diluted earnings per share from continuing operations $ 1.54 $ 1.73 $ 1.47

Earnings Per Share Schedule o_2

Earnings Per Share Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]	The following table sets forth the number of employee stock-based compensation awards outstanding but not included in the computation of diluted earnings per share because their effect would have been antidilutive for the years ended December 31, 2018 , 2017 , and 2016 (in thousands): Year Ended December 31, 2018 2017 2016 Antidilutive securities: RSUs 410 37 57 Stock options 8 39 63

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Foreign Unrealized (Loss) Gain Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Balance at January 1, 2016 $ (96,890 ) $ (932 ) $ (7,648 ) $ — $ (105,470 ) Pretax (loss) income (175,639 ) 12,382 7,175 — (156,082 ) Income tax effect — (4,581 ) (2,636 ) — (7,217 ) Reclassification of unrealized loss (gain) — 1,789 496 — 2,285 Reclassification of deferred income taxes — (567 ) (124 ) — (691 ) Balance at December 31, 2016 $ (272,529 ) $ 8,091 $ (2,737 ) $ — $ (267,175 ) Pretax income (loss) 206,451 (44,550 ) 361 — 162,262 Income tax effect (7,366 ) 16,390 (100 ) — 8,924 Reclassification of unrealized loss (gain) — 50,090 (3,519 ) — 46,571 Reclassification of deferred income taxes — (18,483 ) 659 — (17,824 ) Disposal of business, net 1,511 — (3,436 ) — (1,925 ) Other comprehensive loss from unconsolidated subsidiaries — — — (1,309 ) (1,309 ) Balance at December 31, 2017 $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax (loss) income (113,030 ) 37,552 1,132 — (74,346 ) Income tax effect 4,507 (8,846 ) (403 ) — (4,742 ) Reclassification of unrealized (gain) loss — (37,009 ) (54 ) — (37,063 ) Reclassification of deferred income taxes — 8,653 22 — 8,675 Other comprehensive loss from unconsolidated subsidiaries — — — (2,343 ) (2,343 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Balance at December 31, 2018 $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Accumulated Other Comprehensive Income (Loss) The components of Accumulated Other Comprehensive Income (Loss) are as follows (in thousands): Foreign Unrealized (Loss) Gain Unrealized (Loss) Gain Other Comprehensive Loss from Unconsolidated Subsidiaries Accumulated Balance at January 1, 2016 $ (96,890 ) $ (932 ) $ (7,648 ) $ — $ (105,470 ) Pretax (loss) income (175,639 ) 12,382 7,175 — (156,082 ) Income tax effect — (4,581 ) (2,636 ) — (7,217 ) Reclassification of unrealized loss (gain) — 1,789 496 — 2,285 Reclassification of deferred income taxes — (567 ) (124 ) — (691 ) Balance at December 31, 2016 $ (272,529 ) $ 8,091 $ (2,737 ) $ — $ (267,175 ) Pretax income (loss) 206,451 (44,550 ) 361 — 162,262 Income tax effect (7,366 ) 16,390 (100 ) — 8,924 Reclassification of unrealized loss (gain) — 50,090 (3,519 ) — 46,571 Reclassification of deferred income taxes — (18,483 ) 659 — (17,824 ) Disposal of business, net 1,511 — (3,436 ) — (1,925 ) Other comprehensive loss from unconsolidated subsidiaries — — — (1,309 ) (1,309 ) Balance at December 31, 2017 $ (71,933 ) $ 11,538 $ (8,772 ) $ (1,309 ) $ (70,476 ) Pretax (loss) income (113,030 ) 37,552 1,132 — (74,346 ) Income tax effect 4,507 (8,846 ) (403 ) — (4,742 ) Reclassification of unrealized (gain) loss — (37,009 ) (54 ) — (37,063 ) Reclassification of deferred income taxes — 8,653 22 — 8,675 Other comprehensive loss from unconsolidated subsidiaries — — — (2,343 ) (2,343 ) Adoption of ASU 2018-02 2,859 2,486 — — 5,345 Balance at December 31, 2018 $ (177,597 ) $ 14,374 $ (8,075 ) $ (3,652 ) $ (174,950 ) Net unrealized gains on our interest rate swaps, inclusive of our interest rate swap agreements and the interest rate swap component of our cross currency swaps, totaling $7 million in the year ended December 31, 2018 were reclassified to Interest expense in our Consolidated Statements of Income, compared to losses of $2 million , and $4 million for the years ended December 31, 2017 and 2016 , respectively. We also reclassified gains of $9 million to Interest expense related to the foreign currency forward component of our cross currency swaps during each of the years ended December 31, 2018 and 2017 ; the amount reclassified during the year ended December 31, 2016 was immaterial. Also related to our cross currency swaps, we reclassified gains of $21 million and $2 million to Interest income and other income, net in our Consolidated Statements of Income during the years ended December 31, 2018 and 2016, respectively, compared to losses of $57 million during the year ended December 31, 2017 ; these gains and losses offset the impact of the remeasurement of the underlying contracts. The deferred income taxes related to our cash flow hedges were reclassified from Accumulated other comprehensive income (loss) to provision for income taxes. Reclassifications of unrealized gains and losses related to our pension plans were reclassified from Accumulated other comprehensive income (loss) to Interest income and other income, net; the related deferred taxes were reclassified from Accumulated other comprehensive income (loss) to provision for income taxes. As a result of the adoption of ASU 2018-02 in the first quarter of 2018, we recorded a $5 million reclassification to increase Accumulated Other Comprehensive (Loss) Income and decrease Retained Earnings. See Note 4, "Summary of Significant Accounting Policies " for further information regarding the adoption of ASU 2018-02.

Long-Term Obligations (Tables)

Long-Term Obligations (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule Of Long-Term Obligations	Long-term obligations consist of the following (in thousands): December 31, 2018 2017 Senior secured credit agreement: Term loans payable $ 350,000 $ 704,800 Revolving credit facilities 1,387,177 1,283,551 U.S. Notes (2023) 600,000 600,000 Euro Notes (2024) 573,350 600,150 Euro Notes (2026/28) 1,146,700 — Receivables securitization facility 110,000 100,000 Notes payable through May 2027 at weighted average interest rates of 2.0% and 1.4%, respectively 23,056 29,146 Other long-term debt at weighted average interest rates of 2.5% and 1.7%, respectively 157,414 110,633 Total debt 4,347,697 3,428,280 Less: long-term debt issuance costs (36,906 ) (21,476 ) Less: current debt issuance costs (291 ) (2,824 ) Total debt, net of debt issuance costs 4,310,500 3,403,980 Less: current maturities, net of debt issuance costs (121,826 ) (126,360 ) Long term debt, net of debt issuance costs $ 4,188,674 $ 3,277,620
Schedule of Maturities of Long-term Debt [Table Text Block]	The scheduled maturities of long-term obligations outstanding at December 31, 2018 are as follows (in thousands): 2019 $ 122,117 2020 49,193 2021 137,192 2022 24,410 2023 621,560 Thereafter 3,393,225 Total debt (1) $ 4,347,697 (1) The total debt amounts presented above exclude debt issuance costs totaling $37 million as of December 31, 2018.

Derivative Instruments and He_2

Derivative Instruments and Hedging Activities (Tables)	12 Months Ended
	Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following tables present information about our financial assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs we utilized to determine such fair value as of December 31, 2018 and December 31, 2017 (in thousands): Balance as of December 31, 2018 Fair Value Measurements as of December 31, 2018 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 47,649 $ — $ 47,649 $ — Interest rate swaps 14,967 — 14,967 — Cross currency swap agreements 7,880 — 7,880 — Total Assets $ 70,496 $ — $ 70,496 $ — Liabilities: Contingent consideration liabilities $ 5,209 $ — $ — $ 5,209 Deferred compensation liabilities 48,984 — 48,984 — Cross currency swap agreements 40,997 — 40,997 — Total Liabilities $ 95,190 $ — $ 89,981 $ 5,209 Balance as of December 31, 2017 Fair Value Measurements as of December 31, 2017 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 45,984 $ — $ 45,984 $ — Interest rate swaps 19,102 — 19,102 — Cross currency swap agreements 5,504 — 5,504 — Total Assets $ 70,590 $ — $ 70,590 $ — Liabilities: Contingent consideration liabilities $ 2,636 $ — $ — $ 2,636 Deferred compensation liabilities 47,199 — 47,199 — Cross currency swap agreements 61,492 — 61,492 — Total Liabilities $ 111,327 $ — $ 108,691 $ 2,636
Schedule of Derivative Instruments [Table Text Block]	The following table summarizes the notional amounts and fair values of our designated cash flow hedges as of December 31, 2018 and 2017 (in thousands): Notional Amount Fair Value at December 31, 2018 (USD) December 31, 2018 Other Current Assets Other Assets Other Accrued Expenses Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 480,000 $ — $ 14,967 $ — $ — Cross currency swap agreements USD/euro $ 574,315 211 7,669 127 40,870 Total cash flow hedges $ 211 $ 22,636 $ 127 $ 40,870 Notional Amount Fair Value at December 31, 2017 (USD) December 31, 2017 Other Assets Other Noncurrent Liabilities Interest rate swap agreements USD denominated $ 590,000 $ 19,102 $ — Cross currency swap agreements USD/euro $ 406,546 5,504 61,492 Total cash flow hedges $ 24,606 $ 61,492

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The following tables present information about our financial assets and liabilities measured at fair value on a recurring basis and indicate the fair value hierarchy of the valuation inputs we utilized to determine such fair value as of December 31, 2018 and December 31, 2017 (in thousands): Balance as of December 31, 2018 Fair Value Measurements as of December 31, 2018 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 47,649 $ — $ 47,649 $ — Interest rate swaps 14,967 — 14,967 — Cross currency swap agreements 7,880 — 7,880 — Total Assets $ 70,496 $ — $ 70,496 $ — Liabilities: Contingent consideration liabilities $ 5,209 $ — $ — $ 5,209 Deferred compensation liabilities 48,984 — 48,984 — Cross currency swap agreements 40,997 — 40,997 — Total Liabilities $ 95,190 $ — $ 89,981 $ 5,209 Balance as of December 31, 2017 Fair Value Measurements as of December 31, 2017 Level 1 Level 2 Level 3 Assets: Cash surrender value of life insurance $ 45,984 $ — $ 45,984 $ — Interest rate swaps 19,102 — 19,102 — Cross currency swap agreements 5,504 — 5,504 — Total Assets $ 70,590 $ — $ 70,590 $ — Liabilities: Contingent consideration liabilities $ 2,636 $ — $ — $ 2,636 Deferred compensation liabilities 47,199 — 47,199 — Cross currency swap agreements 61,492 — 61,492 — Total Liabilities $ 111,327 $ — $ 108,691 $ 2,636

Income Taxes Income Taxes (Tabl

Income Taxes Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2018
Schedule Of Components Of Income Tax Expense (Benefit)	The provision for income taxes consists of the following components (in thousands): Year Ended December 31, 2018 2017 2016 Current: Federal $ 90,216 $ 196,825 $ 159,547 State 25,851 27,149 27,120 Foreign 77,508 58,123 45,545 Total current provision for income taxes $ 193,575 $ 282,097 $ 232,212 Deferred: Federal $ 14,977 $ (37,486 ) $ 1,169 State 4,386 4,044 2,131 Foreign (21,543 ) (13,095 ) (14,946 ) Total deferred benefit for income taxes $ (2,180 ) $ (46,537 ) $ (11,646 ) Provision for income taxes $ 191,395 $ 235,560 $ 220,566
Schedule Of Income from Continuing Operations Before Provision for Income Taxes, Domestic and Foreign	Income taxes have been based on the following components of income from continuing operations before provision for income taxes (in thousands): Year Ended December 31, 2018 2017 2016 Domestic $ 562,758 $ 575,148 $ 513,844 Foreign 180,673 191,479 163,437 Income from continuing operations before provision for income taxes $ 743,431 $ 766,627 $ 677,281
Schedule Of Effective Income Tax Rate Reconciliation	The U.S. federal statutory rate is reconciled to the effective tax rate as follows: Year Ended December 31, 2018 2017 2016 U.S. federal statutory rate 21.0 % 35.0 % 35.0 % U.S. federal tax reform - federal deferred tax rate change — % (9.5 )% — % U.S. federal tax reform - transition tax on foreign earnings (1.3 )% 6.6 % — % State income taxes, net of state credits and federal tax impact 3.5 % 2.8 % 2.7 % Impact of rates on international operations 0.9 % (3.2 )% (3.2 )% Notional interest deductions (0.6 )% (0.9 )% (2.5 )% Excess tax benefits from stock-based compensation (0.6 )% (1.0 )% (1.6 )% Non-deductible expenses 1.6 % 1.1 % 1.3 % Other, net 1.2 % (0.2 )% 0.9 % Effective tax rate 25.7 % 30.7 % 32.6 %
Schedule Of Deferred Tax Assets and Liabilities	The significant components of our deferred tax assets and liabilities are as follows (in thousands): December 31, 2018 2017 Deferred Tax Assets: Accrued expenses and reserves $ 60,337 $ 40,317 Qualified and nonqualified retirement plans 20,525 19,074 Inventory 15,474 17,886 Accounts receivable 16,208 16,036 Interest deduction carryforwards 20,392 13,845 Stock-based compensation 4,859 4,963 Net operating loss carryforwards 13,222 11,734 Other 12,370 8,971 Total deferred tax assets, gross 163,387 132,826 Less: valuation allowance (34,779 ) (21,527 ) Total deferred tax assets $ 128,608 $ 111,299 Deferred Tax Liabilities: Goodwill and other intangible assets $ 216,699 $ 192,688 Property, plant and equipment 87,839 67,467 Trade name 116,615 72,233 Other 15,511 16,165 Total deferred tax liabilities $ 436,664 $ 348,553 Net deferred tax liability $ (308,056 ) $ (237,254 )
Schedule Of Deferred Tax Assets And Liabilities Classification	Deferred tax assets and liabilities are reflected on our Consolidated Balance Sheets as follows (in thousands): December 31, 2018 2017 Noncurrent deferred tax assets $ 3,378 $ 15,105 Noncurrent deferred tax liabilities 311,434 252,359
Schedule Of Unrecognized Tax Benefits Rollforward	A reconciliation of the beginning and ending amount of gross unrecognized tax benefits is as follows (in thousands): 2018 2017 2016 Balance at January 1 $ 1,690 $ 2,146 $ 2,273 Additions for acquired tax positions — 73 — Additions based on tax positions related to the current year 5 5 5 Lapse of statutes of limitations (458 ) (534 ) (132 ) Balance at December 31 $ 1,237 $ 1,690 $ 2,146

