Albemarle (ALB) 10-K 28 Feb 18 2017 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Billions	12 Months Ended
	Dec. 31, 2017	Feb. 20, 2018	Jun. 30, 2017
Document And Entity Information [Abstract] [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	FY
Trading Symbol	ALB
Entity Registrant Name	ALBEMARLE CORP
Entity Central Index Key	915,913
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		110,638,449
Entity Public Float			$ 11.7

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement [Abstract]
Net sales	$ 3,071,976	$ 2,677,203	$ 2,826,429
Cost of goods sold	1,961,996	1,706,627	1,966,196
Gross profit	1,109,980	970,576	860,233
Selling, general and administrative expenses	437,901	380,464	300,440
Research and development expenses	84,330	80,475	89,187
Restructuring and other, net	0	0	(6,804)
Gain on sales of businesses, net	0	(122,298)	0
Acquisition and integration related costs	0	57,384	132,299
Operating profit	587,749	574,551	345,111
Interest and financing expenses	(115,350)	(65,181)	(81,650)
Other (expenses) income, net	(25,601)	5,894	47,283
Income from continuing operations before income taxes and equity in net income of unconsolidated investments	446,798	515,264	310,744
Income tax expense	431,817	96,263	11,134
Income from continuing operations before equity in net income of unconsolidated investments	14,981	419,001	299,610
Equity in net income of unconsolidated investments (net of tax)	84,487	59,637	27,978
Net income from continuing operations	99,468	478,638	327,588
Income from discontinued operations (net of tax)	0	202,131	32,476
Net income	99,468	680,769	360,064
Net income attributable to noncontrolling interests	(44,618)	(37,094)	(25,158)
Net income attributable to Albemarle Corporation	$ 54,850	$ 643,675	$ 334,906
Basic earnings per share:
Basic earnings per share from continuing operations (in dollars per share)	$ 0.49	$ 3.93	$ 2.72
Basic earnings per share from discontinued operations (in dollars per share)	0	1.80	0.29
Basic earnings per share (in dollars per share)	0.49	5.73	3.01
Diluted earnings per share:
Diluted earnings per share from continuing operations (in dollars per share)	0.49	3.90	2.71
Diluted earnings per share from discontinued operations (in dollars per share)	0	1.78	0.29
Diluted earnings per share (in dollars per share)	$ 0.49	$ 5.68	$ 3
Weighted-average common shares outstanding—basic (in shares)	110,914	112,379	111,182
Weighted-average common shares outstanding—diluted (in shares)	112,380	113,239	111,556
Cash dividends declared per share of common stock (in dollars per share)	$ 1.28	$ 1.22	$ 1.16

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 99,468	$ 680,769	$ 360,064
Other comprehensive income (loss), net of tax:
Foreign currency translation	227,439	(20,825)	(412,970)
Pension and postretirement benefits	(97)	834	(758)
Net investment hedge	(41,827)	26,133	50,861
Interest rate swap	2,116	2,116	2,101
Total other comprehensive income (loss), net of tax	187,631	8,258	(360,766)
Comprehensive income (loss)	287,099	689,027	(702)
Comprehensive income attributable to noncontrolling interests	(45,505)	(36,477)	(23,267)
Comprehensive income (loss) attributable to Albemarle Corporation	$ 241,594	$ 652,550	$ (23,969)

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 1,137,303	$ 2,269,756
Trade accounts receivable, less allowance for doubtful accounts (2017—$10,425; 2016—$15,312)	534,326	486,035
Other accounts receivable	37,937	41,985
Inventories	592,781	450,263
Other current assets	136,064	58,579
Assets held for sale	39,152	0
Total current assets	2,477,563	3,306,618
Property, plant and equipment, at cost	4,124,335	3,910,522
Less accumulated depreciation and amortization	1,631,025	1,550,382
Net property, plant and equipment	2,493,310	2,360,140
Investments	534,064	457,533
Noncurrent assets held for sale	139,813	0
Other assets	74,164	142,320
Goodwill	1,610,355	1,540,032
Other intangibles, net of amortization	421,503	354,564
Total assets	7,750,772	8,161,207
Current liabilities:
Accounts payable	418,537	281,874
Accrued expenses	268,336	322,165
Current portion of long-term debt	422,012	247,544
Dividends payable	35,165	34,104
Liabilities held for sale	1,938	0
Income taxes payable	54,937	254,416
Total current liabilities	1,200,925	1,140,103
Long-term debt	1,415,360	2,121,718
Postretirement benefits	52,003	50,538
Pension benefits	294,611	298,695
Noncurrent liabilities held for sale	614	0
Other noncurrent liabilities	599,174	194,810
Deferred income taxes	370,389	412,739
Commitments and contingencies
Albemarle Corporation shareholders’ equity:
Common stock, $.01 par value (authorized 150,000 shares), issued and outstanding — 110,547 in 2017 and 112,524 in 2016	1,105	1,125
Additional paid-in capital	1,863,949	2,084,418
Accumulated other comprehensive loss	(225,668)	(412,412)
Retained earnings	2,035,163	2,121,931
Total Albemarle Corporation shareholders’ equity	3,674,549	3,795,062
Noncontrolling interests	143,147	147,542
Total equity	3,817,696	3,942,604
Total liabilities and equity	$ 7,750,772	$ 8,161,207

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Trade accounts receivables, allowance for doubtful accounts	$ 10,425	$ 15,312
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	110,547,000	112,524,000
Common stock, shares outstanding	110,547,000	112,524,000

CONSOLIDATED STATEMENTS OF CHAN

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings	Total Albemarle Shareholders’ Equity	Noncontrolling Interests
Beginning balance (in shares) at Dec. 31, 2014		78,030,524
Beginning balance at Dec. 31, 2014	$ 1,488,635	$ 780	$ 10,447	$ (62,413)	$ 1,410,651	$ 1,359,465	$ 129,170
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	360,064				334,906	334,906	25,158
Other comprehensive income (loss)	(360,766)			(358,875)		(358,875)	(1,891)
Cash dividends declared	(153,436)				(130,150)	(130,150)	(23,286)
Stock-based compensation and other	13,696		13,696			13,696
Exercise of stock options (in shares)		18,000
Exercise of stock options	517	$ 0	517			517
Tax deficiency related to stock plans	(167)		(167)			(167)
Issuance of common stock, net (in shares)		85,900
Issuance of common stock, net	0	$ 1	(1)			0
Acquisition of Rockwood (in shares)		34,113,064
Acquisition of Rockwood	2,054,132	$ 341	2,036,209			2,036,550	17,582
Noncontrolling interest assumed in acquisition of Shanghai Chemetall	4,843					0	4,843
Purchase of noncontrolling interest	(4,655)					0	(4,655)
Shares withheld for withholding taxes associated with common stock issuances (in shares)		(28,137)
Shares withheld for withholding taxes associated with common stock issuances	(1,550)	$ 0	(1,550)			(1,550)
Ending balance (in shares) at Dec. 31, 2015		112,219,351
Ending balance at Dec. 31, 2015	3,401,313	$ 1,122	2,059,151	(421,288)	1,615,407	3,254,392	146,921
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	680,769				643,675	643,675	37,094
Other comprehensive income (loss)	8,258			8,876		8,876	(618)
Cash dividends declared	(173,006)				(137,151)	(137,151)	(35,855)
Stock-based compensation and other	16,251		16,251			16,251
Exercise of stock options (in shares)		212,343
Exercise of stock options	9,402	$ 2	9,400			9,402
Tax benefit related to stock plans	1,811		1,811			1,811
Issuance of common stock, net (in shares)		131,596
Issuance of common stock, net	0	$ 1	(1)			0
Shares withheld for withholding taxes associated with common stock issuances (in shares)		(39,500)
Shares withheld for withholding taxes associated with common stock issuances	(2,194)	$ 0	(2,194)			(2,194)
Ending balance (in shares) at Dec. 31, 2016		112,523,790
Ending balance at Dec. 31, 2016	3,942,604	$ 1,125	2,084,418	(412,412)	2,121,931	3,795,062	147,542
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	99,468				54,850	54,850	44,618
Other comprehensive income (loss)	187,631			186,744		186,744	887
Cash dividends declared	(178,374)				(141,618)	(141,618)	(36,756)
Stock-based compensation and other	$ 16,505		16,505			16,505
Exercise of stock options (in shares)	210,432	210,432
Exercise of stock options	$ 8,238	$ 2	8,236			8,238
Shares repurchased (in shares)		(2,341,083)
Shares repurchased	(250,000)	$ (23)	(249,977)			(250,000)
Issuance of common stock, net (in shares)		243,024
Issuance of common stock, net	0	$ 2	(2)			0
Termination of Tianqi Lithium Corporation option agreement	0		13,144			13,144	(13,144)
Shares withheld for withholding taxes associated with common stock issuances (in shares)		(89,489)
Shares withheld for withholding taxes associated with common stock issuances	(8,376)	$ (1)	(8,375)			(8,376)
Ending balance (in shares) at Dec. 31, 2017		110,546,674
Ending balance at Dec. 31, 2017	$ 3,817,696	$ 1,105	$ 1,863,949	$ (225,668)	$ 2,035,163	$ 3,674,549	$ 143,147

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 2,269,756	$ 213,734	$ 2,489,768
Cash flows from operating activities:
Net income	99,468	680,769	360,064
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	196,928	226,169	260,076
Gain associated with restructuring and other	0	0	(6,804)
Gain on acquisition	(6,221)	0	0
Gain on sales of businesses, net	0	(510,278)	0
Stock-based compensation	19,404	17,031	15,188
Equity in net income of unconsolidated investments (net of tax)	(84,487)	(61,534)	(30,999)
Dividends received from unconsolidated investments and nonmarketable securities	39,386	43,759	59,912
Pension and postretirement (benefit) expense	(12,436)	41,546	(38,817)
Pension and postretirement contributions	(13,341)	(20,068)	(21,613)
Unrealized gain on investments in marketable securities	(3,135)	(3,655)	(1,239)
Loss on early extinguishment of debt	52,801	1,921	5,353
Deferred income taxes	(41,941)	21,121	(136,298)
Changes in current assets and liabilities, net of effects of acquisitions and divestitures:
(Increase) in accounts receivable	(74,545)	(42,816)	(8,788)
(Increase) decrease in inventories	(101,545)	25,974	27,649
(Increase) decrease in other current assets	(213)	1,808	12,756
Increase in accounts payable	53,421	43,953	23,745
(Decrease) increase in accrued expenses and income taxes payable	(269,381)	210,276	(96,896)
Other, net	449,816	59,548	(62,479)
Net cash provided by operating activities	303,979	735,524	360,810
Cash flows from investing activities:
Acquisition of Rockwood, net of cash acquired	0	0	(2,051,645)
Other acquisitions, net of cash acquired	(44,367)	(126,747)	(48,845)
Cash payments related to acquisitions and other	0	(81,987)	0
Capital expenditures	(317,703)	(196,654)	(227,649)
Decrease in restricted cash	0	0	57,550
Cash proceeds from divestitures, net	6,857	3,325,571	8,883
Return of capital from unconsolidated investment	0	0	98,000
(Investments in) sales of marketable securities, net	(275)	305	998
Repayments from joint ventures	1,250	0	2,156
Investments in equity and other corporate investments	(3,565)	0	0
Net cash (used in) provided by investing activities	(357,803)	2,920,488	(2,160,552)
Cash flows from financing activities:
Proceeds from borrowings of other long-term debt	27,000	0	2,250,000
Repayments of long-term debt	(778,209)	(1,252,302)	(2,582,901)
Other borrowings (repayments), net	138,751	(163,721)	54,625
Fees related to early extinguishment of debt	(46,959)	0	(43,340)
Dividends paid to shareholders	(140,557)	(135,353)	(119,302)
Dividends paid to noncontrolling interests	(36,756)	(35,855)	(23,286)
Purchase of noncontrolling interest	0	0	(4,784)
Repurchases of common stock	(250,000)	0	0
Proceeds from exercise of stock options	8,238	9,401	517
Withholding taxes paid on stock-based compensation award distributions	(8,376)	(2,194)	(1,549)
Debt financing costs	0	0	(4,544)
Other	0	0	(3,882)
Net cash used in financing activities	(1,086,868)	(1,580,024)	(478,446)
Net effect of foreign exchange on cash and cash equivalents	8,239	(19,966)	2,154
(Decrease) increase in cash and cash equivalents	(1,132,453)	2,056,022	(2,276,034)
Cash and cash equivalents at end of year	$ 1,137,303	$ 2,269,756	$ 213,734

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies: Basis of Consolidation The consolidated financial statements include the accounts and operations of Albemarle Corporation and our wholly owned, majority owned and controlled subsidiaries. Unless the context otherwise indicates, the terms “Albemarle,” “we,” “us,” “our” or “the Company” mean Albemarle Corporation and its consolidated subsidiaries. For entities that we control and are the primary beneficiary, but own less than 100%, we record the minority ownership as noncontrolling interest. We apply the equity method of accounting for investments in which we have an ownership interest from 20% to 50% or where we exercise significant influence over the related investee’s operations. All significant intercompany accounts and transactions are eliminated in consolidation. As described further in Note 2, “Acquisitions,” we completed our acquisition of Rockwood Holdings, Inc. (“Rockwood”) on January 12, 2015. The consolidated financial statements contained herein include the results of operations of Rockwood, commencing on January 13, 2015. Discontinued Operations Effective January 1, 2015, a component or group of components that is classified as held for sale or that has been disposed of by sale, and which represents a strategic shift that has or will have a major effect on our operations and financial results, is reported as discontinued operations beginning in the period when these criteria are met. Our assets and liabilities held for sale at December 31, 2017 related to the polyolefin catalysts and components business did not meet the criteria to be presented as discontinued operations. On December 14, 2016, the Company closed the sale of the Chemetall Surface Treatment business to BASF SE. In accordance with the applicable accounting guidance, the Company began accounting for this business as discontinued operations in the consolidated statements of income and excluded the business from segment results for all periods presented. See Note 3, “Divestitures,” for additional information. Estimates, Assumptions and Reclassifications The preparation of financial statements in conformity with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of revenues, expenses, assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. Certain amounts in the accompanying consolidated financial statements and notes thereto have been reclassified to conform to the current presentation. Income tax expense for the year ended December 31, 2017 includes expense of $5.1 million due to an adjustment in the Company’s deferred tax liabilities for basis differences in Chilean fixed assets related to the year ended December 31, 2016. The Company does not believe this adjustment is material to the consolidated financial statements for the years ended December 31, 2017 or 2016. In addition, for the year ended December 31, 2017, the Company began reporting its acquisition and integration related costs and restructuring and other costs in Cost of goods sold, Selling, general and administrative expenses and Research and development expenses. See Note 2, “Acquisitions,” and Note 24, “Segment and Geographic Area Information,” for further details. Revenue Recognition We recognize sales when the revenue is realized or realizable, and has been earned, in accordance with authoritative accounting guidance. We recognize net sales as risk and title to the product transfer to the customer, which usually occurs at the time shipment is made. Significant portions of our sales are sold free on board shipping point or on an equivalent basis, and other transactions are based upon specific contractual arrangements. Our standard terms of delivery are generally included in our contracts of sale, order confirmation documents and invoices. We recognize revenue from services when performance of the services has been completed. Where the Company incurs pre-production design and development costs under long-term supply contracts, these costs are expensed where they relate to the products sold unless contractual guarantees for reimbursement exist. Conversely, these costs are capitalized if they pertain to equipment that we will own and use in producing the products to be supplied and expect to utilize for future revenue generating activities. Amounts billed to customers in a sales transaction related to shipping and handling have been classified as net sales and the cost incurred by us for shipping and handling has been classified as cost of goods sold in the accompanying consolidated statements of income. In addition, taxes billed to customers in a sales transaction are presented in the consolidated statements of income on a net basis. Cash and Cash Equivalents Cash and cash equivalents include cash and money market investments with insignificant interest rate risks and no limitations on access. Inventories Inventories are stated at lower of cost and net realizable value with cost determined primarily on the first-in, first-out basis. Cost is determined on the weighted-average basis for a small portion of our inventories at foreign plants and our stores, supplies and other inventory. A portion of our domestic produced finished goods and raw materials are determined on the last-in, first-out basis. Property, Plant and Equipment Property, plant and equipment include costs of assets constructed, purchased or leased under a capital lease, related delivery and installation costs and interest incurred on significant capital projects during their construction periods. Expenditures for renewals and betterments also are capitalized, but expenditures for normal repairs and maintenance are expensed as incurred. Costs associated with yearly planned major maintenance are generally deferred and amortized over 12 months or until the same major maintenance activities must be repeated, whichever is shorter. The cost and accumulated depreciation applicable to assets retired or sold are removed from the respective accounts, and gains or losses thereon are included in income. We assign the useful lives of our property, plant and equipment based upon our internal engineering estimates which are reviewed periodically. The estimated useful lives of our property, plant and equipment range from two to sixty years and depreciation is recorded on the straight-line method, with the exception of our long-term mineral rights, which are depleted on a units-of-production method. We evaluate the recovery of our property, plant and equipment by comparing the net carrying value of the asset group to the undiscounted net cash flows expected to be generated from the use and eventual disposition of that asset group when events or changes in circumstances indicate that its carrying amount may not be recoverable. If the carrying amount of the asset group is not recoverable, the fair value of the asset group is measured and if the carrying amount exceeds the fair value, an impairment loss is recognized. Resource Development Expenses We incur costs in resource exploration, evaluation and development during the different phases of our resource development projects. Exploration costs incurred before obtaining legal rights to explore an area are generally expensed as incurred. After obtaining legal rights, exploration costs are expensed in areas where we have uncertainty about obtaining proven resources. In areas where we have substantial knowledge about the area and consider it probable to obtain commercially viable proven resources, exploration and evaluation costs can be capitalized. If technical feasibility studies have been obtained, resource evaluation expenses are capitalized when the study demonstrates proven or probable resources for which future economic returns are expected, while costs for projects that are not considered viable are expensed. Development costs that are necessary to bring the property to commercial production or increase the capacity or useful life are capitalized. Costs to maintain the production capacity in a property under production are expensed as incurred. Capitalized resource costs are depleted using the units-of-production method. Our resource development assets are evaluated for impairment when events or changes in circumstances indicate that the carrying amount may not be recoverable. Investments Investments are accounted for using the equity method of accounting if the investment gives us the ability to exercise significant influence, but not control, over the investee. Significant influence is generally deemed to exist if we have an ownership interest in the voting stock of the investee between 20% and 50%, although other factors, such as representation on the investee’s board of directors and the impact of commercial arrangements, are considered in determining whether the equity method of accounting is appropriate. Under the equity method of accounting, we record our investments in equity-method investees in the consolidated balance sheets as Investments and our share of investees’ earnings or losses together with other-than-temporary impairments in value as Equity in net income of unconsolidated investments in the consolidated statements of income. We evaluate our equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an equity method investment is determined to be other than temporary, a loss is recorded in earnings in the current period. Our 50% -owned Saudi Organometallic Chemicals Company (“SOCC”) joint venture in Saudi Arabia, included in our Lithium and Advanced Materials segment, experienced a net loss, which affected our equity in income from unconsolidated investments by approximately $3.8 million for the year ended December 31, 2017, indicating the carrying value potentially may be impaired. As a result, we assessed the recoverability of the investment in this venture as of December 31, 2017. As of December 31, 2017, the carrying amount of our equity interest in SOCC was $4.5 million . Based on our assessment, we concluded not to record any impairment of the investment carrying value as of December 31, 2017. We estimated the fair value based on present value techniques involving future cash flows. Future cash flows include assumptions about sales volumes, selling prices, raw material prices, labor and other employee benefit costs, capital additions, income taxes, working capital, and other economic or market-related factors. Significant management judgment is involved in estimating these variables, and they include inherent uncertainties since they are forecasting future events. Certain mutual fund investments are accounted for as trading equities and are marked-to-market on a periodic basis through the consolidated statements of income. Investments in joint ventures and nonmarketable securities of immaterial entities are estimated based upon the overall performance of the entity where financial results are not available on a timely basis. Environmental Compliance and Remediation Environmental compliance costs include the cost of purchasing and/or constructing assets to prevent, limit and/or control pollution or to monitor the environmental status at various locations. These costs are capitalized and depreciated based on estimated useful lives. Environmental compliance costs also include maintenance and operating costs with respect to pollution prevention and control facilities and other administrative costs. Such operating costs are expensed as incurred. Environmental remediation costs of facilities used in current operations are generally immaterial and are expensed as incurred. We accrue for environmental remediation costs and post-remediation costs that relate to existing conditions caused by past operations at facilities or off-plant disposal sites in the accounting period in which responsibility is established and when the related costs are estimable. In developing these cost estimates, we evaluate currently available facts regarding each site, with consideration given to existing technology, presently enacted laws and regulations, prior experience in remediation of contaminated sites, the financial capability of other potentially responsible parties and other factors, subject to uncertainties inherent in the estimation process. If the amount and timing of the cash payments for a site are fixed or reliably determinable, the liability is discounted, if the calculated discount is material. Additionally, these estimates are reviewed periodically, with adjustments to the accruals recorded as necessary. Research and Development Expenses Our research and development expenses related to present and future products are expensed as incurred. These expenses consist primarily of personnel-related costs and other overheads, as well as outside service and consulting costs incurred for specific programs. Our U.S. facilities in Michigan, Pennsylvania, Texas and Louisiana and our global facilities in the Netherlands, Germany, Belgium and Korea form the capability base for our contract research and custom manufacturing businesses. These business areas provide research and scale-up services primarily to innovative life science companies. Goodwill and Other Intangible Assets We account for goodwill and other intangibles acquired in a business combination in conformity with current accounting guidance that requires that goodwill and indefinite-lived intangible assets not be amortized. We test goodwill for impairment by comparing the estimated fair value of our reporting units to the related carrying value. Our reporting units are either our operating business segments or one level below our operating business segments for which discrete financial information is available and for which operating results are regularly reviewed by the business management and the chief operating decision maker. We estimate the fair value based on present value techniques involving future cash flows. Future cash flows include assumptions about sales volumes, selling prices, raw material prices, labor and other employee benefit costs, capital additions, income taxes, working capital, and other economic or market-related factors. Significant management judgment is involved in estimating these variables and they include inherent uncertainties since they are forecasting future events. We perform a sensitivity analysis by using a range of inputs to confirm the reasonableness of these estimates being used in the goodwill impairment analysis. We use a Weighted Average Cost of Capital (“WACC”) approach to determine our discount rate for goodwill recoverability testing. Our WACC calculation incorporates industry-weighted average returns on debt and equity from a market perspective. The factors in this calculation are largely external to the Company and, therefore, are beyond our control. We test our recorded goodwill for impairment in the fourth quarter of each year or upon the occurrence of events or changes in circumstances that would more likely than not reduce the fair value of our reporting units below their carrying amounts. The Company performed its annual goodwill impairment test as of October 31, 2017 and concluded there was no impairment as of that date. In addition, no indications of impairment in any of our reporting units were indicated by the sensitivity analysis. We assess our indefinite-lived intangible assets, which include trade names, for impairment annually and between annual tests if events or changes in circumstances indicate that it is more likely than not that the asset is impaired. The indefinite-lived intangible asset impairment standard allows us to first assess qualitative factors to determine if a quantitative impairment test is necessary. Further testing is only required if we determine, based on the qualitative assessment, that it is more likely than not that the indefinite-lived intangible asset’s fair value is less than its carrying amount. If we determine based on the qualitative assessment that it is more likely than not that the asset is impaired, an impairment test is performed by comparing the fair value of the indefinite-lived intangible asset to its carrying amount. Definite-lived intangible assets, such as purchased technology, patents and customer lists, are amortized over their estimated useful lives generally for periods ranging from five to twenty-five years . Except for customer lists and relationships associated with the majority of our Lithium business, which are amortized using the pattern of economic benefit method, definite-lived intangible assets are amortized using the straight-line method. We evaluate the recovery of our definite-lived intangible assets by comparing the net carrying value of the asset group to the undiscounted net cash flows expected to be generated from the use and eventual disposition of that asset group when events or changes in circumstances indicate that its carrying amount may not be recoverable. If the carrying amount of the asset group is not recoverable, the fair value of the asset group is measured and if the carrying amount exceeds the fair value, an impairment loss is recognized. See Note 12, “Goodwill and Other Intangibles.” Pension Plans and Other Postretirement Benefits Under authoritative accounting standards, assumptions are made regarding the valuation of benefit obligations and the performance of plan assets. As required, we recognize a balance sheet asset or liability for each of our pension and other postretirement benefit (“OPEB”) plans equal to the plan’s funded status as of the measurement date. The primary assumptions are as follows: • Discount Rate—The discount rate is used in calculating the present value of benefits, which is based on projections of benefit payments to be made in the future. • Expected Return on Plan Assets—We project the future return on plan assets based on prior performance and future expectations for the types of investments held by the plans, as well as the expected long-term allocation of plan assets for these investments. These projected returns reduce the net benefit costs recorded currently. • Rate of Compensation Increase—For salary-related plans, we project employees’ annual pay increases, which are used to project employees’ pension benefits at retirement. • Mortality Assumptions—Assumptions about life expectancy of plan participants are used in the measurement of related plan obligations. Actuarial gains and losses are recognized annually in our consolidated statements of income in the fourth quarter and whenever a plan is determined to qualify for a remeasurement during a fiscal year. The remaining components of pension and OPEB plan expense, primarily service cost, interest cost and expected return on assets, are recorded on a monthly basis. The market-related value of assets equals the actual market value as of the date of measurement. During 2017 , we made changes to assumptions related to discount rates and expected rates of return on plan assets. We consider available information that we deem relevant when selecting each of these assumptions. In selecting the discount rates for the U.S. plans, we consider expected benefit payments on a plan-by-plan basis. As a result, the Company uses different discount rates for each plan depending on the demographics of participants and the expected timing of benefit payments. For 2017 , the discount rates were calculated using the results from a bond matching technique developed by Milliman, which matched the future estimated annual benefit payments of each respective plan against a portfolio of bonds of high quality to determine the discount rate. We believe our selected discount rates are determined using preferred methodology under authoritative accounting guidance and accurately reflect market conditions as of the December 31, 2017 measurement date. In selecting the discount rates for the foreign plans, we look at long-term yields on AA-rated corporate bonds when available. Our actuaries have developed yield curves based on the yields on the constituent bonds in the various indices as well as on other market indicators such as swap rates, particularly at the longer durations. For the Eurozone, we apply the Aon Hewitt yield curve to projected cash flows from the relevant plans to derive the discount rate. For the United Kingdom (“U.K.”), the discount rate is determined by applying the Aon Hewitt yield curve for typical schemes of similar duration to projected cash flows of Albemarle’s U.K. plan. In other countries where there is not a sufficiently deep market of high-quality corporate bonds, we set the discount rate by referencing the yield on government bonds of an appropriate duration. In estimating the expected return on plan assets, we consider past performance and future expectations for the types of investments held by the plan as well as the expected long-term allocation of plan assets to these investments. In projecting the rate of compensation increase, we consider past experience in light of movements in inflation rates. In October 2016, the Society of Actuaries (“SOA”) published an updated Mortality Improvement Scale, MP-2016. The updated improvement scale incorporates three additional years of mortality data (2012 – 2014) and a modification of two other input values to improve the model’s year-over-year stability. We utilized the same base mortality, SOA RP-2014 Adjusted to 2006 Total Dataset Mortality, but we revised our mortality assumption to incorporate the MP-2016 Mortality Improvement Scale for purposes of measuring our U.S. pension and OPEB obligations at December 31, 2016. In October 2017, the SOA published an updated Mortality Improvement Scale, MP-2017. The updated improvement scale incorporates an additional year of mortality data (2015). We utilized the same base mortality, SOA RP-2014 Adjusted to 2006 Total Dataset Mortality, but we revised our mortality assumption to incorporate the MP-2017 Mortality Improvement Scale for purposes of measuring our U.S. pension and OPEB obligations at December 31, 2017. Stock-based Compensation Expense The fair value of restricted stock awards, restricted stock unit awards and performance unit awards with a service condition are determined based on the number of shares or units granted and the quoted price of our common stock on the date of grant, and the fair value of stock options is determined using the Black-Scholes valuation model. The fair value of performance unit awards with a service condition and a market condition are estimated on the date of grant using a Monte Carlo simulation model. The fair value of these awards is determined after giving effect to estimated forfeitures. Such value is recognized as expense over the service period, which is generally the vesting period of the equity grant. To the extent restricted stock awards, restricted stock unit awards, performance unit awards and stock options are forfeited prior to vesting in excess of the estimated forfeiture rate, the corresponding previously recognized expense is reversed as an offset to operating expenses. Income Taxes We use the liability method for determining our income taxes, under which current and deferred tax liabilities and assets are recorded in accordance with enacted tax laws and rates. Under this method, the amounts of deferred tax liabilities and assets at the end of each period are determined using the tax rate expected to be in effect when taxes are actually paid or recovered. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not. In order to record deferred tax assets and liabilities, we are following guidance under Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2015-17, which requires deferred tax assets and liabilities to be classified as noncurrent on the balance sheet, along with any related valuation allowance. Deferred income taxes are provided for the estimated income tax effect of temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. Deferred tax assets are also provided for operating losses, capital losses and certain tax credit carryovers. A valuation allowance, reducing deferred tax assets, is established when it is more likely than not that some portion or all of the deferred tax assets will not be realized. The realization of such deferred tax assets is dependent upon the generation of sufficient future taxable income of the appropriate character. Although realization is not assured, we do not establish a valuation allowance when we believe it is more likely than not that a net deferred tax asset will be realized. We only recognize a tax benefit after concluding that it is more likely than not that the benefit will be sustained upon audit by the respective taxing authority based solely on the technical merits of the associated tax position. Once the recognition threshold is met, we recognize a tax benefit measured as the largest amount of the tax benefit that, in our judgment, is greater than 50% likely to be realized. Under current accounting guidance for uncertain tax positions, interest and penalties related to income tax liabilities are included in Income tax expense on the consolidated statements of income. We have designated the undistributed earnings of a portion of our foreign operations as indefinitely reinvested and as a result we do not provide for deferred income taxes on the unremitted earnings of these subsidiaries. If it is determined that cash can be repatriated with little to no tax consequences, we may choose to repatriate cash at that time. The enactment of the Tax Cuts and Jobs Act (“TCJA”) during the fourth quarter of 2017 includes a one-time transition tax on earnings of certain foreign subsidiaries, and as a result, all previously unremitted earnings for which no U.S. deferred tax liability had been accrued are now subject to U.S tax. Despite the U.S. taxation of these amounts, we intend to invest most or all of these earnings indefinitely outside of the U.S and do not provide for deferred income taxes on the unremitted earnings of these subsidiaries. Our foreign earnings are computed under U.S. federal tax earnings and profits, or E&P, principles. In general, to the extent our financial reporting book basis over tax basis of a foreign subsidiary exceeds these E&P amounts, deferred taxes have not been provided as they are essentially permanent in duration. The determination of the amount of such unrecognized deferred tax liability is not practicable. We provide for deferred income taxes on our undistributed earnings of foreign operations that are not deemed to be indefinitely invested. We will continue to evaluate our permanent reinvestment assertion taking into consideration the TCJA. The accounting is expected to be completed within the measurement period, as allowed under Staff Accounting Bulletin (“SAB”) 118. Accumulated Other Comprehensive (Loss) Income Accumulated other comprehensive (loss) income comprises principally foreign currency translation adjustments, amounts related to the revaluation of our euro-denominated senior notes which were designated as a hedge of our net investment in foreign operations in 2014, a realized loss on a forward starting interest rate swap entered into in 2014 which was designated as a cash flow hedge, and deferred income taxes related to the aforementioned items. Foreign Currency Translation The assets and liabilities of all foreign subsidiaries were prepared in their respective functional currencies and translated into U.S. Dollars based on the current exchange rate in effect at the balance sheet dates, while income and expenses were translated at average exchange rates for the periods presented. Translation adjustments are reflected as a separate component of equity. Foreign exchange transaction and revaluation (losses) gains were ($11.1) million , $2.4 million and $51.8 million for the years ended December 31, 2017 , 2016 and 2015 , respectively, and are included in Other (expenses) income, net, in our consolidated statements of income, with the unrealized portion included in Other, net, in our consolidated statements of cash flows. The gains in 2015 are primarily related to cash denominated in U.S. Dollars held by foreign subsidiaries where the European Union Euro serves as the functional currency, which was repatriated using the applicable transaction rates during the first quarter of 2015. Derivative Financial Instruments We manage our foreign currency exposures by balancing certain assets and liabilities denominated in foreign currencies and through the use of foreign currency forward contracts from time to time, which generally expire within one year . The principal objective of such contracts is to minimize the financial impact of changes in foreign currency exchange rates. While these contracts are subject to fluctuations in value, such fluctuations are generally expected to be offset by changes in the value of the underlying foreign currency exposures being hedged. Unless otherwise noted, gains and losses on foreign currency forward contracts are recognized currently in Other (expenses) income, net, and generally do not have a significant impact on results of operations. We may also enter into interest rate swaps, collars or similar instruments from time to time, with the objective of reducing interest rate volatility relating to our borrowing costs. The counterparties to these contractual agreements are major financial institutions with which we generally have other financial relationships. We are exposed to credit loss in the event of nonperformance by these counterparties. However, we do not anticipate nonperformance by the counterparties. We do not utilize financial instruments for trading or other speculative purposes. Our foreign currency forward contracts outstanding at December 31, 2017 and 2016 have not been designated as hedging instruments under Accounting Standards Codification (“ASC”) 815, Derivatives and Hedging . Recently Issued Accounting Pronouncements In May 2014, the FASB issued accounting guidance designed to enhance comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. The core principle of the guidance is that revenue recognized from a transaction or event that arises from a contract with a customer should reflect the consideration to which an entity expects to be entitled in exchange for goods or services provided. To achieve that core principle the new guidance sets forth a five-step revenue recognition model that will need to be applied consistently to all contracts with customers, except those that are within the scope of other topics in the ASC. Also required are new disclosures to help users of financial statements better understand the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The new disclosures include qualitative and quantitative information about contracts with customers, significant judgments made in applying the revenue guidance, and assets recognized related to the costs to obtain or fulfill a contract. During 2016, the FASB issued amendments to this new guidance that provided clarification, technical corrections and practical expedients. Topics of potential relevance to the Company include principal versus agent considerations, collectability, presentation of sales tax from customers, contract modifications at transition and accounting transition. We will adopt the new standard in the first quarter of 2018 using the modified retrospective method. We have evaluated our existing contracts and accounting policies and do not expect the adoption of this standard to have a material impact on our consolidated financial statements. We have implemented, or will implement in the first quarter of 2018, appropriate changes to the business processes, controls and control activities to support recognition, presentation and disclosure under the new standard for the first quarter of 2018, however, we have not made any significant changes to our existing systems as a result of this new standard. In addition, we continue to assess the new presentation and disclosures that will be required in our first quarter 2018 Form 10-Q. In July 2015, the FASB iss