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Schedule of Expected Benefit Payments [Table Text Block]	The following table summarizes estimated future benefit payments as of December 31, 2018 (in thousands): Year Ended December 31, Amount 2019 $ 5,818 2020 5,627 2021 6,263 2022 6,966 2023 6,948 2024 - 2028 39,823
Pension and Other Postretirement Benefits Disclosure [Text Block]	Employee Benefit Plans Defined Benefit Plans We have funded and unfunded defined benefit plans covering certain employee groups in the U.S. and various European countries. Local statutory requirements govern many of our European plans. The defined benefit plans are plans are mostly closed to new participants and, in some cases, existing participants no longer accrue benefits. Funded Status The table below summarizes the funded status of our defined benefit plans (in thousands): December 31, 2018 2017 Change in projected benefit obligation: Projected benefit obligation - beginning of year $ 126,031 $ 111,547 Acquisitions (1) 79,211 938 Service cost 3,215 4,525 Interest cost 3,476 3,670 Participant contributions 415 573 Actuarial (gain) / loss (989 ) 4,539 Benefits paid (2) (4,447 ) (3,806 ) Curtailment (3) — (4,064 ) Settlement (756 ) (245 ) Currency impact (4,664 ) 8,354 Projected benefit obligation - end of year $ 201,492 $ 126,031 Change in fair value of plan assets: Fair value - beginning of year $ 82,852 $ 73,057 Acquisitions (1) 251 — Actual return on plan assets 3,018 3,307 Employer contributions 9,975 2,931 Participant contributions 415 573 Benefits paid (2,788 ) (3,040 ) Currency impact (2,051 ) 6,024 Fair value - end of year $ 91,672 $ 82,852 Funded status at end of year (liability) $ (109,820 ) $ (43,179 ) Accumulated benefit obligation $ 199,337 $ 125,389 (1) 2018 amounts relate primarily to the addition of plans in connection with our acquisition of Stahlgruber. (2) Includes amounts paid from plan assets as well as amounts paid from Company assets. (3) In 2017, we froze one of our Europe pension plans, resulting in a curtailment. No additional participants may join this plan and as of December 31, 2017, participants no longer accrue future benefits under this plan. The net amounts recognized for defined benefit plans in the Consolidated Balance Sheets were as follows (in thousands): December 31, 2018 2017 Non-current assets $ 377 $ — Current liabilities (3,280 ) — Non-current liabilities (106,917 ) (43,179 ) $ (109,820 ) $ (43,179 ) The following table summarizes the accumulated benefit obligation and aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets (in thousands): December 31, 2018 2017 Accumulated benefit obligation $ 169,097 $ 125,389 Aggregate fair value of plan assets 60,988 82,852 The following table summarizes the projected benefit obligation and aggregate fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets (in thousands): December 31, 2018 2017 Projected benefit obligation $ 171,185 $ 126,031 Aggregate fair value of plan assets 60,988 82,852 The table below summarizes the weighted-average assumptions used to calculate the year-end benefit obligations: 2018 2017 Discount rate used to determine benefit obligation 2.1 % 2.1 % Rate of future compensation increase 0.9 % 1.3 % Net Periodic Benefit Cost The table below summarizes the components of net periodic benefit cost for our defined benefit plans (in thousands): Year Ended December 31, 2018 2017 2016 Service cost $ 3,215 $ 4,525 $ 3,843 Interest cost 3,476 3,670 2,719 Expected return on plan assets (1) (2,949 ) (2,467 ) (2,624 ) Amortization of prior service credit — (181 ) (266 ) Amortization of actuarial (gain) loss (2) (54 ) 473 762 Curtailment gain — (3,811 ) — Settlement (gain) / loss 74 (4 ) 2 Net periodic benefit cost $ 3,762 $ 2,205 $ 4,436 (1) We use the fair value of our plan assets to calculate the expected return on plan assets. (2) Actuarial gains and losses are amortized using a corridor approach. Gains and losses are amortized if, as of the beginning of the year, the cumulative net gain or loss exceeds 10 percent of the greater of the projected benefit obligation or the fair value of the plan assets. Gains and losses in excess of the corridor are amortized over the average remaining service period of active members expected to receive benefits under the plan or, in the case of closed plans, the expected future lifetime of the employees participating in the plan. For the years ended December 31, 2018 and 2017, the service cost component of net periodic benefit cost was classified in Selling, general and administrative expenses, while the other components of net periodic benefit cost were classified in Other income, net in our Consolidated Statements of Income. For the year ended December 31, 2016, all components of net periodic benefit expense were included in Selling, general, and administrative expenses in our Consolidated Statements of Income. For the year ending December 31, 2019, we expect net periodic benefit costs to increase by approximately $2 million due to the fact that we will incur a full year of pension expense related to our Stahlgruber business, compared to a partial year in 2018. The table below summarizes the weighted-average assumptions used to calculate the net periodic benefit cost in the table above: 2018 2017 2016 Discount rate used to determine service cost 1.3 % 1.5 % 1.6 % Discount rate used to determine interest cost 2.5 % 3.0 % 3.0 % Rate of future compensation increase 1.9 % 1.3 % 2.0 % Expected long-term return on plan assets (1) 4.8 % 5.0 % 5.1 % (1) Our expected long-term return on plan assets is determined based on our asset allocation and estimate of future long-term returns by asset class. Assumed mortality is also a key assumption in determining benefit obligations and net periodic benefit cost. In some of our European plans, a price inflation index is also an assumption in determining benefit obligations and net periodic benefit cost. As of December 31, 2018 , the pre-tax amounts recognized in Accumulated other comprehensive income consisted of $10 million of net actuarial losses for our defined benefit plans that have not yet been recognized in net periodic benefit cost. Of this amount, we expect $0.2 million to be recognized as a component of net periodic benefit cost during the year ending December 31, 2019. Fair Value of Plan Assets Fair value is defined as the amount that would be received for selling an asset or paid to transfer a liability in an orderly transaction between market participants. The tiers in the fair value hierarchy include: Level 1, defined as observable inputs such as quoted market prices in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as significant unobservable inputs in which little or no market data exists, therefore requiring an entity to develop its own assumptions. Investments that are valued using net asset value ("NAV") (or its equivalent) as a practical expedient are excluded from the fair value hierarchy disclosure. The following is a description of the valuation methodologies used for assets reported at fair value. The methodologies used at December 31, 2018 and December 31, 2017 are the same. Level 1 investments: Cash and cash equivalents are valued based on cost, which approximates fair value. Mutual funds are valued based on reported market prices on the last trading day of the fiscal year. Level 3 investments: Investments in insurance contracts represent the cash surrender value of the insurance policy. These are actuarially determined amounts based on projections of future benefit payments, discount rates, and expected long-term rate of return on assets. For our unfunded pension plans, the Company pays the defined benefit plan obligations when they become due. The table below summarizes the fair value of our defined benefit plan assets by asset category within the fair value hierarchy for our funded defined benefit pension plans (in thousands): December 31, 2018 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash and cash equivalents (1) $ 30,684 $ — $ — $ 30,684 $ 369 $ — $ — $ 369 Mutual funds (2) — — — — 21,709 — — 21,709 Insurance contracts — — 60,988 60,988 — — 60,774 60,774 Total investments at fair value $ 30,684 $ — $ 60,988 $ 91,672 $ 22,078 $ — $ 60,774 $ 82,852 (1) Consists of institutional short-term investment funds. (2) Mutual funds consist of investments in equity securities, fixed-income securities, and real estate. The following table summarizes the changes in fair value measurements of Level 3 investments for our defined benefit plans (in thousands): December 31, 2018 2017 Balance at beginning of year $ 60,774 $ 53,803 Actual return on plan assets: Relating to assets held at the reporting date 2,556 464 Purchases, sales and settlements (541 ) 483 Transfers in and/or out of Level 3 255 — Currency impact (2,056 ) 6,024 Balance at end of year $ 60,988 $ 60,774 Assets for our defined benefit pension plans in Europe are invested in insurance policies. Under these contracts, we pay premiums to the insurance company, which are based on an internal actuarial analysis performed by the insurance company; the insurance company then funds the pension payments to the plan participants upon retirement. The assets for our U.S. plan are managed by a master trust, with oversight responsibility by our Benefits Committee. As of December 31, 2018, our pension assets for our U.S. pension plan are fully invested in money market funds. The investment strategy for our U.S. plan is to invest in low risk investments to protect our principal balance. The investment policy and allocation of the assets in the master trust were approved by our Benefits Committee. Employer Contributions and Estimated Future Benefit Payments During the year ended December 31, 2018 , we contributed $12 million to our pension plans. We estimate that contributions to our pension plans during 2019 will be $4 million . The following table summarizes estimated future benefit payments as of December 31, 2018 (in thousands): Year Ended December 31, Amount 2019 $ 5,818 2020 5,627 2021 6,263 2022 6,966 2023 6,948 2024 - 2028 39,823
Schedule Of Changes In Projected Benefit Obligations And Fair Value Of Plan Assets [Table Text Block]	The table below summarizes the funded status of our defined benefit plans (in thousands): December 31, 2018 2017 Change in projected benefit obligation: Projected benefit obligation - beginning of year $ 126,031 $ 111,547 Acquisitions (1) 79,211 938 Service cost 3,215 4,525 Interest cost 3,476 3,670 Participant contributions 415 573 Actuarial (gain) / loss (989 ) 4,539 Benefits paid (2) (4,447 ) (3,806 ) Curtailment (3) — (4,064 ) Settlement (756 ) (245 ) Currency impact (4,664 ) 8,354 Projected benefit obligation - end of year $ 201,492 $ 126,031 Change in fair value of plan assets: Fair value - beginning of year $ 82,852 $ 73,057 Acquisitions (1) 251 — Actual return on plan assets 3,018 3,307 Employer contributions 9,975 2,931 Participant contributions 415 573 Benefits paid (2,788 ) (3,040 ) Currency impact (2,051 ) 6,024 Fair value - end of year $ 91,672 $ 82,852 Funded status at end of year (liability) $ (109,820 ) $ (43,179 ) Accumulated benefit obligation $ 199,337 $ 125,389
Schedule of Amounts Recognized in Balance Sheet [Table Text Block]	The net amounts recognized for defined benefit plans in the Consolidated Balance Sheets were as follows (in thousands): December 31, 2018 2017 Non-current assets $ 377 $ — Current liabilities (3,280 ) — Non-current liabilities (106,917 ) (43,179 ) $ (109,820 ) $ (43,179 )
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The following table summarizes the accumulated benefit obligation and aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets (in thousands): December 31, 2018 2017 Accumulated benefit obligation $ 169,097 $ 125,389 Aggregate fair value of plan assets 60,988 82,852
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]	The following table summarizes the projected benefit obligation and aggregate fair value of plan assets for pension plans with projected benefit obligations in excess of plan assets (in thousands): December 31, 2018 2017 Projected benefit obligation $ 171,185 $ 126,031 Aggregate fair value of plan assets 60,988 82,852
Schedule of Assumptions Used [Table Text Block]	The table below summarizes the weighted-average assumptions used to calculate the net periodic benefit cost in the table above: 2018 2017 2016 Discount rate used to determine service cost 1.3 % 1.5 % 1.6 % Discount rate used to determine interest cost 2.5 % 3.0 % 3.0 % Rate of future compensation increase 1.9 % 1.3 % 2.0 % Expected long-term return on plan assets (1) 4.8 % 5.0 % 5.1 % The table below summarizes the weighted-average assumptions used to calculate the year-end benefit obligations: 2018 2017 Discount rate used to determine benefit obligation 2.1 % 2.1 % Rate of future compensation increase 0.9 % 1.3 %
Equity Method Investments [Policy Text Block]	Investments in Unconsolidated Subsidiaries Our investment in unconsolidated subsidiaries was $179 million and $208 million as of December 31, 2018 and December 31, 2017, respectively. On December 1, 2016 , we acquired a 26.5% equity interest in Mekonomen AB ("Mekonomen") for an aggregate purchase price of $181 million . Headquartered in Stockholm, Sweden, Mekonomen is a leading independent car parts and service chain in northern Europe, offering a range of products including spare parts and accessories for cars, and workshop services for consumers and businesses. As a result of the investment, we nominated two representatives for election to Mekonomen's board of directors; both representatives were subsequently elected to and continue to serve on the board of directors, including one as the chairman of the board. We are accounting for our interest in Mekonomen using the equity method of accounting, as our investment gives us the ability to exercise significant influence, but not control, over the investee. As of December 31, 2018, the book value of our investment in Mekonomen exceeded our share of the book value of Mekonomen's net assets by $85 million ; this difference is primarily related to goodwill and the fair value of other intangible assets. We are recording our equity in the net earnings of Mekonomen on a one quarter lag. We recorded equity losses of $64 million during the year ended December 31, 2018, and equity in earnings of $7 million during the year ended December 31, 2017 related to our investment in Mekonomen, including adjustments to convert the results to GAAP and to recognize the impact of our purchase accounting adjustments. In May 2018 and May 2017, we received cash dividends of $8 million (SEK 67 million ) and $7 million (SEK 67 million ), respectively, related to our investment in Mekonomen. Mekonomen announced in February 2019 that the Mekonomen Board of Directors has proposed no dividend payments in 2019. On July 6, 2018, Mekonomen announced the acquisition of two automotive spare parts distributors in Denmark and Poland. The objective of the acquisition was to strengthen Mekonomen's position in the sale of automotive spare parts in northern Europe and to establish a strong market position in Denmark and Poland, where Mekonomen previously had no operations. The acquisition was partially financed by a rights issue with preferential rights for Mekonomen's existing shareholders, who were given the right to subscribe for four new Mekonomen shares per seven existing owned shares at a discounted share price. On October 5, 2018, we subscribed for our pro rata share in the rights issue giving us the right to acquire an additional $48 million of equity in Mekonomen at a discounted share price, increasing our equity interest to 26.6% . During the third quarter of 2018, we recorded a derivative instrument of $29 million in Other assets on our Consolidated Balance Sheets, which represented our right to acquire Mekonomen shares at a discount. In the third quarter of 2018, we measured the derivative instrument at fair value, and we recorded a $3 million gain on our fair value remeasurement. We acquired the additional $48 million of equity in Mekonomen in October 2018. In the fourth quarter, we recorded an $8 million loss related to the settlement of the derivative instrument in October 2018 due to a decrease in the Mekonomen share price from the last day of the third quarter to the settlement date. The net derivative loss of $5 million is recorded in Interest income and other income, net on the Consolidated Statements of Income. We evaluated our investment in Mekonomen for other-than-temporary impairment as of December 31, 2018, and concluded the decline in fair value was other-than-temporary due to a significant stock price decrease since September 30, 2018. Therefore, we recognized an other-than-temporary impairment of $48 million , which represented the difference in the carrying value and the fair value of our investment in Mekonomen. The fair value of our investment in Mekonomen was determined using the Mekonomen share price of SEK 92 as of December 31, 2018. During the third quarter of 2018, we had recognized an other-than-temporary impairment of $23 million due to a prolonged and significant stock price decrease; the fair value was determined using the Mekonomen share price of SEK 126 as of September 30, 2018. The impairment charges are recorded in Equity in (losses) earnings of unconsolidated subsidiaries in our Consolidated Statements of Income. Equity in losses and earnings from our investment in Mekonomen are reported in the Europe segment. As a result of the impairment charge in the fourth quarter, the Level 1 fair value of our equity investment in the publicly traded Mekonomen common stock at December 31, 2018 approximated the carrying value of $154 million . From year-end to February 22, 2019, the Mekonomen share price declined to SEK 69 , or 24.9% relative to the December 31, 2018 share price. This further decrease creates the potential for an additional other-than-temporary impairment charge in 2019.
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]	The components of pre-tax stock-based compensation expense for our continuing operations are as follows (in thousands): Year Ended December 31, 2018 2017 2016 RSUs $ 22,760 $ 22,826 $ 22,183 Stock options and other — 6 162 Total stock-based compensation expense $ 22,760 $ 22,832 $ 22,345
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Table Text Block]	The following table sets forth the classification of total stock-based compensation expense included in our Consolidated Statements of Income for our continuing operations (in thousands): Year Ended December 31, 2018 2017 2016 Cost of goods sold $ 469 $ 434 $ 407 Selling, general and administrative expenses 22,291 22,398 21,938 Total stock-based compensation expense 22,760 22,832 22,345 Income tax benefit (5,220 ) (5,459 ) (8,268 ) Total stock-based compensation expense, net of tax $ 17,540 $ 17,373 $ 14,077 We have not capitalized any stock-based compensation costs during the years ended December 31, 2018 , 2017 , and 2016 .
Schedule of Net Benefit Costs [Table Text Block]	The table below summarizes the components of net periodic benefit cost for our defined benefit plans (in thousands): Year Ended December 31, 2018 2017 2016 Service cost $ 3,215 $ 4,525 $ 3,843 Interest cost 3,476 3,670 2,719 Expected return on plan assets (1) (2,949 ) (2,467 ) (2,624 ) Amortization of prior service credit — (181 ) (266 ) Amortization of actuarial (gain) loss (2) (54 ) 473 762 Curtailment gain — (3,811 ) — Settlement (gain) / loss 74 (4 ) 2 Net periodic benefit cost $ 3,762 $ 2,205 $ 4,436
Schedule of Allocation of Plan Assets [Table Text Block]	The table below summarizes the fair value of our defined benefit plan assets by asset category within the fair value hierarchy for our funded defined benefit pension plans (in thousands): December 31, 2018 2017 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Cash and cash equivalents (1) $ 30,684 $ — $ — $ 30,684 $ 369 $ — $ — $ 369 Mutual funds (2) — — — — 21,709 — — 21,709 Insurance contracts — — 60,988 60,988 — — 60,774 60,774 Total investments at fair value $ 30,684 $ — $ 60,988 $ 91,672 $ 22,078 $ — $ 60,774 $ 82,852
Change In Fair Value Of Plan Assets Level 3 [Table Text Block]	The following table summarizes the changes in fair value measurements of Level 3 investments for our defined benefit plans (in thousands): December 31, 2018 2017 Balance at beginning of year $ 60,774 $ 53,803 Actual return on plan assets: Relating to assets held at the reporting date 2,556 464 Purchases, sales and settlements (541 ) 483 Transfers in and/or out of Level 3 255 — Currency impact (2,056 ) 6,024 Balance at end of year $ 60,988 $ 60,774

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Future Minimum Lease Commitments	The future minimum lease commitments under these leases at December 31, 2018 are as follows (in thousands): Years ending December 31: 2019 $ 294,269 2020 256,172 2021 210,632 2022 158,763 2023 131,518 Thereafter 777,165 Future Minimum Lease Payments $ 1,828,519

Segment and Geographic Inform_2

Segment and Geographic Information (Tables)	12 Months Ended
	Dec. 31, 2018
Segment Reporting [Abstract]
Schedule Of Financial Performance By Reportable Segment	The following tables present our financial performance by reportable segment for the periods indicated (in thousands): North America Europe Specialty Eliminations Consolidated Year Ended December 31, 2018 Revenue: Third Party $ 5,181,964 $ 5,221,754 $ 1,472,956 $ — $ 11,876,674 Intersegment 645 — 4,724 (5,369 ) — Total segment revenue $ 5,182,609 $ 5,221,754 $ 1,477,680 $ (5,369 ) $ 11,876,674 Segment EBITDA $ 660,153 $ 422,721 $ 168,525 $ — $ 1,251,399 Depreciation and amortization (1) 87,348 178,473 28,256 — 294,077 Year Ended December 31, 2017 Revenue: Third Party $ 4,798,901 $ 3,636,811 $ 1,301,197 $ — $ 9,736,909 Intersegment 750 — 4,319 (5,069 ) — Total segment revenue $ 4,799,651 $ 3,636,811 $ 1,305,516 $ (5,069 ) $ 9,736,909 Segment EBITDA $ 655,275 $ 319,156 $ 142,159 $ — $ 1,116,590 Depreciation and amortization (1) 86,303 120,805 23,095 — 230,203 Year Ended December 31, 2016 Revenue: Third Party $ 4,443,886 $ 2,920,470 $ 1,219,675 $ — $ 8,584,031 Intersegment 739 — 4,048 (4,787 ) — Total segment revenue $ 4,444,625 $ 2,920,470 $ 1,223,723 $ (4,787 ) $ 8,584,031 Segment EBITDA $ 589,945 $ 283,608 $ 131,427 $ — $ 1,004,980 Depreciation and amortization (1) 80,923 94,979 22,432 — 198,334
Reconciliation Of Segment EBITDA To Net Income Table	The table below provides a reconciliation of Net Income to Segment EBITDA (in thousands): Year Ended December 31, 2018 2017 2016 Net income $ 483,168 $ 530,228 $ 463,975 Less: net income (loss) attributable to noncontrolling interest 3,050 (3,516 ) — Net income attributable to LKQ stockholders 480,118 533,744 463,975 Subtract: Net (loss) income from discontinued operations (4,397 ) (6,746 ) 7,852 Net income from continuing operations attributable to LKQ stockholders 484,515 540,490 456,123 Add: Depreciation and amortization 274,213 219,546 191,433 Depreciation and amortization - cost of goods sold 19,864 10,657 6,901 Interest expense, net of interest income 144,536 100,620 87,682 Loss on debt extinguishment 1,350 456 26,650 Provision for income taxes 191,395 235,560 220,566 EBITDA 1,115,873 1,107,329 989,355 Subtract: Equity in (losses) earnings of unconsolidated subsidiaries (1) (64,471 ) 5,907 (592 ) Fair value loss on Mekonomen derivative instrument (1) (5,168 ) — — Gains on foreign exchange contracts - acquisition related (2) — — 18,342 Gains on bargain purchases (3) 2,418 3,870 8,207 Add: Restructuring and acquisition related expenses (4) 32,428 19,672 37,762 Inventory step-up adjustment - acquisition related 403 3,584 3,614 Impairment of goodwill (1) 33,244 — — Impairment of net assets held for sale 2,438 — — Change in fair value of contingent consideration liabilities (208 ) (4,218 ) 206 Segment EBITDA $ 1,251,399 $ 1,116,590 $ 1,004,980 (1) See Note 4, "Summary of Significant Accounting Policies ," for further information. (2) Reflects gains on foreign currency forwards used to fix the euro purchase price of Rhiag. See Note 2, "Business Combinations ," for further information. (3) Reflects the gains on bargain purchases related to our acquisitions of wholesale businesses in Europe and Andrew Page. See Note 2, "Business Combinations ," for further information. (4) See Note 6, "Restructuring and Acquisition Related Expenses," for further information.
Schedule Of Capital Expenditures By Reportable Segment	The following table presents capital expenditures by reportable segment (in thousands): Year Ended December 31, 2018 2017 2016 Capital Expenditures North America $ 129,391 $ 95,823 $ 91,618 Europe 99,885 71,494 77,689 Specialty 20,751 8,175 13,611 Discontinued operations — 3,598 24,156 Total capital expenditures $ 250,027 $ 179,090 $ 207,074
Schedule Of Assets By Reportable Segment	The following table presents assets by reportable segment (in thousands): December 31, 2018 2017 2016 Receivables, net North America $ 411,818 $ 379,666 $ 351,681 Europe (1) 649,174 555,372 443,281 Specialty 93,091 92,068 65,587 Total receivables, net (2) 1,154,083 1,027,106 860,549 Inventories North America 1,076,306 1,076,393 915,244 Europe (1) 1,410,264 964,068 718,729 Specialty 349,505 340,322 301,264 Total inventories 2,836,075 2,380,783 1,935,237 Property, Plant and Equipment, net North America 570,508 537,286 505,925 Europe (1) 562,600 293,539 247,910 Specialty 87,054 82,264 57,741 Total property, plant and equipment, net 1,220,162 913,089 811,576 Equity Method Investments North America 16,404 336 336 Europe (3) 162,765 208,068 183,131 Total equity method investments 179,169 208,404 183,467 Other unallocated assets 6,003,913 4,837,490 4,512,370 Total assets $ 11,393,402 $ 9,366,872 $ 8,303,199
Revenue from External Customers by Geographic Area	The following table sets forth our revenue by geographic area (in thousands): Year Ended December 31, 2018 2017 2016 Revenue United States $ 6,192,636 $ 5,662,016 $ 5,226,918 United Kingdom 1,665,317 1,548,212 1,390,775 Germany 974,514 1,744 1,227 Other countries 3,044,207 2,524,937 1,965,111 Total revenue $ 11,876,674 $ 9,736,909 $ 8,584,031
Schedule Of Tangible Long-Lived Assets By Geographic Area	The following table sets forth our tangible long-lived assets by geographic area (in thousands): December 31, 2018 2017 2016 Long-lived Assets United States $ 620,125 $ 583,236 $ 531,425 Germany 217,476 41 19 United Kingdom 165,145 178,021 159,689 Other countries 217,416 151,791 120,443 Total long-lived assets $ 1,220,162 $ 913,089 $ 811,576

Selected Quarterly Data (unau_2

Selected Quarterly Data (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2018
Selected Quarterly Data [Abstract]
Quarterly Financial Information [Text Block]	Selected Quarterly Data (unaudited) The following table presents unaudited selected quarterly financial data for the two years ended December 31, 2018 . The operating results for any quarter are not necessarily indicative of the results for any future period. Quarter Ended (1) (In thousands, except per share data) Dec. 31 (2) (3) Sep. 30 (3) Jun. 30 Mar. 31 2018 Revenue $ 3,002,781 $ 3,122,378 $ 3,030,751 $ 2,720,764 Gross margin 1,161,809 1,197,198 1,161,879 1,053,971 Operating income (2) 164,146 234,733 256,794 226,568 Income from continuing operations (3) 42,456 134,480 157,866 152,763 Net loss from discontinued operations (4) (4,397 ) — — — Net income 38,059 134,480 157,866 152,763 Net income (loss) attributable to noncontrolling interest 2,010 378 859 (197 ) Net income attributable to LKQ stockholders 36,049 134,102 157,007 152,960 Basic earnings per share from continuing operations (6) $ 0.13 $ 0.42 $ 0.51 $ 0.49 Diluted earnings per share from continuing operations (6) $ 0.13 $ 0.42 $ 0.50 $ 0.49 Quarter Ended (In thousands, except per share data) Dec. 31 Sep. 30 Jun. 30 Mar. 31 2017 Revenue $ 2,469,855 $ 2,465,800 $ 2,458,411 $ 2,342,843 Gross margin 947,645 956,876 965,009 930,093 Operating income (5) 165,634 199,099 244,573 235,692 Income from continuing operations 122,870 122,381 150,914 140,809 Net loss from discontinued operations (4) (2,215 ) — — (4,531 ) Net income 120,655 122,381 150,914 136,278 Net loss attributable to noncontrolling interest (3,516 ) — — — Net income attributable to LKQ stockholders 124,171 122,381 150,914 136,278 Basic earnings per share from continuing operations (6) $ 0.40 $ 0.40 $ 0.49 $ 0.46 Diluted earnings per share from continuing operations (6) $ 0.39 $ 0.39 $ 0.49 $ 0.45 (1) The 2018 amounts presented above include the results of operations of Stahlgruber, from its acquisition effective May 30, 2018. (2) Reflects a $33 million goodwill impairment charge on the Aviation reporting unit recorded in the fourth quarter of 2018. See "Intangible Assets" in Note 4, "Summary of Significant Accounting Policies ," for further information. (3) Reflects impairment charges of $48 million and $23 million recorded in the fourth and third quarters of 2018, respectively, related to the Mekonomen equity investment. See "Investments in Unconsolidated Subsidiaries" in Note 4, "Summary of Significant Accounting Policies ," for further information. (4) In the first quarter of 2017, LKQ completed the sale of the glass manufacturing business of its PGW subsidiary and recorded a loss on sale of $4 million and an immaterial loss from discontinued operations, net of tax. During the fourth quarter of 2017, we recorded an additional loss on sale of $2 million . During the fourth quarter of 2018, we recorded a final tax expense adjustment of $4 million to the loss on sale of the glass manufacturing business of PGW. See Note 3, "Discontinued Operations" for further information regarding the disposal of the glass manufacturing business. (5) Certain amounts in the fourth quarter of 2017 have been recast to reflect the 2018 adoption of ASU 2017-07, "Improving the Presentation of Net Periodic Pension Cost and Net Periodic Postretirement Benefit Cost." See "Other Recently Adopted Accounting Pronouncements" within Note 4, "Summary of Significant Accounting Policies " for further information. (6) The sum of the quarters may not equal the total of the respective year's earnings per share on either a basic or diluted basis due to changes in weighted average shares outstanding throughout the year.
Quarterly Financial Information [Table Text Block]	The following table presents unaudited selected quarterly financial data for the two years ended December 31, 2018 . The operating results for any quarter are not necessarily indicative of the results for any future period. Quarter Ended (1) (In thousands, except per share data) Dec. 31 (2) (3) Sep. 30 (3) Jun. 30 Mar. 31 2018 Revenue $ 3,002,781 $ 3,122,378 $ 3,030,751 $ 2,720,764 Gross margin 1,161,809 1,197,198 1,161,879 1,053,971 Operating income (2) 164,146 234,733 256,794 226,568 Income from continuing operations (3) 42,456 134,480 157,866 152,763 Net loss from discontinued operations (4) (4,397 ) — — — Net income 38,059 134,480 157,866 152,763 Net income (loss) attributable to noncontrolling interest 2,010 378 859 (197 ) Net income attributable to LKQ stockholders 36,049 134,102 157,007 152,960 Basic earnings per share from continuing operations (6) $ 0.13 $ 0.42 $ 0.51 $ 0.49 Diluted earnings per share from continuing operations (6) $ 0.13 $ 0.42 $ 0.50 $ 0.49 Quarter Ended (In thousands, except per share data) Dec. 31 Sep. 30 Jun. 30 Mar. 31 2017 Revenue $ 2,469,855 $ 2,465,800 $ 2,458,411 $ 2,342,843 Gross margin 947,645 956,876 965,009 930,093 Operating income (5) 165,634 199,099 244,573 235,692 Income from continuing operations 122,870 122,381 150,914 140,809 Net loss from discontinued operations (4) (2,215 ) — — (4,531 ) Net income 120,655 122,381 150,914 136,278 Net loss attributable to noncontrolling interest (3,516 ) — — — Net income attributable to LKQ stockholders 124,171 122,381 150,914 136,278 Basic earnings per share from continuing operations (6) $ 0.40 $ 0.40 $ 0.49 $ 0.46 Diluted earnings per share from continuing operations (6) $ 0.39 $ 0.39 $ 0.49 $ 0.45