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2017
Business Combinations [Abstract]
Acquisitions	Acquisitions: On February 1, 2017, the Company acquired the remaining 50% interest in the Sales de Magnesio Ltda. (“Salmag”) joint venture in Chile from SQM Salar S.A. for approximately $8.3 million , net of cash acquired. In connection with the acquisition, the Company recorded a gain of $6.2 million , calculated based on the difference between the purchase price and the book value of the investment in Other (expenses) income, net on the consolidated statements of income for the year ended December 31, 2017 . On December 31, 2016, we completed the acquisition of all equity interests in the lithium hydroxide and lithium carbonate conversion business of Jiangxi Jiangli New Materials Science and Technology Co. Ltd. (“Jiangli New Materials”) for a cash purchase price of approximately $145 million . This includes manufacturing assets located in both Jiangxi and Sichuan, China focused on the production of battery-grade lithium carbonate and lithium hydroxide. This acquisition will enable us to supply premium lithium salts to an expanded global customer base while solidifying our leading position in the lithium industry. The aggregate purchase price was allocated to the major categories of assets and liabilities acquired based upon their estimated fair values as of December 31, 2016, which were based, in part, upon outside preliminary appraisals for certain assets. The allocation of the Jiangli New Materials acquisition was finalized in the fourth quarter of 2017. The fair values of the assets and liabilities acquired were primarily related to Accounts receivable of $0.6 million , Property, plant and equipment of $24.1 million , Other intangibles of $46.3 million , Accounts payable of $2.8 million and Deferred tax liabilities of $6.3 million . In addition, the estimated fair value of the remaining net working capital acquired was $6.2 million , however, an equal liability was recorded in Accrued expenses, as it will be repaid to the previous owners of the acquired business. The excess of the purchase price over the estimated fair value of the net assets acquired was approximately $83.1 million and was recorded as goodwill. During the year ended December 31, 2017 , the Company purchased inventory with a fair value of $37.1 million in connection with the Jiangli New Materials acquisition. The fair value included the markup of the underlying book value of $23.1 million , which was expensed in Cost of goods sold during the year ended December 31, 2017, the estimated remaining selling period. Goodwill arising from the acquisition consists largely of the anticipated synergies and economies of scale from the combined assets and the overall strategic importance of the acquired assets to Albemarle. The goodwill attributable to the acquisition will not be amortizable or deductible for tax purposes. The weighted-average amortization periods for the other intangible assets acquired are 20 years for patents and technology, 13 years for customer lists and relationships and 20 years for other. The weighted-average amortization period for all definite-lived intangible assets acquired is 17 years. Acquisition and integration related costs for the year ended December 31, 2017 of $14.3 million were included in Cost of goods sold and $19.6 million were included in Selling, general and administrative expenses on our consolidated statements of income. These acquisition and integration related costs relate to various significant projects, including the Jiangli New Materials acquisition, which contains unusual compensation related costs negotiated specifically as a result of this acquisition that are outside of the Company’s ordinary compensation arrangements. Rockwood Merger On January 12, 2015 (the “Acquisition Closing Date”), we completed the acquisition of all outstanding shares of Rockwood (the “Merger”) for a purchase price of approximately $ 5.7 billion . As a result, Rockwood became a wholly-owned subsidiary of Albemarle. Through the acquisition of Rockwood, we became a leading integrated and low cost global producer of lithium and lithium compounds used in lithium-ion batteries for electronic devices, alternative transportation vehicles and energy storage technologies, meeting the significant growth in global demand for these products. The aggregate purchase price noted above was allocated to the major categories of assets and liabilities acquired based upon their estimated fair values at the Acquisition Closing Date, which were based, in part, upon third-party appraisals for certain assets, including specifically-identified intangible assets. The excess of the purchase price over the estimated fair value of the net assets acquired was approximately $2.8 billion and was recorded as goodwill. Goodwill arising from the acquisition consists largely of the anticipated synergies and economies of scale from the combined companies and the overall strategic importance of the acquired businesses to Albemarle. The goodwill attributable to the acquisition is not amortizable or deductible for tax purposes. Included in Acquisition and integration related costs on our consolidated statements of income for the years ended December 31, 2016 and 2015 is $52.1 million and $123.9 million , respectively, of integration costs resulting from the acquisition of Rockwood (mainly consisting of professional services fees, costs to achieve synergies, relocation costs, and other integration costs) and $5.3 million and $8.4 million , respectively, of costs in connection with other significant projects. Unaudited Pro Forma Financial Information The following unaudited pro forma results of operations of the Company for the year ended December 31, 2015 assume that the Merger occurred on January 1, 2014. The pro forma amounts include certain adjustments, including interest expense, depreciation, amortization expense and income taxes. The pro forma amounts for the year ended December 31, 2015 were adjusted to exclude approximately $137.7 million of nonrecurring acquisition and integration related costs. Additionally, pro forma amounts for the year ended December 31, 2015 were adjusted to exclude approximately $103.4 million of charges related to the utilization of the inventory markup as further described in Note 24, “Segment and Geographic Area Information.” The pro forma results do not include adjustments related to cost savings or other synergies anticipated as a result of the Merger. In addition, pro forma amounts are not adjusted to reflect the Chemetall Surface Treatment business as discontinued operations. Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisition had occurred as of January 1, 2014, nor are they indicative of future results of operations. Year Ended December 31, 2015 (in thousands, except per share amounts) Pro forma Net sales $ 3,684,665 Pro forma Net income $ 527,997 Pro forma Net income per share: Basic $ 4.75 Diluted $ 4.73 Other Acquisitions In 2015, our former Chemetall Surface Treatment business completed several additional acquisitions, including (1) all remaining shares of its Shanghai Chemetall joint venture for a purchase price of $57.6 million , (2) the aluminum finishing business of Chemal GmbH & Co. KG (“Chemal GmbH”), based in Hamm, Germany for a purchase price of $2.2 million and (3) the remaining noncontrolling interests’ share of Nanjing Chemetall Surface Technologies Co., Ltd for a purchase price of $4.8 million . The ownership interests of each of these acquisitions were transferred to BASF SE in the sale of the Chemetall Surface Treatment business on December 14, 2016. See Note 3, “Divestitures,” for additional information about the sale of the Chemetall Surface Treatment business.

Divestitures

Divestitures	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]	Divestitures: Assets Held for Sale On December 14, 2017, the Company signed a definitive agreement to sell the polyolefin catalysts and components portion of its Performance Catalyst Solutions (“PCS”) business to W.R. Grace & Co. for proceeds of approximately $416 million in cash. The transaction includes Albemarle’s Product Development Center located in Baton Rouge, Louisiana, and operations at its Yeosu, South Korea site. The sale does not include the Company’s organometallics or curatives portion of its PCS business. The sale of the polyolefin catalysts business and components reflects the Company’s commitment to investing in the future growth of its high priority businesses and returning capital to shareholders. The sale is expected to close in the first quarter of 2018, subject to the satisfaction of customary closing conditions, including approvals from regulatory authorities. We currently expect to record a gain in the first quarter of 2018 related to the sale of this business. In the fourth quarter of 2017, we determined that the assets held for sale criteria in accordance with ASC 360, Property, Plant and Equipment , were met for this business. As such, the assets and liabilities of this business are included in Assets held for sale and Liabilities held for sale, respectively, in the consolidated balance sheet as of December 31, 2017. The carrying amounts of the major classes of assets and liabilities that were classified as held for sale at December 31, 2017, are as follows (in thousands): Assets Current assets $ 39,152 Net property, plant and equipment 121,759 Goodwill 14,422 Other intangibles, net of amortization 3,632 Assets held for sale $ 178,965 Liabilities Current liabilities $ 1,938 Noncurrent liabilities 614 Liabilities held for sale $ 2,552 The results of operations of the business classified as held for sale is included in continuing operations within the consolidated statements of income. This business did not qualify for discontinued operations treatment because the Company’s management does not consider the sale as representing a strategic shift that had or will have a major effect on the Company’s operations and financial results. Chemetall Surface Treatment Business On June 17, 2016, we entered into a definitive agreement to sell the Chemetall Surface Treatment business to BASF SE. On December 14, 2016, the Company closed the sale of this business and received cash proceeds of approximately $3.1 billion . Included in Income from discontinued operations (net of tax) for the year ended December 31, 2016 is a pre-tax gain of $388.0 million ( $135.0 million after income taxes) related to the sale of this business, which included a reversal of $81.4 million of foreign currency translation loss out of Accumulated oth er comprehensive loss. This gain represents the difference between the carrying value of the related net assets and their fair value as determined by the sales price less estimated costs to sell. During the second quarter of 2017, we received a final working capital settlement of $6.9 million related to the sale of this business. The sale of the Chemetall Surface Treatment business reflects the Company’s commitment to investing in the future growth of its high priority businesses, reducing leverage and returning capital to shareholders. The Chemetall Surface Treatment business was acquired on January 12, 2015 as part of the acquisition of Rockwood, see Note 2, “Acquisitions,” for further details. The sale of the Chemetall Surface Treatment business, a separate reportable segment, qualified for discontinued operations treatment because it represented a strategic shift that will have a major effect on the Company’s operations and financial results . As a result, in the second quarter of 2016, the Company accounted for this business as discontinued operations in the consolidated statements of income and excluded the business from segment results for the years ended December 31, 2016 and 2015, the periods this business was owned by Albemarle. As of the date this business qualified for discontinued operations treatment, the Company stopped recording depreciation and amortization expense on assets of the Chemetall Surface Treatment business. The major components of Income from discontinued operations (net of tax) for the years ended December 31, 2016 and 2015 were as follows (in thousands): Year Ended December 31, 2016 2015 Net sales $ 813,285 $ 824,906 Cost of goods sold 416,934 488,267 Operating expenses, net (a) 268,402 239,316 Interest and financing expenses (b) 38,227 51,072 Other income, net (2,485 ) (4,214 ) Gain on sale of discontinued operations (387,980 ) — Income before income taxes 480,187 50,465 Income tax expense (c) 278,056 17,989 Income from discontinued operations (net of tax) $ 202,131 $ 32,476 (a) Operating expenses, net for discontinued operations includes mark-to market actuarial (losses) gains of ($8.5) million and $8.9 million during the years ended December 31, 2016 and 2015, respectively. (b) Interest and financing expenses included the allocation of interest expense not directly attributab le to other operations as well as interest expense related to debt to be assumed by the buyer. The allocation of interest expense to discontinued operations was based on the ratio of net assets held for sale to the sum of total net assets plus consolidated debt. (c) Income tax expense for the year ended December 31, 2016 included a charge of $253.0 million related to the gain on sale of discontinued operations. Depreciation and amortization and capital expenditures from discontinued operations for the years ended December 31, 2016 and 2015 were as follows (in thousands): Year Ended December 31, 2016 2015 Depreciation and amortization $ 35,194 $ 78,903 Capital expenditures $ 19,281 $ 23,738 Other Divestitures In 2015, we announced our intention to pursue strategic alternatives, including divestitures, related to certain businesses which include minerals-based flame retardants and specialty chemicals, fine chemistry services and metal sulfides. These businesses did not qualify for discontinued operations treatment because the Company’s management did not consider their sale as representing a strategic shift that had or will have a major effect on the Company’s operations and financial results . On November 5, 2015, the Company signed a definitive agreement to sell its Tribotecc metal sulfides business to Treibacher Industrie AG. Included in the transaction were sites in Vienna and Arnoldstein, Austria, and Tribotecc’s proprietary sulfide synthesis process. On January 4, 2016, t he Company closed the sale of this business, effective for the first day of business in 2016. We received net proceeds of approximate ly $137 million and recorded a gain of $11.5 million before income taxes in 2016 related to the sale of this business. On December 16, 2015, the Company signed a definitive agreement to sell its minerals-based flame retardants and specialty chemicals business to Huber Engineered Materials, a division of J.M. Huber Corporation. The transaction included Albemarle’s Martinswerk GmbH subsidiary and manufacturing facility located in Bergheim, Germany, and Albemarle’s 50% ownership interest in Magnifin Magnesiaprodukte GmbH, a joint-venture with Radex Heraklith Industriebeteiligung AG in Breitenau, Au stria. On February 1, 2016, the Company closed the sale of these businesses. We received net proceeds of approximately $187 million and recorded a gain of $112.3 million before income taxes in 2016 related to the sale of these businesses. In April 2016, the Company concluded that it would discontinue efforts to sell its fine chemistry services business, and as a result, this business is accounted for as held and used beginning in the second quarter of 2016. Also included in Gain on sales of businesses, net, for the year ended December 31, 2016 was a loss of $1.5 million on the sale of our wafer reclaim business.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information: Supplemental information related to the consolidated statements of cash flows is as follows (in thousands): Year Ended December 31, 2017 2016 2015 Cash paid during the year for: Income taxes (net of refunds of $17,522, $9,270 and $7,333 in 2017, 2016 and 2015, respectively) (a) $ 320,222 $ 143,404 $ 162,408 Interest (net of capitalization) $ 61,243 $ 96,948 $ 153,271 Supplemental non-cash disclosures related to investing activities: Capital expenditures included in Accounts payable $ 89,188 $ 33,622 $ 45,826 (a) Includes approximately $257 million of income taxes paid in 2017 from the gain on sale of the Chemetall Surface Treatment business and approximately $111 million of income taxes paid in 2015 on repatriation of earnings from legacy Rockwood entities. Other, net within Cash flows from operating activities on the consolidated statements of cash flows for the year ended December 31, 2017 included the $394.9 million noncurrent portion of the one-time transition tax resulting from the enactment of the TCJA. For additional information, see Note 20, “Income Taxes.” In addition, included in Other, net for the years ended December 31, 2017, 2016 and 2015 is $11.1 million , $40.8 million and ($70.7) million , respectively, related to losses (gains) on fluctuations in foreign currency exchange rates, as well as, a working capital settlement of $7.6 million related to a previously disposed business for the year ended December 31, 2015 .

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share: Basic and diluted earnings per share from continuing operations are calculated as follows (in thousands, except per share amounts): Year Ended December 31, 2017 2016 2015 Basic earnings per share from continuing operations Numerator: Net income from continuing operations $ 99,468 $ 478,638 $ 327,588 Net income from continuing operations attributable to noncontrolling interests (44,618 ) (37,094 ) (25,158 ) Net income from continuing operations attributable to Albemarle Corporation $ 54,850 $ 441,544 $ 302,430 Denominator: Weighted-average common shares for basic earnings per share 110,914 112,379 111,182 Basic earnings per share from continuing operations $ 0.49 $ 3.93 $ 2.72 Diluted earnings per share from continuing operations Numerator: Net income from continuing operations $ 99,468 $ 478,638 $ 327,588 Net income from continuing operations attributable to noncontrolling interests (44,618 ) (37,094 ) (25,158 ) Net income from continuing operations attributable to Albemarle Corporation $ 54,850 $ 441,544 $ 302,430 Denominator: Weighted-average common shares for basic earnings per share 110,914 112,379 111,182 Incremental shares under stock compensation plans 1,466 860 374 Weighted-average common shares for diluted earnings per share 112,380 113,239 111,556 Diluted earnings per share from continuing operations $ 0.49 $ 3.90 $ 2.71 At December 31, 2017 , all common stock equivalents were included in the computation of diluted earnings per share. Included in the calculation of basic earnings per share are unvested restricted stock awards that contain nonforfeitable rights to dividends. At December 31, 2017 , there were 8,050 unvested shares of restricted stock awards outstanding. We have the authority to issue 15 million shares of preferred stock in one or more classes or series. As of December 31, 2017 , no shares of preferred stock have been issued. In November 2016, our Board of Directors authorized an increase in the number of shares the Company is permitted to repurchase under our share repurchase program, pursuant to which the Company is now permitted to repurchase up to a maximum of 15 million shares, including those previously authorized but not yet repurchased. Under our existing Board-authorized share repurchase program, the Company entered into an accelerated share repurchase (“ASR”) agreement with a financial institution on March 1, 2017. Under the ASR agreement, in March 2017, the Company paid $250 million from available cash on hand and received and retired an initial delivery of 1,948,178 shares of our common stock. Under the terms of the ASR agreement, on June 16, 2017, the transaction was completed and we received and retired a final settlement of 392,905 shares, calculated based on the daily Rule 10b-18 volume-weighted average prices of the Company’s common stock over the term of the ASR agreement, less an agreed discount. The Company determined that the ASR agreement met the criteria to be accounted for as a forward contract indexed to its stock and was therefore treated as an equity instrument. In total, we received and retired 2,341,083 shares under the ASR agreement, which reduced the Company’s weighted average shares outstanding for purposes of calculating basic and diluted earnings per share for the year ended December 31, 2017. There were no shares of the Company’s common stock repurchased during the years ended December 31, 2016 and 2015. As of December 31, 2017 , there were 12,658,917 remaining shares available for repurchase under the Company’s authorized share repurchase program.

Other Accounts Receivable

Other Accounts Receivable	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Other Accounts Receivable	Other Accounts Receivable: Other accounts receivable consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Value added tax/consumption tax $ 23,158 $ 15,324 Other 14,779 26,661 Total $ 37,937 $ 41,985

Inventories

Inventories	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories: The following table provides a breakdown of inventories at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Finished goods (a) $ 404,239 $ 289,102 Raw materials and work in process (b) 132,891 109,706 Stores, supplies and other 55,651 51,455 Total (c) $ 592,781 $ 450,263 (a) Increase primarily due to the Jiangli New Materials acquisition and the build up of inventory at other Lithium sites for an increase in sales in 2018. (b) Included $59.6 million and $47.1 million at December 31, 2017 and 2016 , respectively, of work in process related to the Lithium product category. (c) As of December 31, 2017, $24.7 million of Inventories were classified as Assets held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information. Approximately 17% and 19% of our inventories are valued using the last-in, first-out (“LIFO”) method at December 31, 2017 and 2016 , respectively. The portion of our domestic inventories stated on the LIFO basis amounted to $99.6 million and $87.5 million at December 31, 2017 and 2016 , respectively, which are below replacement cost by approximately $33.1 million and $33.8 million , respectively.

Other Current Assets

Other Current Assets	12 Months Ended
	Dec. 31, 2017
Other Assets [Abstract]
Other Current Assets	Other Current Assets: Other current assets consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Income tax receivables $ 47,130 $ 15,085 Prepaid expenses 86,348 42,240 Other 2,586 1,254 Total $ 136,064 $ 58,579

Property, Plant and Equipment

Property, Plant and Equipment	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment	Property, Plant and Equipment: Property, plant and equipment, at cost, consist of the following at December 31, 2017 and 2016 (in thousands): Useful Lives (Years) December 31, 2017 2016 Land — $ 118,428 $ 120,842 Land improvements 10 – 30 63,328 59,387 Buildings and improvements 10 – 45 245,482 256,603 Machinery and equipment (a) 2 – 45 2,627,667 2,501,481 Long-term mineral rights and production equipment costs 7 – 60 675,832 654,006 Construction in progress — 393,598 318,203 Total (b) $ 4,124,335 $ 3,910,522 (a) Consists primarily of (1) short-lived production equipment components, office and building equipment and other equipment with estimated lives ranging 2 – 7 years, (2) production process equipment (intermediate components) with estimated lives ranging 8 – 19 years, (3) production process equipment (major unit components) with estimated lives ranging 20 – 29 years, and (4) production process equipment (infrastructure and other) with estimated lives ranging 30 – 45 years. (b) As of December 31, 2017, $215.9 million of Property, plant and equipment, at cost, was classified as Assets held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information. The cost of property, plant and equipment is depreciated generally by the straight-line method. Depletion of long-term mineral rights is based on the units-of-production method. Depreciation expense amounted to $169.5 million , $178.8 million and $162.2 million during the years ended December 31, 2017 , 2016 and 2015 , respectively. Depreciation expense related to discontinued operations was $8.9 million and $18.5 million during the years ended December 31, 2016 and 2015, respectively. Interest capitalized on significant capital projects in 2017 , 2016 and 2015 was $7.4 million , $6.8 million and $11.2 million , respectively.

Investments

Investments	12 Months Ended
	Dec. 31, 2017
Investments [Abstract]
Investments	Investments: Investments include our share of unconsolidated joint ventures, nonmarketable securities and marketable equity securities. The following table details our investment balances at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Joint ventures $ 499,756 $ 429,794 Nonmarketable securities 3,655 169 Marketable equity securities 30,653 27,570 Total $ 534,064 $ 457,533 Our ownership positions in significant unconsolidated investments are shown below: December 31, 2017 2016 2015 * Windfield Holdings Pty. Ltd. - a joint venture with Sichuan Tianqi Lithium Industries, Inc., that mines lithium ore and produces lithium concentrate 49 % 49 % 49 % * Nippon Aluminum Alkyls - a joint venture with Mitsui Chemicals, Inc. that produces aluminum alkyls 50 % 50 % 50 % * Magnifin Magnesiaprodukte GmbH & Co. KG - a joint venture with Radex Heraklith Industriebeteiligung AG that produces specialty magnesium hydroxide products (a) — % — % 50 % * Nippon Ketjen Company Limited - a joint venture with Sumitomo Metal Mining Company Limited that produces refinery catalysts 50 % 50 % 50 % * Eurecat S.A. - a joint venture with Axens Group for refinery catalysts regeneration services 50 % 50 % 50 % * Fábrica Carioca de Catalisadores S.A. - a joint venture with Petrobras Quimica S.A. - PETROQUISA that produces catalysts and includes catalysts research and product development activities 50 % 50 % 50 % (a) On February 1, 2016, we sold our investment in Magnifin as part of the sale of the minerals-based flame retardants and specialty chemicals business. Refer to Note 3, “Divestitures,” for additional information. Our investment in the significant unconsolidated joint ventures above amounted to $479.1 million and $404.6 million as of December 31, 2017 and 2016 , respectively, and the amount included in Equity in net income of unconsolidated investments (net of tax) in the consolidated statements of income totaled $86.8 million , $56.8 million and $25.4 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. As further described in Note 24, “Segment and Geographic Area Information,” Equity in net income of unconsolidated investments (net of tax) for the year ended December 31, 2015 was reduced by $27.1 million related to the utilization of the inventory markup to fair value in connection with the acquisition of Rockwood. Undistributed earnings attributable to our significant unconsolidated investments represented approximately $127.5 million and $99.4 million of our consolidated retained earnings at December 31, 2017 and 2016 , respectively. All of the unconsolidated joint ventures in which we have investments are private companies and accordingly do not have a quoted market price available. The following summary lists our assets, liabilities and results of operations for our significant unconsolidated joint ventures presented herein (in thousands): December 31, 2017 2016 Summary of Balance Sheet Information: Current assets $ 503,043 $ 383,203 Noncurrent assets 1,041,519 913,643 Total assets $ 1,544,562 $ 1,296,846 Current liabilities $ 133,670 $ 138,474 Noncurrent liabilities 405,662 319,801 Total liabilities $ 539,332 $ 458,275 Year Ended December 31, 2017 2016 2015 Summary of Statements of Income Information: Net sales $ 687,561 $ 590,980 $ 560,376 Gross profit $ 353,577 $ 267,241 $ 253,569 Income before income taxes $ 267,805 $ 189,016 $ 157,501 Net income $ 184,777 $ 126,872 $ 111,491 We have evaluated each of the unconsolidated investments pursuant to current accounting guidance and none qualify for consolidation. Dividends received from our significant unconsolidated investments were $38.1 million , $42.1 million and $58.1 million in 2017 , 2016 and 2015 , respectively. At December 31, 2017 and 2016 , the carrying amount of our investments in unconsolidated joint ventures differed from the amount of underlying equity in net assets by approximately $13.8 million and ($6.8) million , respectively. These amounts represent the differences between the value of certain assets of the joint ventures and our related valuation on a U.S. GAAP basis. As of December 31, 2017 and 2016 , $0.4 million and $0.6 million , respectively, remained to be amortized over the remaining useful lives of the assets with the balance of the difference representing primarily our share of the joint ventures’ goodwill. The Company holds a 49% equity interest in Windfield Holdings Pty. Ltd. (“Windfield”), which we acquired in the Rockwood acquisition. With regards to the Company’s ownership in Windfield, the parties share risks and benefits disproportionate to their voting interests. As a result, the Company considers Windfield to be a variable interest entity (“VIE”). However, the Company does not consolidate Windfield as it is not the primary beneficiary. The carrying amount of our 49% equity interest in Windfield, which is our most significant VIE, was $355.2 million and $288.6 million at December 31, 2017 and December 31, 2016 , respectively. The Company’s aggregate net investment in all other entities which it considers to be VIE’s for which the Company is not the primary beneficiary was $8.7 million and $8.8 million at December 31, 2017 and December 31, 2016 , respectively. Our unconsolidated VIE’s are reported in Investments in the consolidated balance sheets. The Company does not guarantee debt for, or have other financial support obligations to, these entities, and its maximum exposure to loss in connection with its continuing involvement with these entities is limited to the carrying value of the investments. Included in the consolidated statement of cash flows for the year ended December 31, 2015, is a return of capital from Windfield of $98.0 million . As part of the original Windfield joint venture agreement, Tianqi Lithium Corporation (“Tianqi”) was granted an option to purchase from 20% to 30% of the equity interests in Rockwood Lithium GmbH, a wholly-owned German subsidiary of Albemarle, and its subsidiaries. In February 2017, Albemarle and Tianqi terminated the option agreement, and as a result, we will retain 100% of the ownership interest in Rockwood Lithium GmbH and its subsidiaries. Following the termination of the option agreement, the $13.1 million fair value of the option agreement originally recorded in Noncontrolling interests was reversed and recorded as an adjustment to Additional paid-in capital. The Company holds a 50% equity interest in Jordan Bromine Company Limited (“JBC”), reported in the Bromine Specialties segment. The Company consolidates this venture as it is considered the primary beneficiary due to its operational and financial control. We maintain a Benefit Protection Trust (the “Trust”) that was created to provide a source of funds to assist in meeting the obligations of our Executive Deferred Compensation Plan (“EDCP”), subject to the claims of our creditors in the event of our insolvency. Assets of the Trust, in conjunction with our EDCP, are accounted for as trading securities in accordance with authoritative accounting guidance. The assets of the Trust consist primarily of mutual fund investments and are marked-to-market on a monthly basis through the consolidated statements of income. As of December 31, 2017 and 2016 , these marketable securities amounted to $25.5 million and $22.0 million , respectively. Our 50% -owned SOCC joint venture in Saudi Arabia, included in our Lithium and Advanced Materials segment, experienced a net loss, which affected our equity in income from unconsolidated investments by approximately $3.8 million for the year ended December 31, 2017, indicating the carrying value potentially may be impaired. As a result, we assessed the recoverability of the investment in this venture as of December 31, 2017. As of December 31, 2017, the carrying amount of our equity interest in SOCC was $4.5 million . Based on our assessment, we concluded not to record any impairment of the investment carrying value as of December 31, 2017.

Other Assets

Other Assets	12 Months Ended
	Dec. 31, 2017
Other Assets, Noncurrent [Abstract]
Other Assets	Other Assets: Other assets consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Deferred income taxes (a) $ 25,108 $ 61,132 Assets related to unrecognized tax benefits (a) 14,601 15,076 Other (b) 34,455 66,112 Total $ 74,164 $ 142,320 (a) See Note 1, “Summary of Significant Accounting Policies” and Note 20, “Income Taxes.” (b) As of December 31, 2017, a $28.7 million reserve was recorded against a note receivable on one of our European entities no longer deemed probable of collection.

Goodwill and Other Intangibles

Goodwill and Other Intangibles	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangibles	Goodwill and Other Intangibles: The following table summarizes the changes in goodwill by reportable segment for the years ended December 31, 2017 and 2016 (in thousands): Lithium and Advanced Materials Bromine Specialties Refining Solutions All Other Total Balance at December 31, 2015 $ 1,267,505 $ 20,319 $ 172,728 $ — $ 1,460,552 Acquisition of Rockwood (a) (1,706 ) — — — (1,706 ) Other acquisitions (b) 113,555 — — — 113,555 Reclass from assets held for sale (c) — — — 6,586 6,586 Foreign currency translation adjustments (31,093 ) — (7,862 ) — (38,955 ) Balance at December 31, 2016 1,348,261 20,319 164,866 6,586 1,540,032 Other acquisitions (d) (26,151 ) — — — (26,151 ) Reclass to assets held for sale (e) (14,422 ) — — — (14,422 ) Foreign currency translation adjustments and other 88,452 — 22,444 — 110,896 Balance at December 31, 2017 $ 1,396,140 $ 20,319 $ 187,310 $ 6,586 $ 1,610,355 (a) Represents final purchase price adjustments for the Rockwood acquisition recorded for the year ended December 31, 2016. Excludes $3.2 million of final purchase price adjustments for businesses reported as discontinued operations. (b) Represents preliminary purchase price adjustments for the Jiangli New Materials acquisition recorded for the year ended December 31, 2016. See Note 2, “Acquisitions,” for additional information. (c) Represents Goodwill of the fine chemistry services business, which was reported in Assets held for sale on the consolidated balance sheets as of December 31, 2015, but reclassified back to Goodwill during the year end December 31, 2016. See Note 3, “Divestitures,” for additional information. (d) Primarily represents final purchase price adjustments for the Jiangli New Materials acquisition recorded for the year ended December 31, 2017. See Note 2, “Acquisitions,” for additional information. (e) Represents Goodwill of the polyolefin catalysts and components portion of the PCS business. See Note 3, “Divestitures,” for additional information. Other intangibles consist of the following at December 31, 2017 and 2016 (in thousands): Customer Lists and Relationships Trade Names and Trademarks (a) Patents and Technology Other Total Gross Asset Value Balance at December 31, 2015 $ 398,725 $ 16,923 $ 40,144 $ 17,779 $ 473,571 Reclass from assets held for sale (b) — — — 1,454 1,454 Foreign currency translation adjustments and other (10,832 ) (409 ) (1,710 ) (389 ) (13,340 ) Balance at December 31, 2016 387,893 16,514 38,434 18,844 461,685 Acquisitions (c) 19,225 1,429 20,381 18,847 59,882 Reclass to assets held for sale (d) — — — (4,228 ) (4,228 ) Foreign currency translation adjustments and other 32,194 1,038 2,803 3,793 39,828 Balance at December 31, 2017 $ 439,312 $ 18,981 $ 61,618 $ 37,256 $ 557,167 Accumulated Amortization Balance at December 31, 2015 $ (32,656 ) $ (8,086 ) $ (32,008 ) $ (16,953 ) $ (89,703 ) Amortization (18,034 ) — (574 ) (431 ) (19,039 ) Reclass from assets held for sale (b) — — — (1,322 ) (1,322 ) Foreign currency translation adjustments and other 1,525 134 899 385 2,943 Balance at December 31, 2016 (49,165 ) (7,952 ) (31,683 ) (18,321 ) (107,121 ) Amortization (21,288 ) — (1,412 ) (2,379 ) (25,079 ) Reclass to assets held for sale (d) — — — 596 596 Foreign currency translation adjustments and other (4,251 ) (343 ) (2,108 ) 2,642 (4,060 ) Balance at December 31, 2017 $ (74,704 ) $ (8,295 ) $ (35,203 ) $ (17,462 ) $ (135,664 ) Net Book Value at December 31, 2016 $ 338,728 $ 8,562 $ 6,751 $ 523 $ 354,564 Net Book Value at December 31, 2017 $ 364,608 $ 10,686 $ 26,415 $ 19,794 $ 421,503 (a) Balances as of December 31, 2016 and 2017 include only indefinite-lived intangible assets. (b) Represents Other intangibles and related amortization of the fine chemistry services business, which was reported in Assets held for sale on the consolidated balance sheets as of December 31, 2015, but reclassified back to Other intangibles during the year end December 31, 2016. See Note 3, “Divestitures,” for additional information. (c) Represents final purchase price adjustments for the Jiangli New Materials acquisition and the acquisition of the remaining equity interest in Salmag. See Note 2, “Acquisitions,” for additional information. (d) Represents Other intangibles and related amortization of the polyolefin catalysts and components portion of the PCS business. See Note 3, “Divestitures,” for additional information. Useful lives range from 13 – 25 years for customer lists and relationships; 17 – 20 years for patents and technology; and primarily 5 – 25 years for other. Amortization of other intangibles amounted to $25.1 million , $19.0 million and $16.9 million for the years ended December 31, 2017 , 2016 and 2015 , respectively. Included in amortization for the year ended December 31, 2017 and 2016 is $17.7 million and $15.9 million , respectively, of amortization using the pattern of economic benefit method. Amortization of other intangibles related to discontinued operations was $26.3 million and $60.4 million for the years ended December 31, 2016 and 2015 , respectively. Total estimated amortization expense of other intangibles for the next five fiscal years is as follows (in thousands): Estimated Amortization Expense 2018 $ 27,166 2019 $ 27,461 2020 $ 25,035 2021 $ 24,756 2022 $ 24,162

Accrued Expenses

Accrued Expenses	12 Months Ended
	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued Expenses	Accrued Expenses: Accrued expenses consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Employee benefits, payroll and related taxes $ 93,393 $ 92,478 Obligations in connection with acquisitions (a) — 47,082 Other (b) 174,943 182,605 Total (c) $ 268,336 $ 322,165 (a) As of December 31, 2016 included accruals related to net working capital amounts arising from the acquisition of the lithium business of Jiangli New Materials. (b) No individual component exceeds 5% of total current liabilities. (c) As of December 31, 2017, $0.8 million of Accrued expenses were classified as Liabilities held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

Long-Term Debt

Long-Term Debt	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt: Long-term debt consisted of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 1.875% Senior notes, net of unamortized discount and debt issuance costs of $3,971 at December 31, 2017 and $7,823 at December 31, 2016 463,575 719,617 3.00% Senior notes, net of unamortized discount and debt issuance costs of $1,286 at December 31, 2016 — 248,714 4.15% Senior notes, net of unamortized discount and debt issuance costs of $3,372 at December 31, 2017 and $3,859 at December 31, 2016 421,628 421,141 4.50% Senior notes, net of unamortized discount and debt issuance costs of $891 at December 31, 2017 and $2,380 at December 31, 2016 174,325 347,620 5.45% Senior notes, net of unamortized discount and debt issuance costs of $4,159 at December 31, 2017 and $4,313 at December 31, 2016 345,841 345,687 Commercial paper notes 421,321 247,503 Variable-rate foreign bank loans 5,298 38,939 Other 5,384 41 Total long-term debt 1,837,372 2,369,262 Less amounts due within one year 422,012 247,544 Long-term debt, less current portion $ 1,415,360 $ 2,121,718 Aggregate annual maturities of long-term debt as of December 31, 2017 are as follows (in millions): 2018 — $422.0 ; 2019 — $0.2 ; 2020 — $180.5 ; 2021 — $467.5 ; 2022 — $0.0 ; thereafter— $779.5 . Senior Notes In the fourth quarter of 2014, we issued a series of senior notes (collectively, the “2014 Senior Notes”) as follows: • €700.0 million aggregate principal amount of senior notes, issued on December 8, 2014, bearing interest at a rate of 1.875% payable annually on December 8 of each year, beginning in 2015. The effective interest rate on these senior notes is approximately 2.10% . These senior notes mature on December 8, 2021. • $250.0 million aggregate principal amount of senior notes, issued on November 24, 2014, bearing interest at a rate of 3.00% payable semi-annually on June 1 and December 1 of each year, beginning June 1, 2015. The effective interest rate on these senior notes is approximately 3.18% . These senior notes mature on December 1, 2019. • $425.0 million aggregate principal amount of senior notes, issued on November 24, 2014, bearing interest at a rate of 4.15% payable semi-annually on June 1 and December 1 of each year, beginning June 1, 2015. The effective interest rate on these senior notes is approximately 5.06% . These senior notes mature on December 1, 2024. • $350.0 million aggregate principal amount of senior notes, issued on November 24, 2014, bearing interest at a rate of 5.45% payable semi-annually on June 1 and December 1 of each year, beginning June 1, 2015. The effective interest rate on these senior notes is approximately 5.50% . These senior notes mature on December 1, 2044. Our $350.0 million aggregate principal amount of senior notes, issued on December 10, 2010, bear interest at a rate of 4.50% payable semi-annually on June 15 and December 15 of each year. The effective interest rate on these senior notes is approximately 4.70% . These senior notes mature on December 15, 2020. In the first quarter of 2017, using a portion of the proceeds from the sale of the Chemetall Surface Treatment business, we repaid the 3.00% Senior notes in full, €307.0 million of the 1.875% Senior notes and $174.7 million of the 4.50% Senior notes, as well as related tender premiums of $45.2 million . As a result, Interest and financing expenses on the consolidated statements of income i ncludes a loss on early extinguishment of debt of $52.8 million for the year ended December 31, 2017, representing the tender premiums, fees, unamortized discounts and unamortized deferred financing costs from the redemption of these senior notes. Upon completion of the Rockwood acquisition, we assumed Rockwood’s senior notes with an aggregate principal amount of $1.25 billion . Under the terms of the indenture governing the senior notes, as amended and supplemented, on October 15, 2015, our wholly-owned subsidiary, Rockwood Specialties Group, Inc., redeemed all of the outstanding Rockwood senior notes at a redemption price equal to 103.469% of the principal amount of the notes, representing a premium of $43.3 million , plus accrued and unpaid interest to the redemption date. The guarantees of these senior notes and the 2014 Senior Notes were released upon repayment of these senior notes. Included in Interest and financing expenses in our consolidated statements of income and Loss on early extinguishment of debt in our consolidated statements of cash flows for the year ended December 31, 2015 is a loss on early extinguishment of approximately $5.4 million related to these senior notes. Our $325.0 million aggregate principal amount of senior notes, which were issued on January 20, 2005 and bore interest at a rate of 5.10% , matured and were repaid on February 1, 2015. The effective interest rate on these senior notes was approximately 5.19% . On January 22, 2014, we entered into a pay fixed, receive variable rate forward starting interest rate swap, with a notional amount of $325.0 million , with J.P. Morgan Chase Bank, N.A., to be effective October 15, 2014. Our risk management objective and strategy for undertaking this hedge was to eliminate the variability in the interest rate and partial credit spread on the 20 future semi-annual coupon payments that we will pay in connection with our 4.15% senior notes. On October 15, 2014, the swap was settled, resulting in a payment to the counterparty of $33.4 million . This amount was recorded in Accumulated other comprehensive loss and is being amortized to interest expense over the life of the 4.15% senior notes. The amount to be reclassified to interest expense from Accumulated other comprehensive loss during the next twelve months is approximately $3.3 million . On December 18, 2014, the carrying value of the 1.875% Euro-denominated senior notes was designated as an effective hedge of our net investment in foreign subsidiaries where the Euro serves as the functional currency, and beginning on the date of designation, gains or losses on the revaluation of these senior notes to our reporting currency have been and will be recorded in Accumulated other comprehensive loss. During the years ended December 31, 2017 , 2016 and 2015 , (losses) gains of ($41.8) million , $26.1 million and $50.9 million (net of income taxes), respectively, were recorded in Accumulated other comprehensive loss in connection with the revaluation of these senior notes to our reporting currency. September 2015 Term Loan Agreement The senior notes we assumed from Rockwood were repaid with proceeds from a new term loan agreement we entered into on September 14, 2015 (the “September 2015 Term Loan Agreement”) with JPMorgan Chase Bank, N.A. (the “Administrative Agent”) and certain other lenders. The September 2015 Term Loan Agreement provided for borrowings under a 364-day term loan facility (the “364-Day Facility”) and a five-year term loan facility (the “Five-Year Facility”), or collectively, the “Term loan facilities.” During the year ended December 31, 2016, the Company repaid the 364-Day Facility and Five-Year Facility in full, primarily with proceeds from the sales of the Chemetall Surface Treatment business, the metal sulfides business and the minerals-based flame retardants and specialty chemicals business. The interest rate on both Term loan facilities was LIBOR plus 1.375% . Credit Agreement Our revolving, unsecured credit agreement dated as of February 7, 2014, as amended, (the “February 2014 Credit Agreement”) currently provides for borrowings of up to $1.0 billion and matures on February 7, 2020. Borrowings bear interest at variable rates based on the LIBOR for deposits in the relevant currency plus an applicable margin which ranges from 1.000% to 1.700% , depending on the Company’s credit rating from Standard & Poor’s Ratings Services (“S&P”), Moody’s Investors Services (“Moody’s”) and Fitch Ratings (“Fitch”). The applicable margin on the facility was 1.10% as of December 31, 2017 . There were no borrowings outstanding under the February 2014 Credit Agreement as of December 31, 2017 . Borrowings under the February 2014 Credit Agreement are conditioned upon compliance with the following covenants: (a) consolidated funded debt, as defined in the agreement, must be less than or equal to 3.50 times consolidated EBITDA, as defined in the agreement, (which reflects adjustments for certain non-recurring or unusual items such as acquisition and integration related costs, utilization of inventory markup, gains or losses on sales of businesses, restructuring charges, facility divestiture charges and other significant non-recurring items), or herein “consolidated adjusted EBITDA,” as of the end of any fiscal quarter; (b) with the exception of certain liens as specified in the agreement, liens may not attach to assets when the aggregate amount of all indebtedness secured by such liens plus unsecured subsidiary indebtedness, other than indebtedness incurred by our subsidiaries under the February 2014 Credit Agreement, would exceed 20% of consolidated net worth, as defined in the agreement; and (c) with the exception of certain indebtedness as specified in the agreement, subsidiary indebtedness may not exceed the difference between 20% of consolidated net worth, as defined in the agreement, and indebtedness secured by liens permitted under the agreement. Commercial Paper Notes On May 29, 2013, we entered into agreements to initiate a commercial paper program on a private placement basis under which we may issue unsecured commercial paper notes (the “Commercial Paper Notes”) from time-to-time up to a maximum aggregate principal amount outstanding at any time of $750.0 million . The proceeds from the issuance of the Commercial Paper Notes are expected to be used for general corporate purposes, including the repayment of other debt of the Company. Our February 2014 Credit Agreement is available to repay the Commercial Paper Notes, if necessary. Aggregate borrowings outstanding under the February 2014 Credit Agreement and the Commercial Paper Notes will not exceed the $1.0 billion current maximum amount available under the February 2014 Credit Agreement. The Commercial Paper Notes will be sold at a discount from par, or alternatively, will be sold at par and bear interest at rates that will vary based upon market conditions at the time of issuance. The maturities of the Commercial Paper Notes will vary but may not exceed 397 days from the date of issue. The definitive documents relating to the commercial paper program contain customary representations, warranties, default and indemnification provisions. Using a portion of the proceeds from the sale of the Chemetall Surface Treatment business, we repaid approximately $153 million of Commercial Paper Notes in December 2016. At December 31, 2017 , we had $421.3 million of Commercial Paper Notes outstanding bearing a weighted-average interest rate of approximately 1.80% and a weighted-average maturity of 36 days . August 2014 Term Loan Agreement and Cash Bridge Facility In 2014, we entered into bridge financing arrangements to fund a portion of the cash consideration for the Rockwood acquisition and pay related fees and expenses: (1) a term loan credit agreement providing for a tranche of senior unsecured term loan in an aggregate amount of $1.0 billion and (2) a senior unsecured cash bridge facility (the “Cash Bridge Facility”) pursuant to which the lenders thereunder would provide up to $1.15 billion in loans. In the first quarter of 2015, we borrowed and repaid $1.0 billion under the term loan credit agreement and $800.0 million under the senior unsecured cash bridge facility. The weighted-average interest rate on borrowings under the financing agreements were approximately 1.67% . In connection with bridge financing arrangements, structuring and underwriting fees of approximately $19.0 million were capitalized and expensed over the life of the facilities, $2.3 million of which is reflected in Other (expenses) income, net, in the consolidated statements of income for the year ended December 31, 2015. Financing Costs In 2015, we paid approximately $4.5 million of debt financing costs primarily related to the 2014 Senior Notes, the September 2015 Term Loan Agreement and amendments to the February 2014 Credit Agreement. Other We have additional uncommitted credit lines with various U.S. and foreign financial institutions that provide for borrowings of up to approximately $266 million at December 31, 2017 . Outstanding borrowings under these agreements were $5.3 million and $38.9 million at December 31, 2017 and 2016 , respectively. The average interest rate on borrowings under these agreements during 2017 , 2016 and 2015 was approximately 1.26% , 0.94% and 0.74% , respectively. At December 31, 2017 and 2016 , we had the ability and intent to refinance our borrowings under our other existing credit lines with borrowings under the February 2014 Credit Agreement. Therefore, the amounts outstanding under those credit lines, if any, are classified as long-term debt at December 31, 2017 and 2016 . At December 31, 2017 , we had the ability to borrow $578.7 million under our commercial paper program and the February 2014 Credit Agreement. We believe that as of December 31, 2017 , we were, and currently are, in compliance with all of our debt covenants.