Condensed Consolidating Finan_2

Condensed Consolidating Financial Information (Tables)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Consolidating Financial Information [Abstract]
Consolidated Condensed Statements of Income	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Income (In thousands) Year Ended December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 6,276,951 $ 5,766,958 $ (167,235 ) $ 11,876,674 Cost of goods sold — 3,783,376 3,685,676 (167,235 ) 7,301,817 Gross margin — 2,493,575 2,081,282 — 4,574,857 Selling, general and administrative expenses 27,394 1,713,118 1,612,219 — 3,352,731 Restructuring and acquisition related expenses — 3,140 29,288 — 32,428 Impairment of goodwill — 33,244 — — 33,244 Depreciation and amortization 137 99,665 174,411 — 274,213 Operating (loss) income (27,531 ) 644,408 265,364 — 882,241 Other expense (income): Interest expense 66,794 640 78,943 — 146,377 Intercompany interest (income) expense, net (65,072 ) 40,756 24,316 — — Loss on debt extinguishment 1,350 — — — 1,350 Gains on bargain purchases — — (2,418 ) — (2,418 ) Interest income and other (income) expense, net (1,082 ) (15,586 ) 10,169 — (6,499 ) Total other expense, net 1,990 25,810 111,010 — 138,810 (Loss) income before (benefit) provision for income taxes (29,521 ) 618,598 154,354 — 743,431 (Benefit) provision for income taxes (18,600 ) 163,937 46,058 — 191,395 Equity in earnings (losses) of unconsolidated subsidiaries — 173 (64,644 ) — (64,471 ) Equity in earnings of subsidiaries 495,436 16,598 — (512,034 ) — Income from continuing operations 484,515 471,432 43,652 (512,034 ) 487,565 Net loss from discontinued operations (4,397 ) (4,397 ) — 4,397 (4,397 ) Net income 480,118 467,035 43,652 (507,637 ) 483,168 Less: net income attributable to noncontrolling interest — — 3,050 — 3,050 Net income attributable to LKQ stockholders $ 480,118 $ 467,035 $ 40,602 $ (507,637 ) $ 480,118	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Income (In thousands) Year Ended December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 5,780,904 $ 4,116,161 $ (160,156 ) $ 9,736,909 Cost of goods sold — 3,458,304 2,639,138 (160,156 ) 5,937,286 Gross margin — 2,322,600 1,477,023 — 3,799,623 Selling, general and administrative expenses 29,884 1,557,883 1,127,640 — 2,715,407 Restructuring and acquisition related expenses — 7,352 12,320 — 19,672 Depreciation and amortization 118 96,717 122,711 — 219,546 Operating (loss) income (30,002 ) 660,648 214,352 — 844,998 Other expense (income): Interest expense 66,030 546 35,064 — 101,640 Intercompany interest (income) expense, net (17,873 ) (2,383 ) 20,256 — — Loss on debt extinguishment 456 — — — 456 Gains on bargain purchases — — (3,870 ) — (3,870 ) Interest income and other expense (income), net 242 (14,323 ) (5,774 ) — (19,855 ) Total other expense (income), net 48,855 (16,160 ) 45,676 — 78,371 (Loss) income from continuing operations before provision for income taxes (78,857 ) 676,808 168,676 — 766,627 Provision for income taxes 28,684 168,288 38,588 — 235,560 Equity in earnings of unconsolidated subsidiaries — — 5,907 — 5,907 Equity in earnings of subsidiaries 648,031 21,836 — (669,867 ) — Income from continuing operations 540,490 530,356 135,995 (669,867 ) 536,974 Net (loss) income from discontinued operations (6,746 ) (6,746 ) 2,050 4,696 (6,746 ) Net income 533,744 523,610 138,045 (665,171 ) 530,228 Less: net loss attributable to noncontrolling interest — — (3,516 ) — (3,516 ) Net income attributable to LKQ stockholders $ 533,744 $ 523,610 $ 141,561 $ (665,171 ) $ 533,744	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Income (In thousands) Year Ended December 31, 2016 Parent Guarantors Non-Guarantors Eliminations Consolidated Revenue $ — $ 5,467,430 $ 3,301,503 $ (184,902 ) $ 8,584,031 Cost of goods sold — 3,313,503 2,103,727 (184,902 ) 5,232,328 Gross margin — 2,153,927 1,197,776 — 3,351,703 Selling, general and administrative expenses 34,163 1,450,588 874,359 — 2,359,110 Restructuring and acquisition related expenses — 21,162 16,600 — 37,762 Depreciation and amortization 132 94,165 97,136 — 191,433 Operating (loss) income (34,295 ) 588,012 209,681 — 763,398 Other expense (income): Interest expense 59,415 547 28,301 — 88,263 Intercompany interest (income) expense, net (27,470 ) 17,124 10,346 — — Loss on debt extinguishment 2,894 — 23,756 — 26,650 Gains on foreign exchange contracts - acquisition related (18,342 ) — — — (18,342 ) Gains on bargain purchase — — (8,207 ) — (8,207 ) Interest income and other expense (income), net 470 (3,773 ) 1,056 — (2,247 ) Total other expense, net 16,967 13,898 55,252 — 86,117 (Loss) income from continuing operations before (benefit) provision for income taxes (51,262 ) 574,114 154,429 — 677,281 (Benefit) provision for income taxes (20,498 ) 213,794 27,270 — 220,566 Equity in (loss) earnings of unconsolidated subsidiaries (795 ) — 203 — (592 ) Equity in earnings of subsidiaries 487,682 22,314 — (509,996 ) — Income from continuing operations 456,123 382,634 127,362 (509,996 ) 456,123 Net income from discontinued operations 7,852 7,852 3,285 (11,137 ) 7,852 Net income $ 463,975 $ 390,486 $ 130,647 $ (521,133 ) $ 463,975
Consolidated Condensed Statements of Comprehensive Income (Loss)	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Comprehensive Income (In thousands) Year Ended December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 480,118 $ 467,035 $ 43,652 $ (507,637 ) $ 483,168 Less: net income attributable to noncontrolling interest — — 3,050 — 3,050 Net income attributable to LKQ stockholders 480,118 467,035 40,602 (507,637 ) 480,118 Other comprehensive (loss) income: Foreign currency translation, net of tax (108,523 ) (8,628 ) (75,462 ) 84,090 (108,523 ) Net change in unrealized gains/losses on cash flow hedges, net of tax 350 — — — 350 Net change in unrealized gains/losses on pension plans, net of tax 697 1,266 (569 ) (697 ) 697 Net change in other comprehensive loss from unconsolidated subsidiaries (2,343 ) — (2,343 ) 2,343 (2,343 ) Other comprehensive loss (109,819 ) (7,362 ) (78,374 ) 85,736 (109,819 ) Comprehensive income (loss) 370,299 459,673 (34,722 ) (421,901 ) 373,349 Less: comprehensive income attributable to noncontrolling interest — — 3,050 — 3,050 Comprehensive income (loss) attributable to LKQ stockholders $ 370,299 $ 459,673 $ (37,772 ) $ (421,901 ) $ 370,299	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Comprehensive Income (In thousands) Year Ended December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 533,744 $ 523,610 $ 138,045 $ (665,171 ) $ 530,228 Less: net loss attributable to noncontrolling interest — — (3,516 ) — (3,516 ) Net income attributable to LKQ stockholders 533,744 523,610 141,561 (665,171 ) 533,744 Other comprehensive income (loss): Foreign currency translation, net of tax 200,596 16,743 206,049 (222,792 ) 200,596 Net change in unrealized gains/losses on cash flow hedges, net of tax 3,447 (133 ) — 133 3,447 Net change in unrealized gains/losses on pension plans, net of tax (6,035 ) (3,254 ) (2,781 ) 6,035 (6,035 ) Net change in other comprehensive loss from unconsolidated subsidiaries (1,309 ) — (1,309 ) 1,309 (1,309 ) Other comprehensive income 196,699 13,356 201,959 (215,315 ) 196,699 Comprehensive income 730,443 536,966 340,004 (880,486 ) 726,927 Less: comprehensive loss attributable to noncontrolling interest — — (3,516 ) — (3,516 ) Comprehensive income attributable to LKQ stockholders $ 730,443 $ 536,966 $ 343,520 $ (880,486 ) $ 730,443	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Comprehensive Income (In thousands) Year Ended December 31, 2016 Parent Guarantors Non-Guarantors Eliminations Consolidated Net income $ 463,975 $ 390,486 $ 130,647 $ (521,133 ) $ 463,975 Other comprehensive (loss) income: Foreign currency translation, net of tax (175,639 ) (48,914 ) (177,911 ) 226,825 (175,639 ) Net change in unrecognized gains/losses on cash flow hedges, net of tax 9,023 133 389 (522 ) 9,023 Net change in unrealized gains/losses on pension plans, net of tax 4,911 3,962 1,061 (5,023 ) 4,911 Total other comprehensive loss (161,705 ) (44,819 ) (176,461 ) 221,280 (161,705 ) Total comprehensive income (loss) $ 302,270 $ 345,667 $ (45,814 ) $ (299,853 ) $ 302,270
Consolidated Condensed Balance Sheets	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Balance Sheets (In thousands) December 31, 2018 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 25,633 $ 29,285 $ 276,843 $ — $ 331,761 Receivables, net 310 316,726 837,047 — 1,154,083 Intercompany receivables, net 6,978 — 12,880 (19,858 ) — Inventories — 1,343,612 1,492,463 — 2,836,075 Prepaid expenses and other current assets 18,611 99,356 81,063 — 199,030 Total current assets 51,532 1,788,979 2,700,296 (19,858 ) 4,520,949 Property, plant and equipment, net 1,547 600,054 618,561 — 1,220,162 Intangible assets: Goodwill — 1,973,364 2,408,094 — 4,381,458 Other intangibles, net 260 272,451 656,041 — 928,752 Investment in subsidiaries 5,224,006 111,826 — (5,335,832 ) — Intercompany notes receivable 1,220,582 10,515 — (1,231,097 ) — Equity method investments — 16,404 162,765 — 179,169 Other assets 70,283 40,548 52,081 — 162,912 Total assets $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 2,454 $ 343,116 $ 596,828 $ — $ 942,398 Intercompany payables, net — 12,880 6,978 (19,858 ) — Accrued expenses: Accrued payroll-related liabilities 6,652 70,267 95,086 — 172,005 Other accrued expenses 5,454 105,672 177,299 — 288,425 Refund liability — 50,899 53,686 — 104,585 Other current liabilities 283 17,860 42,966 — 61,109 Current portion of long-term obligations 8,459 2,932 110,435 — 121,826 Total current liabilities 23,302 603,626 1,083,278 (19,858 ) 1,690,348 Long-term obligations, excluding current portion 1,628,677 13,532 2,546,465 — 4,188,674 Intercompany notes payable — 597,283 633,814 (1,231,097 ) — Deferred income taxes 8,045 135,355 168,034 — 311,434 Other noncurrent liabilities 125,888 99,147 139,159 — 364,194 Stockholders' equity: Total Company stockholders’ equity 4,782,298 3,365,198 1,970,634 (5,335,832 ) 4,782,298 Noncontrolling interest — — 56,454 — 56,454 Total stockholders’ equity 4,782,298 3,365,198 2,027,088 (5,335,832 ) 4,838,752 Total liabilities and stockholders' equity $ 6,568,210 $ 4,814,141 $ 6,597,838 $ (6,586,787 ) $ 11,393,402	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Balance Sheets (In thousands) December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated Assets Current assets: Cash and cash equivalents $ 34,360 $ 35,131 $ 210,275 $ — $ 279,766 Receivables, net — 290,958 736,148 — 1,027,106 Intercompany receivables, net 2,669 3,010 230 (5,909 ) — Inventories — 1,334,766 1,046,017 — 2,380,783 Prepaid expenses and other current assets 34,136 44,849 55,494 — 134,479 Total current assets 71,165 1,708,714 2,048,164 (5,909 ) 3,822,134 Property, plant and equipment, net 910 563,262 348,917 — 913,089 Intangible assets: Goodwill — 2,010,209 1,526,302 — 3,536,511 Other intangibles, net — 291,036 452,733 — 743,769 Investment in subsidiaries 5,952,687 102,931 — (6,055,618 ) — Intercompany notes receivable 1,156,550 782,638 — (1,939,188 ) — Equity method investments — 336 208,068 — 208,404 Other assets 70,590 33,597 38,778 — 142,965 Total assets $ 7,251,902 $ 5,492,723 $ 4,622,962 $ (8,000,715 ) $ 9,366,872 Liabilities and Stockholders’ Equity Current liabilities: Accounts payable $ 5,742 $ 340,951 $ 441,920 $ — $ 788,613 Intercompany payables, net — 230 5,679 (5,909 ) — Accrued expenses: Accrued payroll-related liabilities 9,448 65,811 68,165 — 143,424 Other accrued expenses 5,219 95,900 117,481 — 218,600 Other current liabilities 282 27,066 18,379 — 45,727 Current portion of long-term obligations 16,468 1,912 107,980 — 126,360 Total current liabilities 37,159 531,870 759,604 (5,909 ) 1,322,724 Long-term obligations, excluding current portion 2,095,826 7,372 1,174,422 — 3,277,620 Intercompany notes payable 750,000 677,708 511,480 (1,939,188 ) — Deferred income taxes 12,402 116,021 123,936 — 252,359 Other noncurrent liabilities 158,346 101,189 47,981 — 307,516 Stockholders' equity: Total Company stockholders’ equity 4,198,169 4,058,563 1,997,055 (6,055,618 ) 4,198,169 Noncontrolling interest — — 8,484 — 8,484 Total stockholders’ equity 4,198,169 4,058,563 2,005,539 (6,055,618 ) 4,206,653 Total liabilities and stockholders' equity $ 7,251,902 $ 5,492,723 $ 4,622,962 $ (8,000,715 ) $ 9,366,872
Consolidated Condensed Statements of Cash Flows	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Cash Flows (In thousands) Year Ended December 31, 2018 Parent Guarantors Non-Guarantors (1) Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 481,138 $ 277,595 $ 111,213 $ (159,207 ) $ 710,739 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (848 ) (136,033 ) (113,146 ) — (250,027 ) Proceeds from disposals of property, plant and equipment — 22,393 5,266 — 27,659 Investment and intercompany note activity with subsidiaries (97,261 ) — — 97,261 — Return of investment in subsidiaries 143,524 — — (143,524 ) — Acquisitions, net of cash and restricted cash acquired — (8,217 ) (1,206,778 ) — (1,214,995 ) Investments in unconsolidated subsidiaries — (12,216 ) (48,084 ) — (60,300 ) Receipts of deferred purchase price on receivables under factoring arrangements — 317,091 36,991 (317,091 ) 36,991 Other investing activities, net 887 180 666 — 1,733 Net cash provided by (used in) investing activities 46,302 183,198 (1,325,085 ) (363,354 ) (1,458,939 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 5,303 — — — 5,303 Taxes paid related to net share settlements of stock-based compensation awards (5,567 ) — — — (5,567 ) Debt issuance costs (5,434 ) — (15,694 ) — (21,128 ) Proceeds from issuance of Euro Notes (2026/28) — — 1,232,100 — 1,232,100 Purchase of treasury stock (60,000 ) — — — (60,000 ) Borrowings under revolving credit facilities 765,632 — 901,693 — 1,667,325 Repayments under revolving credit facilities (884,863 ) — (644,107 ) — (1,528,970 ) Repayments under term loans (354,800 ) — — — (354,800 ) Borrowings under receivables securitization facility — — 10,120 — 10,120 Repayments under receivables securitization facility — — (120 ) — (120 ) Payment of assumed debt and notes issued from acquisitions — — (54,888 ) — (54,888 ) Repayments of other debt, net (385 ) (3,636 ) (7,709 ) — (11,730 ) Other financing activities, net 3,947 — 1,403 — 5,350 Investment and intercompany note activity with parent — (68,435 ) 165,696 (97,261 ) — Dividends — (392,883 ) (226,939 ) 619,822 — Net cash (used in) provided by financing activities (536,167 ) (464,954 ) 1,361,555 522,561 882,995 Effect of exchange rate changes on cash, cash equivalents and restricted cash — (1,685 ) (75,626 ) — (77,311 ) Net (decrease) increase in cash, cash equivalents and restricted cash (8,727 ) (5,846 ) 72,057 — 57,484 Cash, cash equivalents and restricted cash, beginning of period 34,360 35,131 210,275 — 279,766 Cash, cash equivalents and restricted cash, end of period $ 25,633 $ 29,285 $ 282,332 $ — $ 337,250	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Cash Flows (In thousands) Year Ended December 31, 2017 Parent Guarantors Non-Guarantors Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 243,011 $ 186,459 $ 95,617 $ (6,187 ) $ 518,900 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (648 ) (87,102 ) (91,340 ) — (179,090 ) Proceeds from disposals of property, plant and equipment — 6,490 2,217 — 8,707 Investment and intercompany note activity with subsidiaries 57,735 — — (57,735 ) — Acquisitions, net of cash acquired — (335,582 ) (177,506 ) — (513,088 ) Proceeds from disposals of business/investment — 305,740 (4,443 ) — 301,297 Investments in unconsolidated subsidiaries — (2,750 ) (4,914 ) — (7,664 ) Receipts of deferred purchase price on receivables under factoring arrangements (1) — 294,925 — (294,925 ) — Other investing activities, net — — 5,243 — 5,243 Net cash provided by (used in) investing activities 57,087 181,721 (270,743 ) (352,660 ) (384,595 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 7,470 — — — 7,470 Taxes paid related to net share settlements of stock-based compensation awards (5,525 ) — — — (5,525 ) Debt issuance costs (4,267 ) — — — (4,267 ) Borrowings under revolving credit facilities 558,000 — 281,171 — 839,171 Repayments under revolving credit facilities (824,862 ) — (121,615 ) — (946,477 ) Repayments under term loans (27,884 ) — — — (27,884 ) Borrowings under receivables securitization facility — — 11,245 — 11,245 Repayments under receivables securitization facility — — (11,245 ) — (11,245 ) (Repayments) borrowings of other debt, net (1,700 ) (1,318 ) 22,724 — 19,706 Other financing activities, net — (1,336 ) 6,575 — 5,239 Investment and intercompany note activity with parent — (65,498 ) 7,763 57,735 — Dividends — (301,112 ) — 301,112 — Net cash (used in) provided by financing activities (298,768 ) (369,264 ) 196,618 358,847 (112,567 ) Effect of exchange rate changes on cash and cash equivalents — 706 22,806 — 23,512 Net increase (decrease) in cash and cash equivalents 1,330 (378 ) 44,298 — 45,250 Cash and cash equivalents of continuing operations, beginning of period 33,030 35,360 159,010 — 227,400 Add: Cash and cash equivalents of discontinued operations, beginning of period — 149 6,967 — 7,116 Cash and cash equivalents of continuing and discontinued operations, beginning of period 33,030 35,509 165,977 — 234,516 Cash and cash equivalents, end of period $ 34,360 $ 35,131 $ 210,275 $ — $ 279,766	LKQ CORPORATION AND SUBSIDIARIES Condensed Consolidating Statements of Cash Flows (In thousands) Year Ended December 31, 2016 Parent Guarantors Non-Guarantors Eliminations Consolidated CASH FLOWS FROM OPERATING ACTIVITIES: Net cash provided by operating activities $ 308,299 $ 149,785 $ 99,894 $ 77,036 $ 635,014 CASH FLOWS FROM INVESTING ACTIVITIES: Purchases of property, plant and equipment (36 ) (120,761 ) (86,277 ) — (207,074 ) Proceeds from disposals of property, plant and equipment 3 1,953 1,554 — 3,510 Investment and intercompany note activity with subsidiaries (1,720,732 ) — — 1,720,732 — Acquisitions, net of cash acquired — (685,278 ) (664,061 ) — (1,349,339 ) Proceeds from disposal of business/investment — — 10,304 — 10,304 Investments in unconsolidated subsidiaries — (4,400 ) (181,271 ) — (185,671 ) Receipts of deferred purchase price on receivables under factoring arrangements (1) — 389,533 — (389,533 ) — Proceeds from foreign exchange contracts 18,342 — — — 18,342 Net cash used in investing activities (1,702,423 ) (418,953 ) (919,751 ) 1,331,199 (1,709,928 ) CASH FLOWS FROM FINANCING ACTIVITIES: Proceeds from exercise of stock options 7,963 — — — 7,963 Taxes paid related to net share settlements of stock-based compensation awards (4,438 ) — — — (4,438 ) Debt issuance costs (7,104 ) — (9,450 ) — (16,554 ) Proceeds from issuance of Euro Notes (2024) — — 563,450 — 563,450 Borrowings under revolving credit facilities 1,744,408 — 892,188 — 2,636,596 Repayments under revolving credit facilities (654,000 ) — (1,094,664 ) — (1,748,664 ) Borrowings under term loans 332,954 — 249,161 — 582,115 Repayments under term loans (10,898 ) — (244,894 ) — (255,792 ) Borrowings under receivables securitization facility — — 106,400 — 106,400 Repayments under receivables securitization facility — — (69,400 ) — (69,400 ) Borrowings (repayments) of other debt, net 653 (2,935 ) (28,874 ) — (31,156 ) Payments of Rhiag debt and related payments — — (543,347 ) — (543,347 ) Other financing activities, net — (1,436 ) — — (1,436 ) Investment and intercompany note activity with parent — 608,270 1,112,462 (1,720,732 ) — Dividends — (312,497 ) — 312,497 — Net cash provided by financing activities 1,409,538 291,402 933,032 (1,408,235 ) 1,225,737 Effect of exchange rate changes on cash and cash equivalents — (157 ) (3,547 ) — (3,704 ) Net increase in cash and cash equivalents 15,414 22,077 109,628 — 147,119 Cash and cash equivalents of continuing operations, beginning of period 17,616 13,432 56,349 — 87,397 Cash and cash equivalents of continuing and discontinued operations, end of period 33,030 35,509 165,977 — 234,516 Less: Cash and cash equivalents of discontinued operations, end of period — (149 ) (6,967 ) — (7,116 ) Cash and cash equivalents, end of period $ 33,030 $ 35,360 $ 159,010 $ — $ 227,400

Business Business - Additional

Business Business - Additional Information (Details)	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Facilities	1,700

Business Combinations - Additio

Business Combinations - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions	1 Months Ended		3 Months Ended				6 Months Ended					7 Months Ended	12 Months Ended						15 Months Ended
	Nov. 30, 2017	Jul. 30, 2017	Jun. 30, 2018USD ($)	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)	Mar. 31, 2016EUR (€)	Dec. 31, 2018USD ($)	Jun. 30, 2018USD ($)shares	Jun. 30, 2018EUR (€)shares	Jun. 30, 2017USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2018USD ($)	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016GBP (£)	Dec. 31, 2016USD ($)	Dec. 31, 2017USD ($)	Jun. 30, 2018EUR (€)	Apr. 09, 2018USD ($)	Mar. 31, 2016EUR (€)	Mar. 24, 2016USD ($)	Mar. 24, 2016EUR (€)
Business Acquisition
Gains on bargain purchases													$ 2,418		$ 3,870			$ 8,207
Cash used in acquisitions, net of cash acquired													1,214,995		513,088			1,349,339
Settlement of pre-existing balances							$ 0					$ 0	0		242				$ 242
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt																							$ 520,000	€ 465
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities							11,347					11,347	11,347		20,187				20,187
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing							2,461					2,461	2,461		5,074				5,074
Revenue													11,876,674		9,736,909			8,584,031
Operating income													882,241		$ 844,998			763,398
Number of acquisitions															26
Gains on foreign exchange contracts - acquisition related													0		$ 0			$ 18,342
Contingent consideration liabilities							(3,107)					(3,107)	(3,107)		$ (6,234)				(6,234)
Warn Industries [Member]
Business Acquisition
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles													5,000
Business Acquisition, Effective Date of Acquisition	Nov. 30, 2017
2017 Acquisitions Excluding Warn [Member]
Business Acquisition
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing, Post Purchase Adjustment													(4,000)
Stahlgruber [Member]
Business Acquisition
Business Acquisition, Effective Date of Acquisition			May 30, 2018
Total acquisition date fair value of the consideration for acquisitions								$ 1,400,000	€ (1,200)
Gains on bargain purchases													0
Cash used in acquisitions, net of cash acquired								1,100,000	€ 1,000				1,127,446
Settlement of pre-existing balances							0					0	0
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned			$ 251,000					$ 251,000						$ 251,000						€ 215
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities							0					0	0
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing							6,084					6,084	6,084
Debt Instrument, Face Amount																					$ 1,200,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | shares								8,055,569	8,055,569
Business Acquisition, Goodwill, Expected Tax Deductible Amount							300,000					300,000	300,000
Revenue												1,100,000
Operating income												52,000
Goodwill, Acquired During Period													908,000
Contingent consideration liabilities							0					0	0
Goodwill, Purchase Accounting Adjustments							22,000
Other Than Stahlgruber [Member]
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions													(99,000)
Cash used in acquisitions, net of cash acquired													85,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount							4,000					4,000	4,000
Revenue													46,000
Operating income													3,000
Goodwill, Acquired During Period													68,000
All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities							11,000					11,000	11,000
Goodwill, Purchase Accounting Adjustments													$ 14,000
Wholesale - NA [Member]
Business Acquisition
Number of acquisitions													4		6		5	5
Wholesale Europe [Member]
Business Acquisition
Number of acquisitions													9		16		7	7
2017 acquisitions and adjustments to 2016 acquisitions [Member]
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions															$ (542,000)
Cash used in acquisitions, net of cash acquired															510,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities															20,000				20,000
All 2017 Acquisitions [Member]
Business Acquisition
Goodwill, Acquired During Period															307,000
Rhiag
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions					$ (602,000)	€ (534)
Cash used in acquisitions, net of cash acquired					601,000	€ 534
Settlement of pre-existing balances					1,000																	€ 1
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt					551,000																	€ 489
Goodwill, Acquired During Period				$ 5,000												$ 591,000		$ 585,000
Derivative, Notional Amount					588,000
Gains on foreign exchange contracts - acquisition related					$ 18,000
PGW
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions											$ (662,000)
Goodwill, Acquired During Period										$ 3,000				$ 208,000				205,000
Andrew Page
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions																	£ (16)	(20,000)
Gains on bargain purchases															$ 2,000			$ 8,000	10,000
Required divestiture of branches due to Governmental review of the acquisition																		10.00%
All 2016 Acquisitions Excluding Rhiag PGW and Andrew Page [Member]
Business Acquisition
Total acquisition date fair value of the consideration for acquisitions																		$ (76,000)
Cash used in acquisitions, net of cash acquired																		68,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities																		4,000
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing																		4,000
Goodwill, Acquired During Period																		52,000
Specialty
Business Acquisition
Number of acquisitions															4
Aftermarket Parts Distribution Businesses In Europe [Member]
Business Acquisition
Business Acquisition, Effective Date of Acquisition		Jul. 31, 2017
Number of acquisitions															4
Payment To Former Owners [Member] | All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Contingent consideration liabilities							(3,000)					(3,000)	$ (3,000)
Payment To Former Owners [Member] | 2017 acquisitions and adjustments to 2016 acquisitions [Member]
Business Acquisition
Contingent consideration liabilities															$ (6,000)				(6,000)
Payment To Former Owners [Member] | Maximum | All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Contingent consideration liabilities							$ (5,000)					$ (5,000)	(5,000)
Payment To Former Owners [Member] | Maximum | 2017 acquisitions and adjustments to 2016 acquisitions [Member]
Business Acquisition
Contingent consideration liabilities															(19,000)				(19,000)
Non-interest Bearing [Member] | 2017 acquisitions and adjustments to 2016 acquisitions [Member]
Business Acquisition
Contingent consideration liabilities															(5,000)				$ (5,000)
Specialty
Business Acquisition
Revenue													$ 1,477,680		$ 1,305,516			$ 1,223,723

Purchase Price Allocations for

Purchase Price Allocations for Acquisitions (Details) $ in Thousands, € in Millions	3 Months Ended		6 Months Ended		12 Months Ended			15 Months Ended
	Mar. 31, 2016USD ($)	Mar. 31, 2016EUR (€)	Jun. 30, 2018USD ($)	Jun. 30, 2018EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2016EUR (€)	Dec. 31, 2015USD ($)
Business Acquisition
Receivables					$ 163,997	$ 73,782		$ 73,782
Receivable reserves					(3,736)	(7,032)		(7,032)
Inventories (3)					394,259	150,342		150,342
Prepaid expenses and other current assets					12,821	(295)		(295)
Property, plant and equipment					277,003	41,039		41,039
Goodwill					4,381,458	3,536,511	$ 3,054,769	3,536,511		$ 2,319,246
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net						314,817		314,817
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					320,414	181,216		181,216
Other assets					16,662	3,257		3,257
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities					(83,415)	(65,087)		(65,087)
Current liabilities assumed					(366,904)	(111,484)		(111,484)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					(84,800)	(33,586)		(33,586)
Other noncurrent liabilities assumed					(91,130)	(1,917)		(1,917)
Consolidation, Less Than Wholly Owned Subsidiary, Non Controlling Interest Acquired, Value					(44,110)	0
Contingent consideration liabilities					(3,107)	(6,234)		(6,234)
Other purchase price obligations					(2,461)	(5,074)		(5,074)
Stock Issued During Period, Value, Acquisitions					(251,334)	0	0
Notes issued					(11,347)	(20,187)		(20,187)
Settlement of pre-existing balances					0	242		242
Gains on bargain purchases					(2,418)	(3,870)	(8,207)
Settlement of other purchase price obligations (non-interest bearing)					1,711	3,159
Cash used in acquisitions, net of cash acquired					1,214,995	513,088	1,349,339
Defined Benefit Plan, Benefit Obligation, Business Combination					79,211	938
Warn Industries [Member]
Business Acquisition
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles					5,000
Inventory step-up adjustment - acquisition related						4,000
2017 Acquisitions Excluding Warn [Member]
Business Acquisition
Business Acquisition Cost Of Acquired Entity Other Purchase Price Obligations Non Interest Bearing, Post Purchase Adjustment					(4,000)
2017 acquisitions and adjustments to 2016 acquisitions [Member]
Business Acquisition
Notes issued						(20,000)		(20,000)
Cash used in acquisitions, net of cash acquired						510,000
Stahlgruber [Member]
Business Acquisition
Receivables					144,826
Receivable reserves					(2,818)
Inventories (3)					380,238
Prepaid expenses and other current assets					10,970
Property, plant and equipment					271,292
Goodwill					908,253
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					285,255
Other assets					16,625
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities					(78,130)
Current liabilities assumed					(346,788)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					(79,925)
Other noncurrent liabilities assumed					(80,824)
Consolidation, Less Than Wholly Owned Subsidiary, Non Controlling Interest Acquired, Value					(44,110)
Contingent consideration liabilities					0
Other purchase price obligations					(6,084)
Stock Issued During Period, Value, Acquisitions					(251,334)
Notes issued					0
Settlement of pre-existing balances					0
Gains on bargain purchases					0
Settlement of other purchase price obligations (non-interest bearing)					0
Cash used in acquisitions, net of cash acquired			$ 1,100,000	€ 1,000	1,127,446
Defined Benefit Plan, Benefit Obligation, Business Combination					79,000
All 2018 Acquisitions and adjustments to 2017 acquisitions excluding Stahlgruber
Business Acquisition
Receivables					19,171
Receivable reserves					(918)
Inventories (3)					14,021
Prepaid expenses and other current assets					1,851
Property, plant and equipment					5,711
Goodwill					64,637
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill					35,159
Other assets					37
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities					(5,285)
Current liabilities assumed					(20,116)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					(4,875)
Other noncurrent liabilities assumed					(10,306)
Consolidation, Less Than Wholly Owned Subsidiary, Non Controlling Interest Acquired, Value					0
Contingent consideration liabilities					(3,107)
Other purchase price obligations					3,623
Stock Issued During Period, Value, Acquisitions					0
Notes issued					(11,347)
Settlement of pre-existing balances					0
Gains on bargain purchases					(2,418)
Settlement of other purchase price obligations (non-interest bearing)					1,711
Cash used in acquisitions, net of cash acquired					87,549
All 2018 and 2017 Acquisitions [Member]
Business Acquisition
Goodwill					$ 972,890
Rhiag
Business Acquisition
Settlement of pre-existing balances	$ 1,000								€ 1
Cash used in acquisitions, net of cash acquired	$ 601,000	€ 534
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						(6,000)
PGW
Business Acquisition
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment						(3,000)
Andrew Page
Business Acquisition
Gains on bargain purchases						(2,000)	$ (8,000)	$ (10,000)
Gain on bargain purchase						$ (2,000)

Pro Forma Effect of Businesses

Pro Forma Effect of Businesses Acquired (Details) - USD ($) $ / shares in Units, $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition
Pro Forma costs excluded				$ 5,000
Revenue, as reported		$ 11,876,674	$ 9,736,909	8,584,031
Income from continuing operations		$ 487,565	$ 536,974	$ 456,123
Basic earnings per share from continuing operations		$ 1.55	$ 1.74	$ 1.49
Diluted earnings per share from continuing operations		$ 1.54	$ 1.73	$ 1.47
All 2018 Acquisitions [Member]
Business Acquisition
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest		$ 2,799
Acquisition Related Costs, Net of Tax		$ 14,414
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect		$ 0.05
Business Acquisition Pro Forma Income Loss From Share Issuance attributable to noncontrolling interest, Per Basic Share Effect		0.01
All 2017 Acquisitions [Member]
Business Acquisition
Acquisition Related Costs, Net of Tax			$ 8,787
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect			$ 0.03
All 2016 Acquisitions [Member]
Business Acquisition
Acquisition Related Costs, Net of Tax				$ 11,602
Business Acquisition Pro Forma Income Loss From Acquisition Related Costs, Net of Tax, Per Basic Share Effect				$ 0.04
Stahlgruber [Member]
Business Acquisition
Revenue, as reported	$ 1,100,000
Business Acquisition Pro Forma Income Loss From Share Issuance, Per Basic Share Effect		$ (0.02)	$ (0.04)	$ 0
All 2017 acquisitions [Member]
Business Acquisition
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest			$ 1,095
Business Acquisition Pro Forma Income Loss From Share Issuance attributable to noncontrolling interest, Per Basic Share Effect			$ 0
All 2017 and 2016 acquisitions [Domain]
Business Acquisition
Business Acquisition Pro Forma Net Income attributable to noncontrolling interest				$ 0
Business Acquisition Pro Forma Income Loss From Share Issuance attributable to noncontrolling interest, Per Basic Share Effect				$ 0
Pro Forma [Member]
Business Acquisition
Revenue, as reported		$ 12,764,380	$ 11,942,523	$ 9,754,548
Income from continuing operations		520,795	567,224	494,538
Income (Loss) from Continuing Operations, Net of Tax, Excluding Portion Attributable to Noncontrolling Interest		$ 517,996	$ 566,129	$ 494,538
Basic earnings per share from continuing operations		$ 1.64	$ 1.79	$ 1.61
Income (Loss) from Continuing Operations attributable to LKQ stockholders, Per Basic Share		1.63	1.79	1.61
Diluted earnings per share from continuing operations		1.63	1.78	1.60
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations attributable to LKQ stockholders, Net of Tax, Per Share, Diluted		$ 1.62	$ 1.78	$ 1.60
Pro Forma [Member] | Stahlgruber [Member]
Business Acquisition
Revenue, as reported		$ 815,405	$ 1,756,893	$ 0
Income from continuing operations		$ 17,309	$ 4,796	$ 0
Basic earnings per share from continuing operations		$ 0.06	$ 0.02	$ 0
Diluted earnings per share from continuing operations		$ 0.05	$ 0.02	$ 0
Pro Forma [Member] | All 2018 Acquisitions excluding Stahlgruber [Member]
Business Acquisition
Revenue, as reported		$ 72,301
Income from continuing operations		$ 1,507
Basic earnings per share from continuing operations		$ 0
Diluted earnings per share from continuing operations		$ 0
Pro Forma [Member] | All 2018 and 2017 acquisitions excluding Stahlgruber [Member]
Business Acquisition
Revenue, as reported			$ 448,721
Income from continuing operations			$ 16,667
Basic earnings per share from continuing operations			$ 0.05
Diluted earnings per share from continuing operations			$ 0.05
Pro Forma [Member] | All 2017 and 2016 acquisitions excluding Rhiag and PGW [Domain]
Business Acquisition
Revenue, as reported				$ 854,601
Income from continuing operations				$ 19,323
Basic earnings per share from continuing operations				$ 0.06
Diluted earnings per share from continuing operations				$ 0.06
Pro Forma [Member] | Rhiag
Business Acquisition
Revenue, as reported		$ 0	$ 0	$ 213,376
Income from continuing operations		$ 0	$ 0	$ (84)
Basic earnings per share from continuing operations		$ 0	$ 0	$ 0
Diluted earnings per share from continuing operations		$ 0	$ 0	$ 0
Pro Forma [Member] | PGW [Member]
Business Acquisition
Revenue, as reported		$ 0	$ 0	$ 102,540
Income from continuing operations		$ 0	$ 0	$ 7,574
Basic earnings per share from continuing operations		$ 0	$ 0	$ 0.02
Diluted earnings per share from continuing operations		$ 0	$ 0	$ 0.02

Discontinued Operations Results

Discontinued Operations Results Of Discontinued Operations (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended		8 Months Ended	12 Months Ended
	Mar. 01, 2017	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Depreciation and Amortization	$ 0			$ 7,752
Capital Expenditures	(3,598)			(24,156)	$ 250,027	$ 179,090	$ 207,074
Purchases under supply agreement					24,000	42,000
Cash Provided by (Used in) Operating Activities, Discontinued Operations				64,000
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Impairment on net assets of discontinued operations	0			26,677	0	0	26,677
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax		$ (2,000)	$ (4,000)
Net (loss) income from discontinued operations					(4,397)	(6,746)	7,852
Deferred income taxes	0			(4,516)	(2,180)	(46,537)	(16,162)
DCO Footnote 2 [Abstract]
Loss on sale of business		$ (2,000)			0	10,796	0
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation							7,000
Fixed asset impairment due to pending sale							21,000
Valuation Allowance due to Pending Sale				6,000			6,000
Proceeds from Divestiture of Businesses, Net of Cash Divested						301,297	10,304
Cash Provided by (Used in) Investing Activities, Discontinued Operations				29,000
Cash Provided by (Used in) Financing Activities, Discontinued Operations				1,000
Intercompany Sales between Continuing and Discontinued Operations				29,000
Payments to Acquire Equity Method Investments	0			(4,400)	60,300	7,664	185,671
PGW
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Provided by (Used in) Operating Activities, Discontinued Operations	(4,000)
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Disposal Group, Including Discontinued Operation, Revenue					0	111,130	498,233
Disposal Group, Including Discontinued Operation, Costs of Goods Sold					0	100,084	424,161
Disposal Group, Including Discontinued Operation, General and Administrative Expense					0	8,369	22,330
Impairment on net assets of discontinued operations					0	0	26,677
Disposal Group, Including Discontinued Operation, Operating Income (Loss)					0	2,677	25,065
Disposal Group, Including Discontinued Operation, Other Expense					0	1,204	(9,136)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax					0	3,881	15,929
Discontinued Operation, Tax Effect of Discontinued Operation					0	3,598	8,252
disposal group, including discontinued operation, equity in earnings					0	(534)	175
IncomeLossFromDiscontinuedOperationsExcludingLossOnSaleNetOfTaxAttributableToReportingEntity					0	(251)	7,852
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax					(4,397)	(6,495)	0
Net (loss) income from discontinued operations					$ (4,397)	$ (6,746)	7,852
DCO Footnote 1 [Abstract]
Interest Allocated to Discontinued Operations	2,000			$ 6,000
DCO Footnote 2 [Abstract]
Loss on sale of business			8,580				$ 27,000
Discontinued Operation, Tax Effect of Gain (Loss) from Disposal of Discontinued Operation			4,000
Discontinued Operation, Intra-Entity Amounts, Discontinued Operation after Disposal, Expense			6,000
Proceeds from Divestiture of Businesses, Net of Cash Divested			$ 301,000
Cash Provided by (Used in) Investing Activities, Discontinued Operations	(4,000)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	15,000
Intercompany Sales between Continuing and Discontinued Operations	$ (8,000)

Discontinued Operations (Detail

Discontinued Operations (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended	8 Months Ended	12 Months Ended
	Mar. 01, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Proceeds from Divestiture of Businesses, Net of Cash Divested					$ 301,297	$ 10,304
Net (loss) income from discontinued operations				$ (4,397)	(6,746)	7,852
Proceeds from disposals of business/investment				0	301,297	10,304
Cash disposed as part of divestment			$ 7,116	0	0	7,116	$ 0
Cash Provided by (Used in) Operating Activities, Discontinued Operations			64,000
Cash Provided by (Used in) Investing Activities, Discontinued Operations			29,000
Cash Provided by (Used in) Financing Activities, Discontinued Operations			1,000
Commitments and Contingencies Disclosure [Abstract]
Intercompany Sales between Continuing and Discontinued Operations			$ 29,000
Purchases under supply agreement				24,000	42,000
PGW
Proceeds from Divestiture of Businesses, Net of Cash Divested		$ 301,000
Net (loss) income from discontinued operations				$ (4,397)	$ (6,746)	$ 7,852
Proceeds from disposals of business/investment		316,000
Cash disposed as part of divestment		$ 15,000
Cash Provided by (Used in) Operating Activities, Discontinued Operations	$ (4,000)
Cash Provided by (Used in) Investing Activities, Discontinued Operations	(4,000)
Cash Provided by (Used in) Financing Activities, Discontinued Operations	15,000
Commitments and Contingencies Disclosure [Abstract]
Intercompany Sales between Continuing and Discontinued Operations	$ (8,000)
Vitro S. A. B. de C.V. [Member] | PGW
Disposal Date		Mar. 1, 2017