Pension Plans and Other Postret

Pension Plans and Other Postretirement Benefits	12 Months Ended
	Dec. 31, 2017
Retirement Benefits [Abstract]
Pension Plans and Other Postretirement Benefits	Pension Plans and Other Postretirement Benefits: We maintain various noncontributory defined benefit pension plans covering certain employees, primarily in the U.S., the U.K., Germany and Japan. We also have a contributory defined benefit plan covering certain Belgian employees. The benefits for these plans are based primarily on compensation and/or years of service. Our U.S. and U.K. defined benefit plans for non-represented employees are closed to new participants, with no additional benefits accruing under these plans as participants’ accrued benefits have been frozen. The funding policy for each plan complies with the requirements of relevant governmental laws and regulations. The pension information for all periods presented includes amounts related to salaried and hourly plans. The following provides a reconciliation of benefit obligations, plan assets and funded status, as well as a summary of significant assumptions, for our defined benefit pension plans (in thousands): Year Ended December 31, 2017 Year Ended December 31, 2016 U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans Change in benefit obligations: Benefit obligation at January 1 $ 665,688 $ 246,280 $ 682,839 $ 245,747 Service cost 985 2,547 1,028 3,133 Interest cost 28,614 5,128 30,514 6,570 Actuarial loss 30,539 2,783 7,357 28,083 Benefits paid (39,863 ) (9,524 ) (56,050 ) (9,793 ) Divestitures — — — (6,372 ) Employee contributions — 215 — 245 Foreign exchange loss (gain) — 30,711 — (21,724 ) Settlements/curtailments — (3,065 ) — (427 ) Other — (69 ) — 818 Benefit obligation at December 31 $ 685,963 $ 275,006 $ 665,688 $ 246,280 Change in plan assets: Fair value of plan assets at January 1 $ 538,082 $ 68,875 $ 555,084 $ 64,911 Actual return on plan assets 80,613 6,260 37,725 12,534 Employer contributions 1,564 9,316 1,323 10,911 Benefits paid (39,863 ) (9,524 ) (56,050 ) (9,793 ) Employee contributions — 215 — 245 Foreign exchange gain (loss) — 7,470 — (10,492 ) Settlements/curtailments — (3,065 ) — — Other — (69 ) — 559 Fair value of plan assets at December 31 $ 580,396 $ 79,478 $ 538,082 $ 68,875 Funded status at December 31 $ (105,567 ) $ (195,528 ) $ (127,606 ) $ (177,405 ) December 31, 2017 December 31, 2016 U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans Amounts recognized in consolidated balance sheets: Current liabilities (accrued expenses) $ (1,267 ) $ (5,217 ) $ (1,100 ) $ (5,216 ) Noncurrent liabilities (pension benefits) (104,300 ) (190,311 ) (126,506 ) (172,189 ) Net pension liability $ (105,567 ) $ (195,528 ) $ (127,606 ) $ (177,405 ) Amounts recognized in accumulated other comprehensive (loss) income: Prior service benefit $ (60 ) $ (269 ) $ (136 ) $ (322 ) Net amount recognized $ (60 ) $ (269 ) $ (136 ) $ (322 ) Weighted-average assumptions used to determine benefit obligations at December 31: Discount rate 4.03 % 1.94 % 4.43 % 2.00 % Rate of compensation increase — % 3.18 % — % 3.18 % The accumulated benefit obligation for all defined benefit pension plans was $949.0 million and $901.4 million at December 31, 2017 and 2016 , respectively. Postretirement medical benefits and life insurance is provided for certain groups of U.S. retired employees. Medical and life insurance benefit costs have been funded principally on a pay-as-you-go basis. Although the availability of medical coverage after retirement varies for different groups of employees, the majority of employees who retire before becoming eligible for Medicare can continue group coverage by paying a portion of the cost of a monthly premium designed to cover the claims incurred by retired employees subject to a cap on payments allowed. The availability of group coverage for Medicare-eligible retirees also varies by employee group with coverage designed either to supplement or coordinate with Medicare. Retirees generally pay a portion of the cost of the coverage. Plan assets for retiree life insurance are held under an insurance contract and are reserved for retiree life insurance benefits. In 2005, the postretirement medical benefit available to U.S. employees was changed to provide that employees who are under age 50 as of December 31, 2005 would no longer be eligible for a company-paid retiree medical premium subsidy. Employees who are of age 50 and above as of December 31, 2005 and who retire after January 1, 2006 will have their retiree medical premium subsidy capped. Effective January 1, 2008, our medical insurance for certain groups of U.S. retired employees is now insured through a medical carrier. The following provides a reconciliation of benefit obligations, plan assets and funded status, as well as a summary of significant assumptions, for our postretirement benefit plans (in thousands): Year Ended December 31, 2017 2016 Other Postretirement Benefits Other Postretirement Benefits Change in benefit obligations: Benefit obligation at January 1 $ 56,141 $ 56,499 Service cost 121 115 Interest cost 2,340 2,483 Actuarial loss 2,008 1,529 Benefits paid (3,963 ) (4,485 ) Benefit obligation at December 31 $ 56,647 $ 56,141 Change in plan assets: Fair value of plan assets at January 1 $ 2,232 $ 3,292 Actual return on plan assets 104 442 Employer contributions 2,461 2,983 Benefits paid (3,963 ) (4,485 ) Fair value of plan assets at December 31 $ 834 $ 2,232 Funded status at December 31 $ (55,813 ) $ (53,909 ) December 31, 2017 2016 Other Postretirement Benefits Other Postretirement Benefits Amounts recognized in consolidated balance sheets: Current liabilities (accrued expenses) $ (3,810 ) $ (3,371 ) Noncurrent liabilities (postretirement benefits) (52,003 ) (50,538 ) Net postretirement liability $ (55,813 ) $ (53,909 ) Amounts recognized in accumulated other comprehensive (loss) income: Prior service benefit $ 48 $ 143 Net amount recognized $ 48 $ 143 Weighted-average assumptions used to determine benefit obligations at December 31: Discount rate 3.99 % 4.35 % Rate of compensation increase 3.50 % 3.50 % The components of pension benefits (credit) cost from continuing operations are as follows (in thousands): Year Ended Year Ended Year Ended December 31, 2017 December 31, 2016 December 31, 2015 U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans Service cost $ 985 $ 2,547 $ 1,028 $ 3,133 $ 1,233 $ 3,909 Interest cost 28,614 5,128 30,514 6,570 30,235 6,405 Expected return on assets (36,243 ) (4,441 ) (36,445 ) (4,027 ) (40,495 ) (3,670 ) Actuarial (gain) loss (13,910 ) 483 5,988 19,418 2,665 (27,043 ) Amortization of prior service benefit 75 56 75 859 75 43 Total net pension benefits (credit) cost (a) $ (20,479 ) $ 3,773 $ 1,160 $ 25,953 $ (6,287 ) $ (20,356 ) Weighted-average assumption percentages: Discount rate 4.43 % 2.00 % 4.67 % 2.76 % 4.19 % 2.22 % Expected return on plan assets 6.89 % 6.16 % 6.89 % 6.66 % 6.88 % 5.76 % Rate of compensation increase — % 3.18 % — % 3.16 % — % 3.15 % (a) For the years ended December 31, 2016 and 2015, $10.8 million and $6.2 million , respectively, of net pension benefits credit is included in Income from discontinued operations (net of tax) in the consolidated statements of income. See Note 3, “Divestitures,” for additional information. Effective January 1, 2018 , the weighted-average expected rate of return on plan assets for the U.S. and foreign defined benefit pension plans is 6.89% and 5.52% , respectively. The estimated amounts to be amortized from accumulated other comprehensive loss into net periodic pension costs during 2018 are as follows (in thousands): U.S. Pension Plans Foreign Pension Plans Amortization of prior service benefit $ 60 $ 40 The components of postretirement benefits cost (credit) from continuing operations are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Other Postretirement Benefits Other Postretirement Benefits Other Postretirement Benefits Service cost $ 121 $ 115 $ 137 Interest cost 2,340 2,483 2,573 Expected return on assets (110 ) (187 ) (263 ) Actuarial loss (gain) 2,014 1,275 (5,707 ) Amortization of prior service benefit (95 ) (95 ) (95 ) Total net postretirement benefits cost (credit) (a) $ 4,270 $ 3,591 $ (3,355 ) Weighted-average assumption percentages: Discount rate 4.35 % 4.59 % 4.15 % Expected return on plan assets 7.00 % 7.00 % 7.00 % Rate of compensation increase 3.50 % 3.50 % 3.50 % (a) For the year ended December 31, 2015, $2.6 million of net postretirement benefits credit is included in Income from discontinued operations (net of tax) in the consolidated statements of income. See Note 3, “Divestitures,” for additional information. Effective January 1, 2018 , the weighted-average expected rate of return on plan assets for our postretirement benefit plans is 7.00% . The estimated amounts to be amortized from accumulated other comprehensive loss into net periodic postretirement costs during 2018 are as follows (in thousands): Other Postretirement Benefits Amortization of prior service benefit $ (48 ) Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The inputs used to measure fair value are classified into the following hierarchy: Level 1 Unadjusted quoted prices in active markets for identical assets or liabilities Level 2 Unadjusted quoted prices in active markets for similar assets or liabilities, or unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability Level 3 Unobservable inputs for the asset or liability We endeavor to utilize the best available information in measuring fair value. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Transfers between levels of the fair value hierarchy are deemed to have occurred on the date of the event or change in circumstance that caused the transfer. There were no transfers between Levels 1 and 2 during the year ended December 31, 2017 . Investments for which market quotations are readily available are valued at the closing price on the last business day of the year. Listed securities for which no sale was reported on such date are valued at the mean between the last reported bid and asked price. Securities traded in the over-the-counter market are valued at the closing price on the last business day of the year or at bid price. The net asset value of shares or units is based on the quoted market value of the underlying assets. The market value of corporate bonds is based on institutional trading lots and is most often reflective of bid price. Government securities are valued at the mean between bid and ask prices. Holdings in private equity securities are typically valued using the net asset valuations provided by the underlying private investment companies. The following tables set forth the assets of our pension and postretirement plans that were accounted for at fair value on a recurring basis as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Pension Assets: Domestic Equity (a) $ 163,160 $ 160,976 $ 2,184 $ — International Equity (b) 130,935 101,366 29,569 — Fixed Income (c) 269,365 231,506 37,859 — Absolute Return Measured at Net Asset Value (d) 96,414 — — — Total Pension Assets $ 659,874 $ 493,848 $ 69,612 $ — Postretirement Assets: Fixed Income (c) $ 834 $ — $ 834 $ — December 31, 2016 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Pension Assets: Domestic Equity (a) $ 146,683 $ 143,987 $ 2,696 $ — International Equity (b) 116,649 83,839 32,810 — Fixed Income (c) 255,401 230,309 25,092 — Absolute Return Measured at Net Asset Value (d) 86,112 — — — Cash 2,112 2,112 — — Total Pension Assets $ 606,957 $ 460,247 $ 60,598 $ — Postretirement Assets: Fixed Income (c) $ 2,232 $ — $ 2,232 $ — (a) Consists primarily of U.S. stock funds that track or are actively managed and measured against the S&P 500 index. (b) Consists primarily of international equity funds which invest in common stocks and other securities whose value is based on an international equity index or an underlying equity security or basket of equity securities. (c) Consists primarily of debt obligations issued by governments, corporations, municipalities and other borrowers. Also includes insurance policies. (d) Consists primarily of funds with holdings in private investment companies. See additional information about the Absolute Return investments below. Holdings in private investment companies are measured at fair value using the net asset value per share as a practical expedient and have not been categorized in the fair value hierarchy. The fair value amounts of $96.4 million and $86.1 million as of December 31, 2017 and 2016, respectively, are included in this table to permit reconciliation to the reconciliation of plan assets table above. The Company’s pension plan assets in the U.S. and U.K. represent approximately 98% of the total pension plan assets. The investment objective of these pension plan assets is to achieve solid returns while preserving capital to meet current plan cash flow requirements. Assets should participate in rising markets, with defensive action in declining markets expected to an even greater degree. Depending on market conditions, the broad asset class targets may range up or down by approximately 10% . These asset classes include but are not limited to hedge fund of funds, bonds and other fixed income vehicles, high yield fixed income securities, equities and distressed debt. At December 31, 2017 and 2016 , equity securities held by our pension and OPEB plans did not include direct ownership of Albemarle common stock. The weighted-average target allocations as of the measurement date are as follows: Target Allocation Equity securities 43 % Fixed income 44 % Absolute return 13 % Our Absolute Return investments consist primarily of our investments in hedge fund of funds. These are holdings in private investment companies with fair values that are based on significant unobservable inputs including assumptions where there is little, if any, market activity for the investment. Investment managers or fund managers associated with these investments provide valuations of the investments on a monthly basis utilizing the net asset valuation approach for determining fair values. These valuations are reviewed by the Company for reasonableness based on applicable sector, benchmark and company performance to validate the appropriateness of the net asset values as a fair value measurement. Where available, audited financial statements are obtained and reviewed for the investments as support for the manager’s investment valuation. In general, the investment objective of these funds is high risk-adjusted returns with an emphasis on preservation of capital. The investment strategies of each of the funds vary; however, the objective of our Absolute Return investments is complementary to the overall investment objective of our U.S. pension plan assets. We made contributions to our defined benefit pension and OPEB plans of $13.3 million , $20.1 million and $21.6 million during the years ended December 31, 2017 , 2016 and 2015 , respectively, related to continuing and discontinued operations. We expect contributions to our domestic nonqualified and foreign qualified and nonqualified pension plans to approximate $13 million in 2018 . Also, we expect to pay approximately $3 million in premiums to our U.S. postretirement benefit plan in 2018 . However, we may choose to make additional voluntary pension contributions in excess of these amounts. The current forecast of benefit payments, which reflects expected future service, amounts to (in millions): U.S. Pension Plans Foreign Pension Plans Other Postretirement Benefits 2018 $ 41.2 $ 13.9 $ 4.6 2019 $ 43.2 $ 9.1 $ 4.4 2020 $ 43.9 $ 10.2 $ 4.2 2021 $ 44.3 $ 10.8 $ 3.9 2022 $ 44.6 $ 10.0 $ 3.9 2023-2027 $ 224.2 $ 59.0 $ 18.2 We have a supplemental executive retirement plan (“SERP”), which provides unfunded supplemental retirement benefits to certain management or highly compensated employees. The SERP provides for incremental pension benefits to offset the limitations imposed on qualified plan benefits by federal income tax regulations. Costs (credits) relating to our SERP were $2.6 million , $1.6 million and ($2.1) million for the years ended December 31, 2017 , 2016 and 2015 , respectively. The projected benefit obligation for the SERP recognized in the consolidated balance sheets at December 31, 2017 and 2016 was $24.8 million and $23.5 million , respectively. The benefit expenses and obligations of this SERP are included in the tables above. Benefits of $1.3 million are expected to be paid to SERP retirees in 2018 . On October 1, 2012, our Board of Directors approved amendments to the SERP, such that effective December 31, 2014, no additional benefits shall accrue under this plan and participants’ accrued benefits shall be frozen as of that date to reflect the same changes as were made under the U.S. qualified defined benefit plan. At December 31, 2017 , the assumed rate of increase in the pre-65 and post-65 per capita cost of covered health care benefits for U.S. retirees was zero as the employer-paid premium caps (pre-65 and post-65) were met starting January 1, 2013. Defined Contribution Plans On March 31, 2004, a new defined contribution pension plan benefit was adopted under the qualified defined contribution plan for U.S. non-represented employees hired after March 31, 2004. On October 1, 2012 our Board of Directors approved certain plan amendments, such that effective January 1, 2013, the defined contribution pension plan benefit is expanded to include non-represented employees hired prior to March 31, 2004, and revised the contribution for all participants to be based on 5% of eligible employee compensation. The employer portion of contributions to our U.S. defined contribution pension plan amounted to $10.3 million , $15.1 million , and $12.8 million in 2017 , 2016 and 2015 , respectively, related to continuing and discontinued operations. Certain of our employees participate in our defined contribution 401(k) employee savings plan, which is generally available to all U.S. full-time salaried and non-union hourly employees and to employees who are covered by a collective bargaining agreement that provides for such participation. This U.S. defined contribution plan is funded with contributions made by the participants and us. Our contributions to the 401(k) plan amounted to $11.3 million , $12.7 million and $11.7 million in 2017 , 2016 and 2015 , respectively, related to continuing and discontinued operations. Contributions for 2015 include our contributions to Rockwood’s former 401(k) plan which was merged into Albemarle’s 401(k) plan effective December 1, 2015. In 2006, we formalized a new plan in the Netherlands similar to a collective defined contribution plan. The collective defined contribution plan is supported by annuity contracts through an insurance company. The insurance company unconditionally undertakes the legal obligation to provide specific benefits to specific individuals in return for a fixed amount of premiums. Our obligation under this plan is limited to a variable calculated employer match for each participant plus an additional fixed amount of contributions to assist in covering estimated cost of living and salary increases (indexing) and administrative costs for the overall plan. We paid approximately $9.9 million , $9.5 million and $7.2 million in 2017 , 2016 and 2015 , respectively, in annual premiums and related costs pertaining to this plan. Multiemployer Plan Certain current and former employees participate in a multiemployer plan in Germany, the Pensionskasse Dynamit Nobel Versicherungsverein auf Gegenseitigkeit, Troisdorf (“DN Pensionskasse”), that provides monthly payments in the case of disability, death or retirement. The risks of participating in a multiemployer plan are different from single-employer plans in the following ways: (a) assets contributed to the multiemployer plan by one employer may be used to provide benefits to employees of other participating employers, and (b) if a participating employer stops contributing to the plan, the unfunded obligation of the plan may be borne by remaining participating employers. Some participants in the plan are subject to collective bargaining arrangements, which have no fixed expiration date. The contribution and benefit levels are not negotiated or significantly influenced by these collective bargaining arrangements. Also, the benefit levels generally are not subject to reduction. Under German insurance law, the DN Pensionskasse must be fully funded at all times. The DN Pensionskasse was fully funded as of December 31, 2016 , the date of the most recently available information for the plan. This funding level would correspond to the highest funding zone status (at least 80% funded) under U.S. pension regulation. Since the plan liabilities need to be fully funded at all times according to local funding requirements, it is unlikely that the DN Pensionskasse plan will fail to fulfill its obligations, however, in such an event, the Company is liable for the benefits of its employees who participate in the plan. Additional information of the DN Pensionskasse is available in the public domain. The majority of the Company’s contributions are tied to employees’ contributions, which are generally calculated as a percentage of base compensation, up to a certain statutory ceiling. Our normal contributions to this plan for continuing operations were approximately $1.5 million , $1.7 million and $1.8 million in 2017 , 2016 and 2015 , respectively. Contributions for discontinued operations were approximately $1.3 million in 2016 and 2015 . The Company’s contributions represented more than 5% of total contributions to the DN Pensionskasse in 2017 . Effective July 1, 2016, the DN Pensionskasse is subject to a financial improvement plan which expires on December 31, 2022, with the final contribution in the second quarter of 2023. This financial improvement plan calls for increased capital reserves to avoid future underfunding risk. During the year ended December 31, 2017, we made contributions for our employees covered under this plan of approximately $3.3 million , recorded in Selling, general and administrative expenses, as a result of this financial improvement plan. In addition, during the year ended December 31, 2017, we made contributions relating to this financial improvement plan to indemnify previously divested businesses of approximately $4.6 million , recorded in Other (expenses) income, net. The value of the additional funding required under the financial improvement plan each year is determined upon the completion of the annual financial statements and are payable in the second quarter of the following year. A portion of the additional funding necessary for the year will be based on an estimate prepared on September 30 of each year and payable in the fourth quarter of that same year.

Other Noncurrent Liabilities

Other Noncurrent Liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Other Noncurrent Liabilities	Other Noncurrent Liabilities: Other noncurrent liabilities consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Transition tax on foreign earnings (a) $ 394,878 $ — Liabilities related to uncertain tax positions (b) 24,369 27,919 Executive deferred compensation plan obligation 25,494 22,037 Environmental liabilities (c) 37,518 32,595 Asset retirement obligations (c) 40,450 36,296 Tax indemnification liability (d) 42,707 38,255 Other (e) 33,758 37,708 Total (f) $ 599,174 $ 194,810 (a) Noncurrent portion of one-time transition tax on foreign earnings. See Note 20, “Income Taxes,” for additional information. (b) See Note 20, “Income Taxes.” (c) See Note 17, “Commitments and Contingencies.” (d) Indemnification of certain income and non-income tax liabilities associated with the Chemetall Surface Treatment entities sold. (e) No individual component exceeds 5% of total liabilities. (f) As of December 31, 2017, $0.6 million of Other noncurrent liabilities were classified as Liabilities held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies: In the ordinary course of business, we have commitments in connection with various activities. We believe that amounts recorded are adequate for known items which might become due in the current year. The most significant commitments are as follows: Environmental We had the following activity in our recorded environmental liabilities for the years ended December 31, 2017 , 2016 and 2015 (in thousands): Year Ended December 31, 2017 2016 2015 Balance, beginning of year $ 34,919 $ 31,436 $ 9,235 Expenditures (1,818 ) (2,667 ) (4,039 ) Acquisition of Rockwood — — 34,626 Divestitures — — (1,826 ) Accretion of discount 896 793 902 Additions and revisions of estimates 3,344 4,004 150 Reclass to liabilities held for sale (a) — — (5,253 ) Foreign currency translation adjustments and other 2,467 1,353 (2,359 ) Balance, end of year 39,808 34,919 31,436 Less amounts reported in Accrued expenses 2,290 2,324 1,443 Amounts reported in Other noncurrent liabilities $ 37,518 $ 32,595 $ 29,993 (a) Represents environmental liabilities of the metal sulfides and minerals-based flame retardants and specialty chemicals businesses. See Note 3, “Divestitures,” for additional information. Environmental remediation liabilities included discounted liabilities of $28.1 million and $22.8 million at December 31, 2017 and 2016 , respectively, discounted at rates with a weighted-average of 3.6% and 3.5% , respectively, with the undiscounted amount totaling $68.2 million and $61.1 million at December 31, 2017 and 2016 , respectively. For certain locations where the Company is operating groundwater monitoring and/or remediation systems, prior owners or insurers have assumed all or most of the responsibility. The amounts recorded represent our future remediation and other anticipated environmental liabilities. These liabilities typically arise during the normal course of our operational and environmental management activities or at the time of acquisition of the site, and are based on internal analysis as well as input from outside consultants. As evaluations proceed at each relevant site, changes in risk assessment practices, remediation techniques and regulatory requirements can occur, therefore such liability estimates may be adjusted accordingly. The timing and duration of remediation activities at these sites will be determined when evaluations are completed. Although it is difficult to quantify the potential financial impact of these remediation liabilities, management estimates (based on the latest available information) that there is a reasonable possibility that future environmental remediation costs associated with our past operations, in excess of amounts already recorded, could be up to approximately $18 million before income taxes. We believe that any sum we may be required to pay in connection with environmental remediation matters in excess of the amounts recorded would likely occur over a period of time and would likely not have a material adverse effect upon our results of operations, financial condition or cash flows on a consolidated annual basis although any such sum could have a material adverse impact on our results of operations, financial condition or cash flows in a particular quarterly reporting period. Asset Retirement Obligations The following is a reconciliation of our beginning and ending asset retirement obligation balances for 2017 and 2016 (in thousands): Year Ended December 31, 2017 2016 Balance, beginning of year $ 36,296 $ 37,230 Additions and revisions of estimates 3,859 — Accretion of discount 1,532 1,354 Liabilities settled (789 ) (370 ) Foreign currency translation adjustments and other (448 ) (1,918 ) Balance, end of year $ 40,450 $ 36,296 Our asset retirement obligations are recorded in Other noncurrent liabilities in the consolidated balance sheets. Asset retirement obligations primarily relate to post-closure reclamation of brine wells and sites involved in the surface mining and manufacturing of lithium. We are not aware of any conditional asset retirement obligations that would require recognition in our consolidated financial statements. Rental Expense Our rental expenses include a number of operating lease agreements, primarily for office space, transportation equipment and storage facilities. The following schedule details the future non-cancelable minimum lease payments for the next five years and thereafter (in thousands): Operating Leases 2018 $ 27,576 2019 $ 25,609 2020 $ 24,184 2021 $ 23,722 2022 $ 21,476 Thereafter $ 20,220 Rental expense was approximately $31.2 million , $31.4 million , and $34.8 million for 2017 , 2016 and 2015 , respectively. Rental expense related to discontinued operations was approximately $11.8 million and $10.2 million for 2016 and 2015 , respectively. Rental expense is shown net of sublease income which was minimal during 2017 , 2016 and 2015 . Litigation We are involved from time to time in legal proceedings of types regarded as common in our business, including administrative or judicial proceedings seeking remediation under environmental laws, such as the federal Comprehensive Environmental Response, Compensation and Liability Act, commonly known as CERCLA or Superfund, products liability, breach of contract liability and premises liability litigation. Where appropriate, we may establish financial reserves for such proceedings. We also maintain insurance to mitigate certain of such risks. Costs for legal services are generally expensed as incurred. Following receipt of information regarding potential improper payments being made by third party sales representatives of our Refining Solutions business, we promptly retained outside counsel and forensic accountants to investigate potential violations of the Company’s Code of Conduct, the Foreign Corrupt Practices Act (“FCPA”), and other potentially applicable laws. Based on this internal investigation, we have voluntarily self-reported potential issues relating to the use of third party sales representatives in our Refining Solutions business to the U.S. Department of Justice (“DOJ”) and Securities and Exchange Commission (“SEC”), and intend to cooperate with the DOJ and SEC in their review of these matters. In connection with our internal investigation, we have implemented, and are continuing to implement, appropriate remedial measures. At this time, we are unable to predict the duration, scope, result or related costs associated with any investigations by the DOJ or SEC. We also are unable to predict what, if any, action may be taken by the DOJ or SEC or what penalties or remedial actions they may seek. Any determination that our operations or activities are not in compliance with existing laws or regulations, however, could result in the imposition of fines, penalties, disgorgement, equitable relief, or other losses. We do not believe, however, that any fines, penalties, disgorgement, equitable relief or other losses would have a material adverse effect on our financial condition or liquidity. Indemnities We are indemnified by third parties in connection with certain matters related to acquired and divested businesses. Although we believe that the financial condition of those parties who may have indemnification obligations to the Company is generally sound, in the event the Company seeks indemnity under any of these agreements or through other means, there can be no assurance that any party who may have obligations to indemnify us will adhere to their obligations and we may have to resort to legal action to enforce our rights under the indemnities. The Company may be subject to indemnity claims relating to properties or businesses it divested, including properties or businesses of acquired businesses that were divested prior to the completion of the acquisition. In the opinion of management, and based upon information currently available, the ultimate resolution of any indemnification obligations owed to the Company or by the Company is not expected to have a material effect on the Company’s financial condition, results of operations or cash flows. See Note 16, “Other Noncurrent Liabilities,” for the tax indemnification liability related to the sale of the Chemetall Surface Treatment business. Other The Company has standby letters of credit and guarantees with various financial institutions. The following table summarizes our letters of credit and guarantee agreements (in thousands): 2018 2019 2020 2021 2022 Thereafter Letters of credit and other guarantees $ 40,347 $ 5,830 $ 1,672 $ 975 $ 1,074 $ 13,581 The outstanding letters of credit are primarily related to insurance claim payment guarantees with expiration dates ranging from 2018 to 2022 . The majority of the Company’s other guarantees have terms of one year and mainly consist of performance and environmental guarantees, as well as guarantees to customs and port authorities. The guarantees arose during the ordinary course of business. We do not have recorded reserves for the letters of credit and guarantees as of December 31, 2017 . We are unable to estimate the maximum amount of the potential future liability under guarantees and letters of credit. However, we accrue for any potential loss for which we believe a future payment is probable and a range of loss can be reasonably estimated. We believe our liability under such obligations is immaterial. We currently, and are from time to time, subject to transactional audits in various taxing jurisdictions and to customs audits globally. We do not expect the financial impact of any of these audits to have a material adverse effect on the Company’s results of operations, financial condition or cash flows.

Stock-based Compensation Expens

Stock-based Compensation Expense	12 Months Ended
	Dec. 31, 2017
Share-based Compensation [Abstract]
Stock-based Compensation Expense	Stock-based Compensation Expense: Incentive Plans We have various share-based compensation plans that authorize the granting of (i) stock options to purchase shares of our common stock, (ii) restricted stock and restricted stock units, (iii) performance unit awards and (iv) stock appreciation rights (“SARs”) to employees and non-employee directors. The plans provide for payment of incentive awards in one or more of the following at our option: cash, shares of our common stock, qualified and non-qualified stock options, SARs, restricted stock awards, restricted stock unit awards and performance unit awards. The share-based awards granted by us generally contain vesting provisions ranging from one to five years , and with respect to stock options granted by us, have a term of not more than ten years from the date of grant. Stock options granted to employees generally vest over three years and have a term of ten years . Restricted stock and restricted stock unit awards vest in periods ranging from one to five years from the date of grant. Performance unit awards are earned at a level ranging from 0% to 200% contingent upon the achievement of specific performance criteria over periods ranging from one to three years . Distribution of earned units occurs generally 50% upon completion of the applicable measurement period with the remaining 50% distributed one year thereafter. We granted 82,204 , 141,661 and 313,803 stock options during 2017 , 2016 and 2015 , respectively. There were no significant modifications made to any share-based grants during these periods. On April 20, 2010, the maximum number of shares available for issuance to participants under the Albemarle Corporation 2008 Incentive Plan (the “Incentive Plan”) increased by 4,470,000 shares to 7,470,000 shares. With respect to any awards, other than stock options or SARs, the number of shares available for awards under the Incentive Plan were reduced by 1.6 shares for each share covered by such award or to which such award related. Effective May 7, 2013, the Albemarle Corporation 2008 Stock Compensation Plan for Non-Employee Directors and the 1996 Directors’ Deferred Compensation Plan (as amended and restated in 2005) were merged into the Albemarle Corporation 2013 Stock Compensation and Deferral Election Plan for Non-Employee Directors (the “Non-Employee Directors Plan”). Under the Non-Employee Directors Plan, a maximum aggregate number of 500,000 shares of our common stock is authorized for issuance to the Company’s non-employee directors; any shares remaining available for issuance under the prior plans were canceled. The aggregate fair market value of shares that may be issued to a director during any compensation year (as defined in the agreement, generally July 1 to June 30) shall not exceed $150,000 . At December 31, 2017 , there were 1,873,159 shares available for grant under the Incentive Plan and 408,591 shares available for grant under the Non-Employee Directors Plan. Total stock-based compensation expense associated with our incentive plans for the years ended December 31, 2017 , 2016 and 2015 amounted to $19.4 million , $17.0 million and $15.2 million , respectively, and is included in Cost of goods sold and SG&A expenses in the consolidated statement s of income. Total related recognized tax benefits for the years ended December 31, 2017 , 2016 and 2015 amounted to $7.0 million , $6.2 million and $5.6 million , respectively. As a result of the sale of the Chemetall Surface Treatment business, we converted previously granted incentive awards owed to Chemetall employees to a cash liability to be paid on the original vesting dates of the awards. The Company recognized expense of $5.8 million , included in Income from discontinued operations for the year ended December 31, 2016 related to these awards. At December 31, 2017, $2.3 million and $3.4 million of this cash liability were included in Accrued liabilities and Other noncurrent liabilities, respectively. The following table summarizes information about the Company’s fixed-price stock options as of and for the year ended December 31, 2017 : Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2016 1,542,244 $ 51.85 5.5 $ 52,798 Granted 82,204 92.93 Exercised (210,432 ) 39.15 Forfeited (12,298 ) 59.05 Outstanding at December 31, 2017 1,401,718 $ 56.10 5.1 $ 100,632 Exercisable at December 31, 2017 768,436 $ 50.35 3.3 $ 59,585 The fair value of each option granted during the years ended December 31, 2017 , 2016 and 2015 was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions: Year Ended December 31, 2017 2016 2015 Dividend yield 1.56 % 1.84 % 1.80 % Volatility 32.70 % 33.08 % 32.92 % Average expected life (years) 6 6 6 Risk-free interest rate 2.51 % 1.96 % 2.17 % Fair value of options granted $ 27.99 $ 16.06 $ 16.04 Dividend yield is the average of historical yields and those estimated over the average expected life. The stock volatility is based on historical volatilities of our common stock. The average expected life represents the weighted average period of time that options granted are expected to be outstanding giving consideration to vesting schedules and our historical exercise patterns. The risk-free interest rate is based on the U.S. Treasury strip rate with stripped coupon interest for the period equal to the contractual term of the share option grant in effect at the time of grant. The intrinsic value of options exercised during the years ended December 31, 2017 , 2016 and 2015 was $15.6 million , $7.9 million and $0.5 million , respectively. The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option. Total compensation cost not yet recognized for nonvested stock options outstanding as of December 31, 2017 is approximately $5.0 million and is expected to be recognized over a remaining weighted-average period of 1.6 years. Cash proceeds from stock options exercised and tax benefits related to stock options exercised were $8.2 million and $5.7 million for the year ended December 31, 2017 , respectively. The Company issues new shares of common stock upon exercise of stock options and vesting of restricted common stock awards. The following table summarizes activity in performance unit awards as of and for the year ended December 31, 2017 : Shares Weighted-Average Grant Date Fair Value Per Share Nonvested, beginning of period 494,691 $ 66.42 Granted 82,396 116.43 Vested (131,374 ) 67.59 Forfeited (12,710 ) 67.36 Nonvested, end of period 433,003 75.55 The weighted average grant date fair value of performance unit awards granted in 2017 , 2016 and 2015 was $9.6 million , $10.9 million and $11.9 million , respectively. The weighted average fair value of performance unit awards that vested during 2017 , 2016 and 2015 was $11.9 million , $4.6 million and $2.5 million , respectively, based on the closing prices of our common stock on the dates of vesting. Total compensation cost not yet recognized for nonvested performance unit awards outstanding as of December 31, 2017 is approximately $11.5 million , calculated based on current expectation of specific performance criteria, and is expected to be recognized over a remaining weighted-average period of approximately 1.1 years. Each performance unit represents one share of common stock. The following table summarizes activity in non-performance based restricted stock and restricted stock unit awards as of and for the year ended December 31, 2017 : Shares Weighted-Average Grant Date Fair Value Per Share Nonvested, beginning of period 180,656 $ 57.99 Granted 84,528 97.49 Vested (32,675 ) 63.45 Forfeited (9,171 ) 60.17 Nonvested, end of period 223,338 71.95 The weighted average grant date fair value of restricted stock and restricted stock unit awards granted in 2017 , 2016 and 2015 was $8.2 million , $8.8 million and $3.5 million , respectively. The weighted average fair value of restricted stock and restricted stock unit awards that vested in 2017 , 2016 and 2015 was $3.1 million , $3.2 million and $2.2 million , respectively, based on the closing prices of our common stock on the dates of vesting. Total compensation cost not yet recognized for nonvested, non-performance based restricted stock and restricted stock units as of December 31, 2017 is approximately $9.7 million and is expected to be recognized over a remaining weighted-average period of 2.1 years. The fair value of the non-performance based restricted stock and restricted stock units was estimated on the date of grant adjusted for a dividend factor, if necessary.