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	Dec. 01, 2016USD ($)	Feb. 22, 2019USD ($)shares	Feb. 22, 2019SEK (kr)shares	Mar. 01, 2017USD ($)	Dec. 31, 2018USD ($)shares	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2018SEK (kr)	Mar. 31, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2017SEK (kr)	Mar. 31, 2017USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2018USD ($)shares	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2018SEK (kr)shares	Sep. 30, 2018SEK (kr)	Dec. 31, 2015USD ($)
Summary of Significant Accounting Policies [Line Items]
Goodwill					$ 4,381,458									$ 3,054,769	$ 4,381,458		$ 3,536,511		$ 3,054,769			$ 2,319,246
Other intangibles, net					928,752										928,752		743,769
Restricted Cash					5,489									0	5,489		0		0
Self Insurance Reserve					105,000										105,000		94,000
Impairment of goodwill					33,000										33,244		0		0
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Reserve for uncollectible accounts					57,000										57,000		58,000
Inventory Disclosure [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory					394,259										$ 394,259		150,342
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, Depreciation Methods															straight-line method
Depreciation															$ 157,000		129,000		115,000
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense															137,000		102,000		83,000
Estimated annual amortization expense in year one					140,000										140,000
Estimated annual amortization expense in year two					110,000										110,000
Estimated annual amortization expense in year three					80,000										80,000
Estimated annual amortization expense in year four					66,000										66,000
Estimated annual amortization expense in year five					59,000										59,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity method investments					179,169									183,467	179,169		208,404		183,467
Investments in unconsolidated subsidiaries				$ 0										(4,400)	60,300		7,664		185,671
Derivative Asset, Noncurrent					22,636										22,636		24,606
Equity in (losses) earnings of unconsolidated subsidiaries															$ 64,471		$ (5,907)		$ 592
Share Price of the Equity Method Investment | kr																				kr 92	kr 126
Share Price of Equity Method Investment | kr			kr 69
Effective Income Tax Rate Reconciliation, Amount [Abstract]
U.S. federal statutory rate												35.00%			21.00%		35.00%		35.00%
Adoption of ASU 2018-02 (see Note 4)															$ 5,345
Self Insurance Reserve, Current					52,000										52,000		$ 43,000
Outstanding letters of credit					65,000										65,000		71,000
Stock Repurchase Program, Authorized Amount					500,000										$ 500,000
Stock Repurchased During Period, Shares | shares		1,800,000	1,800,000												2,300,000
Treasury Stock, Value					$ 60,000										$ 60,000		0
Percentage Threshold For Uncertain Tax Positions															50.00%
Treasury Stock, Common, Shares | shares					2,271,707										2,271,707					2,271,707
Payments for Repurchase of Common Stock		$ 46,000													$ (60,000)		$ 0		$ 0
Stock Repurchase Program Remaining Authorized Repurchases, Amount					$ 440,000										$ 440,000
Mekonomen [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity Method Investment, Ownership Percentage					26.60%										26.60%					26.60%
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Share Price		24.90%	24.90%
Revolving Credit Facility [Member]
Summary of Significant Accounting Policies [Line Items]
Weighted average interest rates					1.90%										1.90%		2.20%			1.90%
ManufacturedProducts [Member]
Inventory Disclosure [Abstract]
Inventory, Raw Materials and Supplies, Gross					$ 17,000										$ 17,000		$ 10,000
Inventory, Work in Process, Gross					2,000										2,000		2,000
Inventory, Finished Goods, Gross					4,000										4,000		4,000
Stahlgruber [Member]
Summary of Significant Accounting Policies [Line Items]
Goodwill					908,253										908,253
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Reserve for uncollectible accounts					3,000										3,000
Inventory Disclosure [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory					380,238										380,238
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Acquired During Period															908,000
Warn Industries [Member]
Summary of Significant Accounting Policies [Line Items]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles															5,000
Rhiag
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Acquired During Period												$ 5,000						$ 591,000	585,000
PGW
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill, Acquired During Period													$ 3,000			$ 208,000			205,000
Mekonomen [Member]
Summary of Significant Accounting Policies [Line Items]
Equity Method Investments, Fair Value Disclosure					154,000										154,000
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity method investments					134,000										134,000
Equity Method Investment, Additional Information	December 1, 2016
Equity Method Investment, Ownership Percentage	26.50%
Investments in unconsolidated subsidiaries	$ 181,000				48,000
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity					85,000										85,000
Equity in (losses) earnings of unconsolidated subsidiaries															64,000		(7,000)
Proceeds from Equity Method Investment, Distribution							$ 8,000	kr 67,000,000		$ 7,000	kr 67,000,000
Accumulated Other Comprehensive Income (Loss)
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2018-02 (see Note 4)									$ 5,000						5,345
Increase to total leased assets [Member] | Minimum
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2016-02					1,200,000										1,200,000
Increase to total leased assets [Member] | Maximum
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2016-02					1,400,000										1,400,000
Increase to total liabilities [Member] | Minimum
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2016-02					1,200,000										1,200,000
Increase to total liabilities [Member] | Maximum
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Adoption of ASU 2016-02					1,400,000										1,400,000
Right to acquire equity method investment [Domain] | Mekonomen [Member]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Derivative Asset, Noncurrent						$ 29,000
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings					(8,000)	$ 3,000									(5,168)		0		0
Amendment No. 3, Fourth Amended and Restate Credit Agreement [Member] | Revolving Credit Facility [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Outstanding letters of credit					65,000										65,000
Line of Credit Facility, Remaining Borrowing Capacity					1,700,000										1,700,000
Selling, General and Administrative Expenses [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Prior Period Reclassification Adjustment																	2,000
Selling, General and Administrative Expenses [Member]
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Prior Period Reclassification Adjustment																	2,000
Europe
Summary of Significant Accounting Policies [Line Items]
Goodwill					$ 2,300,289									1,099,976	2,300,289		1,414,898		1,099,976			$ 594,482
Impairment of goodwill															$ 0
Amount that fair value exceeds carrying value					15.00%										15.00%					15.00%
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures [Abstract]
Equity method investments					$ 162,765									$ 183,131	$ 162,765		$ 208,068		$ 183,131

Financial Statement Informati_3

Financial Statement Information Schedule of Inventory (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Product Information
Inventories (3)	$ 394,259	$ 150,342
Inventories	2,836,075	2,380,783	$ 1,935,237
Aftermarket and refurbished products
Product Information
Inventories	2,309,458	1,877,653
Salvage and remanufactured products
Product Information
Inventories	503,199	487,108
ManufacturedProducts [Member]
Accounting Policies [Abstract]
Inventory, Raw Materials, Gross	17,000	10,000
Inventory, Work in Process, Gross	2,000	2,000
Inventory, Finished Goods, Gross	4,000	4,000
Product Information
Inventories	$ 23,418	$ 16,022

Financial Statement Informati_4

Financial Statement Information Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	$ 1,840,442	$ 1,476,716
Less—Accumulated depreciation	(685,751)	(606,112)
Depreciation	157,000	129,000	$ 115,000
Land and improvements
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	177,998	137,790
Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	378,490	233,078
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	626,615	521,526
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	143,547	133,753
Vehicles And Trailers [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	176,186	161,269
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	58,919	31,794
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	278,687	257,506
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	65,471	$ 42,485
Stahlgruber [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	269,012
Property, Plant and Equipment, Gross including Construction in Progress	271,292
Stahlgruber [Member] | Land and improvements
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	47,281
Stahlgruber [Member] | Buildings and improvements
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	135,628
Stahlgruber [Member] | Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	49,384
Stahlgruber [Member] | Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	3,760
Stahlgruber [Member] | Vehicles And Trailers [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	643
Stahlgruber [Member] | Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	30,426
Stahlgruber [Member] | Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	1,890
Stahlgruber [Member] | Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment excluding construction in progress, gross	$ 2,280

Changes in Carrying Amount of G

Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2017	Jun. 30, 2017	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	$ (33,244)			$ (33,244)
Goodwill [Roll Forward]
Beginning balance		$ 3,054,769	$ 3,054,769	3,536,511		$ 3,054,769		$ 2,319,246
Business acquisitions and adjustments to previously recorded goodwill				972,890		314,817		842,809
Impairment of goodwill	(33,000)			(33,244)		0		0
Exchange rate effects				(94,699)		166,925		(107,286)
Ending balance	4,381,458			4,381,458		3,536,511		3,054,769
North America
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	(33,244)			(33,244)
Goodwill [Roll Forward]
Beginning balance		1,661,800	1,661,800	1,709,354		1,661,800		1,433,499
Business acquisitions and adjustments to previously recorded goodwill				6,805		39,836		226,483
Impairment of goodwill				(33,244)
Exchange rate effects				(9,383)		7,718		1,818
Ending balance	1,673,532			1,673,532		1,709,354		1,661,800
Europe
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	$ 0			$ 0
Amount that fair value exceeds carrying value	15.00%			15.00%
Goodwill [Roll Forward]
Beginning balance		1,099,976	1,099,976	$ 1,414,898		1,099,976		594,482
Business acquisitions and adjustments to previously recorded goodwill				970,923		155,366		614,437
Impairment of goodwill				0
Exchange rate effects				(85,532)		159,556		(108,943)
Ending balance	$ 2,300,289			2,300,289		1,414,898		1,099,976
Specialty
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss	0			0
Goodwill [Roll Forward]
Beginning balance		292,993	292,993	412,259		292,993		291,265
Business acquisitions and adjustments to previously recorded goodwill				(4,838)		119,615		1,889
Impairment of goodwill				0
Exchange rate effects				216		(349)		(161)
Ending balance	407,637			407,637		$ 412,259		292,993
Stahlgruber [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period				908,000
Goodwill [Roll Forward]
Ending balance	$ 908,253			$ 908,253
PGW
Goodwill [Line Items]
Goodwill, Acquired During Period			$ 3,000		$ 208,000			205,000
Rhiag
Goodwill [Line Items]
Goodwill, Acquired During Period		$ 5,000					$ 591,000	$ 585,000

Components of Other Intangibles

Components of Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Gross carrying amount	$ 1,279,145	$ 976,475
Accumulated amortization	(431,693)	(311,506)
Net	847,452	664,969
Other intangibles, net	928,752	743,769
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets
Gross carrying amount	496,166	327,332
Accumulated amortization	(94,451)	(75,095)
Net	401,715	252,237
Customer and supplier relationships
Finite-Lived Intangible Assets
Gross carrying amount	593,517	510,113
Accumulated amortization	(247,464)	(167,532)
Net	346,053	342,581
Software and technology related assets [Member]
Finite-Lived Intangible Assets
Gross carrying amount	176,118	124,049
Accumulated amortization	(79,283)	(59,081)
Net	96,835	64,968
Covenants not to compete
Finite-Lived Intangible Assets
Gross carrying amount	13,344	14,981
Accumulated amortization	(10,495)	(9,798)
Net	2,849	5,183
Warn Industries [Member]
Finite-Lived Intangible Assets
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	5,000
Trademarks [Member]
Finite-Lived Intangible Assets
Indefinite-Lived Intangible Assets (Excluding Goodwill)	$ 81,300	$ 78,800

Changes in Warranty Reserve (De

Changes in Warranty Reserve (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Warranty Reserve [Roll Forward]
Beginning balance	$ 23,151	$ 19,634
Warranty expense	43,682	38,608
Warranty claims	(43,571)	(35,091)
Ending balance	$ 23,262	$ 23,151

Financial Statement Informati_5

Financial Statement Information Schedule of New Accounting Pronouncements (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement Related Disclosures [Abstract]
Receivables, Net, Current	$ 1,154,083	$ 1,065,617	$ 1,027,106	$ 860,549
Prepaid Expense and Other Assets, Current	199,030	$ 178,987	134,479
Other assets	162,912		142,965
Other current liabilities	61,109		45,727
Deferred Income Taxes	$ (311,434)		$ (252,359)

Financial Statement Informati_6

Financial Statement Information Impact to financial statements as result of adoption of ASU 2014-09 (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016	Jan. 01, 2018
Assets
Revenue	$ 11,876,674	$ 9,736,909		$ 8,584,031
Receivables, net	1,154,083	1,027,106		860,549	$ 1,065,617
Net Cash Provided by (Used in) Operating Activities	710,739	518,900		635,014
Net Cash Provided by (Used in) Financing Activities	882,995	(112,567)		1,225,737
Net income attributable to LKQ stockholders	$ 480,118	$ 533,744		$ 463,975
Net income attributable to LKQ stockholders	$ 1.53	$ 1.73		$ 1.51
Net income attributable to LKQ stockholders	$ 1.52	$ 1.72		$ 1.50
Prepaid expenses and other current assets	$ 199,030	$ 134,479			178,987
Liabilities [Abstract]
Refund liability	104,585	0			83,019
Accounts payable	942,398	788,613
Other current liabilities	61,109	45,727
Cost of goods sold	7,301,817	5,937,286		$ 5,232,328
Selling, general and administrative expenses (1), (2)	3,352,731	$ 2,715,407	[1]	$ 2,359,110
Adjustment Due to ASC 606 [Member]
Assets
Receivables, net					38,511
Prepaid expenses and other current assets					44,508
Liabilities [Abstract]
Refund liability					$ 83,019
Amount of adjustment to prior balance [Member]
Assets
Revenue	11,884,651
Receivables, net	1,105,937
Prepaid expenses and other current assets	142,591
Liabilities [Abstract]
Refund liability	0
Cost of goods sold	7,306,885
Selling, general and administrative expenses (1), (2)	3,355,640
Adjustment Due to ASC 606 [Member]
Assets
Revenue	(7,977)
Receivables, net	48,146
Prepaid expenses and other current assets	56,439
Liabilities [Abstract]
Refund liability	104,585
Cost of goods sold	(5,068)
Selling, general and administrative expenses (1), (2)	$ (2,909)
[1]	(1) Selling, general and administrative expenses contain facility and warehouse expenses and distribution expenses that were previously shown separately.

Financial Statement Informati_7

Financial Statement Information Equity Method Investments (Details) - USD ($) $ in Thousands	Dec. 01, 2016	Mar. 01, 2017	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Other than Temporary Impairment						$ 70,895	$ 0	$ 0
Payments to Acquire Equity Method Investments		$ 0			$ (4,400)	60,300	7,664	185,671
Equity in (losses) earnings of unconsolidated subsidiaries						64,471	(5,907)	$ 592
Mekonomen [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Other than Temporary Impairment			$ 48,000	$ 23,000
Payments to Acquire Equity Method Investments	$ 181,000		$ 48,000
Equity in (losses) earnings of unconsolidated subsidiaries						$ 64,000	$ (7,000)
Equity Method Investment, Additional Information	December 1, 2016
Equity Method Investment, Ownership Percentage	26.50%
Mekonomen [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage			26.60%			26.60%

Financial Statement Informati_8

Financial Statement Information Finite-Lived Intangible Assets Acquired as Part of Business Combination (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Stahlgruber [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 285,255,000
Stahlgruber [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	173,946,000
Stahlgruber [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	77,980,000
Stahlgruber [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	33,329,000
Stahlgruber [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	0
All 2018 Acquisitions excluding Stahlgruber [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	30,025,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	8,870,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	20,779,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	376,000
All 2018 Acquisitions excluding Stahlgruber [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	0
All 2018 Acquisitions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	315,280,000
All 2018 Acquisitions [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	182,816,000
All 2018 Acquisitions [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	98,759,000
All 2018 Acquisitions [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	33,705,000
All 2018 Acquisitions [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired	$ 0
All 2017 Acquisitions [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 181,216
All 2017 Acquisitions [Member] | Trademarks and Trade Names [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		87,306
All 2017 Acquisitions [Member] | Customer and supplier relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		75,450
All 2017 Acquisitions [Member] | Software and technology related assets [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		15,757
All 2017 Acquisitions [Member] | Covenants not to compete [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired		$ 2,703

Financial Statement Informati_9

Financial Statement Information Finite-Lived Intangible Assets Acquired As Part Of Business Combination, Remaining Useful Life (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
All 2018 Acquisitions excluding Stahlgruber [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	8 years 6 months
All 2018 Acquisitions excluding Stahlgruber [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	10 years
All 2018 Acquisitions excluding Stahlgruber [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	7 years 10 months 24 days
All 2018 Acquisitions excluding Stahlgruber [Member] | Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	6 years 6 months
Stahlgruber [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years 4 months 24 days
Stahlgruber [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	18 years
Stahlgruber [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	3 years
Stahlgruber [Member] | Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 2 months
All 2018 Acquisitions [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
All 2018 Acquisitions [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	17 years 7 months
All 2018 Acquisitions [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	4 years
All 2018 Acquisitions [Member] | Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	5 years 2 months
All 2017 Acquisitions [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		16 years 6 months
All 2017 Acquisitions [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		11 years 2 months 12 days
All 2017 Acquisitions [Member] | Customer and supplier relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		18 years 7 months 6 days
All 2017 Acquisitions [Member] | Computer Software, Intangible Asset [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		11 years 1 month 6 days
All 2017 Acquisitions [Member] | Covenants not to compete [Member]
Finite-Lived Intangible Assets [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		4 years 4 months 24 days

Revenue Recognition Disaggreg_2

Revenue Recognition Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue Recognition [Line Items]
Revenue	$ 11,876,674	$ 9,736,909	$ 8,584,031
Contract with Customer, Refund Liability	105,000
Contract with Customer, Right to Recover Product	56,000
Contract With Customer, Right Of Return, Net		38,000
Revenue, Variable Consideration Reserve	103,000	78,000
North America
Revenue Recognition [Line Items]
Revenue	5,182,609	4,799,651	4,444,625
Europe
Revenue Recognition [Line Items]
Revenue	5,221,754	3,636,811	2,920,470
Specialty
Revenue Recognition [Line Items]
Revenue	1,477,680	1,305,516	1,223,723
Parts and Services
Revenue Recognition [Line Items]
Revenue	11,233,407	9,208,634	8,144,645
Parts and Services | North America
Revenue Recognition [Line Items]
Revenue	4,558,220	4,278,531	4,009,129
Parts and Services | Europe
Revenue Recognition [Line Items]
Revenue	5,202,231	3,628,906	2,915,841
Parts and Services | Specialty
Revenue Recognition [Line Items]
Revenue	1,472,956	1,301,197	1,219,675
Other Revenue
Revenue Recognition [Line Items]
Revenue	643,267	$ 528,275	$ 439,386
Stahlgruber [Member]
Revenue Recognition [Line Items]
Revenue, Variable Consideration Reserve	$ 26,000

Revenue Recognition Movement in

Revenue Recognition Movement in Standard Product Warranty Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Product Warranty Liability [Line Items]
Revenue, Variable Consideration Reserve	$ 103,000	$ 78,000
Deferred Service-Type Warranty Revenue	24,006	$ 19,465
Deferred Revenue, Additions	38,736
Deferred Revenue, Revenue Recognized	$ (34,195)
Minimum
Product Warranty Liability [Line Items]
Standard Product Warranty Period	6 months
Maximum
Product Warranty Liability [Line Items]
Standard Product Warranty Period	36 months
Stahlgruber [Member]
Product Warranty Liability [Line Items]
Revenue, Variable Consideration Reserve	$ 26,000

Restructuring and Acquisition_2

Restructuring and Acquisition Related Expenses - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs	$ 18	$ 15	$ 22
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs	14	5	16
Specialty
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs	3		10
Stahlgruber [Member]
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs	16	4
Andrew Page
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs		$ 5
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs	10
Rhiag
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs			11
PGW
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs			4
All 2016 Acquisitions Excluding Rhiag and PGW [Member]
Acquisition Related Expenses [Abstract]
Business Combination, Acquisition Related Costs			7
Europe
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs			2
Maximum
Acquisition And Restructuring Integration Plans [Abstract]
Expected future restructuring expenses	$ (15)
North America
Acquisition And Restructuring Integration Plans [Abstract]
Restructuring Costs			$ 3

Equity Incentive Plans - Additi

Equity Incentive Plans - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	2 Months Ended	12 Months Ended
	Feb. 28, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 32.15	$ 29.05
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		70,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant		11,000,000
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year One		$ 15,166
Stock-based compensation expense		22,760	$ 22,832	$ 22,472
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense		$ (5,220)	$ (5,459)	$ (8,268)
RSUs [Abstract]
RSUs granted, shares		189,204	235,537	261,851
Share Based Compensation, Restricted Stock Units Approved For Grant	$ 24,000
Stock Options [Abstract]
Allocated Share-based Compensation Expense, Net of Tax		$ 17,540	$ 17,373	$ 14,077
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Two		9,715
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Three		6,315
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Four		3,458
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Five		150
Unrecognized Stock Based Compensation Expense Expected To Be Recognized Total		$ 34,804
RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 42.58
Stock-based compensation expense		$ 22,760	22,826	22,183
RSUs [Abstract]
RSUs granted, shares		601,802
Fair value of RSUs vested during the period		$ 27,000	28,000	29,000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		$ 8,000	7,000	7,000
RSUs [Abstract]
Reporting period of positive diluted earnings per share		5 years
Share Based Compensation, Restricted Stock Units Approved For Grant	$ 3,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		$ 0	6	162
Stock Options [Abstract]
Options granted during the period		0
Options vested during the period		0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value			1,000
Minimum | Stock options
Stock Options [Abstract]
Stock options expiration period		6 years
Maximum | RSUs
Stock Options [Abstract]
Vesting period		5 years
Maximum | Stock options
Stock Options [Abstract]
Stock options expiration period		10 years
Vesting period		5 years
Cost of Goods, Total [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		$ 469	434	407
Selling, General and Administrative Expenses [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		22,291	22,398	21,938
Continuing Operations [Member]
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense		$ 22,760	$ 22,832	$ 22,345

Stock-Based Compensation Schedu

Stock-Based Compensation Schedule of Unvested Restricted Stock Units Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shares Outstanding [Abstract]
RSUs granted, shares	189,204	235,537	261,851
Weighted Average Fair Value [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 32.15	$ 29.05
RSUs
Shares Outstanding [Abstract]
Unvested RSUs, shares	1,475,682	1,624,390
RSUs granted, shares	601,802
RSUs vested, shares	(704,909)
RSUs forfeited/canceled, shares	(45,601)
RSUs expected to vest	1,351,169
lkq_expected_to_vest_other_than_options_weighted_average_per_share	$ 34.89
Weighted Average Fair Value [Abstract]
Unvested RSUs, weighted average grant date fair value	34.94	$ 29.94
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	42.58
RSUs vested, weighted average grant date fair value	30.03
RSUs forfeited/canceled, weighted average grant date fair value	$ 33.43
RSUs expected to vest, weighted average remaining contractual term	2 years 124 days
RSUs expected to vest, aggregate intrinsic value	$ 32,063

Stock-Based Compensation Sche_2

Stock-Based Compensation Schedule of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Aggregate Intrinsic Value [Abstract]
Stock options exercised, aggregate intrinsic value		$ 21,000	$ 28,000
Stock options
Shares Outstanding [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,051,494	1,738,073
Stock options exercised, shares	(686,070)
Stock options forfeited/canceled, shares	(509)
Exercisable and expected to vest stock options, shares	1,051,494
Weighted Average Fair Value [Abstract]
Stock options outstanding, weighted average exercise price	$ 10.15	$ 9.20
Stock options exercised, weighted average exercise price	7.73
Stock options forfeited/canceled, weighted average exercise price	32.31
Exercisable and expected to vest stock options, weighted average exercise price	$ 10.15
Weighted Average Contractual Term [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term	323 days
Exercisable and expected to vest stock options, weighted average remaining contractual term (years)	323 days
Aggregate Intrinsic Value [Abstract]
Stock options exercised, aggregate intrinsic value	$ 17,504
Stock options outstanding, aggregate intrinsic value	14,570
Exercisable and expected to vest stock options, aggregate intrinsic value	$ 14,570

Schedule of Stock-Based Compens

Schedule of Stock-Based Compensation Expense Expected to be Recognized (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year One	$ 15,166
Unrecognized Stock Based Compensation Expense Expected To Be Recognized Total	34,804
Stock-based compensation expense	22,760	$ 22,832	$ 22,472
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Two	9,715
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Three	6,315
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Four	3,458
Unrecognized Stock Based Compensation Expense Expected To Be Recognize In Year Five	150
RSUs
Share-based Compensation Arrangement by Share-based Payment Award
Stock-based compensation expense	$ 22,760	$ 22,826	$ 22,183

Earnings Per Share Earnings P_2

Earnings Per Share Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Earnings Per Share, Basic and Diluted [Line Items]
Income from continuing operations	$ 487,565	$ 536,974	$ 456,123
Denominator for basic earnings per share—Weighted-average shares outstanding	314,428	308,607	306,897
Effect of dilutive securities:
Denominator for diluted earnings per share—Adjusted weighted-average shares outstanding	315,849	310,649	309,784
Basic earnings per share from continuing operations	$ 1.55	$ 1.74	$ 1.49
Diluted earnings per share from continuing operations	$ 1.54	$ 1.73	$ 1.47
RSUs
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	409	544	689
Stock options
Effect of dilutive securities:
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,012	1,498	2,198

Schedule of Antidilutive Securi

Schedule of Antidilutive Securities Excluded from Computation of Diluted Earnings Per Share (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities	410	37	57
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Antidilutive securities	8	39	63

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ 174,950	$ 70,476	$ 267,175	$ 105,470
Pretax income (loss)	(74,346)	162,262	(156,082)
Income tax effect	(4,742)	8,924	(7,217)
Reclassification of unrealized loss (gain)	(37,063)	46,571	2,285
Reclassification of deferred income taxes	8,675	(17,824)	(691)
Other comprehensive income from unconsolidated subsidiaries	(2,343)	(1,309)
Adoption of ASU 2018-02 (see Note 4)	5,345
Disposal of unrealized (loss) gain on pension plan for disposed businesses		(1,925)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	177,597	71,933	272,529	96,890
Pretax income (loss)	(113,030)	206,451	(175,639)
Income tax effect	4,507	(7,366)	0
Reclassification of unrealized loss (gain)	0	0	0
Reclassification of deferred income taxes	0	0	0
Other comprehensive income from unconsolidated subsidiaries	0	0
Adoption of ASU 2018-02 (see Note 4)	2,859
Disposal of unrealized (loss) gain on pension plan for disposed businesses		1,511
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(14,374)	(11,538)	(8,091)	932
Pretax income (loss)	37,552	(44,550)	12,382
Income tax effect	(8,846)	16,390	(4,581)
Reclassification of unrealized loss (gain)	(37,009)	50,090	1,789
Reclassification of deferred income taxes	8,653	(18,483)	(567)
Other comprehensive income from unconsolidated subsidiaries	0	0
Adoption of ASU 2018-02 (see Note 4)	2,486
Disposal of unrealized (loss) gain on pension plan for disposed businesses		0
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	8,075	8,772	2,737	7,648
Pretax income (loss)	1,132	361	7,175
Income tax effect	(403)	(100)	(2,636)
Reclassification of unrealized loss (gain)	(54)	(3,519)	496
Reclassification of deferred income taxes	22	659	(124)
Other comprehensive income from unconsolidated subsidiaries	0	0
Adoption of ASU 2018-02 (see Note 4)	0
Disposal of unrealized (loss) gain on pension plan for disposed businesses		(3,436)
Accumulated Gain (Loss) from Unconsoldated Subsidiaries [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	3,652	1,309	0	$ 0
Pretax income (loss)	0	0	0
Income tax effect	0	0	0
Reclassification of unrealized loss (gain)	0	0	0
Reclassification of deferred income taxes	0	0	$ 0
Other comprehensive income from unconsolidated subsidiaries	(2,343)	(1,309)
Adoption of ASU 2018-02 (see Note 4)	0
Disposal of unrealized (loss) gain on pension plan for disposed businesses		0
Cross Currency Fx Forward Contract [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax	$ 9,000	$ 9,000

Accumulated Other Comprehensi_4

Accumulated Other Comprehensive Income (Loss) Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02 (see Note 4)		$ 5,345
Interest Rate Swap
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		7,000	$ (2,000)	$ (4,000)
Cross Currency Fx Forward Contract [Member]
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		9,000	9,000
Cross Currency Interest Rate Contract [Member]
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax		21,000	$ (57,000)	$ 2,000
Accumulated Other Comprehensive Income (Loss)
Schedule of Accumulated Other Comprehensive Income (Loss) [Line Items]
Adoption of ASU 2018-02 (see Note 4)	$ 5,000	$ 5,345

Long-Term Obligations - Additio

Long-Term Obligations - Additional Information (Details) $ in Thousands, € in Millions	Mar. 24, 2016USD ($)	Mar. 24, 2016EUR (€)	Dec. 31, 2018USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2018USD ($)	Jan. 29, 2024USD ($)	Dec. 20, 2018USD ($)	Nov. 20, 2018USD ($)	Apr. 09, 2018EUR (€)	Dec. 31, 2017USD ($)	Dec. 01, 2017USD ($)	Apr. 14, 2016	Mar. 24, 2016EUR (€)	May 09, 2013USD ($)
Debt Instrument
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt	$ 520,000												€ 465
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months			$ 122,117		$ 122,117
Outstanding letters of credit			65,000		65,000					$ 71,000
RestrictivePaymentsUnderBorrowingAgreement			1,700,000		1,700,000
Long-term Debt, Maturities, Repayments of Principal in Year Two			49,193		49,193
Long-term Debt, Maturities, Repayments of Principal in Year Three			137,192		137,192
Long-term Debt, Maturities, Repayments of Principal in Year Four			24,410		24,410
Long-term Debt, Maturities, Repayments of Principal in Year Five			621,560		621,560
Long-term Debt, Maturities, Repayments of Principal after Year Five			3,393,225		3,393,225
Debt and Capital Lease Obligations			4,347,697		4,347,697					3,428,280
Interest Paid	8,000	€ 7
Payment for Debt Extinguishment or Debt Prepayment Cost	24,000	21
Payments for Derivative Instrument, Financing Activities	$ 5,000	€ 4
US Notes (2023) [Member]
Debt Instrument
Long-term Debt			600,000		600,000					600,000
Senior notes interest rate														4.75%
Euro Notes (2024)
Debt Instrument
Payments of Financing Costs				$ 10,000
Long-term Debt			573,350		573,350					600,150
Senior notes interest rate												3.875%
Euro Notes 2026/28 [Member]
Debt Instrument
Payments of Financing Costs					16,000
Long-term Debt			1,146,700		1,146,700				€ 1,000	0
Receivables securitization
Debt Instrument
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount			110,000		110,000					100,000
Revolving Credit Facility [Member]
Debt Instrument
Long-term Line of Credit			$ 1,700,000		$ 1,700,000					$ 2,000,000
Weighted average interest rates			1.90%		1.90%					2.20%
Amendment No. 3, Fourth Amended and Restate Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity								$ 3,150,000
Line of Credit Facility, Frequency of Payments					quarterly installments
Line of Credit Facility, Periodic Payment					$ 2,000	$ 4,000
Increment change in applicable margin											0.25%
Long-Term Line of Credit, Current			$ 9,000		9,000					$ 18,000
Outstanding letters of credit			65,000		65,000
Line of Credit Facility, Remaining Borrowing Capacity			$ 1,700,000		1,700,000
Payments of Financing Costs					$ 4,000
Amendment No. 3, Fourth Amended and Restate Credit Agreement [Member] | Letter of Credit [Member]
Debt Instrument
Line of Credit Facility, Commitment Fee Percentage			0.125%
Fourth Amended Credit Agreement | Revolving Credit Facility [Member]
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity											$ 2,750,000
Mitsubishi UFJ [Member] | Receivables securitization
Debt Instrument
Line of Credit Facility, Maximum Borrowing Capacity							$ 110,000
Weighted average interest rates			3.40%		3.40%
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount			$ 110,000		$ 110,000					100,000
Twenty Twenty Three [Domain] | US Notes (2023) [Member]
Debt Instrument
Long-term Debt														$ 600,000
TwentyTwentySix [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €									€ 750
Senior notes interest rate									3.625%
TwentyTwentyEight [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €									€ 250
Senior notes interest rate									4.125%
Net Receivables [Member] | Mitsubishi UFJ [Member] | Receivables securitization
Debt Instrument
Debt Instrument, Collateral Amount			$ 132,000		$ 132,000					$ 144,000
Maximum increment [Member] | Amendment No. 2, Fourth Amended and Restate Credit Agreement [Member] | Revolving Credit Facility [Member]
Debt Instrument
Increment change in commitment fees			0.05%		0.05%

Schedule of Long-Term Obligatio

Schedule of Long-Term Obligations (Details) $ in Thousands, € in Millions	Nov. 20, 2018USD ($)	Mar. 24, 2016USD ($)	Mar. 24, 2016EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Apr. 09, 2018EUR (€)	Apr. 14, 2016EUR (€)	Mar. 24, 2016EUR (€)
Debt Instrument
Borrowings under revolving credit facilities				$ 1,667,325	$ 839,171	$ 2,636,596
Repayments of Long-term Debt				354,800	27,884	$ 255,792
Debt Incurred under Line of Credit Facility, Used to Repay Debt Acquired		$ 508,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Debt		520,000							€ 465
Interest Paid		8,000	€ 7
Payment for Debt Extinguishment or Debt Prepayment Cost		24,000	21
Payments for Derivative Instrument, Financing Activities		$ 5,000	€ 4
Long-term obligations, total				4,347,697	3,428,280
Deferred Finance Costs, Noncurrent, Net				(36,906)	(21,476)
Deferred Finance Costs, Current, Net				(291)	(2,824)
Long-term obligations, total, net				4,310,500	3,403,980
Current portion of long-term obligations				(121,826)	(126,360)
Long-term obligations, excluding current portion				4,188,674	3,277,620
Loans Payable
Debt Instrument
Borrowings under revolving credit facilities	$ 400,000
Repayments of Long-term Debt	$ 240,000
Term loan				350,000	704,800
Revolving Credit Facility [Member]
Debt Instrument
Long-term Line of Credit				1,387,177	1,283,551
US Notes (2023) [Member]
Debt Instrument
Long-term Debt				600,000	600,000
Euro Notes (2024)
Debt Instrument
Long-term Debt				573,350	600,150
Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt				1,146,700	0		€ 1,000
Receivables securitization
Debt Instrument
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount				110,000	100,000
Notes payable
Debt Instrument
Notes Payable				23,056	29,146
Other Long Term Debt
Debt Instrument
Other long-term debt				157,414	110,633
Revolving Credit Facility [Member]
Debt Instrument
Long-term Line of Credit				$ 1,700,000	$ 2,000,000
Twenty Twenty Four [Domain] | Euro Notes (2024)
Debt Instrument
Long-term Debt | €								€ 500
TwentyTwentySix [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €							750
TwentyTwentyEight [Member] | Euro Notes 2026/28 [Member]
Debt Instrument
Long-term Debt | €							€ 250

Schedule of Long-Term Obligat_2

Schedule of Long-Term Obligations (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument
Debt Issuance Costs, Gross	$ 37
Notes payable
Debt Instrument
Debt, Weighted Average Interest Rate		2.00%	1.40%
Other Long Term Debt
Debt Instrument
Debt, Weighted Average Interest Rate		2.50%	1.70%

Derivative Instruments and He_3

Derivative Instruments and Hedging Activities (Details) $ in Thousands, € in Millions	3 Months Ended		12 Months Ended
	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2018EUR (€)	Dec. 31, 2016EUR (€)
Effect of Netting Derivative Instruments	$ (14,000)		$ (14,000)	$ (12,000)
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	2,000		2,000
Derivative Asset, Current	211		211
Derivative Liability, Current	127		127
Settlement of Notional Amounts | €						€ (15)
Derivative Asset, Noncurrent	22,636		22,636	24,606
Derivative Liability, Noncurrent	40,870		40,870	61,492
Interest Rate Swap Sold [Member]
Derivative, Notional Amount	110,000		110,000
Interest Rate Swap [Member]
Derivative, Notional Amount	480,000		480,000	590,000
Derivative Asset, Current	0		0
Derivative Liability, Current	0		0
Derivative Liability, Noncurrent	0		0	0
Cross Currency Interest Rate Contract [Member]
Derivative, Notional Amount	574		574	406,546	$ 422,000		€ 400
Derivative Asset, Current	211		211
Derivative Liability, Current	127		127
Derivative Asset, Noncurrent	7,669		7,669	5,504
Derivative Liability, Noncurrent	40,870		40,870	61,492
Interest Rate Swap [Member]
Assets, Fair Value Disclosure	14,967		14,967
Right to acquire equity method investment [Domain] | Mekonomen [Member]
Derivative Asset, Noncurrent		$ 29,000
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	8,000	$ (3,000)	5,168	0	$ 0
2018 Cross Currency Swaps [Member] | Cross Currency Interest Rate Contract [Member]
Derivative, Notional Amount	184,000		184,000			€ 160
Fair Value, Measurements, Recurring [Member]
Assets, Fair Value Disclosure	$ 70,496		$ 70,496	70,590
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Assets, Fair Value Disclosure				$ 19,102

Fair Value Measurements (Detail

Fair Value Measurements (Details) $ in Thousands, € in Billions	Dec. 31, 2018USD ($)	Apr. 09, 2018EUR (€)	Dec. 31, 2017USD ($)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Liability, Noncurrent	$ 40,870		$ 61,492
Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	14,967
Fair Value, Measurements, Recurring [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	70,496		70,590
Financial and Nonfinancial Liabilities, Fair Value Disclosure	95,190		111,327
Fair Value, Measurements, Recurring [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	47,649		45,984
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure			19,102
Fair Value, Measurements, Recurring [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,209		2,636
Fair Value, Measurements, Recurring [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	48,984		47,199
Fair Value, Measurements, Recurring [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	7,880		5,504
Financial and Nonfinancial Liabilities, Fair Value Disclosure	40,997		61,492
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	70,496		70,590
Financial and Nonfinancial Liabilities, Fair Value Disclosure	89,981		108,691
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	47,649		45,984
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	14,967		19,102
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	48,984		47,199
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	7,880		5,504
Financial and Nonfinancial Liabilities, Fair Value Disclosure	40,997		61,492
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,209		2,636
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cash Surrender Value [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Consideration Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	5,209		2,636
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Deferred Compensation Liabilities [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Assets, Fair Value Disclosure	0		0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0		0
Revolving Credit Facility [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Line of Credit	1,700,000		2,000,000
Euro Notes 2026/28 [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt	1,146,700	€ 1	0
Euro Notes (2024)
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt, Fair Value	586,000		658,000
Long-term Debt	573,350		600,150
Receivables securitization
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Transfers Accounted for as Secured Borrowings, Associated Liabilities, Carrying Amount	110,000		100,000
US Notes (2023) [Member]
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Long-term Debt, Fair Value	574,000		615,000
Long-term Debt	$ 600,000		$ 600,000

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended	8 Months Ended	12 Months Ended			96 Months Ended
	Mar. 01, 2017	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2025	Dec. 31, 2015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities				$ (83,415)	$ (65,087)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate				1,000
Unrecognized Tax Benefits that Would Impact Deferred Taxes			$ 1,000	$ 1,000	1,000	$ 1,000
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Change in Tax Liability Provisional Income Tax Expense Benefit					73,000
Effective Income Tax Rate Reconciliation, GILTI				0.30%
Current Federal Tax Expense (Benefit)				$ 90,216	196,825	159,547
Current State and Local Tax Expense (Benefit)				25,851	27,149	27,120
Current Foreign Tax Expense (Benefit)				77,508	58,123	45,545
Current Income Tax Expense (Benefit)				193,575	282,097	232,212
Deferred Federal Income Tax Expense (Benefit)				14,977	(37,486)	1,169
Deferred State and Local Income Tax Expense (Benefit)				4,386	4,044	2,131
Deferred Foreign Income Tax Expense (Benefit)				(21,543)	(13,095)	(14,946)
Deferred income taxes	$ 0		(4,516)	(2,180)	(46,537)	(16,162)
Provision for income taxes				191,395	235,560	220,566
Income (Loss) from Continuing Operations before Income Taxes, Domestic				562,758	575,148	513,844
Income (Loss) from Continuing Operations before Income Taxes, Foreign				180,673	191,479	163,437
Income from continuing operations before provision for income taxes				$ 743,431	$ 766,627	$ 677,281
U.S. federal statutory rate		35.00%		21.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Effect of U.S. Federal Tax Reform - Federal Deferred Tax Rate Change				0.00%	(9.50%)	0.00%
Effective Income Tax Rate Reconciliation, Effect of U.S. Federal Tax Reform - Transition Tax on Foreign Earnings				(1.30%)	6.60%	0.00%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent				3.50%	2.80%	2.70%
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Percent				0.90%	(3.20%)	(3.20%)
Effective Income Tax Rate Reconciliation, Notional Interest Deduction				(0.60%)	(0.90%)	(2.50%)
Effective Income Tax Rate Reconciliation, Excess Tax Benefit on Stock Based Payments, Percent				(0.60%)	(1.00%)	(1.60%)
Effective Income Tax Rate Reconciliation, Excess Tax Benefit on Stock Based Payments, Percent				1.60%	1.10%	1.30%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent				1.20%	(0.20%)	0.90%
Effective Income Tax Rate Reconciliation, Percent				25.70%	30.70%	32.60%
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities				$ 60,337	$ 40,317
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits				20,525	19,074
Deferred Tax Assets, Inventory				15,474	17,886
Deferred Tax Assets Tax Deferred Accounts Receivable				16,208	16,036
Interest Expense Deduction Carry Forward				20,392	13,845
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost				4,859	4,963
Deferred Tax Assets, Operating Loss Carryforwards				13,222	11,734
Deferred Tax Assets, Other				12,370	8,971
Deferred Tax Assets, Gross				163,387	132,826
Deferred Tax Assets, Valuation Allowance				(34,779)	(21,527)
Deferred Tax Assets, Net of Valuation Allowance				128,608	111,299
Deferred Tax Liabilities Goodwill and Intangible Assets Excluding Trade Name Intangible				216,699	192,688
Deferred Tax Liabilities Goodwill and Intangible Assets Excluding Trade Name Intangible				87,839	67,467
Deferred Tax Liabilities Trade Name Intangible				116,615	72,233
Deferred Tax Liabilities, Other				15,511	16,165
Deferred Tax Liabilities, Gross				436,664	348,553
Deferred Tax Liabilities, Net				(308,056)	(237,254)
Deferred Tax Assets, Net, Noncurrent				3,378	15,105
Deferred income taxes				311,434	252,359
Unrecognized Tax Benefits			2,146	1,237	1,690	$ 2,146		$ 2,273
Unrecognized Tax Benefits, Increase Resulting from Acquisition				0	73	0
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions				5	5	5
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations				(458)	(534)	(132)
Deferred Tax Assets, Tax Credit Carryforwards				1,000	2,000
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount				13,000
Valuation Allowance, due to interest expense deductions				6,000
Valuation Allowance, Deferred Tax Asset, Change in Amount, Due to NOLs				5,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued			$ 1,000	1,000	1,000	1,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit				1,000
Undistributed Earnings of Foreign Subsidiaries				664,000
Tax Cuts and Jobs Act of 2017 Transition Tax Adjustment for Accumulated Foreign Earnings Provisional Amount				10,000
Tax Cuts and Jobs Act of 2017 Transition Tax for Accumulated Foreign Earnings				41,000
Tax Cuts and Jobs Act of 2017, transition tax for accumulated foreign earnings, provisional amount					51,000
Tax Cuts and Jobs Acts of 2017 Transition Tax For Accumulated Foreign Earnings Provisional Amount Payment Period							8 years
Tax Cuts And Jobs Act Of 2017 Transition Tax For Accumulated Foreign Earnings Provisional Amount, Remaining				33,000
Stahlgruber [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities				(78,130)
PGW
Deferred Tax Assets, Capital Loss Carryforwards				5,000
Stahlgruber [Member]
Deferred Tax Liabilities, Net				78,000
Continuing Operations [Member]
Deferred income taxes				$ (2,180)	$ (46,537)	$ (11,646)

Employee Benefit Plans (Details

Employee Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Service Cost Rate		1.30%	1.50%	1.60%
Defined Benefit Plan, Plan with Benefit Obligation in Excess of Plan Assets, Benefit Obligation		$ 171,185	$ 126,031
Defined Benefit Plan, Service Cost		$ 3,215	$ 4,525	$ 3,843
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		2.10%	2.10%
Defined Benefit Plan, Plan Assets, Contributions by Employer Including Benefits Paid to Participants	$ 4,000	$ 12,000
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		2,000
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax		10,000
Defined Benefit Plan, Plan Assets, Business Combination		251	$ 0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)		3,018	3,307
Defined Benefit Plan, Plan Assets, Contributions by Employer		9,975	2,931
Defined Benefit Plan, Benefit Obligation		201,492	126,031	$ 111,547
Defined Benefit Plan, Benefit Obligation, Business Combination		79,211	938
Assets for Plan Benefits, Defined Benefit Plan		377	0
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation		169,097	125,389
Defined Benefit Plan Pension Plan With Projected Benefit Obligation In Excess Of Plan Assets, Plan Assets		$ 60,988	$ 82,852
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase		0.90%	1.30%
Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Interest Cost Rate Cost		2.50%	3.00%	3.00%
Cash and Cash Equivalents, at Fair Value		$ 30,684	$ 369
Defined Benefit Plan, Fair Value of Plan Assets		91,672	82,852	$ 73,057
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant		415	573
Defined Benefit Plan, Plan Assets, Benefits Paid		(2,788)	(3,040)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)		(2,051)	6,024
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Actual Return (Loss) on Plan Assets Still Held		2,556	464
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Purchases, Sales, and Settlements		(541)	483
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3		255	0
Defined Benefit Plans, Plan Assets Level 3 Reconciliation, Currency Translation		(2,056)	6,024
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months		5,818
Defined Benefit Plan, Expected Future Benefit Payment, Year Five		6,948
Defined Benefit Plan, Expected Future Benefit Payment, Year Four		6,966
Defined Benefit Plan, Expected Future Benefit Payment, Year Three		6,263
Defined Benefit Plan, Expected Future Benefit Payment, Year Two		5,627
Liability, Defined Benefit Plan, Noncurrent		(106,917)	(43,179)
Defined Benefit Plan, Interest Cost		3,476	3,670	2,719
Defined Benefit Plan, Expected Return (Loss) on Plan Assets		(2,949)	(2,467)	(2,624)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)		0	(181)	(266)
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		415	573
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)		(989)	4,539
Defined Benefit Plan, Benefit Obligation, Benefits Paid		(4,447)	(3,806)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Curtailment		0	(4,064)
Defined Benefit Plan, Benefit Obligation, Payment for Settlement		(756)	(245)
Defined Benefit Plan, Amortization of Gain (Loss)		(54)	473	762
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment		0	(3,811)	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement		74	(4)	$ 2
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter		39,823
Mutual Funds, at Fair Value		0	21,709
Insurance Contracts, at Fair Value		$ 60,988	$ 60,774
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase		1.90%	1.30%	2.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets		4.80%	5.00%	5.10%
Liability, Defined Benefit Plan, Current		$ (3,280)	$ 0
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position		(109,820)	(43,179)
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)		(4,664)	8,354
Defined Benefit Plan, Accumulated Benefit Obligation		199,337	125,389
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year		200
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position		(109,820)	(43,179)
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Fair Value of Plan Assets		60,988	82,852
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		3,762	2,205	$ 4,436
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash and Cash Equivalents, at Fair Value		30,684	369
Defined Benefit Plan, Fair Value of Plan Assets		30,684	22,078
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Mutual Funds, at Fair Value		0	21,709
Insurance Contracts, at Fair Value		0	0
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash and Cash Equivalents, at Fair Value		0	0
Defined Benefit Plan, Fair Value of Plan Assets		0	0
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Mutual Funds, at Fair Value		0	0
Insurance Contracts, at Fair Value		0	0
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan Disclosure [Line Items]
Cash and Cash Equivalents, at Fair Value		0	0
Defined Benefit Plan, Fair Value of Plan Assets		60,988	60,774	$ 53,803
Defined Benefit Plan, Funded (Unfunded) Status of Plan [Abstract]
Mutual Funds, at Fair Value		0	0
Insurance Contracts, at Fair Value		$ 60,988	$ 60,774