Accumulated Other Comprehensive

Accumulated Other Comprehensive (Loss) Income	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income: The components and activity in Accumulated other comprehensive (loss) income (net of deferred income taxes) consisted of the following during the years ended December 31, 2017 , 2016 and 2015 (in thousands): Foreign Currency Translation (a) Pension and Post-Retirement Benefits (b) Net Investment Hedge Interest Rate Swap (c) Total Accumulated other comprehensive (loss) income - balance at December 31, 2014 $ (52,835 ) $ — $ 11,384 $ (20,962 ) $ (62,413 ) Other comprehensive (loss) income before reclassifications (412,997 ) (774 ) 50,861 — (362,910 ) Amounts reclassified from accumulated other comprehensive loss 27 16 — 2,101 2,144 Other comprehensive (loss) income, net of tax (412,970 ) (758 ) 50,861 2,101 (360,766 ) Other comprehensive loss attributable to noncontrolling interests 1,891 — — — 1,891 Accumulated other comprehensive (loss) income - balance at December 31, 2015 $ (463,914 ) $ (758 ) $ 62,245 $ (18,861 ) $ (421,288 ) Other comprehensive (loss) income before reclassifications (102,246 ) — 26,133 — (76,113 ) Amounts reclassified from accumulated other comprehensive loss 81,421 834 — 2,116 84,371 Other comprehensive (loss) income, net of tax (20,825 ) 834 26,133 2,116 8,258 Other comprehensive loss attributable to noncontrolling interests 618 — — — 618 Accumulated other comprehensive (loss) income - balance at December 31, 2016 $ (484,121 ) $ 76 $ 88,378 $ (16,745 ) $ (412,412 ) Other comprehensive income (loss) before reclassifications 227,439 — (41,827 ) — 185,612 Amounts reclassified from accumulated other comprehensive loss — (97 ) — 2,116 2,019 Other comprehensive income (loss), net of tax 227,439 (97 ) (41,827 ) 2,116 187,631 Other comprehensive income attributable to noncontrolling interests (887 ) — — — (887 ) Accumulated other comprehensive (loss) income - balance at December 31, 2017 $ (257,569 ) $ (21 ) $ 46,551 $ (14,629 ) $ (225,668 ) (a) Amount reclassified from accumulated other comprehensive loss for the year ended December 31, 2016 is included in Income from discontinued operations (net of tax) for the year ended December 31, 2016 and resulted from the release of cumulative foreign currency translation adjustments into earnings upon the sale of our Chemetall Surface Treatment business which closed on December 14, 2016. See Note 3, “Divestitures,” for additional information. (b) The pre-tax portion of amounts reclassified from accumulated other comprehensive loss consists of amortization of prior service benefit, which is a component of pension and postretirement benefits (credit) cost. See Note 15, “Pension Plans and Other Postretirement Benefits,” for additional information. (c) The pre-tax portion of amounts reclassified from accumulated other comprehensive loss is included in interest expense. The amount of income tax (expense) benefit allocated to each component of Other comprehensive income (loss) for the years ended December 31, 2017 , 2016 and 2015 is provided in the following tables (in thousands): Foreign Currency Translation Pension and Postretirement Benefits Net Investment Hedge Interest Rate Swap 2017 Other comprehensive income (loss), before tax $ 228,508 $ (96 ) $ (65,958 ) $ 3,336 Income tax (expense) benefit (1,069 ) (1 ) 24,131 (1,220 ) Other comprehensive income (loss), net of tax $ 227,439 $ (97 ) $ (41,827 ) $ 2,116 2016 Other comprehensive (loss) income, before tax $ (20,849 ) $ 839 $ 41,209 $ 3,336 Income tax benefit (expense) 24 (5 ) (15,076 ) (1,220 ) Other comprehensive (loss) income, net of tax $ (20,825 ) $ 834 $ 26,133 $ 2,116 2015 Other comprehensive (loss) income, before tax $ (451,762 ) $ (751 ) $ 80,746 $ 3,336 Income tax benefit (expense) 38,792 (7 ) (29,885 ) (1,235 ) Other comprehensive (loss) income, net of tax $ (412,970 ) $ (758 ) $ 50,861 $ 2,101

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes: On December 22, 2017, the TCJA was signed into law in the U.S. The TCJA contains several key tax provisions including, among other things, the reduction of the corporate income tax rate from 35% to 21% effective January 1, 2018, the requirement of companies to pay a one-time transition tax on earnings of certain foreign subsidiaries that were previously tax deferred, and the creation of new taxes on certain foreign sourced earnings such as global intangible low-taxed income (“GILTI”). Subsequent to December 31, 2017 the U.S. Department of the Treasury has issued additional interpretive guidance on the application of the rules around the one-time transition tax. The Company has incorporated guidance in all material respects issued through January 31, 2018, however, any additional guidance issued after this date has not been incorporated into the provisional estimate as the Company is still evaluating its impact. Under ASC 740, Income Taxes , the effect of changes in tax rates and laws are recognized in the period in which the new legislation is enacted. However, the SEC staff issued SAB 118, which will allow us to record provisional amounts during a measurement period, which should not extend beyond one year from the enactment date. In accordance with SAB 118, income tax effects of the TCJA may be refined as additional analysis is completed based on obtaining, preparing, or analyzing additional information about facts and circumstances that existed as of the enactment date that was not initially reported as provisional amounts. In addition, the provisional amounts may also be affected upon additional TCJA guidance being issued during the measurement period. As of December 31, 2017, we have not completed our accounting for the effects of enactment of the TCJA; however, in certain cases, as described below, we have recorded a provisional tax benefit of $62.3 million related to the remeasurement of our existing deferred tax balances from 35% to 21% and a provisional tax expense of $429.2 million related to the one-time transition tax. The prospective release of additional guidance may require us to refine our calculations and adjust our estimate. Each of the provisional estimates have been included as a component of income tax from continuing operations. As of December 31, 2017, we have not completed the accounting for the tax effects of the GILTI tax law provision and an accounting policy has not yet been elected. The effect of the GILTI international provision is uncertain. Quantifying the impacts of GILTI is not estimable at this time due, among other things, to the inherent complexities involved. Income from continuing operations before income taxes and equity in net income of unconsolidated investments, and current and deferred income tax expense (benefit) are composed of the following (in thousands): Year Ended December 31, 2017 2016 2015 Income from continuing operations before income taxes and equity in net income of unconsolidated investments: Domestic $ (8,293 ) $ 49,630 $ (15,861 ) Foreign 455,091 465,634 326,605 Total $ 446,798 $ 515,264 $ 310,744 Current income tax expense (benefit): Federal $ 394,747 $ 7,717 $ 76,778 State 323 1,407 (983 ) Foreign 78,688 63,957 58,710 Total $ 473,758 $ 73,081 $ 134,505 Deferred income tax (benefit) expense: Federal $ (58,640 ) $ 12,230 $ (127,212 ) State (2,288 ) (1,715 ) (1,267 ) Foreign 18,987 12,667 5,108 Total $ (41,941 ) $ 23,182 $ (123,371 ) Total income tax expense $ 431,817 $ 96,263 $ 11,134 The increase in the Federal current expense of $387.0 million is primarily related to the tax impact of the one-time transition tax imposed by the TCJA of $429.2 million . The increase in Federal deferred benefit of $70.8 million is primarily related to the tax impact associated with the remeasurement of deferred tax assets and liabilities under the recently enacted tax legislation from a statutory rate of 35% to 21% . This resulted in a deferred tax benefit of $62.3 million . The reconciliation of the U.S. federal statutory rate to the effective income tax rate is as follows: % of Income Before Income Taxes 2017 2016 2015 Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal tax benefit (0.5 ) (0.1 ) 1.4 Change in valuation allowance (1.4 ) 3.7 5.7 Impact of foreign earnings, net (a) (13.5 ) (19.3 ) (22.0 ) Change in U.S. federal statutory rate (b) (14.0 ) — — Transition tax on deferred foreign earnings (b) 96.1 — — Subpart F income 2.0 0.2 7.8 Deemed repatriation of foreign income (c) — — 105.5 Undistributed earnings of foreign subsidiaries (a)(c) (2.2 ) 0.1 (114.8 ) Stock-based compensation (1.9 ) — — Nondeductible transaction costs — — 2.0 Depletion (1.4 ) (1.0 ) (1.8 ) Revaluation of unrecognized tax benefits/reserve requirements (d) (0.7 ) (0.4 ) (14.4 ) Domestic manufacturing tax deduction — (0.9 ) (0.5 ) Other items, net (0.9 ) 1.4 (0.3 ) Effective income tax rate 96.6 % 18.7 % 3.6 % (a) During 2017 , 2016 and 2015 , we received actual and deemed distributions of $42.5 million , $308.4 million and $1.4 billion , respectively, from various foreign subsidiaries and joint ventures, and realized income tax expense, net of foreign tax credits, of $9.1 million , $67.5 million and $350.2 million , respectively, related to the repatriation of these earnings, which impacted our effective tax rate. Our statutory rate is decreased by of our share of the income of JBC, a Free Zones company under the laws of the Hashemite Kingdom of Jordan. The applicable provisions of the Jordanian law, and applicable regulations thereunder, do not have a termination provision and the exemption is indefinite. As a Free Zones company, JBC is not subject to income taxes on the profits of products exported from Jordan, and currently, substantially all of the profits are from exports. This resulted in a rate benefit of 8.9% , 7.3% , and 8.2% for 2017 , 2016 , and 2015 , respectively. (b) We have made a reasonable estimate of the tax impact of the U.S. enacted tax law on our business and our consolidated financial statements and have recorded a provisional tax benefit of $62.3 million related to the remeasurement of our deferred tax assets and liabilities for the reduction in the Federal statutory tax rate from 35% to 21% . We have also recognized a provisional tax expense of $429.2 million for the one-time transition tax. (c) In prior years, we designated the undistributed earnings of substantially all of our foreign subsidiaries as indefinitely reinvested. In 2015, we were not indefinitely reinvested in a portion of earnings from legacy Rockwood entities that were part of the repatriation planning, for which a deferred tax liability of $387.0 million was established in the opening balance sheet. This liability reversed upon the completion of the repatriation with $356.2 million impacting earnings and $30.8 million from foreign exchange differences. The reversal of this liability offsets the tax amount of $327.9 million from legacy Rockwood entities included in the deemed repatriation of foreign income. (d) In 2015, the main impact is from the release of reserves on the close of a U.S. federal audit, and lapse of statute of limitations. These releases provided a net benefit of approximately $42.7 million . Deferred income tax assets and liabilities recorded on the consolidated balance sheets as of December 31, 2017 and 2016 consist of the following (in thousands): December 31, 2017 2016 Deferred tax assets: Accrued employee benefits $ 21,463 $ 32,622 Accrued expenses — 10,065 Operating loss carryovers (a) 459,644 91,934 Pensions 64,799 96,635 Tax credit carryovers 11,634 1,029 Other 44,714 34,866 Gross deferred tax assets 602,254 267,151 Valuation allowance (a) (458,288 ) (69,900 ) Deferred tax assets 143,966 197,251 Deferred tax liabilities: Depreciation (334,162 ) (379,161 ) Intangibles (113,792 ) (99,969 ) Hedge of Net Investment of Foreign Subsidiary (17,028 ) (51,192 ) Other (24,265 ) (18,536 ) Deferred tax liabilities (489,247 ) (548,858 ) Net deferred tax liabilities $ (345,281 ) $ (351,607 ) Classification in the consolidated balance sheets: Noncurrent deferred tax assets $ 25,108 $ 61,132 Noncurrent deferred tax liabilities (370,389 ) (412,739 ) Net deferred tax liabilities $ (345,281 ) $ (351,607 ) (a) During 2017, the Company recorded a change in estimate related to a foreign entity that resulted in an increase to the deferred tax asset for net operating losses and an associated and equal valuation allowance of approximately $400.6 million . Changes in the balance of our deferred tax asset valuation allowance are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Balance at January 1 $ (69,900 ) $ (84,137 ) $ (30,768 ) Additions (408,252 ) (20,568 ) (59,889 ) Deductions 19,864 34,805 6,520 Balance at December 31 $ (458,288 ) $ (69,900 ) $ (84,137 ) At December 31, 2017 , we had approximately $11.6 million of domestic credits available to offset future payments of income taxes, expiring in varying amounts between 2018 and 2027 . We have established valuation allowances for $0.3 million of those domestic credits since we believe that it is more likely than not that the related deferred tax assets will not be realized. We believe that sufficient taxable income will be generated during the carryover period in order to utilize the other remaining credit carryovers. At December 31, 2017 , we have on a pre-tax basis, domestic state net operating losses of $156.1 million , expiring between 2018 and 2037, which have pre-tax valuation allowances of $39.3 million established. In addition, we have on a pre-tax basis $1.75 billion of foreign net operating losses of which a majority have an indefinite life, which have pre-tax valuation allowances for $1.73 billion established. We have established valuation allowances for these deferred tax assets since we believe that it is more likely than not that the related deferred tax assets will not be realized. For the same reason, we established pre-tax valuation allowances of $8.7 million and $34.4 million for other state and foreign deferred tax assets, respectively, unrelated to net operating losses. The realization of the deferred tax assets is dependent on the generation of sufficient taxable income in the appropriate tax jurisdictions. Although realization is not assured, we believe it is more likely than not that the remaining deferred tax assets will be realized. However, the amount considered realizable could be reduced if estimates of future taxable income change. We believe that it is more likely than not that the Company will generate sufficient taxable income in the future to fully utilize all other deferred tax assets. At December 31, 2017, as part of the TCJA, we recorded a provisional amount for our one-time transition tax liability of $429.2 million based on approximately $4.8 billion of cumulative undistributed earnings and profits of our non-U.S. subsidiaries and joint ventures, which in prior year, had been indefinitely reinvested or subject to a tax-free liquidation and do not give rise to significant incremental taxes. At December 31, 2017, no additional U.S. federal income taxes, U.S. state and local taxes, or foreign withholding or income taxes have been provided with respect to accumulated earnings of foreign subsidiaries, as the Company continues to evaluate is indefinite reinvestment assertion as a result of the TCJA. The accounting is expected to be completed within the one-year measurement period as allowed by SAB 118. During that period, if it is determined that cash can be repatriated with little to no tax consequences, we may choose to repatriate cash at that time. If in the foreseeable future, we can no longer demonstrate that these earnings are indefinitely reinvested, a deferred tax liability will be recognized. A determination of the amount of the unrecognized deferred tax liability related to these undistributed earnings is not practicable. During the year ended December 31, 2017, we recorded an income tax benefit of $9.7 million related to previously taxed foreign earnings that we expect to repatriate within the foreseeable future. No additional amounts of income tax expense or benefit related to the previously taxed foreign earnings have been recorded as of December 31, 2017, as the Company continues to evaluate its indefinite reinvestment assertion as a result of the TCJA. Liabilities related to uncertain tax positions were $24.4 million and $27.9 million at December 31, 2017 and 2016 , respectively, inclusive of interest and penalties of $2.9 million and $3.0 million at December 31, 2017 and 2016 , respectively, and are reported in Other noncurrent liabilities as provided in Note 16, “Other Noncurrent Liabilities.” These liabilities at December 31, 2017 and 2016 were reduced by $14.6 million and $15.1 million , respectively, for offsetting benefits from the corresponding effects of potential transfer pricing adjustments, state income taxes and rate arbitrage related to foreign structure. These offsetting benefits are recorded in Other assets as provided in Note 11, “Other Assets.” The resulting net liabilities of $6.9 million and $9.8 million at December 31, 2017 and 2016 , respectively, if recognized and released, would favorably affect earnings. The liabilities related to uncertain tax positions, exclusive of interest, were $21.4 million and $25.4 million at December 31, 2017 and 2016 , respectively. The following is a reconciliation of our total gross liability related to uncertain tax positions for 2017 , 2016 and 2015 (in thousands): Year Ended December 31, 2017 2016 2015 Balance at January 1 $ 25,384 $ 95,715 $ 24,969 Acquisition of Rockwood — — 124,758 Divestitures (a) — (55,881 ) — Additions for tax positions related to prior years — 548 4,329 Reductions for tax positions related to prior years (1,933 ) (1,253 ) (46,211 ) Additions for tax positions related to current year 1,132 1,271 202 Lapses in statutes of limitations/settlements (4,198 ) (12,591 ) (6,736 ) Foreign currency translation adjustment 1,053 (2,425 ) (5,596 ) Balance at December 31 $ 21,438 $ 25,384 $ 95,715 (a) Reclassified to Other noncurrent liabilities as a result of the indemnification of certain income tax liabilities associated with the Chemetall Surface Treatment entities sold. See Note 16, “Other Noncurrent Liabilities.” We are subject to income taxes in the U.S. and numerous foreign jurisdictions. Due to the statute of limitations, we are no longer subject to U.S. federal income tax audits by the Internal Revenue Service (“IRS”) for years prior to 2011. Due to the statute of limitations, we also are no longer subject to U.S. state income tax audits prior to 2011. With respect to jurisdictions outside the U.S., several audits are in process. We have audits ongoing for the years 2006 through 2015 related to Germany, Taiwan, Canada, Italy, India, and France, some of which are for entities that have since been divested. While we believe we have adequately provided for all tax positions, amounts asserted by taxing authorities could be greater than our accrued position. Accordingly, additional provisions on federal and foreign tax-related matters could be recorded in the future as revised estimates are made or the underlying matters are settled or otherwise resolved. Since the timing of resolutions and/or closure of tax audits is uncertain, it is difficult to predict with certainty the range of reasonably possible significant increases or decreases in the liability related to uncertain tax positions that may occur within the next twelve months. Our current view is that it is reasonably possible that we could record a decrease in the liability related to uncertain tax positions, relating to a number of issues, up to approximately $1.6 million as a result of closure of tax statutes.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments: In assessing the fair value of financial instruments, we use methods and assumptions that are based on market conditions and other risk factors existing at the time of assessment. Fair value information for our financial instruments is as follows: Long-Term Debt—the fair values of our senior notes are estimated using Level 1 inputs and account for the majority of the difference between the recorded amount and fair value of our long-term debt. The carrying value of our remaining long-term debt reported in the accompanying consolidated balance sheets approximates fair value as substantially all of such debt bears interest based on prevailing variable market rates currently available in the countries in which we have borrowings. December 31, 2017 2016 Recorded Amount Fair Value Recorded Amount Fair Value (In thousands) Long-term debt $ 1,845,309 $ 1,949,638 $ 2,381,370 $ 2,472,813 Foreign Currency Forward Contracts—we enter into foreign currency forward contracts in connection with our risk management strategies in an attempt to minimize the financial impact of changes in foreign currency exchange rates. These derivative financial instruments are used to manage risk and are not used for trading or other speculative purposes. The fair values of our foreign currency forward contracts are estimated based on current settlement values. At December 31, 2017 and 2016 , we had outstanding foreign currency forward contracts with notional values totaling $357.4 million and $251.6 million , respectively. Our foreign currency forward contracts outstanding at December 31, 2017 and 2016 have not been designated as hedging instruments under ASC 815, Derivatives and Hedging . As of December 31, 2017 and December 31, 2016 , $5.0 million and $0.2 million , respectively, was included in Accrued expenses associated with the fair value of our foreign currency forward contracts. Gains and losses on foreign currency forward contracts are recognized currently in Other (expenses) income, net; further, fluctuations in the value of these contracts are generally expected to be offset by changes in the value of the underlying exposures being hedged. For the years ended December 31, 2017 , 2016 and 2015 we recognized gains (losses) of $4.6 million , $16.1 million and ($38.5) million , respectively, in Other (expenses) income, net, in our consolidated statements of income related to the change in the fair value of our foreign currency forward contracts. These amounts are generally expected to be offset by changes in the value of the underlying exposures being hedged which are also reported in Other (expenses) income, net. Also, for the years ended December 31, 2017 , 2016 and 2015 , we recorded (gains) losses of ($4.6) million , ($16.1) million and $38.5 million , respectively, related to the change in the fair value of our foreign currency forward contracts, and net cash receipts (settlements) of $9.4 million , $16.0 million and ($37.6) million , respectively, in Other, net, in our consolidated statements of cash flows. The counterparties to our foreign currency forward contracts are major financial institutions with which we generally have other financial relationships. We are exposed to credit loss in the event of nonperformance by these counterparties. However, we do not anticipate nonperformance by the counterparties.

Fair Value Measurement

Fair Value Measurement	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement: Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The inputs used to measure fair value are classified into the following hierarchy: Level 1 Unadjusted quoted prices in active markets for identical assets or liabilities Level 2 Unadjusted quoted prices in active markets for similar assets or liabilities, or unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or inputs other than quoted prices that are observable for the asset or liability Level 3 Unobservable inputs for the asset or liability We endeavor to utilize the best available information in measuring fair value. Financial assets and liabilities are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. Transfers between levels of the fair value hierarchy are deemed to have occurred on the date of the event or change in circumstance that caused the transfer. There were no transfers between Levels 1 and 2 during the year ended December 31, 2017 . The following tables set forth our financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Assets: Investments under executive deferred compensation plan (a) $ 25,494 $ 25,494 $ — $ — Private equity securities (b) $ 38 $ 38 $ — $ — Private equity securities measured at net asset value (b)(c) $ 5,121 $ — $ — $ — Pension assets (d) $ 563,460 $ 493,848 $ 69,612 $ — Pension assets measured at net asset value (d) $ 96,414 $ — $ — $ — Postretirement assets (d) $ 834 $ — $ 834 $ — Liabilities: Obligations under executive deferred compensation plan (a) $ 25,494 $ 25,494 $ — $ — Foreign currency forward contracts (e) $ 4,954 $ — $ 4,954 $ — December 31, 2016 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Assets: Investments under executive deferred compensation plan (a) $ 22,037 $ 22,037 $ — $ — Private equity securities (b) $ 35 $ 35 $ — $ — Private equity securities measured at net asset value (b)(c) $ 5,498 $ — $ — $ — Pension assets (d) $ 520,845 $ 460,247 $ 60,598 $ — Pension assets measured at net asset value (d) $ 86,112 $ — $ — $ — Postretirement assets (d) $ 2,232 $ — $ 2,232 $ — Liabilities: Obligations under executive deferred compensation plan (a) $ 22,037 $ 22,037 $ — $ — Foreign currency forward contracts (e) $ 182 $ — $ 182 $ — (a) We maintain an EDCP that was adopted in 2001 and subsequently amended. The purpose of the EDCP is to provide current tax planning opportunities as well as supplemental funds upon the retirement or death of certain of our employees. The EDCP is intended to aid in attracting and retaining employees of exceptional ability by providing them with these benefits. We also maintain a Benefit Protection Trust (the “Trust”) that was created to provide a source of funds to assist in meeting the obligations of the EDCP, subject to the claims of our creditors in the event of our insolvency. Assets of the Trust are consolidated in accordance with authoritative guidance. The assets of the Trust consist primarily of mutual fund investments (which are accounted for as trading securities and are marked-to-market on a monthly basis through the consolidated statements of income) and cash and cash equivalents. As such, these assets and obligations are classified within Level 1. (b) Primarily consists of private equity securities classified as available-for-sale and are reported in Investments in the consolidated balance sheets. The changes in fair value are reported in Other (expenses) income, net, in our consolidated statements of income. (c) Holdings in private equity securities are measured at fair value using the net asset value per share (or its equivalent) practical expedient and have not been categorized in the fair value hierarchy. The fair value amounts of $5.1 million and $5.5 million as of December 31, 2017 and 2016 , respectively, are included in this table to permit reconciliation to the marketable equity securities presented in Note 10, “Investments.” (d) See Note 15 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets. (e) As a result of our global operating and financing activities, we are exposed to market risks from changes in foreign currency exchange rates, which may adversely affect our operating results and financial position. When deemed appropriate, we minimize our risks from foreign currency exchange rate fluctuations through the use of foreign currency forward contracts. Unless otherwise noted, these derivative financial instruments are not designated as hedging instruments under ASC 815, Derivatives and Hedging . The foreign currency forward contracts are valued using broker quotations or market transactions in either the listed or over-the-counter markets. As such, these derivative instruments are classified within Level 2.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions: Our consolidated statements of income include sales to and purchases from unconsolidated affiliates in the ordinary course of business as follows (in thousands): Year Ended December 31, 2017 2016 2015 Sales to unconsolidated affiliates $ 29,514 $ 29,651 $ 24,180 Purchases from unconsolidated affiliates (a) $ 209,266 $ 130,287 $ 115,697 (a) Increase in 2017 primarily due to material purchases from our Windfield joint venture. Our consolidated balance sheets include accounts receivable due from and payable to unconsolidated affiliates in the ordinary course of business as follows (in thousands): December 31, 2017 2016 Receivable from related parties $ 2,406 $ 2,159 Payable to related parties $ 55,801 $ 38,466

Segment and Geographic Area Inf

Segment and Geographic Area Information	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Segment and Geographic Area Information	Segment and Geographic Area Information: As of December 31, 2017 our three reportable segments include Lithium and Advanced Materials, Bromine Specialties and Refining Solutions. On June 17, 2016, the Company signed a definitive agreement to sell its Chemetall Surface Treatment business, a separate reportable segment, to BASF SE. This business was classified as discontinued operations and its results are excluded from segment results for all periods presented. Each segment has a dedicated team of sales, research and development, process engineering, manufacturing and sourcing, and business strategy personnel and has full accountability for improving execution through greater asset and market focus, agility and responsiveness. This business structure aligns with the markets and customers we serve through each of the segments. This structure also facilitates the continued standardization of business processes across the organization, and is consistent with the manner in which information is presently used internally by the Company’s chief operating decision maker to evaluate performance and make resource allocation decisions. Summarized financial information concerning our reportable segments is shown in the following tables. The “All Other” category comprises operating segments that do not fit into any of our core businesses subsequent to the acquisition of Rockwood: minerals-based flame retardants and specialty chemicals, fine chemistry services and metal sulfides. During the first quarter of 2016, we completed the sales of the metal sulfides business and the minerals-based flame retardants and specialty chemicals business. For additional information about these businesses, see Note 3, “Divestitures.” The Corporate category is not considered to be a segment and includes corporate-related items not allocated to the reportable segments. Pension and OPEB service cost (which represents the benefits earned by active employees during the period) and amortization of prior service cost or benefit are allocated to the reportable segments, All Other, and Corporate, whereas the remaining components of pension and OPEB benefits cost or credit (“Non-operating pension and OPEB items”) are included in Corporate. Segment data includes intersegment transfers of raw materials at cost and allocations for certain corporate costs. The Company’s chief operating decision maker uses earnings before interest, taxes, depreciation and amortization, as adjusted on a consistent basis for certain non-recurring or unusual items such as acquisition and integration related costs, utilization of inventory markup, gains or losses on sales of businesses, restructuring charges, facility divestiture charges, non-operating pension and OPEB items and other significant non-recurring items (“adjusted EBITDA”), in a balanced manner and on a segment basis to assess the ongoing performance of the Company’s business segments and to allocate resources. In addition, management uses adjusted EBITDA for business planning purposes and as a significant component in the calculation of performance-based compensation for management and other employees. The Company has reported adjusted EBITDA because management believes it provides transparency to investors and enables period-to-period comparability of financial performance. Adjusted EBITDA is a financial measure that is not required by, or presented in accordance with, U.S. GAAP. Adjusted EBITDA should not be considered as an alternative to Net income attributable to Albemarle Corporation, the most directly comparable financial measure calculated and reported in accordance with U.S. GAAP, or any other financial measure reported in accordance with U.S. GAAP. Year Ended December 31, 2017 2016 2015 (In thousands) Net sales: Lithium and Advanced Materials $ 1,308,153 $ 968,216 $ 834,590 Bromine Specialties 855,143 792,425 775,729 Refining Solutions 778,304 732,137 729,261 All Other 128,914 180,988 471,434 Corporate 1,462 3,437 15,415 Total net sales $ 3,071,976 $ 2,677,203 $ 2,826,429 Adjusted EBITDA: Lithium and Advanced Materials $ 518,530 $ 363,360 $ 312,867 Bromine Specialties 258,901 226,926 222,653 Refining Solutions 212,005 238,963 197,595 All Other 13,878 14,772 53,993 Corporate (117,834 ) (85,804 ) (31,108 ) Total adjusted EBITDA $ 885,480 $ 758,217 $ 756,000 See below for a reconciliation of adjusted EBITDA, the non-GAAP financial measure, to Net income attributable to Albemarle Corporation, the most directly comparable financial measure calculated and reported in accordance with U.S. GAAP (in thousands): Lithium and Advanced Materials Bromine Specialties Refining Solutions Reportable Segments Total All Other Corporate Consolidated Total 2017 Net income (loss) attributable to Albemarle Corporation $ 400,360 $ 218,839 $ 173,297 $ 792,496 $ 5,521 $ (743,167 ) $ 54,850 Depreciation and amortization 102,389 40,062 39,958 182,409 8,357 6,162 196,928 Utilization of inventory markup (a) 23,095 — — 23,095 — — 23,095 Restructuring and other, net (b) — — — — — 17,056 17,056 Gain on acquisition (c) (6,221 ) — — (6,221 ) — — (6,221 ) Acquisition and integration related costs (d) — — — — — 33,954 33,954 Interest and financing expenses (e) — — — — — 115,350 115,350 Income tax expense — — — — — 431,817 431,817 Non-operating pension and OPEB items — — — — — (16,125 ) (16,125 ) Multiemployer plan shortfall contributions (f) — — — — — 7,887 7,887 Note receivable reserve (g) — — — — — 28,730 28,730 Other (h) (1,093 ) — (1,250 ) (2,343 ) — 502 (1,841 ) Adjusted EBITDA $ 518,530 $ 258,901 $ 212,005 $ 989,436 $ 13,878 $ (117,834 ) $ 885,480 2016 Net income (loss) attributable to Albemarle Corporation $ 261,394 $ 187,364 $ 202,874 $ 651,632 $ 131,301 $ (139,258 ) $ 643,675 Depreciation and amortization 101,966 39,562 36,089 177,617 7,302 6,056 190,975 (Gain) loss on sales of businesses, net (i) — — — — (123,831 ) 1,533 (122,298 ) Acquisition and integration related costs (d) — — — — — 57,384 57,384 Interest and financing expenses — — — — — 65,181 65,181 Income tax expense — — — — — 96,263 96,263 Income from discontinued operations (net of tax) — — — — — (202,131 ) (202,131 ) Non-operating pension and OPEB items — — — — — 25,589 25,589 Other (j) — — — — — 3,579 3,579 Adjusted EBITDA $ 363,360 $ 226,926 $ 238,963 $ 829,249 $ 14,772 $ (85,804 ) $ 758,217 2015 Net income (loss) attributable to Albemarle Corporation $ 148,821 $ 186,474 $ 161,585 $ 496,880 $ 32,781 $ (194,755 ) $ 334,906 Depreciation and amortization 84,069 36,179 34,039 154,287 18,183 8,703 181,173 Utilization of inventory markup (k) 79,977 — — 79,977 3,029 — 83,006 Restructuring and other, net (l) — — — — — (6,804 ) (6,804 ) Acquisition and integration related costs (d) — — — — — 132,299 132,299 Interest and financing expenses — — — — — 81,650 81,650 Income tax expense — — — — — 11,134 11,134 Income from discontinued operations (net of tax) — — — — — (32,476 ) (32,476 ) Non-operating pension and OPEB items — — — — — (35,300 ) (35,300 ) Other (m) — — 1,971 1,971 — 4,441 6,412 Adjusted EBITDA $ 312,867 $ 222,653 $ 197,595 $ 733,115 $ 53,993 $ (31,108 ) $ 756,000 (a) In connection with the acquisition of Jiangli New Materials, the Company valued inventory purchased from Jiangli New Materials at fair value, which resulted in a markup of the underlying net book value of the inventory totaling approximately $23.1 million . The utilization of this inventory markup was included in Costs of goods sold during the year ended December 31, 2017, the estimated remaining selling period. (b) During 2017, we initiated action to reduce costs in each of our reportable segments at several locations, primarily at our Lithium sites in Germany. Based on the restructuring plans, we have recorded expenses of $2.9 million in Cost of goods sold, $8.4 million in Selling, general and administrative expenses, and $5.7 million in Research and development expenses for the year ended December 31, 2017, primarily related to expected severance payments. The unpaid balance is recorded in Accrued expenses at December 31, 2017, with the expectation that the majority of these plans will be completed by the end of 2018. (c) Gain recorded in Other (expenses) income, net related to the acquisition of the remaining 50% interest in Salmag. See Note 2, “Acquisitions,” for additional information. (d) See Note 2, “Acquisitions,” for additional information. (e) Included in Interest and financing expenses is a loss on early extinguishment of debt of $52.8 million . See Note 14, “Long-Term Debt,” for additional information. (f) Shortfall contributions for our multiemployer plan financial improvement plan. See Note 15, “Pension Plans and Other Postretirement Benefits,” for additional information. (g) Reserve recorded in Other (expenses) income, net against a note receivable on one of our European entities no longer deemed probable of collection. (h) Included amounts for the year ended December 31, 2017 recorded in: ▪ Cost of goods sold - $1.3 million reversal of deferred income related to an abandoned project at an unconsolidated investment. ▪ Selling, general and administrative expenses - $1.0 million related to a reversal of an accrual recorded as part of purchase accounting from a previous acquisition. ▪ Other (expenses) income, net - $3.2 million of asset retirement obligation charges related to the revision of an estimate at a site formerly owned by Albemarle, losses of $4.1 million related to final settlements of previously disposed businesses, the revision of tax indemnification expenses of $3.7 million primarily related to the filing of tax returns and a competent authority agreement for a previously disposed business and $1.0 million related to the settlement of a legal claim. This is partially offset by gains of $10.6 million and $1.1 million related to the reversal of liabilities recorded as part of purchase accounting from a previous acquisition and the previous disposal of a property, respectively. (i) See Note 3, “Divestitures,” for additional information. (j) Included amounts for the year ended December 31, 2016 recorded in: ▪ Research and development expenses - $1.4 million related to the write-off of fixed assets in China. ▪ Selling, general and administrative expenses - $0.9 million related to the net loss on the sales of properties. ▪ Other (expenses) income, net - $2.4 million related to environmental charges related to a site formerly owned by Albemarle, partially offset by a gain related to a previously disposed of site in China of $1.1 million . (k) In connection with the acquisition of Rockwood, the Company valued Rockwood’s existing inventory at fair value as of the Acquisition Closing Date, which resulted in a markup of the underlying net book value of the inventory totaling approximately $103.4 million . The inventory markup was expensed over the estimated remaining selling period. For the year ended December 31, 2015, $55.9 million was included in Cost of goods sold, and Equity in net income of unconsolidated investments was reduced by $27.1 million related to the utilization of the inventory markup. (l) Included in Restructuring and other, net, for the year ended December 31, 2015 is a gain of $6.8 million recognized upon the sale of land in Avonmouth, U.K., which was utilized by the phosphorus flame retardants business we exited in 2012. In 2012, charges in connection with our exit of the phosphorus flame retardants business were recorded in Restructuring and other, net, on our consolidated statements of income. (m) Refining Solutions included an impairment charge of approximately $2.0 million related to our unconsolidated investment in Fábrica Carioca de Catalisadores SA. Corporate included approximately $4.4 million of financing-related fees expensed in connection with the acquisition of Rockwood. As of December 31, 2017 2016 2015 (In thousands) Identifiable assets: Lithium and Advanced Materials $ 4,057,242 $ 3,809,883 $ 3,658,669 Bromine Specialties 745,007 724,218 699,929 Refining Solutions 1,016,519 913,923 937,445 Discontinued Operations — — 3,208,902 All Other 126,486 130,595 517,695 Corporate (a) 1,805,518 2,582,588 575,314 Total identifiable assets $ 7,750,772 $ 8,161,207 $ 9,597,954 Goodwill: Lithium and Advanced Materials $ 1,396,140 $ 1,348,261 $ 1,267,505 Bromine Specialties 20,319 20,319 20,319 Refining Solutions 187,310 164,866 172,728 All Other 6,586 6,586 — Total goodwill $ 1,610,355 $ 1,540,032 $ 1,460,552 (a) As of December 31, 2016, Corporate included the net proceeds received from the sale of the Chemetall Surface Treatment business completed on December 14, 2016, less the repayment of the term loans and commercial paper using those proceeds. See Note 3, “Divestitures,” and Note 14, “Long-Term Debt” for additional details about these transactions. Year Ended December 31, 2017 2016 2015 (In thousands) Depreciation and amortization: Lithium and Advanced Materials $ 102,389 $ 101,966 $ 84,069 Bromine Specialties 40,062 39,562 36,179 Refining Solutions 39,958 36,089 34,039 Discontinued Operations — 35,194 78,903 All Other 8,357 7,302 18,183 Corporate 6,162 6,056 8,703 Total depreciation and amortization $ 196,928 $ 226,169 $ 260,076 Capital expenditures: Lithium and Advanced Materials $ 207,410 $ 91,967 $ 104,344 Bromine Specialties 46,427 46,414 54,994 Refining Solutions 31,716 27,546 28,836 Discontinued Operations — 19,281 23,738 All Other 3,657 9,251 13,054 Corporate 28,493 2,195 2,683 Total capital expenditures $ 317,703 $ 196,654 $ 227,649 Year Ended December 31, 2017 2016 2015 (In thousands) Net Sales: United States $ 840,589 $ 797,267 $ 911,519 Foreign (a) 2,231,387 1,879,936 1,914,910 Total $ 3,071,976 $ 2,677,203 $ 2,826,429 (a) In 2017 and 2016, net sales to China represented 15% and 13% , respectively, of total net sales. No net sales in any other foreign country exceed 10% of total net sales. Also, net sales are attributed to countries based upon shipments to final destination. As of December 31, 2017 2016 2015 (In thousands) Long-Lived Assets (a) : United States $ 833,002 $ 850,689 $ 800,214 Chile 1,069,859 922,878 916,965 Netherlands 171,980 145,917 155,128 Jordan 242,626 227,222 230,460 Australia 364,624 288,553 280,222 Brazil 47,255 46,380 39,299 Germany 115,305 117,027 137,890 China 50,532 31,564 4,773 France 40,852 39,470 39,344 Korea (b) 495 65,963 72,685 Other foreign countries 60,131 57,936 58,899 Total $ 2,996,661 $ 2,793,599 $ 2,735,879 (a) Long-lived assets are comprised of the Company’s Property, plant and equipment and Investments. (b) The reduction as of December 31, 2017, relates to the assets of the polyolefin catalysts and components portion of the PCS business that are included in Assets held for sale in the consolidated balance sheet. Net sales to external customers by product category in each of the segments consists of the following: Year Ended December 31, 2017 2016 2015 (In thousands) Lithium and Advanced Materials: Lithium $ 1,018,885 $ 668,852 $ 508,844 Performance Catalyst Solutions 289,268 299,364 325,746 Total Lithium and Advanced Materials $ 1,308,153 $ 968,216 $ 834,590 Bromine Specialties $ 855,143 $ 792,425 $ 775,729 Refining Solutions $ 778,304 $ 732,137 $ 729,261 In November 2017, we announced that during the first quarter of 2018, the PCS product category will merge with the Refining Solutions reportable segment to form a global business focused on catalysts. As a result, our three reportable segments will include: (1) Lithium, (2) Bromine Specialties and (3) Catalysts.

Quarterly Financial Summary (Un

Quarterly Financial Summary (Unaudited)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Summary (Unaudited)	Quarterly Financial Summary (Unaudited): First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share amounts) 2017 Net sales $ 722,063 $ 737,258 $ 754,866 $ 857,789 Gross profit $ 255,088 $ 272,094 $ 275,789 $ 307,009 Net income (loss) from continuing operations $ 62,657 $ 113,689 $ 130,193 $ (207,071 ) Net income attributable to noncontrolling interests (11,444 ) (10,356 ) (11,523 ) (11,295 ) Net income (loss) attributable to Albemarle Corporation $ 51,213 $ 103,333 $ 118,670 $ (218,366 ) Basic earnings (loss) per share $ 0.46 $ 0.93 $ 1.07 $ (1.98 ) Shares used to compute basic earnings per share 111,986 110,686 110,476 110,510 Diluted earnings (loss) per share $ 0.45 $ 0.92 $ 1.06 $ (1.95 ) Shares used to compute diluted earnings per share 113,289 112,105 111,975 112,152 First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share amounts) 2016 Net sales $ 657,211 $ 669,327 $ 654,010 $ 696,655 Gross profit $ 242,534 $ 248,104 $ 238,972 $ 240,966 Gain on sales of businesses, net (a) $ (121,324 ) $ (974 ) $ — $ — Acquisition and integration related costs (b) $ 18,558 $ 19,030 $ 6,749 $ 13,047 Net income from continuing operations $ 218,236 $ 95,586 $ 114,512 $ 50,304 Income (loss) from discontinued operations (net of tax) (c) 17,312 (398,340 ) 23,185 559,974 Net income attributable to noncontrolling interests (7,362 ) (12,067 ) (9,477 ) (8,188 ) Net income (loss) attributable to Albemarle Corporation $ 228,186 $ (314,821 ) $ 128,220 $ 602,090 Basic earnings (loss) per share: Continuing operations $ 1.88 $ 0.74 $ 0.93 $ 0.37 Discontinued operations 0.15 (3.54 ) 0.21 4.98 $ 2.03 $ (2.80 ) $ 1.14 $ 5.35 Shares used to compute basic earnings per share 112,260 112,339 112,429 112,487 Diluted earnings (loss) per share: Continuing operations $ 1.87 $ 0.74 $ 0.93 $ 0.37 Discontinued operations 0.15 (3.52 ) 0.20 4.93 $ 2.02 $ (2.78 ) $ 1.13 $ 5.30 Shares used to compute diluted earnings per share 112,770 113,175 113,448 113,563 (a) Included in Gain on sales of businesses, net for the year ended December 31, 2016 is $11.5 million and $112.3 million related to the sales of the metal sulfides business and the minerals-based flame retardants and specialty chemicals business, respectively, both of which closed in the first quarter of 2016. In addition, Gain on sales of businesses, net for the year ended December 31, 2016 includes a loss of $1.5 million on the sale of our wafer reclaim business. See Note 3, “Divestitures,” for additional information. (b) See Note 2, “Acquisitions,” for additional information. (c) Included in Income (loss) from discontinued operations (net of tax) for the second quarter of 2016 is a nonrecurring, non-cash tax charge of $416.7 million related to the change in the Company’s assertion over book and tax basis differences for certain entities included in the sale of the Chemetall Surface Treatment business. In the fourth quarter of 2016, this non-cash tax charge was reversed as a result of the completion of the sale. In addition, the fourth quarter of 2016 includes an after-tax gain of $135.0 million as a result of the sale of the Chemetall Surface Treatment business. As discussed in Note 1, “Summary of Significant Accounting Policies,” actuarial gains and losses related to our defined benefit pension and OPEB plan obligations are recognized annually in our consolidated statements of income in the fourth quarter and whenever a plan is determined to qualify for a remeasurement during a fiscal year. During the year ended December 31, 2017, actuarial gains were recognized as follows: fourth quarter— $11.4 million ( $7.3 million after income taxes) as a result of the annual remeasurement process. During the year ended December 31, 2016, actuarial losses were recognized as follows: fourth quarter— $26.7 million ( $18.3 million after income taxes) as a result of the annual remeasurement process.

Summary of Significant Accoun33

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2017
Accounting Policies [Abstract]
Basis of Consolidation	Basis of Consolidation The consolidated financial statements include the accounts and operations of Albemarle Corporation and our wholly owned, majority owned and controlled subsidiaries. Unless the context otherwise indicates, the terms “Albemarle,” “we,” “us,” “our” or “the Company” mean Albemarle Corporation and its consolidated subsidiaries. For entities that we control and are the primary beneficiary, but own less than 100%, we record the minority ownership as noncontrolling interest. We apply the equity method of accounting for investments in which we have an ownership interest from 20% to 50% or where we exercise significant influence over the related investee’s operations. All significant intercompany accounts and transactions are eliminated in consolidation. As described further in Note 2, “Acquisitions,” we completed our acquisition of Rockwood Holdings, Inc. (“Rockwood”) on January 12, 2015. The consolidated financial statements contained herein include the results of operations of Rockwood, commencing on January 13, 2015.
Discontinued Operations	Discontinued Operations Effective January 1, 2015, a component or group of components that is classified as held for sale or that has been disposed of by sale, and which represents a strategic shift that has or will have a major effect on our operations and financial results, is reported as discontinued operations beginning in the period when these criteria are met. Our assets and liabilities held for sale at December 31, 2017 related to the polyolefin catalysts and components business did not meet the criteria to be presented as discontinued operations. On December 14, 2016, the Company closed the sale of the Chemetall Surface Treatment business to BASF SE. In accordance with the applicable accounting guidance, the Company began accounting for this business as discontinued operations in the consolidated statements of income and excluded the business from segment results for all periods presented. See Note 3, “Divestitures,” for additional information.
Estimates, Assumptions and Reclassifications	Estimates, Assumptions and Reclassifications The preparation of financial statements in conformity with generally accepted accounting principles (“GAAP”) in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of revenues, expenses, assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. Certain amounts in the accompanying consolidated financial statements and notes thereto have been reclassified to conform to the current presentation. Income tax expense for the year ended December 31, 2017 includes expense of $5.1 million due to an adjustment in the Company’s deferred tax liabilities for basis differences in Chilean fixed assets related to the year ended December 31, 2016. The Company does not believe this adjustment is material to the consolidated financial statements for the years ended December 31, 2017 or 2016. In addition, for the year ended December 31, 2017, the Company began reporting its acquisition and integration related costs and restructuring and other costs in Cost of goods sold, Selling, general and administrative expenses and Research and development expenses. See Note 2, “Acquisitions,” and Note 24, “Segment and Geographic Area Information,” for further details.
Revenue Recognition	Revenue Recognition We recognize sales when the revenue is realized or realizable, and has been earned, in accordance with authoritative accounting guidance. We recognize net sales as risk and title to the product transfer to the customer, which usually occurs at the time shipment is made. Significant portions of our sales are sold free on board shipping point or on an equivalent basis, and other transactions are based upon specific contractual arrangements. Our standard terms of delivery are generally included in our contracts of sale, order confirmation documents and invoices. We recognize revenue from services when performance of the services has been completed. Where the Company incurs pre-production design and development costs under long-term supply contracts, these costs are expensed where they relate to the products sold unless contractual guarantees for reimbursement exist. Conversely, these costs are capitalized if they pertain to equipment that we will own and use in producing the products to be supplied and expect to utilize for future revenue generating activities.
Shipping and Handling Costs	Amounts billed to customers in a sales transaction related to shipping and handling have been classified as net sales and the cost incurred by us for shipping and handling has been classified as cost of goods sold in the accompanying consolidated statements of income. In addition, taxes billed to customers in a sales transaction are presented in the consolidated statements of income on a net basis.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include cash and money market investments with insignificant interest rate risks and no limitations on access.
Inventories	Inventories Inventories are stated at lower of cost and net realizable value with cost determined primarily on the first-in, first-out basis. Cost is determined on the weighted-average basis for a small portion of our inventories at foreign plants and our stores, supplies and other inventory. A portion of our domestic produced finished goods and raw materials are determined on the last-in, first-out basis.
Property, Plant and Equipment	Property, Plant and Equipment Property, plant and equipment include costs of assets constructed, purchased or leased under a capital lease, related delivery and installation costs and interest incurred on significant capital projects during their construction periods. Expenditures for renewals and betterments also are capitalized, but expenditures for normal repairs and maintenance are expensed as incurred. Costs associated with yearly planned major maintenance are generally deferred and amortized over 12 months or until the same major maintenance activities must be repeated, whichever is shorter. The cost and accumulated depreciation applicable to assets retired or sold are removed from the respective accounts, and gains or losses thereon are included in income. We assign the useful lives of our property, plant and equipment based upon our internal engineering estimates which are reviewed periodically. The estimated useful lives of our property, plant and equipment range from two to sixty years and depreciation is recorded on the straight-line method, with the exception of our long-term mineral rights, which are depleted on a units-of-production method. We evaluate the recovery of our property, plant and equipment by comparing the net carrying value of the asset group to the undiscounted net cash flows expected to be generated from the use and eventual disposition of that asset group when events or changes in circumstances indicate that its carrying amount may not be recoverable. If the carrying amount of the asset group is not recoverable, the fair value of the asset group is measured and if the carrying amount exceeds the fair value, an impairment loss is recognized.
Resource Development Expenses	Resource Development Expenses We incur costs in resource exploration, evaluation and development during the different phases of our resource development projects. Exploration costs incurred before obtaining legal rights to explore an area are generally expensed as incurred. After obtaining legal rights, exploration costs are expensed in areas where we have uncertainty about obtaining proven resources. In areas where we have substantial knowledge about the area and consider it probable to obtain commercially viable proven resources, exploration and evaluation costs can be capitalized. If technical feasibility studies have been obtained, resource evaluation expenses are capitalized when the study demonstrates proven or probable resources for which future economic returns are expected, while costs for projects that are not considered viable are expensed. Development costs that are necessary to bring the property to commercial production or increase the capacity or useful life are capitalized. Costs to maintain the production capacity in a property under production are expensed as incurred. Capitalized resource costs are depleted using the units-of-production method. Our resource development assets are evaluated for impairment when events or changes in circumstances indicate that the carrying amount may not be recoverable.
Investments	Investments Investments are accounted for using the equity method of accounting if the investment gives us the ability to exercise significant influence, but not control, over the investee. Significant influence is generally deemed to exist if we have an ownership interest in the voting stock of the investee between 20% and 50%, although other factors, such as representation on the investee’s board of directors and the impact of commercial arrangements, are considered in determining whether the equity method of accounting is appropriate. Under the equity method of accounting, we record our investments in equity-method investees in the consolidated balance sheets as Investments and our share of investees’ earnings or losses together with other-than-temporary impairments in value as Equity in net income of unconsolidated investments in the consolidated statements of income. We evaluate our equity method investments for impairment whenever events or changes in circumstances indicate that the carrying amounts of such investments may be impaired. If a decline in the value of an equity method investment is determined to be other than temporary, a loss is recorded in earnings in the current period. Our 50% -owned Saudi Organometallic Chemicals Company (“SOCC”) joint venture in Saudi Arabia, included in our Lithium and Advanced Materials segment, experienced a net loss, which affected our equity in income from unconsolidated investments by approximately $3.8 million for the year ended December 31, 2017, indicating the carrying value potentially may be impaired. As a result, we assessed the recoverability of the investment in this venture as of December 31, 2017. As of December 31, 2017, the carrying amount of our equity interest in SOCC was $4.5 million . Based on our assessment, we concluded not to record any impairment of the investment carrying value as of December 31, 2017. We estimated the fair value based on present value techniques involving future cash flows. Future cash flows include assumptions about sales volumes, selling prices, raw material prices, labor and other employee benefit costs, capital additions, income taxes, working capital, and other economic or market-related factors. Significant management judgment is involved in estimating these variables, and they include inherent uncertainties since they are forecasting future events. Certain mutual fund investments are accounted for as trading equities and are marked-to-market on a periodic basis through the consolidated statements of income. Investments in joint ventures and nonmarketable securities of immaterial entities are estimated based upon the overall performance of the entity where financial results are not available on a timely basis.
Environmental Compliance and Remediation	Environmental Compliance and Remediation Environmental compliance costs include the cost of purchasing and/or constructing assets to prevent, limit and/or control pollution or to monitor the environmental status at various locations. These costs are capitalized and depreciated based on estimated useful lives. Environmental compliance costs also include maintenance and operating costs with respect to pollution prevention and control facilities and other administrative costs. Such operating costs are expensed as incurred. Environmental remediation costs of facilities used in current operations are generally immaterial and are expensed as incurred. We accrue for environmental remediation costs and post-remediation costs that relate to existing conditions caused by past operations at facilities or off-plant disposal sites in the accounting period in which responsibility is established and when the related costs are estimable. In developing these cost estimates, we evaluate currently available facts regarding each site, with consideration given to existing technology, presently enacted laws and regulations, prior experience in remediation of contaminated sites, the financial capability of other potentially responsible parties and other factors, subject to uncertainties inherent in the estimation process. If the amount and timing of the cash payments for a site are fixed or reliably determinable, the liability is discounted, if the calculated discount is material. Additionally, these estimates are reviewed periodically, with adjustments to the accruals recorded as necessary.
Research and Development Expenses	Research and Development Expenses Our research and development expenses related to present and future products are expensed as incurred. These expenses consist primarily of personnel-related costs and other overheads, as well as outside service and consulting costs incurred for specific programs. Our U.S. facilities in Michigan, Pennsylvania, Texas and Louisiana and our global facilities in the Netherlands, Germany, Belgium and Korea form the capability base for our contract research and custom manufacturing businesses. These business areas provide research and scale-up services primarily to innovative life science companies.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets We account for goodwill and other intangibles acquired in a business combination in conformity with current accounting guidance that requires that goodwill and indefinite-lived intangible assets not be amortized. We test goodwill for impairment by comparing the estimated fair value of our reporting units to the related carrying value. Our reporting units are either our operating business segments or one level below our operating business segments for which discrete financial information is available and for which operating results are regularly reviewed by the business management and the chief operating decision maker. We estimate the fair value based on present value techniques involving future cash flows. Future cash flows include assumptions about sales volumes, selling prices, raw material prices, labor and other employee benefit costs, capital additions, income taxes, working capital, and other economic or market-related factors. Significant management judgment is involved in estimating these variables and they include inherent uncertainties since they are forecasting future events. We perform a sensitivity analysis by using a range of inputs to confirm the reasonableness of these estimates being used in the goodwill impairment analysis. We use a Weighted Average Cost of Capital (“WACC”) approach to determine our discount rate for goodwill recoverability testing. Our WACC calculation incorporates industry-weighted average returns on debt and equity from a market perspective. The factors in this calculation are largely external to the Company and, therefore, are beyond our control. We test our recorded goodwill for impairment in the fourth quarter of each year or upon the occurrence of events or changes in circumstances that would more likely than not reduce the fair value of our reporting units below their carrying amounts. The Company performed its annual goodwill impairment test as of October 31, 2017 and concluded there was no impairment as of that date. In addition, no indications of impairment in any of our reporting units were indicated by the sensitivity analysis. We assess our indefinite-lived intangible assets, which include trade names, for impairment annually and between annual tests if events or changes in circumstances indicate that it is more likely than not that the asset is impaired. The indefinite-lived intangible asset impairment standard allows us to first assess qualitative factors to determine if a quantitative impairment test is necessary. Further testing is only required if we determine, based on the qualitative assessment, that it is more likely than not that the indefinite-lived intangible asset’s fair value is less than its carrying amount. If we determine based on the qualitative assessment that it is more likely than not that the asset is impaired, an impairment test is performed by comparing the fair value of the indefinite-lived intangible asset to its carrying amount. Definite-lived intangible assets, such as purchased technology, patents and customer lists, are amortized over their estimated useful lives generally for periods ranging from five to twenty-five years . Except for customer lists and relationships associated with the majority of our Lithium business, which are amortized using the pattern of economic benefit method, definite-lived intangible assets are amortized using the straight-line method. We evaluate the recovery of our definite-lived intangible assets by comparing the net carrying value of the asset group to the undiscounted net cash flows expected to be generated from the use and eventual disposition of that asset group when events or changes in circumstances indicate that its carrying amount may not be recoverable. If the carrying amount of the asset group is not recoverable, the fair value of the asset group is measured and if the carrying amount exceeds the fair value, an impairment loss is recognized. See Note 12, “Goodwill and Other Intangibles.”
Pension Plans and Other Postretirement Benefits	Pension Plans and Other Postretirement Benefits Under authoritative accounting standards, assumptions are made regarding the valuation of benefit obligations and the performance of plan assets. As required, we recognize a balance sheet asset or liability for each of our pension and other postretirement benefit (“OPEB”) plans equal to the plan’s funded status as of the measurement date. The primary assumptions are as follows: • Discount Rate—The discount rate is used in calculating the present value of benefits, which is based on projections of benefit payments to be made in the future. • Expected Return on Plan Assets—We project the future return on plan assets based on prior performance and future expectations for the types of investments held by the plans, as well as the expected long-term allocation of plan assets for these investments. These projected returns reduce the net benefit costs recorded currently. • Rate of Compensation Increase—For salary-related plans, we project employees’ annual pay increases, which are used to project employees’ pension benefits at retirement. • Mortality Assumptions—Assumptions about life expectancy of plan participants are used in the measurement of related plan obligations. Actuarial gains and losses are recognized annually in our consolidated statements of income in the fourth quarter and whenever a plan is determined to qualify for a remeasurement during a fiscal year. The remaining components of pension and OPEB plan expense, primarily service cost, interest cost and expected return on assets, are recorded on a monthly basis. The market-related value of assets equals the actual market value as of the date of measurement. During 2017 , we made changes to assumptions related to discount rates and expected rates of return on plan assets. We consider available information that we deem relevant when selecting each of these assumptions. In selecting the discount rates for the U.S. plans, we consider expected benefit payments on a plan-by-plan basis. As a result, the Company uses different discount rates for each plan depending on the demographics of participants and the expected timing of benefit payments. For 2017 , the discount rates were calculated using the results from a bond matching technique developed by Milliman, which matched the future estimated annual benefit payments of each respective plan against a portfolio of bonds of high quality to determine the discount rate. We believe our selected discount rates are determined using preferred methodology under authoritative accounting guidance and accurately reflect market conditions as of the December 31, 2017 measurement date. In selecting the discount rates for the foreign plans, we look at long-term yields on AA-rated corporate bonds when available. Our actuaries have developed yield curves based on the yields on the constituent bonds in the various indices as well as on other market indicators such as swap rates, particularly at the longer durations. For the Eurozone, we apply the Aon Hewitt yield curve to projected cash flows from the relevant plans to derive the discount rate. For the United Kingdom (“U.K.”), the discount rate is determined by applying the Aon Hewitt yield curve for typical schemes of similar duration to projected cash flows of Albemarle’s U.K. plan. In other countries where there is not a sufficiently deep market of high-quality corporate bonds, we set the discount rate by referencing the yield on government bonds of an appropriate duration. In estimating the expected return on plan assets, we consider past performance and future expectations for the types of investments held by the plan as well as the expected long-term allocation of plan assets to these investments. In projecting the rate of compensation increase, we consider past experience in light of movements in inflation rates. In October 2016, the Society of Actuaries (“SOA”) published an updated Mortality Improvement Scale, MP-2016. The updated improvement scale incorporates three additional years of mortality data (2012 – 2014) and a modification of two other input values to improve the model’s year-over-year stability. We utilized the same base mortality, SOA RP-2014 Adjusted to 2006 Total Dataset Mortality, but we revised our mortality assumption to incorporate the MP-2016 Mortality Improvement Scale for purposes of measuring our U.S. pension and OPEB obligations at December 31, 2016. In October 2017, the SOA published an updated Mortality Improvement Scale, MP-2017. The updated improvement scale incorporates an additional year of mortality data (2015). We utilized the same base mortality, SOA RP-2014 Adjusted to 2006 Total Dataset Mortality, but we revised our mortality assumption to incorporate the MP-2017 Mortality Improvement Scale for purposes of measuring our U.S. pension and OPEB obligations at December 31, 2017.
Stock-based Compensation Expense	Stock-based Compensation Expense The fair value of restricted stock awards, restricted stock unit awards and performance unit awards with a service condition are determined based on the number of shares or units granted and the quoted price of our common stock on the date of grant, and the fair value of stock options is determined using the Black-Scholes valuation model. The fair value of performance unit awards with a service condition and a market condition are estimated on the date of grant using a Monte Carlo simulation model. The fair value of these awards is determined after giving effect to estimated forfeitures. Such value is recognized as expense over the service period, which is generally the vesting period of the equity grant. To the extent restricted stock awards, restricted stock unit awards, performance unit awards and stock options are forfeited prior to vesting in excess of the estimated forfeiture rate, the corresponding previously recognized expense is reversed as an offset to operating expenses.
Income Taxes	Income Taxes We use the liability method for determining our income taxes, under which current and deferred tax liabilities and assets are recorded in accordance with enacted tax laws and rates. Under this method, the amounts of deferred tax liabilities and assets at the end of each period are determined using the tax rate expected to be in effect when taxes are actually paid or recovered. Future tax benefits are recognized to the extent that realization of such benefits is more likely than not. In order to record deferred tax assets and liabilities, we are following guidance under Financial Accounting Standards Board (“FASB”) Accounting Standards Update (“ASU”) 2015-17, which requires deferred tax assets and liabilities to be classified as noncurrent on the balance sheet, along with any related valuation allowance. Deferred income taxes are provided for the estimated income tax effect of temporary differences between the financial statement carrying amounts and the tax basis of existing assets and liabilities. Deferred tax assets are also provided for operating losses, capital losses and certain tax credit carryovers. A valuation allowance, reducing deferred tax assets, is established when it is more likely than not that some portion or all of the deferred tax assets will not be realized. The realization of such deferred tax assets is dependent upon the generation of sufficient future taxable income of the appropriate character. Although realization is not assured, we do not establish a valuation allowance when we believe it is more likely than not that a net deferred tax asset will be realized. We only recognize a tax benefit after concluding that it is more likely than not that the benefit will be sustained upon audit by the respective taxing authority based solely on the technical merits of the associated tax position. Once the recognition threshold is met, we recognize a tax benefit measured as the largest amount of the tax benefit that, in our judgment, is greater than 50% likely to be realized. Under current accounting guidance for uncertain tax positions, interest and penalties related to income tax liabilities are included in Income tax expense on the consolidated statements of income. We have designated the undistributed earnings of a portion of our foreign operations as indefinitely reinvested and as a result we do not provide for deferred income taxes on the unremitted earnings of these subsidiaries. If it is determined that cash can be repatriated with little to no tax consequences, we may choose to repatriate cash at that time. The enactment of the Tax Cuts and Jobs Act (“TCJA”) during the fourth quarter of 2017 includes a one-time transition tax on earnings of certain foreign subsidiaries, and as a result, all previously unremitted earnings for which no U.S. deferred tax liability had been accrued are now subject to U.S tax. Despite the U.S. taxation of these amounts, we intend to invest most or all of these earnings indefinitely outside of the U.S and do not provide for deferred income taxes on the unremitted earnings of these subsidiaries. Our foreign earnings are computed under U.S. federal tax earnings and profits, or E&P, principles. In general, to the extent our financial reporting book basis over tax basis of a foreign subsidiary exceeds these E&P amounts, deferred taxes have not been provided as they are essentially permanent in duration. The determination of the amount of such unrecognized deferred tax liability is not practicable. We provide for deferred income taxes on our undistributed earnings of foreign operations that are not deemed to be indefinitely invested. We will continue to evaluate our permanent reinvestment assertion taking into consideration the TCJA. The accounting is expected to be completed within the measurement period, as allowed under Staff Accounting Bulletin (“SAB”) 118.
Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income Accumulated other comprehensive (loss) income comprises principally foreign currency translation adjustments, amounts related to the revaluation of our euro-denominated senior notes which were designated as a hedge of our net investment in foreign operations in 2014, a realized loss on a forward starting interest rate swap entered into in 2014 which was designated as a cash flow hedge, and deferred income taxes related to the aforementioned items.
Foreign Currency Translation	Foreign Currency Translation The assets and liabilities of all foreign subsidiaries were prepared in their respective functional currencies and translated into U.S. Dollars based on the current exchange rate in effect at the balance sheet dates, while income and expenses were translated at average exchange rates for the periods presented. Translation adjustments are reflected as a separate component of equity. Foreign exchange transaction and revaluation (losses) gains were ($11.1) million , $2.4 million and $51.8 million for the years ended December 31, 2017 , 2016 and 2015 , respectively, and are included in Other (expenses) income, net, in our consolidated statements of income, with the unrealized portion included in Other, net, in our consolidated statements of cash flows. The gains in 2015 are primarily related to cash denominated in U.S. Dollars held by foreign subsidiaries where the European Union Euro serves as the functional currency, which was repatriated using the applicable transaction rates during the first quarter of 2015.
Derivative Financial Instruments	Derivative Financial Instruments We manage our foreign currency exposures by balancing certain assets and liabilities denominated in foreign currencies and through the use of foreign currency forward contracts from time to time, which generally expire within one year . The principal objective of such contracts is to minimize the financial impact of changes in foreign currency exchange rates. While these contracts are subject to fluctuations in value, such fluctuations are generally expected to be offset by changes in the value of the underlying foreign currency exposures being hedged. Unless otherwise noted, gains and losses on foreign currency forward contracts are recognized currently in Other (expenses) income, net, and generally do not have a significant impact on results of operations. We may also enter into interest rate swaps, collars or similar instruments from time to time, with the objective of reducing interest rate volatility relating to our borrowing costs. The counterparties to these contractual agreements are major financial institutions with which we generally have other financial relationships. We are exposed to credit loss in the event of nonperformance by these counterparties. However, we do not anticipate nonperformance by the counterparties. We do not utilize financial instruments for trading or other speculative purposes. Our foreign currency forward contracts outstanding at December 31, 2017 and 2016 have not been designated as hedging instruments under Accounting Standards Codification (“ASC”) 815, Derivatives and Hedging .
Recently Issued Accounting Pronouncements	Recently Issued Accounting Pronouncements In May 2014, the FASB issued accounting guidance designed to enhance comparability of revenue recognition practices across entities, industries, jurisdictions and capital markets. The core principle of the guidance is that revenue recognized from a transaction or event that arises from a contract with a customer should reflect the consideration to which an entity expects to be entitled in exchange for goods or services provided. To achieve that core principle the new guidance sets forth a five-step revenue recognition model that will need to be applied consistently to all contracts with customers, except those that are within the scope of other topics in the ASC. Also required are new disclosures to help users of financial statements better understand the nature, amount, timing and uncertainty of revenues and cash flows from contracts with customers. The new disclosures include qualitative and quantitative information about contracts with customers, significant judgments made in applying the revenue guidance, and assets recognized related to the costs to obtain or fulfill a contract. During 2016, the FASB issued amendments to this new guidance that provided clarification, technical corrections and practical expedients. Topics of potential relevance to the Company include principal versus agent considerations, collectability, presentation of sales tax from customers, contract modifications at transition and accounting transition. We will adopt the new standard in the first quarter of 2018 using the modified retrospective method. We have evaluated our existing contracts and accounting policies and do not expect the adoption of this standard to have a material impact on our consolidated financial statements. We have implemented, or will implement in the first quarter of 2018, appropriate changes to the business processes, controls and control activities to support recognition, presentation and disclosure under the new standard for the first quarter of 2018, however, we have not made any significant changes to our existing systems as a result of this new standard. In addition, we continue to assess the new presentation and disclosures that will be required in our first quarter 2018 Form 10-Q. In July 2015, the FASB issued accounting guidance that requires inventory to be measured at the lower of cost and net realizable value. The scope of this guidance excludes inventory measured using the last-in, first-out method or the retail inventory method. This new requirement became effective on January 1, 2017 and did not have a significant impact on our consolidated financial statements. In February 2016, the FASB issued accounting guidance that requires assets and liabilities arising from leases to be recorded on the balance sheet. Additional disclosures are required regarding the amount, timing, and uncertainty of cash flows from leases. This new guidance will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and is to be applied using a modified retrospective approach. Early application is permitted. The impact of this new requirement on our consolidated financial statements is being assessed and is not yet known. In March 2016, the FASB issued accounting guidance that simplifies several aspects of the accounting for share-based payment awards. Among other things, this guidance requires all tax effects related to share-based payment awards to be recognized as income tax expense or benefit on the income statement, thus eliminating all additional paid-in capital pools. An entity should recognize excess tax benefits regardless of whether the benefit reduces income taxes payable in the current period. For interim reporting purposes, excess tax benefits and tax deficiencies should be accounted for as discrete items in the reporting period in which they occur. Additionally, this new guidance requires all tax related cash flows resulting from share-based payments to be presented as an operating activity on the statement of cash flows rather than as a financing activity. This guidance became effective on January 1, 2017. The impact of recognizing excess tax benefits in the income sta tement resulted in a $8.8 million red uction in Income ta x expense for the year ended December 31, 2017. The remaining aspects of adopting this guidance did not have a material impact on our consolidated financial statements. In August 2016, the FASB issued accounting guidance which clarifies the proper presentation and classification of certain cash receipts and cash payments in the statement of cash flows. The new guidance addresses cash flow issues including, but not limited to, debt prepayments or debt extinguishment costs and distributions received from equity method investments. As allowed by the provisions of this new guidance, we early-adopted this new guidance in the first quarter of 2017. The adoption of this new guidance did not have a significant impact on our consolidated financial statements. In November 2016, the FASB issued accounting guidance that requires restricted cash and restricted cash equivalents to be included with cash and cash equivalents when reconciling the beginning and end of period total amounts shown on the statement of cash flows. This guidance will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and is to be applied on a retrospective basis. Early adoption is permitted. We do not expect this guidance to have a significant impact on our consolidated financial statements. In January 2017, the FASB issued accounting guidance to clarify the definition of a business for determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. This guidance will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and is to be applied on a prospective basis. Early adoption is permitted. We currently do not expect this guidance to have a significant impact on our consolidated financial statements. In January 2017, the FASB issued accounting guidance to simplify the accounting for goodwill impairment. The guidance removes Step 2 of the goodwill impairment test, which requires a reporting unit to calculate the implied fair value of goodwill by assigning the fair value of a reporting unit to all of its assets and liabilities as if that reporting unit has been acquired in a business combination. A goodwill impairment will now be the amount by which a reporting unit’s carrying value exceeds its fair value, not to exceed the carrying amount of goodwill. All other goodwill impairment guidance will remain unchanged. Entities will continue to have the option to perform a qualitative assessment to determine if a quantitative impairment test is necessary. This guidance will be effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years, and is to be applied on a prospective basis. Early adoption is permitted for goodwill impairment tests performed after January 1, 2017. We do not expect this guidance to have a significant impact on our consolidated financial statements. In March 2017, the FASB issued accounting guidance that changes the presentation of net periodic pension and postretirement benefit cost (“net benefit cost”) in the income statement. This new guidance requires service cost to be presented as part of operating income (expense) and all other components of net benefit cost are to be shown outside of operations. This guidance will be effective for periods beginning after December 15, 2017, including interim periods within those fiscal years, and is to be applied on a retrospective basis. Early adoption is permitted as of the beginning of an annual period for which an entity’s financial statements have not been issued or made available for issuance. We do not expect this guidance to have a significant impact on our consolidated financial statements. In May 2017, the FASB issued accounting guidance to clarify when to account for a change to the terms or conditions of a share-based payment award as a modification. Under the new guidance, modification accounting is required only if the fair value, the vesting conditions, or the classification of the award (as equity or liability) changes as a result of the change in terms or conditions. This new guidance will be effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, and is to be applied on a prospective basis. Early adoption is permitted. We currently do not expect this guidance to have a significant impact on our consolidated financial statements. In August 2017, the FASB issued accounting guidance to better align an entity’s risk management activities with hedge accounting, simply the application of hedge accounting, and increase transparency as to the scope and results of hedging programs. This guidance will make more financial and nonfinancial hedging strategies eligible for hedge accounting. It also amends the presentation and disclosure requirements and changes how companies assess effectiveness. This new guidance will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years, and is to be applied on a prospective basis. Early adoption is permitted. We currently do not expect this guidance to have a significant impact on our consolidated financial statements. In February 2018, the FASB issued accounting guidance that will give companies the option to reclassify stranded tax effects caused by the newly-enacted TCJA from accumulated other comprehensive income to retained earnings. This new guidance will be effective for fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. Early adoption is permitted for reporting periods for which financial statements have not yet been issued or made available for issuance. Entities will have the option to apply this guidance retrospectively or to record the reclassification as of the beginning of the period of adoption. We are currently assessing the impact of this new guidance on our financial statements.