Future Minimum Lease Commitment

Future Minimum Lease Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$ 300,000	$ 247,000	$ 212,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months	294,269
Operating Leases, Future Minimum Payments, Due in Two Years	256,172
Operating Leases, Future Minimum Payments, Due in Three Years	210,632
Operating Leases, Future Minimum Payments, Due in Four Years	158,763
Operating Leases, Future Minimum Payments, Due in Five Years	131,518
Thereafter	777,165
Future Minimum Lease Payments	1,828,519
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 76,000

Segment and Geographic Inform_3

Segment and Geographic Information - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Segment Reporting Information
Revenue	$ 11,876,674	$ 9,736,909	$ 8,584,031
Segment EBITDA	1,251,399	1,116,590	1,004,980
Depreciation and amortization	$ 294,077	230,203	206,086
Number of operating segments	4
Number of reportable segments	3
Intersegment [Member]
Segment Reporting Information
Revenue	$ 0	0	0
Third Party [Member]
Segment Reporting Information
Revenue	11,876,674	9,736,909	8,584,031
North America
Segment Reporting Information
Revenue	5,182,609	4,799,651	4,444,625
Segment EBITDA	660,153	655,275	589,945
Depreciation and amortization	$ 87,348	86,303
Number of reportable segments	1
North America | Intersegment [Member]
Segment Reporting Information
Revenue	$ 645	750	739
North America | Third Party [Member]
Segment Reporting Information
Revenue	5,181,964	4,798,901	4,443,886
Europe
Segment Reporting Information
Revenue	5,221,754	3,636,811	2,920,470
Segment EBITDA	422,721	319,156	283,608
Depreciation and amortization	178,473	120,805
Europe | Intersegment [Member]
Segment Reporting Information
Revenue	0	0	0
Europe | Third Party [Member]
Segment Reporting Information
Revenue	5,221,754	3,636,811	2,920,470
Specialty
Segment Reporting Information
Revenue	1,477,680	1,305,516	1,223,723
Segment EBITDA	168,525	142,159	131,427
Depreciation and amortization	28,256	23,095
Specialty | Intersegment [Member]
Segment Reporting Information
Revenue	4,724	4,319	4,048
Specialty | Third Party [Member]
Segment Reporting Information
Revenue	1,472,956	1,301,197	1,219,675
Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	(5,369)	(5,069)	(4,787)
Segment EBITDA	0	0	0
Depreciation and amortization	0	0
Intersegment Eliminations [Member] | Intersegment [Member]
Segment Reporting Information
Revenue	(5,369)	(5,069)	(4,787)
Intersegment Eliminations [Member] | Third Party [Member]
Segment Reporting Information
Revenue	$ 0	$ 0	$ 0

Schedule of Financial Performan

Schedule of Financial Performance by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information
Revenue	$ 11,876,674	$ 9,736,909	$ 8,584,031
Segment EBITDA	1,251,399	1,116,590	1,004,980
Depreciation and amortization	294,077	230,203	206,086
North America
Segment Reporting Information
Revenue	5,182,609	4,799,651	4,444,625
Segment EBITDA	660,153	655,275	589,945
Depreciation and amortization	87,348	86,303
Europe
Segment Reporting Information
Revenue	5,221,754	3,636,811	2,920,470
Segment EBITDA	422,721	319,156	283,608
Depreciation and amortization	178,473	120,805
Specialty
Segment Reporting Information
Revenue	1,477,680	1,305,516	1,223,723
Segment EBITDA	168,525	142,159	131,427
Depreciation and amortization	28,256	23,095
Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	(5,369)	(5,069)	(4,787)
Segment EBITDA	0	0	0
Depreciation and amortization	0	0
Third Party [Member]
Segment Reporting Information
Revenue	11,876,674	9,736,909	8,584,031
Third Party [Member] | North America
Segment Reporting Information
Revenue	5,181,964	4,798,901	4,443,886
Third Party [Member] | Europe
Segment Reporting Information
Revenue	5,221,754	3,636,811	2,920,470
Third Party [Member] | Specialty
Segment Reporting Information
Revenue	1,472,956	1,301,197	1,219,675
Third Party [Member] | Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	0	0	0
Intersegment [Member]
Segment Reporting Information
Revenue	0	0	0
Intersegment [Member] | North America
Segment Reporting Information
Revenue	645	750	739
Intersegment [Member] | Europe
Segment Reporting Information
Revenue	0	0	0
Intersegment [Member] | Specialty
Segment Reporting Information
Revenue	4,724	4,319	4,048
Intersegment [Member] | Intersegment Eliminations [Member]
Segment Reporting Information
Revenue	$ (5,369)	$ (5,069)	(4,787)
Continuing Operations [Member]
Segment Reporting Information
Depreciation and amortization			198,334
Continuing Operations [Member] | North America
Segment Reporting Information
Depreciation and amortization			80,923
Continuing Operations [Member] | Europe
Segment Reporting Information
Depreciation and amortization			94,979
Continuing Operations [Member] | Specialty
Segment Reporting Information
Depreciation and amortization			22,432
Continuing Operations [Member] | Intersegment Eliminations [Member]
Segment Reporting Information
Depreciation and amortization			$ 0

Reconciliation Of Segment EBITD

Reconciliation Of Segment EBITDA To Net Income (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Segment Earnings Before Interest Taxes Depreciation And Amortization to Net Income Table [Line Items]
Interest expense			$ 146,377	$ 101,640	$ 88,263
Loss on debt extinguishment			(1,350)	(456)	(26,650)
Net income			483,168	530,228	463,975
Less: net income (loss) attributable to noncontrolling interest			3,050	(3,516)	0
Noncontrolling interest	$ 56,454		56,454	8,484
Net income attributable to LKQ stockholders			480,118	533,744	463,975
Net (loss) income from discontinued operations			(4,397)	(6,746)	7,852
Net income from continuing operations attributable to LKQ stockholders			484,515	540,490	456,123
Depreciation and amortization			274,213	219,546	191,433
Depreciation and amortization - cost of goods sold			19,864	10,657	6,901
Interest Income (Expense), Nonoperating, Net			144,536	100,620	87,682
Provision for income taxes			191,395	235,560	220,566
EBITDA			1,115,873	1,107,329	989,355
Equity in (losses) earnings of unconsolidated subsidiaries			64,471	(5,907)	592
Gains on foreign exchange contracts - acquisition related			0	0	18,342
Gains on bargain purchases			2,418	3,870	8,207
Restructuring and acquisition related expenses			32,428	19,672	37,762
Inventory step-up adjustment - acquisition related			403	3,584	3,614
Impairment of goodwill	33,000		33,244	0	0
Impairment Charge on Reclassified Assets			2,438	0	0
Change in fair value of contingent consideration liabilities			208	4,218	(206)
Segment EBITDA			1,251,399	1,116,590	1,004,980
Right to acquire equity method investment [Domain] | Mekonomen [Member]
Reconciliation of Segment Earnings Before Interest Taxes Depreciation And Amortization to Net Income Table [Line Items]
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	$ (8,000)	$ 3,000	$ (5,168)	$ 0	$ 0

Schedule of Capital Expenditure

Schedule of Capital Expenditures by Reportable Segment (Details) - USD ($) $ in Thousands	2 Months Ended	8 Months Ended	12 Months Ended
	Mar. 01, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information
Capital Expenditures	$ (3,598)	$ (24,156)	$ 250,027	$ 179,090	$ 207,074
North America
Segment Reporting Information
Capital Expenditures			129,391	95,823	91,618
Europe
Segment Reporting Information
Capital Expenditures			99,885	71,494	77,689
Specialty
Segment Reporting Information
Capital Expenditures			20,751	8,175	13,611
Discontinued Operations [Member]
Segment Reporting Information
Capital Expenditures			$ 0	$ 3,598	$ 24,156

Schedule of Assets by Reportabl

Schedule of Assets by Reportable Segment (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information
Receivables, net	$ 1,154,083	$ 1,065,617	$ 1,027,106	$ 860,549
Inventories	2,836,075		2,380,783	1,935,237
Property, plant and equipment, net	1,220,162		913,089	811,576
Equity method investments	179,169		208,404	183,467
Other unallocated assets	6,003,913		4,837,490	4,512,370
Total assets	11,393,402		9,366,872	8,303,199
North America
Segment Reporting Information
Receivables, net	411,818		379,666	351,681
Inventories	1,076,306		1,076,393	915,244
Property, plant and equipment, net	570,508		537,286	505,925
Equity method investments	16,404		336	336
Europe
Segment Reporting Information
Receivables, net	649,174		555,372	443,281
Inventories	1,410,264		964,068	718,729
Property, plant and equipment, net	562,600		293,539	247,910
Equity method investments	162,765		208,068	183,131
Specialty
Segment Reporting Information
Receivables, net	93,091		92,068	65,587
Inventories	349,505		340,322	301,264
Property, plant and equipment, net	$ 87,054		$ 82,264	$ 57,741

Segment and Geographic Inform_4

Segment and Geographic Information Schedule of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets
Revenue	$ 11,876,674	$ 9,736,909	$ 8,584,031
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Revenue	6,192,636	5,662,016	5,226,918
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Revenue	1,665,317	1,548,212	1,390,775
GERMANY
Revenues from External Customers and Long-Lived Assets
Revenue	974,514	1,744	1,227
Other countries
Revenues from External Customers and Long-Lived Assets
Revenue	$ 3,044,207	$ 2,524,937	$ 1,965,111

Schedule of Tangible Long-Lived

Schedule of Tangible Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets
Long-lived Assets	$ 1,220,162	$ 913,089	$ 811,576
UNITED STATES
Revenues from External Customers and Long-Lived Assets
Long-lived Assets	620,125	583,236	531,425
UNITED KINGDOM
Revenues from External Customers and Long-Lived Assets
Long-lived Assets	165,145	178,021	159,689
Other countries
Revenues from External Customers and Long-Lived Assets
Long-lived Assets	217,416	151,791	120,443
GERMANY
Revenues from External Customers and Long-Lived Assets
Long-lived Assets	$ 217,476	$ 41	$ 19

Selected Quarterly Data (unau_3

Selected Quarterly Data (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Line Items [Line Items]
Revenue									$ 11,876,674	$ 9,736,909	$ 8,584,031
Gross margin									4,574,857	3,799,623	3,351,703
Operating income									882,241	844,998	763,398
Income from continuing operations									487,565	536,974	456,123
Net (loss) income from discontinued operations									4,397	6,746	(7,852)
Net income									483,168	530,228	463,975
Less: net income (loss) attributable to noncontrolling interest									3,050	(3,516)	0
Net income attributable to LKQ stockholders									$ 480,118	$ 533,744	$ 463,975
Income from continuing operations									$ 1.54	$ 1.73	$ 1.47
Income from continuing operations									$ 1.55	$ 1.74	$ 1.49
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax					$ 2,000			$ 4,000
Impairment on Mekonomen equity method investment									$ 70,895	$ 0	$ 0
Impairment of goodwill	$ 33,000								$ 33,244	$ 0	$ 0
Mekonomen [Member]
Quarterly Financial Information Line Items [Line Items]
Impairment on Mekonomen equity method investment	48,000	$ 23,000
Selected Quarterly Data [Member]
Quarterly Financial Information Line Items [Line Items]
Revenue	3,002,781	3,122,378	$ 3,030,751	$ 2,720,764	2,469,855	$ 2,465,800	$ 2,458,411	2,342,843
Gross margin	1,161,809	1,197,198	1,161,879	1,053,971	947,645	956,876	965,009	930,093
Operating income	164,146	234,733	256,794	226,568	165,634	199,099	244,573	235,692
Income from continuing operations	42,456	134,480	157,866	152,763	122,870	122,381	150,914	140,809
Net (loss) income from discontinued operations	4,397	0	0	0	2,215	0	0	4,531
Net income	38,059	134,480	157,866	152,763	120,655	122,381	150,914	136,278
Less: net income (loss) attributable to noncontrolling interest	2,010	378	859	(197)	(3,516)	0	0	0
Net income attributable to LKQ stockholders	$ 36,049	$ 134,102	$ 157,007	$ 152,960	$ 124,171	$ 122,381	$ 150,914	$ 136,278
Income from continuing operations	$ 0.13	$ 0.42	$ 0.50	$ 0.49	$ 0.39	$ 0.39	$ 0.49	$ 0.45
Income from continuing operations	$ 0.13	$ 0.42	$ 0.51	$ 0.49	$ 0.40	$ 0.40	$ 0.49	$ 0.46

Condensed Consolidating Stateme

Condensed Consolidating Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Revenue		$ 11,876,674	$ 9,736,909		$ 8,584,031
Cost of goods sold		7,301,817	5,937,286		5,232,328
Gross margin		4,574,857	3,799,623		3,351,703
Selling, general and administrative expenses (1), (2)		3,352,731	2,715,407	[1]	2,359,110
Restructuring and acquisition related expenses		32,428	19,672		37,762
Impairment of goodwill	$ 33,000	33,244	0		0
Depreciation and amortization		274,213	219,546		191,433
Operating income		882,241	844,998		763,398
Other expense (income):
Interest expense		146,377	101,640		88,263
Intercompany interest (income) expense, net		0	0		0
Loss on debt extinguishment		1,350	456		26,650
Gains on foreign exchange contracts - acquisition related		0	0		(18,342)
Gains on bargain purchases		(2,418)	(3,870)		(8,207)
Other Nonoperating Income (Expense)		(6,499)	(19,855)		(2,247)
Total other expense, net		138,810	78,371		86,117
Income from continuing operations before provision for income taxes		743,431	766,627		677,281
Provision for income taxes		191,395	235,560		220,566
Equity in (losses) earnings of unconsolidated subsidiaries		(64,471)	5,907		(592)
Equity in earnings of subsidiaries		0	0		0
Net (loss) income from discontinued operations		(4,397)	(6,746)		7,852
Net income		483,168	530,228		463,975
Income from continuing operations		487,565	536,974		456,123
Less: net income (loss) attributable to noncontrolling interest		3,050	(3,516)		0
Net Income (Loss) Attributable to Parent		480,118	533,744		463,975
Parent
Condensed Financial Statements, Captions [Line Items]
Revenue		0	0		0
Cost of goods sold		0	0		0
Gross margin		0	0		0
Selling, general and administrative expenses (1), (2)		27,394	29,884		34,163
Restructuring and acquisition related expenses		0	0		0
Impairment of goodwill		0
Depreciation and amortization		137	118		132
Operating income		(27,531)	(30,002)		(34,295)
Other expense (income):
Interest expense		66,794	66,030		59,415
Intercompany interest (income) expense, net		(65,072)	(17,873)		(27,470)
Loss on debt extinguishment		1,350	456		2,894
Gains on foreign exchange contracts - acquisition related					(18,342)
Gains on bargain purchases		0	0		0
Other Nonoperating Income (Expense)		(1,082)	242		470
Total other expense, net		1,990	48,855		16,967
Income from continuing operations before provision for income taxes		(29,521)	(78,857)		(51,262)
Provision for income taxes		(18,600)	28,684		(20,498)
Equity in (losses) earnings of unconsolidated subsidiaries		0	0		(795)
Equity in earnings of subsidiaries		495,436	648,031		487,682
Net (loss) income from discontinued operations		(4,397)	(6,746)		7,852
Net income		480,118	533,744
Income from continuing operations		484,515	540,490		456,123
Less: net income (loss) attributable to noncontrolling interest		0	0
Net Income (Loss) Attributable to Parent		480,118	533,744		463,975
Guarantors
Condensed Financial Statements, Captions [Line Items]
Revenue		6,276,951	5,780,904		5,467,430
Cost of goods sold		3,783,376	3,458,304		3,313,503
Gross margin		2,493,575	2,322,600		2,153,927
Selling, general and administrative expenses (1), (2)		1,713,118	1,557,883		1,450,588
Restructuring and acquisition related expenses		3,140	7,352		21,162
Impairment of goodwill		33,244
Depreciation and amortization		99,665	96,717		94,165
Operating income		644,408	660,648		588,012
Other expense (income):
Interest expense		640	546		547
Intercompany interest (income) expense, net		40,756	(2,383)		17,124
Loss on debt extinguishment		0	0		0
Gains on foreign exchange contracts - acquisition related					0
Gains on bargain purchases		0	0		0
Other Nonoperating Income (Expense)		(15,586)	(14,323)		(3,773)
Total other expense, net		25,810	(16,160)		13,898
Income from continuing operations before provision for income taxes		618,598	676,808		574,114
Provision for income taxes		163,937	168,288		213,794
Equity in (losses) earnings of unconsolidated subsidiaries		173	0		0
Equity in earnings of subsidiaries		16,598	21,836		22,314
Net (loss) income from discontinued operations		(4,397)	(6,746)		7,852
Net income		467,035	523,610
Income from continuing operations		471,432	530,356		382,634
Less: net income (loss) attributable to noncontrolling interest		0	0
Net Income (Loss) Attributable to Parent		467,035	523,610		390,486
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Revenue		5,766,958	4,116,161		3,301,503
Cost of goods sold		3,685,676	2,639,138		2,103,727
Gross margin		2,081,282	1,477,023		1,197,776
Selling, general and administrative expenses (1), (2)		1,612,219	1,127,640		874,359
Restructuring and acquisition related expenses		29,288	12,320		16,600
Impairment of goodwill		0
Depreciation and amortization		174,411	122,711		97,136
Operating income		265,364	214,352		209,681
Other expense (income):
Interest expense		78,943	35,064		28,301
Intercompany interest (income) expense, net		24,316	20,256		10,346
Loss on debt extinguishment		0	0		23,756
Gains on foreign exchange contracts - acquisition related					0
Gains on bargain purchases		(2,418)	(3,870)		(8,207)
Other Nonoperating Income (Expense)		10,169	(5,774)		1,056
Total other expense, net		111,010	45,676		55,252
Income from continuing operations before provision for income taxes		154,354	168,676		154,429
Provision for income taxes		46,058	38,588		27,270
Equity in (losses) earnings of unconsolidated subsidiaries		(64,644)	5,907		203
Equity in earnings of subsidiaries		0	0		0
Net (loss) income from discontinued operations		0	2,050		3,285
Net income		43,652	138,045
Income from continuing operations		43,652	135,995		127,362
Less: net income (loss) attributable to noncontrolling interest		3,050	(3,516)
Net Income (Loss) Attributable to Parent		40,602	141,561		130,647
Eliminations
Condensed Financial Statements, Captions [Line Items]
Revenue		(167,235)	(160,156)		(184,902)
Cost of goods sold		(167,235)	(160,156)		(184,902)
Gross margin		0	0		0
Selling, general and administrative expenses (1), (2)		0	0		0
Restructuring and acquisition related expenses		0	0		0
Impairment of goodwill		0
Depreciation and amortization		0	0		0
Operating income		0	0		0
Other expense (income):
Interest expense		0	0		0
Intercompany interest (income) expense, net		0	0		0
Loss on debt extinguishment		0	0		0
Gains on foreign exchange contracts - acquisition related					0
Gains on bargain purchases		0	0		0
Other Nonoperating Income (Expense)		0	0		0
Total other expense, net		0	0		0
Income from continuing operations before provision for income taxes		0	0		0
Provision for income taxes		0	0		0
Equity in (losses) earnings of unconsolidated subsidiaries		0	0		0
Equity in earnings of subsidiaries		(512,034)	(669,867)		(509,996)
Net (loss) income from discontinued operations		4,397	4,696		(11,137)
Net income		(507,637)	(665,171)
Income from continuing operations		(512,034)	(669,867)		(509,996)
Less: net income (loss) attributable to noncontrolling interest		0	0
Net Income (Loss) Attributable to Parent		$ (507,637)	$ (665,171)		$ (521,133)
[1]	(1) Selling, general and administrative expenses contain facility and warehouse expenses and distribution expenses that were previously shown separately.