Acquisitions (Tables)

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2017
Rockwood Holdings, Inc.
Business Acquisition [Line Items]
Business Acquisition, Pro Forma Information	The following unaudited pro forma results of operations of the Company for the year ended December 31, 2015 assume that the Merger occurred on January 1, 2014. The pro forma amounts include certain adjustments, including interest expense, depreciation, amortization expense and income taxes. The pro forma amounts for the year ended December 31, 2015 were adjusted to exclude approximately $137.7 million of nonrecurring acquisition and integration related costs. Additionally, pro forma amounts for the year ended December 31, 2015 were adjusted to exclude approximately $103.4 million of charges related to the utilization of the inventory markup as further described in Note 24, “Segment and Geographic Area Information.” The pro forma results do not include adjustments related to cost savings or other synergies anticipated as a result of the Merger. In addition, pro forma amounts are not adjusted to reflect the Chemetall Surface Treatment business as discontinued operations. Accordingly, these unaudited pro forma results are presented for informational purposes only and are not necessarily indicative of what the actual results of operations of the combined company would have been if the acquisition had occurred as of January 1, 2014, nor are they indicative of future results of operations. Year Ended December 31, 2015 (in thousands, except per share amounts) Pro forma Net sales $ 3,684,665 Pro forma Net income $ 527,997 Pro forma Net income per share: Basic $ 4.75 Diluted $ 4.73

Divestitures (Tables)

Divestitures (Tables)	12 Months Ended
	Dec. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations [Table Text Block]	The carrying amounts of the major classes of assets and liabilities that were classified as held for sale at December 31, 2017, are as follows (in thousands): Assets Current assets $ 39,152 Net property, plant and equipment 121,759 Goodwill 14,422 Other intangibles, net of amortization 3,632 Assets held for sale $ 178,965 Liabilities Current liabilities $ 1,938 Noncurrent liabilities 614 Liabilities held for sale $ 2,552 Depreciation and amortization and capital expenditures from discontinued operations for the years ended December 31, 2016 and 2015 were as follows (in thousands): Year Ended December 31, 2016 2015 Depreciation and amortization $ 35,194 $ 78,903 Capital expenditures $ 19,281 $ 23,738 The major components of Income from discontinued operations (net of tax) for the years ended December 31, 2016 and 2015 were as follows (in thousands): Year Ended December 31, 2016 2015 Net sales $ 813,285 $ 824,906 Cost of goods sold 416,934 488,267 Operating expenses, net (a) 268,402 239,316 Interest and financing expenses (b) 38,227 51,072 Other income, net (2,485 ) (4,214 ) Gain on sale of discontinued operations (387,980 ) — Income before income taxes 480,187 50,465 Income tax expense (c) 278,056 17,989 Income from discontinued operations (net of tax) $ 202,131 $ 32,476 (a) Operating expenses, net for discontinued operations includes mark-to market actuarial (losses) gains of ($8.5) million and $8.9 million during the years ended December 31, 2016 and 2015, respectively. (b) Interest and financing expenses included the allocation of interest expense not directly attributab le to other operations as well as interest expense related to debt to be assumed by the buyer. The allocation of interest expense to discontinued operations was based on the ratio of net assets held for sale to the sum of total net assets plus consolidated debt. (c) Income tax expense for the year ended December 31, 2016 included a charge of $253.0 million related to the gain on sale of discontinued operations.

Supplemental Cash Flow Inform36

Supplemental Cash Flow Information (Tables)	12 Months Ended
	Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]
Supplemental Information Related to Consolidated Statements of Cash Flows	Supplemental information related to the consolidated statements of cash flows is as follows (in thousands): Year Ended December 31, 2017 2016 2015 Cash paid during the year for: Income taxes (net of refunds of $17,522, $9,270 and $7,333 in 2017, 2016 and 2015, respectively) (a) $ 320,222 $ 143,404 $ 162,408 Interest (net of capitalization) $ 61,243 $ 96,948 $ 153,271 Supplemental non-cash disclosures related to investing activities: Capital expenditures included in Accounts payable $ 89,188 $ 33,622 $ 45,826 (a) Includes approximately $257 million of income taxes paid in 2017 from the gain on sale of the Chemetall Surface Treatment business and approximately $111 million of income taxes paid in 2015 on repatriation of earnings from legacy Rockwood entities.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2017
Earnings Per Share [Abstract]
Calculation of Basic and Diluted Earnings Per Share	Basic and diluted earnings per share from continuing operations are calculated as follows (in thousands, except per share amounts): Year Ended December 31, 2017 2016 2015 Basic earnings per share from continuing operations Numerator: Net income from continuing operations $ 99,468 $ 478,638 $ 327,588 Net income from continuing operations attributable to noncontrolling interests (44,618 ) (37,094 ) (25,158 ) Net income from continuing operations attributable to Albemarle Corporation $ 54,850 $ 441,544 $ 302,430 Denominator: Weighted-average common shares for basic earnings per share 110,914 112,379 111,182 Basic earnings per share from continuing operations $ 0.49 $ 3.93 $ 2.72 Diluted earnings per share from continuing operations Numerator: Net income from continuing operations $ 99,468 $ 478,638 $ 327,588 Net income from continuing operations attributable to noncontrolling interests (44,618 ) (37,094 ) (25,158 ) Net income from continuing operations attributable to Albemarle Corporation $ 54,850 $ 441,544 $ 302,430 Denominator: Weighted-average common shares for basic earnings per share 110,914 112,379 111,182 Incremental shares under stock compensation plans 1,466 860 374 Weighted-average common shares for diluted earnings per share 112,380 113,239 111,556 Diluted earnings per share from continuing operations $ 0.49 $ 3.90 $ 2.71

Other Accounts Receivable (Tabl

Other Accounts Receivable (Tables)	12 Months Ended
	Dec. 31, 2017
Receivables [Abstract]
Other Accounts Receivable	Other accounts receivable consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Value added tax/consumption tax $ 23,158 $ 15,324 Other 14,779 26,661 Total $ 37,937 $ 41,985

Inventories (Tables)

Inventories (Tables)	12 Months Ended
	Dec. 31, 2017
Inventory Disclosure [Abstract]
Breakdown of Inventories	The following table provides a breakdown of inventories at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Finished goods (a) $ 404,239 $ 289,102 Raw materials and work in process (b) 132,891 109,706 Stores, supplies and other 55,651 51,455 Total (c) $ 592,781 $ 450,263 (a) Increase primarily due to the Jiangli New Materials acquisition and the build up of inventory at other Lithium sites for an increase in sales in 2018. (b) Included $59.6 million and $47.1 million at December 31, 2017 and 2016 , respectively, of work in process related to the Lithium product category. (c) As of December 31, 2017, $24.7 million of Inventories were classified as Assets held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

Other Current Assets (Tables)

Other Current Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Other Assets [Abstract]
Other Current Assets	Other current assets consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Income tax receivables $ 47,130 $ 15,085 Prepaid expenses 86,348 42,240 Other 2,586 1,254 Total $ 136,064 $ 58,579

Property, Plant and Equipment (

Property, Plant and Equipment (Tables)	12 Months Ended
	Dec. 31, 2017
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment, at Cost	Property, plant and equipment, at cost, consist of the following at December 31, 2017 and 2016 (in thousands): Useful Lives (Years) December 31, 2017 2016 Land — $ 118,428 $ 120,842 Land improvements 10 – 30 63,328 59,387 Buildings and improvements 10 – 45 245,482 256,603 Machinery and equipment (a) 2 – 45 2,627,667 2,501,481 Long-term mineral rights and production equipment costs 7 – 60 675,832 654,006 Construction in progress — 393,598 318,203 Total (b) $ 4,124,335 $ 3,910,522 (a) Consists primarily of (1) short-lived production equipment components, office and building equipment and other equipment with estimated lives ranging 2 – 7 years, (2) production process equipment (intermediate components) with estimated lives ranging 8 – 19 years, (3) production process equipment (major unit components) with estimated lives ranging 20 – 29 years, and (4) production process equipment (infrastructure and other) with estimated lives ranging 30 – 45 years. (b) As of December 31, 2017, $215.9 million of Property, plant and equipment, at cost, was classified as Assets held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

Investments (Tables)

Investments (Tables)	12 Months Ended
	Dec. 31, 2017
Investments [Abstract]
Investment Balances	The following table details our investment balances at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Joint ventures $ 499,756 $ 429,794 Nonmarketable securities 3,655 169 Marketable equity securities 30,653 27,570 Total $ 534,064 $ 457,533
Ownership Positions in Significant Unconsolidated Investments	Our ownership positions in significant unconsolidated investments are shown below: December 31, 2017 2016 2015 * Windfield Holdings Pty. Ltd. - a joint venture with Sichuan Tianqi Lithium Industries, Inc., that mines lithium ore and produces lithium concentrate 49 % 49 % 49 % * Nippon Aluminum Alkyls - a joint venture with Mitsui Chemicals, Inc. that produces aluminum alkyls 50 % 50 % 50 % * Magnifin Magnesiaprodukte GmbH & Co. KG - a joint venture with Radex Heraklith Industriebeteiligung AG that produces specialty magnesium hydroxide products (a) — % — % 50 % * Nippon Ketjen Company Limited - a joint venture with Sumitomo Metal Mining Company Limited that produces refinery catalysts 50 % 50 % 50 % * Eurecat S.A. - a joint venture with Axens Group for refinery catalysts regeneration services 50 % 50 % 50 % * Fábrica Carioca de Catalisadores S.A. - a joint venture with Petrobras Quimica S.A. - PETROQUISA that produces catalysts and includes catalysts research and product development activities 50 % 50 % 50 % (a) On February 1, 2016, we sold our investment in Magnifin as part of the sale of the minerals-based flame retardants and specialty chemicals business. Refer to Note 3, “Divestitures,” for additional information.
Summary of Assets, Liabilities and Results of Operations for Significant Unconsolidated Joint Ventures	The following summary lists our assets, liabilities and results of operations for our significant unconsolidated joint ventures presented herein (in thousands): December 31, 2017 2016 Summary of Balance Sheet Information: Current assets $ 503,043 $ 383,203 Noncurrent assets 1,041,519 913,643 Total assets $ 1,544,562 $ 1,296,846 Current liabilities $ 133,670 $ 138,474 Noncurrent liabilities 405,662 319,801 Total liabilities $ 539,332 $ 458,275 Year Ended December 31, 2017 2016 2015 Summary of Statements of Income Information: Net sales $ 687,561 $ 590,980 $ 560,376 Gross profit $ 353,577 $ 267,241 $ 253,569 Income before income taxes $ 267,805 $ 189,016 $ 157,501 Net income $ 184,777 $ 126,872 $ 111,491

Other Assets (Tables)

Other Assets (Tables)	12 Months Ended
	Dec. 31, 2017
Other Assets, Noncurrent [Abstract]
Other Assets	Other assets consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Deferred income taxes (a) $ 25,108 $ 61,132 Assets related to unrecognized tax benefits (a) 14,601 15,076 Other (b) 34,455 66,112 Total $ 74,164 $ 142,320 (a) See Note 1, “Summary of Significant Accounting Policies” and Note 20, “Income Taxes.” (b) As of December 31, 2017, a $28.7 million reserve was recorded against a note receivable on one of our European entities no longer deemed probable of collection.

Goodwill and Other Intangibles

Goodwill and Other Intangibles (Tables)	12 Months Ended
	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Changes in Goodwill	The following table summarizes the changes in goodwill by reportable segment for the years ended December 31, 2017 and 2016 (in thousands): Lithium and Advanced Materials Bromine Specialties Refining Solutions All Other Total Balance at December 31, 2015 $ 1,267,505 $ 20,319 $ 172,728 $ — $ 1,460,552 Acquisition of Rockwood (a) (1,706 ) — — — (1,706 ) Other acquisitions (b) 113,555 — — — 113,555 Reclass from assets held for sale (c) — — — 6,586 6,586 Foreign currency translation adjustments (31,093 ) — (7,862 ) — (38,955 ) Balance at December 31, 2016 1,348,261 20,319 164,866 6,586 1,540,032 Other acquisitions (d) (26,151 ) — — — (26,151 ) Reclass to assets held for sale (e) (14,422 ) — — — (14,422 ) Foreign currency translation adjustments and other 88,452 — 22,444 — 110,896 Balance at December 31, 2017 $ 1,396,140 $ 20,319 $ 187,310 $ 6,586 $ 1,610,355 (a) Represents final purchase price adjustments for the Rockwood acquisition recorded for the year ended December 31, 2016. Excludes $3.2 million of final purchase price adjustments for businesses reported as discontinued operations. (b) Represents preliminary purchase price adjustments for the Jiangli New Materials acquisition recorded for the year ended December 31, 2016. See Note 2, “Acquisitions,” for additional information. (c) Represents Goodwill of the fine chemistry services business, which was reported in Assets held for sale on the consolidated balance sheets as of December 31, 2015, but reclassified back to Goodwill during the year end December 31, 2016. See Note 3, “Divestitures,” for additional information. (d) Primarily represents final purchase price adjustments for the Jiangli New Materials acquisition recorded for the year ended December 31, 2017. See Note 2, “Acquisitions,” for additional information. (e) Represents Goodwill of the polyolefin catalysts and components portion of the PCS business. See Note 3, “Divestitures,” for additional information.
Other Intangibles	Other intangibles consist of the following at December 31, 2017 and 2016 (in thousands): Customer Lists and Relationships Trade Names and Trademarks (a) Patents and Technology Other Total Gross Asset Value Balance at December 31, 2015 $ 398,725 $ 16,923 $ 40,144 $ 17,779 $ 473,571 Reclass from assets held for sale (b) — — — 1,454 1,454 Foreign currency translation adjustments and other (10,832 ) (409 ) (1,710 ) (389 ) (13,340 ) Balance at December 31, 2016 387,893 16,514 38,434 18,844 461,685 Acquisitions (c) 19,225 1,429 20,381 18,847 59,882 Reclass to assets held for sale (d) — — — (4,228 ) (4,228 ) Foreign currency translation adjustments and other 32,194 1,038 2,803 3,793 39,828 Balance at December 31, 2017 $ 439,312 $ 18,981 $ 61,618 $ 37,256 $ 557,167 Accumulated Amortization Balance at December 31, 2015 $ (32,656 ) $ (8,086 ) $ (32,008 ) $ (16,953 ) $ (89,703 ) Amortization (18,034 ) — (574 ) (431 ) (19,039 ) Reclass from assets held for sale (b) — — — (1,322 ) (1,322 ) Foreign currency translation adjustments and other 1,525 134 899 385 2,943 Balance at December 31, 2016 (49,165 ) (7,952 ) (31,683 ) (18,321 ) (107,121 ) Amortization (21,288 ) — (1,412 ) (2,379 ) (25,079 ) Reclass to assets held for sale (d) — — — 596 596 Foreign currency translation adjustments and other (4,251 ) (343 ) (2,108 ) 2,642 (4,060 ) Balance at December 31, 2017 $ (74,704 ) $ (8,295 ) $ (35,203 ) $ (17,462 ) $ (135,664 ) Net Book Value at December 31, 2016 $ 338,728 $ 8,562 $ 6,751 $ 523 $ 354,564 Net Book Value at December 31, 2017 $ 364,608 $ 10,686 $ 26,415 $ 19,794 $ 421,503 (a) Balances as of December 31, 2016 and 2017 include only indefinite-lived intangible assets. (b) Represents Other intangibles and related amortization of the fine chemistry services business, which was reported in Assets held for sale on the consolidated balance sheets as of December 31, 2015, but reclassified back to Other intangibles during the year end December 31, 2016. See Note 3, “Divestitures,” for additional information. (c) Represents final purchase price adjustments for the Jiangli New Materials acquisition and the acquisition of the remaining equity interest in Salmag. See Note 2, “Acquisitions,” for additional information. (d) Represents Other intangibles and related amortization of the polyolefin catalysts and components portion of the PCS business. See Note 3, “Divestitures,” for additional information.
Total Estimated Amortization Expense of Other Intangibles for Next Five Fiscal Years	Total estimated amortization expense of other intangibles for the next five fiscal years is as follows (in thousands): Estimated Amortization Expense 2018 $ 27,166 2019 $ 27,461 2020 $ 25,035 2021 $ 24,756 2022 $ 24,162

Accrued Expenses (Tables)

Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued Expenses	Accrued expenses consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Employee benefits, payroll and related taxes $ 93,393 $ 92,478 Obligations in connection with acquisitions (a) — 47,082 Other (b) 174,943 182,605 Total (c) $ 268,336 $ 322,165 (a) As of December 31, 2016 included accruals related to net working capital amounts arising from the acquisition of the lithium business of Jiangli New Materials. (b) No individual component exceeds 5% of total current liabilities. (c) As of December 31, 2017, $0.8 million of Accrued expenses were classified as Liabilities held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

Long-Term Debt (Tables)

Long-Term Debt (Tables)	12 Months Ended
	Dec. 31, 2017
Debt Disclosure [Abstract]
Long-Term Debt	Long-term debt consisted of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 1.875% Senior notes, net of unamortized discount and debt issuance costs of $3,971 at December 31, 2017 and $7,823 at December 31, 2016 463,575 719,617 3.00% Senior notes, net of unamortized discount and debt issuance costs of $1,286 at December 31, 2016 — 248,714 4.15% Senior notes, net of unamortized discount and debt issuance costs of $3,372 at December 31, 2017 and $3,859 at December 31, 2016 421,628 421,141 4.50% Senior notes, net of unamortized discount and debt issuance costs of $891 at December 31, 2017 and $2,380 at December 31, 2016 174,325 347,620 5.45% Senior notes, net of unamortized discount and debt issuance costs of $4,159 at December 31, 2017 and $4,313 at December 31, 2016 345,841 345,687 Commercial paper notes 421,321 247,503 Variable-rate foreign bank loans 5,298 38,939 Other 5,384 41 Total long-term debt 1,837,372 2,369,262 Less amounts due within one year 422,012 247,544 Long-term debt, less current portion $ 1,415,360 $ 2,121,718