Condensed Consolidating State_2

Condensed Consolidating Statements of Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items]
Net income	$ 483,168	$ 530,228	$ 463,975
Less: net income (loss) attributable to noncontrolling interest	3,050	(3,516)	0
Net income attributable to LKQ stockholders	480,118	533,744	463,975
Other comprehensive income (loss):
Foreign currency translation, net of tax	(108,523)	200,596	(175,639)
Net change in unrealized gains/losses on cash flow hedges, net of tax	350	3,447	9,023
Net change in unrealized gains/losses on pension plans, net of tax	697	(6,035)	4,911
Net change in other comprehensive loss from unconsolidated subsidiaries	2,343	1,309	0
Other comprehensive (loss) income	(109,819)	196,699	(161,705)
Comprehensive income	373,349	726,927	302,270
Less: comprehensive income (loss) attributable to noncontrolling interest	3,050	(3,516)	0
Comprehensive income attributable to LKQ stockholders	370,299	730,443	302,270
Parent
Condensed Financial Statements, Captions [Line Items]
Net income	480,118	533,744
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	480,118	533,744	463,975
Other comprehensive income (loss):
Foreign currency translation, net of tax	(108,523)	200,596	(175,639)
Net change in unrealized gains/losses on cash flow hedges, net of tax	350	3,447	9,023
Net change in unrealized gains/losses on pension plans, net of tax	697	(6,035)	4,911
Net change in other comprehensive loss from unconsolidated subsidiaries	2,343	1,309
Other comprehensive (loss) income	(109,819)	196,699	(161,705)
Comprehensive income	370,299	730,443
Less: comprehensive income (loss) attributable to noncontrolling interest	0
Comprehensive income attributable to LKQ stockholders	370,299	730,443	302,270
Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	467,035	523,610
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	467,035	523,610	390,486
Other comprehensive income (loss):
Foreign currency translation, net of tax	(8,628)	16,743	(48,914)
Net change in unrealized gains/losses on cash flow hedges, net of tax	0	(133)	133
Net change in unrealized gains/losses on pension plans, net of tax	1,266	(3,254)	3,962
Net change in other comprehensive loss from unconsolidated subsidiaries	0	0
Other comprehensive (loss) income	(7,362)	13,356	(44,819)
Comprehensive income	459,673	536,966
Less: comprehensive income (loss) attributable to noncontrolling interest	0
Comprehensive income attributable to LKQ stockholders	459,673	536,966	345,667
Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income	43,652	138,045
Less: net income (loss) attributable to noncontrolling interest	3,050	(3,516)
Net income attributable to LKQ stockholders	40,602	141,561	130,647
Other comprehensive income (loss):
Foreign currency translation, net of tax	(75,462)	206,049	(177,911)
Net change in unrealized gains/losses on cash flow hedges, net of tax	0	0	389
Net change in unrealized gains/losses on pension plans, net of tax	(569)	(2,781)	1,061
Net change in other comprehensive loss from unconsolidated subsidiaries	2,343	1,309
Other comprehensive (loss) income	(78,374)	201,959	(176,461)
Comprehensive income	(34,722)	340,004
Less: comprehensive income (loss) attributable to noncontrolling interest	3,050	(3,516)
Comprehensive income attributable to LKQ stockholders	(37,772)	343,520	(45,814)
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income	(507,637)	(665,171)
Less: net income (loss) attributable to noncontrolling interest	0	0
Net income attributable to LKQ stockholders	(507,637)	(665,171)	(521,133)
Other comprehensive income (loss):
Foreign currency translation, net of tax	84,090	(222,792)	226,825
Net change in unrealized gains/losses on cash flow hedges, net of tax	0	133	(522)
Net change in unrealized gains/losses on pension plans, net of tax	(697)	6,035	(5,023)
Net change in other comprehensive loss from unconsolidated subsidiaries	(2,343)	(1,309)
Other comprehensive (loss) income	85,736	(215,315)	221,280
Comprehensive income	(421,901)	(880,486)
Less: comprehensive income (loss) attributable to noncontrolling interest	0
Comprehensive income attributable to LKQ stockholders	$ (421,901)	$ (880,486)	$ (299,853)

Condensed Consolidating Balance

Condensed Consolidating Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 331,761		$ 279,766	$ 227,400
Receivables, net	1,154,083	$ 1,065,617	1,027,106	860,549
Intercompany receivables, net	0		0
Inventories	2,836,075		2,380,783	1,935,237
Prepaid expenses and other current assets	199,030	178,987	134,479
Total current assets	4,520,949		3,822,134
Property, plant and equipment, net	1,220,162		913,089	811,576
Intangible assets:
Goodwill	4,381,458		3,536,511	3,054,769	$ 2,319,246
Other intangibles, net	928,752		743,769
Investment in subsidiaries	0		0
Intercompany notes receivable	0		0
Equity method investments	179,169		208,404	183,467
Other assets	162,912		142,965
Total assets	11,393,402		9,366,872	8,303,199
Current liabilities:
Accounts payable	942,398		788,613
Intercompany payables, net	0		0
Accrued expenses:
Accrued payroll-related liabilities	172,005		143,424
Other accrued expenses	288,425		218,600
Refund liability	104,585	$ 83,019	0
Other current liabilities	61,109		45,727
Current portion of long-term obligations	121,826		126,360
Total current liabilities	1,690,348		1,322,724
Long-term obligations, excluding current portion	4,188,674		3,277,620
Intercompany notes payable	0		0
Deferred income taxes	311,434		252,359
Other noncurrent liabilities	364,194		307,516
Total Company stockholders' equity	4,782,298		4,198,169
Noncontrolling interest	56,454		8,484
Total stockholders' equity	4,838,752		4,206,653	3,442,949	$ 3,114,682
Total liabilities and stockholders’ equity	11,393,402		9,366,872
Parent
Current assets:
Cash and cash equivalents	25,633		34,360	33,030
Receivables, net	310		0
Intercompany receivables, net	6,978		2,669
Inventories	0		0
Prepaid expenses and other current assets	18,611		34,136
Total current assets	51,532		71,165
Property, plant and equipment, net	1,547		910
Intangible assets:
Goodwill	0		0
Other intangibles, net	260		0
Investment in subsidiaries	5,224,006		5,952,687
Intercompany notes receivable	1,220,582		1,156,550
Equity method investments	0		0
Other assets	70,283		70,590
Total assets	6,568,210		7,251,902
Current liabilities:
Accounts payable	2,454		5,742
Intercompany payables, net	0		0
Accrued expenses:
Accrued payroll-related liabilities	6,652		9,448
Other accrued expenses	5,454		5,219
Refund liability	0
Other current liabilities	283		282
Current portion of long-term obligations	8,459		16,468
Total current liabilities	23,302		37,159
Long-term obligations, excluding current portion	1,628,677		2,095,826
Intercompany notes payable	0		750,000
Deferred income taxes	8,045		12,402
Other noncurrent liabilities	125,888		158,346
Total Company stockholders' equity	4,782,298		4,198,169
Noncontrolling interest	0		0
Total stockholders' equity	4,782,298		4,198,169
Total liabilities and stockholders’ equity	6,568,210		7,251,902
Guarantors
Current assets:
Cash and cash equivalents	29,285		35,131	35,360
Receivables, net	316,726		290,958
Intercompany receivables, net	0		3,010
Inventories	1,343,612		1,334,766
Prepaid expenses and other current assets	99,356		44,849
Total current assets	1,788,979		1,708,714
Property, plant and equipment, net	600,054		563,262
Intangible assets:
Goodwill	1,973,364		2,010,209
Other intangibles, net	272,451		291,036
Investment in subsidiaries	111,826		102,931
Intercompany notes receivable	10,515		782,638
Equity method investments	16,404		336
Other assets	40,548		33,597
Total assets	4,814,141		5,492,723
Current liabilities:
Accounts payable	343,116		340,951
Intercompany payables, net	12,880		230
Accrued expenses:
Accrued payroll-related liabilities	70,267		65,811
Other accrued expenses	105,672		95,900
Refund liability	50,899
Other current liabilities	17,860		27,066
Current portion of long-term obligations	2,932		1,912
Total current liabilities	603,626		531,870
Long-term obligations, excluding current portion	13,532		7,372
Intercompany notes payable	597,283		677,708
Deferred income taxes	135,355		116,021
Other noncurrent liabilities	99,147		101,189
Total Company stockholders' equity	3,365,198		4,058,563
Noncontrolling interest	0		0
Total stockholders' equity	3,365,198		4,058,563
Total liabilities and stockholders’ equity	4,814,141		5,492,723
Non-Guarantors
Current assets:
Cash and cash equivalents	276,843		210,275	159,010
Receivables, net	837,047		736,148
Intercompany receivables, net	12,880		230
Inventories	1,492,463		1,046,017
Prepaid expenses and other current assets	81,063		55,494
Total current assets	2,700,296		2,048,164
Property, plant and equipment, net	618,561		348,917
Intangible assets:
Goodwill	2,408,094		1,526,302
Other intangibles, net	656,041		452,733
Investment in subsidiaries	0		0
Intercompany notes receivable	0		0
Equity method investments	162,765		208,068
Other assets	52,081		38,778
Total assets	6,597,838		4,622,962
Current liabilities:
Accounts payable	596,828		441,920
Intercompany payables, net	6,978		5,679
Accrued expenses:
Accrued payroll-related liabilities	95,086		68,165
Other accrued expenses	177,299		117,481
Refund liability	53,686
Other current liabilities	42,966		18,379
Current portion of long-term obligations	110,435		107,980
Total current liabilities	1,083,278		759,604
Long-term obligations, excluding current portion	2,546,465		1,174,422
Intercompany notes payable	633,814		511,480
Deferred income taxes	168,034		123,936
Other noncurrent liabilities	139,159		47,981
Total Company stockholders' equity	1,970,634		1,997,055
Noncontrolling interest	56,454		8,484
Total stockholders' equity	2,027,088		2,005,539
Total liabilities and stockholders’ equity	6,597,838		4,622,962
Eliminations
Current assets:
Cash and cash equivalents	0		0	$ 0
Receivables, net	0		0
Intercompany receivables, net	(19,858)		(5,909)
Inventories	0		0
Prepaid expenses and other current assets	0		0
Total current assets	(19,858)		(5,909)
Property, plant and equipment, net	0		0
Intangible assets:
Goodwill	0		0
Other intangibles, net	0		0
Investment in subsidiaries	(5,335,832)		(6,055,618)
Intercompany notes receivable	(1,231,097)		(1,939,188)
Equity method investments	0		0
Other assets	0		0
Total assets	(6,586,787)		(8,000,715)
Current liabilities:
Accounts payable	0		0
Intercompany payables, net	(19,858)		(5,909)
Accrued expenses:
Accrued payroll-related liabilities	0		0
Other accrued expenses	0		0
Refund liability	0
Other current liabilities	0		0
Current portion of long-term obligations	0		0
Total current liabilities	(19,858)		(5,909)
Long-term obligations, excluding current portion	0		0
Intercompany notes payable	(1,231,097)		(1,939,188)
Deferred income taxes	0		0
Other noncurrent liabilities	0		0
Total Company stockholders' equity	(5,335,832)		(6,055,618)
Noncontrolling interest	0		0
Total stockholders' equity	(5,335,832)		(6,055,618)
Total liabilities and stockholders’ equity	$ (6,586,787)		$ (8,000,715)

Condensed Consolidating State_3

Condensed Consolidating Statements of Cash Flows (Details) - USD ($) $ in Thousands	2 Months Ended		8 Months Ended	12 Months Ended
	Feb. 22, 2019	Mar. 01, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities				$ 710,739	$ 518,900	$ 635,014
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment		$ 3,598	$ 24,156	(250,027)	(179,090)	(207,074)
Proceeds from Disposal of Property, Plant, and Equipment				27,659	8,707	3,510
Investment and intercompany note activity with subsidiaries				0	0	0
Proceeds from investment in subsidiary, distribution, return of capital				0
Acquisitions, net of cash and restricted cash acquired				(1,214,995)	(513,088)	(1,349,339)
Payments to Acquire Equity Method Investments		0	4,400	(60,300)	(7,664)	(185,671)
Proceeds from Divestiture of Businesses, Net of Cash Divested					301,297	10,304
Receipts of deferred purchase price on receivables under factoring arrangements				36,991	0	0
Proceeds from foreign exchange contracts				0	0	18,342
Other investing activities, net				1,733	5,243	0
Net cash used in investing activities				(1,458,939)	(384,595)	(1,709,928)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options				5,303	7,470	7,963
Taxes paid related to net share settlements of stock-based compensation awards				(5,567)	(5,525)	(4,438)
Debt issuance costs				(21,128)	(4,267)	(16,554)
Proceeds from issuance of Euro Notes (2026/28)				1,232,100	0	0
Payments for Repurchase of Common Stock	$ 46,000			(60,000)	0	0
Borrowings under revolving credit facilities				1,667,325	839,171	2,636,596
Repayments under revolving credit facilities				(1,528,970)	(946,477)	(1,748,664)
Repayments under term loans				(354,800)	(27,884)	(255,792)
Borrowings under receivables securitization facility				10,120	11,245	106,400
(Repayments) borrowings of other debt, net				(11,730)	19,706	(31,156)
Repayment of Rhiag debt and related payments				0	0	(543,347)
Other financing activities, net				5,350	5,239	(1,436)
Investment and intercompany note activity with parent				0	0	0
Dividends				0	0	0
Net cash provided by (used in) financing activities				882,995	(112,567)	1,225,737
Effect of exchange rate changes on cash, cash equivalents and restricted cash				(77,311)	23,512	(3,704)
Net increase in cash, cash equivalents and restricted cash				57,484	45,250	147,119
Cash and cash equivalents of continuing operations, beginning of period			227,400		279,766	227,400	$ 87,397
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations			234,516	337,250	279,766	234,516	87,397
Add: Cash, cash equivalents and restricted cash of discontinued operations, beginning of period	$ 0	(7,116)		0	(7,116)	0
Cash and cash equivalents, end of period			227,400	331,761	279,766	227,400
Repayments under receivables securitization facility				(120)	(11,245)	(69,400)
Repayments of assumed debt and notes issued from acquisitions				(54,888)	0	0
Proceeds from issuance of Euro Notes (2024)				0	0	563,450
Borrowings under term loans				0	0	582,115
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents			227,400	337,250	279,766	227,400
Parent
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities				481,138	243,011	308,299
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment				(848)	(648)	(36)
Proceeds from Disposal of Property, Plant, and Equipment				0	0	3
Investment and intercompany note activity with subsidiaries				(97,261)	57,735	(1,720,732)
Proceeds from investment in subsidiary, distribution, return of capital				143,524
Acquisitions, net of cash and restricted cash acquired				0	0	0
Payments to Acquire Equity Method Investments				0	0	0
Proceeds from Divestiture of Businesses, Net of Cash Divested					0	0
Receipts of deferred purchase price on receivables under factoring arrangements				0	0	0
Proceeds from foreign exchange contracts						18,342
Other investing activities, net				887	0
Net cash used in investing activities				46,302	57,087	(1,702,423)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options				5,303	7,470	7,963
Taxes paid related to net share settlements of stock-based compensation awards				(5,567)	(5,525)	(4,438)
Debt issuance costs				(5,434)	(4,267)	(7,104)
Proceeds from issuance of Euro Notes (2026/28)				0
Payments for Repurchase of Common Stock				60,000
Borrowings under revolving credit facilities				765,632	558,000	1,744,408
Repayments under revolving credit facilities				(884,863)	(824,862)	(654,000)
Repayments under term loans				(354,800)	(27,884)	(10,898)
Borrowings under receivables securitization facility				0	0	0
(Repayments) borrowings of other debt, net				(385)	(1,700)	653
Repayment of Rhiag debt and related payments						0
Other financing activities, net				3,947	0	0
Investment and intercompany note activity with parent				0	0	0
Dividends				0	0	0
Net cash provided by (used in) financing activities				(536,167)	(298,768)	1,409,538
Effect of exchange rate changes on cash, cash equivalents and restricted cash				0	0	0
Net increase in cash, cash equivalents and restricted cash				(8,727)	1,330	15,414
Cash and cash equivalents of continuing operations, beginning of period			33,030			33,030	17,616
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations			33,030			33,030
Add: Cash, cash equivalents and restricted cash of discontinued operations, beginning of period		0			0
Cash and cash equivalents, end of period			33,030	25,633	34,360	33,030
Repayments under receivables securitization facility				0	0	0
Repayments of assumed debt and notes issued from acquisitions				0
Proceeds from issuance of Euro Notes (2024)						0
Borrowings under term loans						332,954
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents				25,633	34,360
Guarantors
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities				277,595	186,459	149,785
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment				(136,033)	(87,102)	(120,761)
Proceeds from Disposal of Property, Plant, and Equipment				22,393	6,490	1,953
Investment and intercompany note activity with subsidiaries				0	0	0
Proceeds from investment in subsidiary, distribution, return of capital				0
Acquisitions, net of cash and restricted cash acquired				(8,217)	(335,582)	(685,278)
Payments to Acquire Equity Method Investments				(12,216)	(2,750)	(4,400)
Proceeds from Divestiture of Businesses, Net of Cash Divested					305,740	0
Receipts of deferred purchase price on receivables under factoring arrangements				317,091	294,925	389,533
Proceeds from foreign exchange contracts						0
Other investing activities, net				180	0
Net cash used in investing activities				183,198	181,721	(418,953)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options				0	0	0
Taxes paid related to net share settlements of stock-based compensation awards				0	0	0
Debt issuance costs				0	0	0
Proceeds from issuance of Euro Notes (2026/28)				0
Payments for Repurchase of Common Stock				0
Borrowings under revolving credit facilities				0	0	0
Repayments under revolving credit facilities				0	0	0
Repayments under term loans				0	0	0
Borrowings under receivables securitization facility				0	0	0
(Repayments) borrowings of other debt, net				(3,636)	(1,318)	(2,935)
Repayment of Rhiag debt and related payments						0
Other financing activities, net				0	(1,336)	(1,436)
Investment and intercompany note activity with parent				(68,435)	(65,498)	608,270
Dividends				(392,883)	(301,112)	(312,497)
Net cash provided by (used in) financing activities				(464,954)	(369,264)	291,402
Effect of exchange rate changes on cash, cash equivalents and restricted cash				(1,685)	706	(157)
Net increase in cash, cash equivalents and restricted cash				(5,846)	(378)	22,077
Cash and cash equivalents of continuing operations, beginning of period			35,360			35,360	13,432
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations			35,509			35,509
Add: Cash, cash equivalents and restricted cash of discontinued operations, beginning of period		(149)			(149)
Cash and cash equivalents, end of period			35,360	29,285	35,131	35,360
Repayments under receivables securitization facility				0	0	0
Repayments of assumed debt and notes issued from acquisitions				0
Proceeds from issuance of Euro Notes (2024)						0
Borrowings under term loans						0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents				29,285	35,131
Non-Guarantors
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities				111,213	95,617	99,894
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment				(113,146)	(91,340)	(86,277)
Proceeds from Disposal of Property, Plant, and Equipment				5,266	2,217	1,554
Investment and intercompany note activity with subsidiaries				0	0	0
Proceeds from investment in subsidiary, distribution, return of capital				0
Acquisitions, net of cash and restricted cash acquired				(1,206,778)	(177,506)	(664,061)
Payments to Acquire Equity Method Investments				(48,084)	(4,914)	(181,271)
Proceeds from Divestiture of Businesses, Net of Cash Divested					(4,443)	10,304
Receipts of deferred purchase price on receivables under factoring arrangements				36,991	0	0
Proceeds from foreign exchange contracts						0
Other investing activities, net				666	5,243
Net cash used in investing activities				(1,325,085)	(270,743)	(919,751)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options				0	0	0
Taxes paid related to net share settlements of stock-based compensation awards				0	0	0
Debt issuance costs				(15,694)	0	(9,450)
Proceeds from issuance of Euro Notes (2026/28)				1,232,100
Payments for Repurchase of Common Stock				0
Borrowings under revolving credit facilities				901,693	281,171	892,188
Repayments under revolving credit facilities				(644,107)	(121,615)	(1,094,664)
Repayments under term loans				0	0	(244,894)
Borrowings under receivables securitization facility				10,120	11,245	106,400
(Repayments) borrowings of other debt, net				(7,709)	22,724	(28,874)
Repayment of Rhiag debt and related payments						(543,347)
Other financing activities, net				1,403	6,575	0
Investment and intercompany note activity with parent				165,696	7,763	1,112,462
Dividends				(226,939)	0	0
Net cash provided by (used in) financing activities				1,361,555	196,618	933,032
Effect of exchange rate changes on cash, cash equivalents and restricted cash				(75,626)	22,806	(3,547)
Net increase in cash, cash equivalents and restricted cash				72,057	44,298	109,628
Cash and cash equivalents of continuing operations, beginning of period			159,010			159,010	56,349
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations			165,977			165,977
Add: Cash, cash equivalents and restricted cash of discontinued operations, beginning of period		(6,967)			(6,967)
Cash and cash equivalents, end of period			159,010	276,843	210,275	159,010
Repayments under receivables securitization facility				(120)	(11,245)	(69,400)
Repayments of assumed debt and notes issued from acquisitions				(54,888)
Proceeds from issuance of Euro Notes (2024)						563,450
Borrowings under term loans						249,161
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents				282,332	210,275
Eliminations
CASH FLOWS FROM OPERATING ACTIVITIES:
Net cash provided by operating activities				(159,207)	(6,187)	77,036
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment				0	0	0
Proceeds from Disposal of Property, Plant, and Equipment				0	0	0
Investment and intercompany note activity with subsidiaries				97,261	(57,735)	1,720,732
Proceeds from investment in subsidiary, distribution, return of capital				(143,524)
Acquisitions, net of cash and restricted cash acquired				0	0	0
Payments to Acquire Equity Method Investments				0	0	0
Proceeds from Divestiture of Businesses, Net of Cash Divested					0	0
Receipts of deferred purchase price on receivables under factoring arrangements				(317,091)	(294,925)	(389,533)
Proceeds from foreign exchange contracts						0
Other investing activities, net				0	0
Net cash used in investing activities				(363,354)	(352,660)	1,331,199
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of stock options				0	0	0
Taxes paid related to net share settlements of stock-based compensation awards				0	0	0
Debt issuance costs				0	0	0
Proceeds from issuance of Euro Notes (2026/28)				0
Payments for Repurchase of Common Stock				0
Borrowings under revolving credit facilities				0	0	0
Repayments under revolving credit facilities				0	0	0
Repayments under term loans				0	0	0
Borrowings under receivables securitization facility				0	0	0
(Repayments) borrowings of other debt, net				0	0	0
Repayment of Rhiag debt and related payments						0
Other financing activities, net				0	0	0
Investment and intercompany note activity with parent				(97,261)	57,735	(1,720,732)
Dividends				619,822	301,112	312,497
Net cash provided by (used in) financing activities				522,561	358,847	(1,408,235)
Effect of exchange rate changes on cash, cash equivalents and restricted cash				0	0	0
Net increase in cash, cash equivalents and restricted cash				0	0	0
Cash and cash equivalents of continuing operations, beginning of period			0			0	$ 0
Cash and Cash Equivalents, at Carrying Value, Including Discontinued Operations			0			0
Add: Cash, cash equivalents and restricted cash of discontinued operations, beginning of period		$ 0			0
Cash and cash equivalents, end of period			$ 0	0	0	0
Repayments under receivables securitization facility				0	0	0
Repayments of assumed debt and notes issued from acquisitions				0
Proceeds from issuance of Euro Notes (2024)						0
Borrowings under term loans						$ 0
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents				$ 0	$ 0

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	$ 57,207	$ 57,609	$ 45,608	$ 24,583
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense	13,970	15,387	13,280
Valuation Allowances and Reserves, Deductions	(15,945)	(13,012)	(21,829)
Valuation Allowances and Reserves, Reserves of Businesses Acquired	$ 1,573	9,626	29,574
Allowance For Estimated Returns, Discounts, And Allowances [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance		42,325	38,345	$ 32,774
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense		1,885,517	1,670,911
Valuation Allowances and Reserves, Deductions		(1,884,250)	(1,673,040)
Valuation Allowances and Reserves, Reserves of Businesses Acquired		$ 2,713	$ 7,700