Pension Plans and Other Postr47

Pension Plans and Other Postretirement Benefits (Tables)	12 Months Ended
	Dec. 31, 2017
Financial Assets Accounted for at Fair Value on Recurring Basis	The following tables set forth the assets of our pension and postretirement plans that were accounted for at fair value on a recurring basis as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Pension Assets: Domestic Equity (a) $ 163,160 $ 160,976 $ 2,184 $ — International Equity (b) 130,935 101,366 29,569 — Fixed Income (c) 269,365 231,506 37,859 — Absolute Return Measured at Net Asset Value (d) 96,414 — — — Total Pension Assets $ 659,874 $ 493,848 $ 69,612 $ — Postretirement Assets: Fixed Income (c) $ 834 $ — $ 834 $ — December 31, 2016 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Pension Assets: Domestic Equity (a) $ 146,683 $ 143,987 $ 2,696 $ — International Equity (b) 116,649 83,839 32,810 — Fixed Income (c) 255,401 230,309 25,092 — Absolute Return Measured at Net Asset Value (d) 86,112 — — — Cash 2,112 2,112 — — Total Pension Assets $ 606,957 $ 460,247 $ 60,598 $ — Postretirement Assets: Fixed Income (c) $ 2,232 $ — $ 2,232 $ — (a) Consists primarily of U.S. stock funds that track or are actively managed and measured against the S&P 500 index. (b) Consists primarily of international equity funds which invest in common stocks and other securities whose value is based on an international equity index or an underlying equity security or basket of equity securities. (c) Consists primarily of debt obligations issued by governments, corporations, municipalities and other borrowers. Also includes insurance policies. (d) Consists primarily of funds with holdings in private investment companies. See additional information about the Absolute Return investments below. Holdings in private investment companies are measured at fair value using the net asset value per share as a practical expedient and have not been categorized in the fair value hierarchy. The fair value amounts of $96.4 million and $86.1 million as of December 31, 2017 and 2016, respectively, are included in this table to permit reconciliation to the reconciliation of plan assets table above.
Schedule of Allocation of Plan Assets	The weighted-average target allocations as of the measurement date are as follows: Target Allocation Equity securities 43 % Fixed income 44 % Absolute return 13 %
Current Forecast of Benefit Payments, which Reflect Expected Future Service	The current forecast of benefit payments, which reflects expected future service, amounts to (in millions): U.S. Pension Plans Foreign Pension Plans Other Postretirement Benefits 2018 $ 41.2 $ 13.9 $ 4.6 2019 $ 43.2 $ 9.1 $ 4.4 2020 $ 43.9 $ 10.2 $ 4.2 2021 $ 44.3 $ 10.8 $ 3.9 2022 $ 44.6 $ 10.0 $ 3.9 2023-2027 $ 224.2 $ 59.0 $ 18.2
Pension Plans
Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Plans	The following provides a reconciliation of benefit obligations, plan assets and funded status, as well as a summary of significant assumptions, for our defined benefit pension plans (in thousands): Year Ended December 31, 2017 Year Ended December 31, 2016 U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans Change in benefit obligations: Benefit obligation at January 1 $ 665,688 $ 246,280 $ 682,839 $ 245,747 Service cost 985 2,547 1,028 3,133 Interest cost 28,614 5,128 30,514 6,570 Actuarial loss 30,539 2,783 7,357 28,083 Benefits paid (39,863 ) (9,524 ) (56,050 ) (9,793 ) Divestitures — — — (6,372 ) Employee contributions — 215 — 245 Foreign exchange loss (gain) — 30,711 — (21,724 ) Settlements/curtailments — (3,065 ) — (427 ) Other — (69 ) — 818 Benefit obligation at December 31 $ 685,963 $ 275,006 $ 665,688 $ 246,280 Change in plan assets: Fair value of plan assets at January 1 $ 538,082 $ 68,875 $ 555,084 $ 64,911 Actual return on plan assets 80,613 6,260 37,725 12,534 Employer contributions 1,564 9,316 1,323 10,911 Benefits paid (39,863 ) (9,524 ) (56,050 ) (9,793 ) Employee contributions — 215 — 245 Foreign exchange gain (loss) — 7,470 — (10,492 ) Settlements/curtailments — (3,065 ) — — Other — (69 ) — 559 Fair value of plan assets at December 31 $ 580,396 $ 79,478 $ 538,082 $ 68,875 Funded status at December 31 $ (105,567 ) $ (195,528 ) $ (127,606 ) $ (177,405 ) December 31, 2017 December 31, 2016 U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans Amounts recognized in consolidated balance sheets: Current liabilities (accrued expenses) $ (1,267 ) $ (5,217 ) $ (1,100 ) $ (5,216 ) Noncurrent liabilities (pension benefits) (104,300 ) (190,311 ) (126,506 ) (172,189 ) Net pension liability $ (105,567 ) $ (195,528 ) $ (127,606 ) $ (177,405 ) Amounts recognized in accumulated other comprehensive (loss) income: Prior service benefit $ (60 ) $ (269 ) $ (136 ) $ (322 ) Net amount recognized $ (60 ) $ (269 ) $ (136 ) $ (322 ) Weighted-average assumptions used to determine benefit obligations at December 31: Discount rate 4.03 % 1.94 % 4.43 % 2.00 % Rate of compensation increase — % 3.18 % — % 3.18 %
Components of Pension and Postretirement Benefits Expense	The components of pension benefits (credit) cost from continuing operations are as follows (in thousands): Year Ended Year Ended Year Ended December 31, 2017 December 31, 2016 December 31, 2015 U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans U.S. Pension Plans Foreign Pension Plans Service cost $ 985 $ 2,547 $ 1,028 $ 3,133 $ 1,233 $ 3,909 Interest cost 28,614 5,128 30,514 6,570 30,235 6,405 Expected return on assets (36,243 ) (4,441 ) (36,445 ) (4,027 ) (40,495 ) (3,670 ) Actuarial (gain) loss (13,910 ) 483 5,988 19,418 2,665 (27,043 ) Amortization of prior service benefit 75 56 75 859 75 43 Total net pension benefits (credit) cost (a) $ (20,479 ) $ 3,773 $ 1,160 $ 25,953 $ (6,287 ) $ (20,356 ) Weighted-average assumption percentages: Discount rate 4.43 % 2.00 % 4.67 % 2.76 % 4.19 % 2.22 % Expected return on plan assets 6.89 % 6.16 % 6.89 % 6.66 % 6.88 % 5.76 % Rate of compensation increase — % 3.18 % — % 3.16 % — % 3.15 % (a) For the years ended December 31, 2016 and 2015, $10.8 million and $6.2 million , respectively, of net pension benefits credit is included in Income from discontinued operations (net of tax) in the consolidated statements of income. See Note 3, “Divestitures,” for additional information.
Estimated Amounts to Be Amortized from Accumulated Other Comprehensive Income	The estimated amounts to be amortized from accumulated other comprehensive loss into net periodic pension costs during 2018 are as follows (in thousands): U.S. Pension Plans Foreign Pension Plans Amortization of prior service benefit $ 60 $ 40
Other Postretirement Benefits
Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Plans	The following provides a reconciliation of benefit obligations, plan assets and funded status, as well as a summary of significant assumptions, for our postretirement benefit plans (in thousands): Year Ended December 31, 2017 2016 Other Postretirement Benefits Other Postretirement Benefits Change in benefit obligations: Benefit obligation at January 1 $ 56,141 $ 56,499 Service cost 121 115 Interest cost 2,340 2,483 Actuarial loss 2,008 1,529 Benefits paid (3,963 ) (4,485 ) Benefit obligation at December 31 $ 56,647 $ 56,141 Change in plan assets: Fair value of plan assets at January 1 $ 2,232 $ 3,292 Actual return on plan assets 104 442 Employer contributions 2,461 2,983 Benefits paid (3,963 ) (4,485 ) Fair value of plan assets at December 31 $ 834 $ 2,232 Funded status at December 31 $ (55,813 ) $ (53,909 ) December 31, 2017 2016 Other Postretirement Benefits Other Postretirement Benefits Amounts recognized in consolidated balance sheets: Current liabilities (accrued expenses) $ (3,810 ) $ (3,371 ) Noncurrent liabilities (postretirement benefits) (52,003 ) (50,538 ) Net postretirement liability $ (55,813 ) $ (53,909 ) Amounts recognized in accumulated other comprehensive (loss) income: Prior service benefit $ 48 $ 143 Net amount recognized $ 48 $ 143 Weighted-average assumptions used to determine benefit obligations at December 31: Discount rate 3.99 % 4.35 % Rate of compensation increase 3.50 % 3.50 %
Components of Pension and Postretirement Benefits Expense	The components of postretirement benefits cost (credit) from continuing operations are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Other Postretirement Benefits Other Postretirement Benefits Other Postretirement Benefits Service cost $ 121 $ 115 $ 137 Interest cost 2,340 2,483 2,573 Expected return on assets (110 ) (187 ) (263 ) Actuarial loss (gain) 2,014 1,275 (5,707 ) Amortization of prior service benefit (95 ) (95 ) (95 ) Total net postretirement benefits cost (credit) (a) $ 4,270 $ 3,591 $ (3,355 ) Weighted-average assumption percentages: Discount rate 4.35 % 4.59 % 4.15 % Expected return on plan assets 7.00 % 7.00 % 7.00 % Rate of compensation increase 3.50 % 3.50 % 3.50 % (a) For the year ended December 31, 2015, $2.6 million of net postretirement benefits credit is included in Income from discontinued operations (net of tax) in the consolidated statements of income. See Note 3, “Divestitures,” for additional information.
Estimated Amounts to Be Amortized from Accumulated Other Comprehensive Income	The estimated amounts to be amortized from accumulated other comprehensive loss into net periodic postretirement costs during 2018 are as follows (in thousands): Other Postretirement Benefits Amortization of prior service benefit $ (48 )

Other Noncurrent Liabilities (T

Other Noncurrent Liabilities (Tables)	12 Months Ended
	Dec. 31, 2017
Other Liabilities, Noncurrent [Abstract]
Other Noncurrent Liabilities	Other noncurrent liabilities consist of the following at December 31, 2017 and 2016 (in thousands): December 31, 2017 2016 Transition tax on foreign earnings (a) $ 394,878 $ — Liabilities related to uncertain tax positions (b) 24,369 27,919 Executive deferred compensation plan obligation 25,494 22,037 Environmental liabilities (c) 37,518 32,595 Asset retirement obligations (c) 40,450 36,296 Tax indemnification liability (d) 42,707 38,255 Other (e) 33,758 37,708 Total (f) $ 599,174 $ 194,810 (a) Noncurrent portion of one-time transition tax on foreign earnings. See Note 20, “Income Taxes,” for additional information. (b) See Note 20, “Income Taxes.” (c) See Note 17, “Commitments and Contingencies.” (d) Indemnification of certain income and non-income tax liabilities associated with the Chemetall Surface Treatment entities sold. (e) No individual component exceeds 5% of total liabilities. (f) As of December 31, 2017, $0.6 million of Other noncurrent liabilities were classified as Liabilities held for sale in the consolidated balance sheets. See Note 3, “Divestitures,” for additional information.

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Activity in Recorded Environmental Liabilities Activity	We had the following activity in our recorded environmental liabilities for the years ended December 31, 2017 , 2016 and 2015 (in thousands): Year Ended December 31, 2017 2016 2015 Balance, beginning of year $ 34,919 $ 31,436 $ 9,235 Expenditures (1,818 ) (2,667 ) (4,039 ) Acquisition of Rockwood — — 34,626 Divestitures — — (1,826 ) Accretion of discount 896 793 902 Additions and revisions of estimates 3,344 4,004 150 Reclass to liabilities held for sale (a) — — (5,253 ) Foreign currency translation adjustments and other 2,467 1,353 (2,359 ) Balance, end of year 39,808 34,919 31,436 Less amounts reported in Accrued expenses 2,290 2,324 1,443 Amounts reported in Other noncurrent liabilities $ 37,518 $ 32,595 $ 29,993 (a) Represents environmental liabilities of the metal sulfides and minerals-based flame retardants and specialty chemicals businesses. See Note 3, “Divestitures,” for additional information.
Schedule of Change in Asset Retirement Obligation	The following is a reconciliation of our beginning and ending asset retirement obligation balances for 2017 and 2016 (in thousands): Year Ended December 31, 2017 2016 Balance, beginning of year $ 36,296 $ 37,230 Additions and revisions of estimates 3,859 — Accretion of discount 1,532 1,354 Liabilities settled (789 ) (370 ) Foreign currency translation adjustments and other (448 ) (1,918 ) Balance, end of year $ 40,450 $ 36,296
Future Non-Cancelable Minimum Lease Payments for Next Five Years and Thereafter	The following schedule details the future non-cancelable minimum lease payments for the next five years and thereafter (in thousands): Operating Leases 2018 $ 27,576 2019 $ 25,609 2020 $ 24,184 2021 $ 23,722 2022 $ 21,476 Thereafter $ 20,220
Letters of Credit and Guarantee Agreements	The following table summarizes our letters of credit and guarantee agreements (in thousands): 2018 2019 2020 2021 2022 Thereafter Letters of credit and other guarantees $ 40,347 $ 5,830 $ 1,672 $ 975 $ 1,074 $ 13,581

Stock-based Compensation Expe50

Stock-based Compensation Expense (Tables)	12 Months Ended
	Dec. 31, 2017
Share-based Compensation [Abstract]
Fixed-Price Stock Options	The following table summarizes information about the Company’s fixed-price stock options as of and for the year ended December 31, 2017 : Shares Weighted-Average Exercise Price Weighted-Average Remaining Contractual Term (Years) Aggregate Intrinsic Value (in thousands) Outstanding at December 31, 2016 1,542,244 $ 51.85 5.5 $ 52,798 Granted 82,204 92.93 Exercised (210,432 ) 39.15 Forfeited (12,298 ) 59.05 Outstanding at December 31, 2017 1,401,718 $ 56.10 5.1 $ 100,632 Exercisable at December 31, 2017 768,436 $ 50.35 3.3 $ 59,585
Weighted-Average Assumptions used to Estimate Fair Value of Each Option Granted	The fair value of each option granted during the years ended December 31, 2017 , 2016 and 2015 was estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted-average assumptions: Year Ended December 31, 2017 2016 2015 Dividend yield 1.56 % 1.84 % 1.80 % Volatility 32.70 % 33.08 % 32.92 % Average expected life (years) 6 6 6 Risk-free interest rate 2.51 % 1.96 % 2.17 % Fair value of options granted $ 27.99 $ 16.06 $ 16.04
Activity in Performance Unit Awards	The following table summarizes activity in performance unit awards as of and for the year ended December 31, 2017 : Shares Weighted-Average Grant Date Fair Value Per Share Nonvested, beginning of period 494,691 $ 66.42 Granted 82,396 116.43 Vested (131,374 ) 67.59 Forfeited (12,710 ) 67.36 Nonvested, end of period 433,003 75.55
Activity in Non-Performance Based Restricted Stock Awards	The following table summarizes activity in non-performance based restricted stock and restricted stock unit awards as of and for the year ended December 31, 2017 : Shares Weighted-Average Grant Date Fair Value Per Share Nonvested, beginning of period 180,656 $ 57.99 Granted 84,528 97.49 Vested (32,675 ) 63.45 Forfeited (9,171 ) 60.17 Nonvested, end of period 223,338 71.95

Accumulated Other Comprehensi51

Accumulated Other Comprehensive (Loss) Income (Tables)	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Components and Activity in Accumulated Other Comprehensive (Loss) Income, Net of Deferred Income Taxes	The components and activity in Accumulated other comprehensive (loss) income (net of deferred income taxes) consisted of the following during the years ended December 31, 2017 , 2016 and 2015 (in thousands): Foreign Currency Translation (a) Pension and Post-Retirement Benefits (b) Net Investment Hedge Interest Rate Swap (c) Total Accumulated other comprehensive (loss) income - balance at December 31, 2014 $ (52,835 ) $ — $ 11,384 $ (20,962 ) $ (62,413 ) Other comprehensive (loss) income before reclassifications (412,997 ) (774 ) 50,861 — (362,910 ) Amounts reclassified from accumulated other comprehensive loss 27 16 — 2,101 2,144 Other comprehensive (loss) income, net of tax (412,970 ) (758 ) 50,861 2,101 (360,766 ) Other comprehensive loss attributable to noncontrolling interests 1,891 — — — 1,891 Accumulated other comprehensive (loss) income - balance at December 31, 2015 $ (463,914 ) $ (758 ) $ 62,245 $ (18,861 ) $ (421,288 ) Other comprehensive (loss) income before reclassifications (102,246 ) — 26,133 — (76,113 ) Amounts reclassified from accumulated other comprehensive loss 81,421 834 — 2,116 84,371 Other comprehensive (loss) income, net of tax (20,825 ) 834 26,133 2,116 8,258 Other comprehensive loss attributable to noncontrolling interests 618 — — — 618 Accumulated other comprehensive (loss) income - balance at December 31, 2016 $ (484,121 ) $ 76 $ 88,378 $ (16,745 ) $ (412,412 ) Other comprehensive income (loss) before reclassifications 227,439 — (41,827 ) — 185,612 Amounts reclassified from accumulated other comprehensive loss — (97 ) — 2,116 2,019 Other comprehensive income (loss), net of tax 227,439 (97 ) (41,827 ) 2,116 187,631 Other comprehensive income attributable to noncontrolling interests (887 ) — — — (887 ) Accumulated other comprehensive (loss) income - balance at December 31, 2017 $ (257,569 ) $ (21 ) $ 46,551 $ (14,629 ) $ (225,668 ) (a) Amount reclassified from accumulated other comprehensive loss for the year ended December 31, 2016 is included in Income from discontinued operations (net of tax) for the year ended December 31, 2016 and resulted from the release of cumulative foreign currency translation adjustments into earnings upon the sale of our Chemetall Surface Treatment business which closed on December 14, 2016. See Note 3, “Divestitures,” for additional information. (b) The pre-tax portion of amounts reclassified from accumulated other comprehensive loss consists of amortization of prior service benefit, which is a component of pension and postretirement benefits (credit) cost. See Note 15, “Pension Plans and Other Postretirement Benefits,” for additional information. (c) The pre-tax portion of amounts reclassified from accumulated other comprehensive loss is included in interest expense.
Amount of Income Tax (Expense) Benefit Allocated to Component of Other Comprehensive (Loss) Income	The amount of income tax (expense) benefit allocated to each component of Other comprehensive income (loss) for the years ended December 31, 2017 , 2016 and 2015 is provided in the following tables (in thousands): Foreign Currency Translation Pension and Postretirement Benefits Net Investment Hedge Interest Rate Swap 2017 Other comprehensive income (loss), before tax $ 228,508 $ (96 ) $ (65,958 ) $ 3,336 Income tax (expense) benefit (1,069 ) (1 ) 24,131 (1,220 ) Other comprehensive income (loss), net of tax $ 227,439 $ (97 ) $ (41,827 ) $ 2,116 2016 Other comprehensive (loss) income, before tax $ (20,849 ) $ 839 $ 41,209 $ 3,336 Income tax benefit (expense) 24 (5 ) (15,076 ) (1,220 ) Other comprehensive (loss) income, net of tax $ (20,825 ) $ 834 $ 26,133 $ 2,116 2015 Other comprehensive (loss) income, before tax $ (451,762 ) $ (751 ) $ 80,746 $ 3,336 Income tax benefit (expense) 38,792 (7 ) (29,885 ) (1,235 ) Other comprehensive (loss) income, net of tax $ (412,970 ) $ (758 ) $ 50,861 $ 2,101

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Components of Income Tax Expense Benefit	Income from continuing operations before income taxes and equity in net income of unconsolidated investments, and current and deferred income tax expense (benefit) are composed of the following (in thousands): Year Ended December 31, 2017 2016 2015 Income from continuing operations before income taxes and equity in net income of unconsolidated investments: Domestic $ (8,293 ) $ 49,630 $ (15,861 ) Foreign 455,091 465,634 326,605 Total $ 446,798 $ 515,264 $ 310,744 Current income tax expense (benefit): Federal $ 394,747 $ 7,717 $ 76,778 State 323 1,407 (983 ) Foreign 78,688 63,957 58,710 Total $ 473,758 $ 73,081 $ 134,505 Deferred income tax (benefit) expense: Federal $ (58,640 ) $ 12,230 $ (127,212 ) State (2,288 ) (1,715 ) (1,267 ) Foreign 18,987 12,667 5,108 Total $ (41,941 ) $ 23,182 $ (123,371 ) Total income tax expense $ 431,817 $ 96,263 $ 11,134
Significant Differences Between United States Federal Statutory Rate and Effective Income Tax Rate	The reconciliation of the U.S. federal statutory rate to the effective income tax rate is as follows: % of Income Before Income Taxes 2017 2016 2015 Federal statutory rate 35.0 % 35.0 % 35.0 % State taxes, net of federal tax benefit (0.5 ) (0.1 ) 1.4 Change in valuation allowance (1.4 ) 3.7 5.7 Impact of foreign earnings, net (a) (13.5 ) (19.3 ) (22.0 ) Change in U.S. federal statutory rate (b) (14.0 ) — — Transition tax on deferred foreign earnings (b) 96.1 — — Subpart F income 2.0 0.2 7.8 Deemed repatriation of foreign income (c) — — 105.5 Undistributed earnings of foreign subsidiaries (a)(c) (2.2 ) 0.1 (114.8 ) Stock-based compensation (1.9 ) — — Nondeductible transaction costs — — 2.0 Depletion (1.4 ) (1.0 ) (1.8 ) Revaluation of unrecognized tax benefits/reserve requirements (d) (0.7 ) (0.4 ) (14.4 ) Domestic manufacturing tax deduction — (0.9 ) (0.5 ) Other items, net (0.9 ) 1.4 (0.3 ) Effective income tax rate 96.6 % 18.7 % 3.6 % (a) During 2017 , 2016 and 2015 , we received actual and deemed distributions of $42.5 million , $308.4 million and $1.4 billion , respectively, from various foreign subsidiaries and joint ventures, and realized income tax expense, net of foreign tax credits, of $9.1 million , $67.5 million and $350.2 million , respectively, related to the repatriation of these earnings, which impacted our effective tax rate. Our statutory rate is decreased by of our share of the income of JBC, a Free Zones company under the laws of the Hashemite Kingdom of Jordan. The applicable provisions of the Jordanian law, and applicable regulations thereunder, do not have a termination provision and the exemption is indefinite. As a Free Zones company, JBC is not subject to income taxes on the profits of products exported from Jordan, and currently, substantially all of the profits are from exports. This resulted in a rate benefit of 8.9% , 7.3% , and 8.2% for 2017 , 2016 , and 2015 , respectively. (b) We have made a reasonable estimate of the tax impact of the U.S. enacted tax law on our business and our consolidated financial statements and have recorded a provisional tax benefit of $62.3 million related to the remeasurement of our deferred tax assets and liabilities for the reduction in the Federal statutory tax rate from 35% to 21% . We have also recognized a provisional tax expense of $429.2 million for the one-time transition tax. (c) In prior years, we designated the undistributed earnings of substantially all of our foreign subsidiaries as indefinitely reinvested. In 2015, we were not indefinitely reinvested in a portion of earnings from legacy Rockwood entities that were part of the repatriation planning, for which a deferred tax liability of $387.0 million was established in the opening balance sheet. This liability reversed upon the completion of the repatriation with $356.2 million impacting earnings and $30.8 million from foreign exchange differences. The reversal of this liability offsets the tax amount of $327.9 million from legacy Rockwood entities included in the deemed repatriation of foreign income. (d) In 2015, the main impact is from the release of reserves on the close of a U.S. federal audit, and lapse of statute of limitations. These releases provided a net benefit of approximately $42.7 million .
Deferred Income Tax Assets and Liabilities Recorded on Consolidated Balance Sheets	Deferred income tax assets and liabilities recorded on the consolidated balance sheets as of December 31, 2017 and 2016 consist of the following (in thousands): December 31, 2017 2016 Deferred tax assets: Accrued employee benefits $ 21,463 $ 32,622 Accrued expenses — 10,065 Operating loss carryovers (a) 459,644 91,934 Pensions 64,799 96,635 Tax credit carryovers 11,634 1,029 Other 44,714 34,866 Gross deferred tax assets 602,254 267,151 Valuation allowance (a) (458,288 ) (69,900 ) Deferred tax assets 143,966 197,251 Deferred tax liabilities: Depreciation (334,162 ) (379,161 ) Intangibles (113,792 ) (99,969 ) Hedge of Net Investment of Foreign Subsidiary (17,028 ) (51,192 ) Other (24,265 ) (18,536 ) Deferred tax liabilities (489,247 ) (548,858 ) Net deferred tax liabilities $ (345,281 ) $ (351,607 ) Classification in the consolidated balance sheets: Noncurrent deferred tax assets $ 25,108 $ 61,132 Noncurrent deferred tax liabilities (370,389 ) (412,739 ) Net deferred tax liabilities $ (345,281 ) $ (351,607 ) (a) During 2017, the Company recorded a change in estimate related to a foreign entity that resulted in an increase to the deferred tax asset for net operating losses and an associated and equal valuation allowance of approximately $400.6 million .
Changes in Balance of Deferred Tax Asset Valuation Allowance	Changes in the balance of our deferred tax asset valuation allowance are as follows (in thousands): Year Ended December 31, 2017 2016 2015 Balance at January 1 $ (69,900 ) $ (84,137 ) $ (30,768 ) Additions (408,252 ) (20,568 ) (59,889 ) Deductions 19,864 34,805 6,520 Balance at December 31 $ (458,288 ) $ (69,900 ) $ (84,137 )
Reconciliation of Total Gross Liability Related to Uncertain Tax Positions	The following is a reconciliation of our total gross liability related to uncertain tax positions for 2017 , 2016 and 2015 (in thousands): Year Ended December 31, 2017 2016 2015 Balance at January 1 $ 25,384 $ 95,715 $ 24,969 Acquisition of Rockwood — — 124,758 Divestitures (a) — (55,881 ) — Additions for tax positions related to prior years — 548 4,329 Reductions for tax positions related to prior years (1,933 ) (1,253 ) (46,211 ) Additions for tax positions related to current year 1,132 1,271 202 Lapses in statutes of limitations/settlements (4,198 ) (12,591 ) (6,736 ) Foreign currency translation adjustment 1,053 (2,425 ) (5,596 ) Balance at December 31 $ 21,438 $ 25,384 $ 95,715 (a) Reclassified to Other noncurrent liabilities as a result of the indemnification of certain income tax liabilities associated with the Chemetall Surface Treatment entities sold. See Note 16, “Other Noncurrent Liabilities.”

Fair Value of Financial Instr53

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value of Long-Term Debt	The carrying value of our remaining long-term debt reported in the accompanying consolidated balance sheets approximates fair value as substantially all of such debt bears interest based on prevailing variable market rates currently available in the countries in which we have borrowings. December 31, 2017 2016 Recorded Amount Fair Value Recorded Amount Fair Value (In thousands) Long-term debt $ 1,845,309 $ 1,949,638 $ 2,381,370 $ 2,472,813

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	12 Months Ended
	Dec. 31, 2017
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis	The following tables set forth our financial assets and liabilities that were accounted for at fair value on a recurring basis as of December 31, 2017 and 2016 (in thousands): December 31, 2017 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Assets: Investments under executive deferred compensation plan (a) $ 25,494 $ 25,494 $ — $ — Private equity securities (b) $ 38 $ 38 $ — $ — Private equity securities measured at net asset value (b)(c) $ 5,121 $ — $ — $ — Pension assets (d) $ 563,460 $ 493,848 $ 69,612 $ — Pension assets measured at net asset value (d) $ 96,414 $ — $ — $ — Postretirement assets (d) $ 834 $ — $ 834 $ — Liabilities: Obligations under executive deferred compensation plan (a) $ 25,494 $ 25,494 $ — $ — Foreign currency forward contracts (e) $ 4,954 $ — $ 4,954 $ — December 31, 2016 Quoted Prices in Active Markets for Identical Items (Level 1) Quoted Prices in Active Markets for Similar Items (Level 2) Unobservable Inputs (Level 3) Assets: Investments under executive deferred compensation plan (a) $ 22,037 $ 22,037 $ — $ — Private equity securities (b) $ 35 $ 35 $ — $ — Private equity securities measured at net asset value (b)(c) $ 5,498 $ — $ — $ — Pension assets (d) $ 520,845 $ 460,247 $ 60,598 $ — Pension assets measured at net asset value (d) $ 86,112 $ — $ — $ — Postretirement assets (d) $ 2,232 $ — $ 2,232 $ — Liabilities: Obligations under executive deferred compensation plan (a) $ 22,037 $ 22,037 $ — $ — Foreign currency forward contracts (e) $ 182 $ — $ 182 $ — (a) We maintain an EDCP that was adopted in 2001 and subsequently amended. The purpose of the EDCP is to provide current tax planning opportunities as well as supplemental funds upon the retirement or death of certain of our employees. The EDCP is intended to aid in attracting and retaining employees of exceptional ability by providing them with these benefits. We also maintain a Benefit Protection Trust (the “Trust”) that was created to provide a source of funds to assist in meeting the obligations of the EDCP, subject to the claims of our creditors in the event of our insolvency. Assets of the Trust are consolidated in accordance with authoritative guidance. The assets of the Trust consist primarily of mutual fund investments (which are accounted for as trading securities and are marked-to-market on a monthly basis through the consolidated statements of income) and cash and cash equivalents. As such, these assets and obligations are classified within Level 1. (b) Primarily consists of private equity securities classified as available-for-sale and are reported in Investments in the consolidated balance sheets. The changes in fair value are reported in Other (expenses) income, net, in our consolidated statements of income. (c) Holdings in private equity securities are measured at fair value using the net asset value per share (or its equivalent) practical expedient and have not been categorized in the fair value hierarchy. The fair value amounts of $5.1 million and $5.5 million as of December 31, 2017 and 2016 , respectively, are included in this table to permit reconciliation to the marketable equity securities presented in Note 10, “Investments.” (d) See Note 15 “Pension Plans and Other Postretirement Benefits” for further information about fair value measurements of our pension and postretirement plan assets. (e) As a result of our global operating and financing activities, we are exposed to market risks from changes in foreign currency exchange rates, which may adversely affect our operating results and financial position. When deemed appropriate, we minimize our risks from foreign currency exchange rate fluctuations through the use of foreign currency forward contracts. Unless otherwise noted, these derivative financial instruments are not designated as hedging instruments under ASC 815, Derivatives and Hedging . The foreign currency forward contracts are valued using broker quotations or market transactions in either the listed or over-the-counter markets. As such, these derivative instruments are classified within Level 2.

Related Party Transactions (Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2017
Related Party Transactions [Abstract]
Schedule of Related Party Transactions	Our consolidated statements of income include sales to and purchases from unconsolidated affiliates in the ordinary course of business as follows (in thousands): Year Ended December 31, 2017 2016 2015 Sales to unconsolidated affiliates $ 29,514 $ 29,651 $ 24,180 Purchases from unconsolidated affiliates (a) $ 209,266 $ 130,287 $ 115,697 (a) Increase in 2017 primarily due to material purchases from our Windfield joint venture. Our consolidated balance sheets include accounts receivable due from and payable to unconsolidated affiliates in the ordinary course of business as follows (in thousands): December 31, 2017 2016 Receivable from related parties $ 2,406 $ 2,159 Payable to related parties $ 55,801 $ 38,466

Segment and Geographic Area I56

Segment and Geographic Area Information (Tables)	12 Months Ended
	Dec. 31, 2017
Segment Reporting [Abstract]
Summarized Financial Information by Reportable Segments	Year Ended December 31, 2017 2016 2015 (In thousands) Net sales: Lithium and Advanced Materials $ 1,308,153 $ 968,216 $ 834,590 Bromine Specialties 855,143 792,425 775,729 Refining Solutions 778,304 732,137 729,261 All Other 128,914 180,988 471,434 Corporate 1,462 3,437 15,415 Total net sales $ 3,071,976 $ 2,677,203 $ 2,826,429 Adjusted EBITDA: Lithium and Advanced Materials $ 518,530 $ 363,360 $ 312,867 Bromine Specialties 258,901 226,926 222,653 Refining Solutions 212,005 238,963 197,595 All Other 13,878 14,772 53,993 Corporate (117,834 ) (85,804 ) (31,108 ) Total adjusted EBITDA $ 885,480 $ 758,217 $ 756,000 See below for a reconciliation of adjusted EBITDA, the non-GAAP financial measure, to Net income attributable to Albemarle Corporation, the most directly comparable financial measure calculated and reported in accordance with U.S. GAAP (in thousands): Lithium and Advanced Materials Bromine Specialties Refining Solutions Reportable Segments Total All Other Corporate Consolidated Total 2017 Net income (loss) attributable to Albemarle Corporation $ 400,360 $ 218,839 $ 173,297 $ 792,496 $ 5,521 $ (743,167 ) $ 54,850 Depreciation and amortization 102,389 40,062 39,958 182,409 8,357 6,162 196,928 Utilization of inventory markup (a) 23,095 — — 23,095 — — 23,095 Restructuring and other, net (b) — — — — — 17,056 17,056 Gain on acquisition (c) (6,221 ) — — (6,221 ) — — (6,221 ) Acquisition and integration related costs (d) — — — — — 33,954 33,954 Interest and financing expenses (e) — — — — — 115,350 115,350 Income tax expense — — — — — 431,817 431,817 Non-operating pension and OPEB items — — — — — (16,125 ) (16,125 ) Multiemployer plan shortfall contributions (f) — — — — — 7,887 7,887 Note receivable reserve (g) — — — — — 28,730 28,730 Other (h) (1,093 ) — (1,250 ) (2,343 ) — 502 (1,841 ) Adjusted EBITDA $ 518,530 $ 258,901 $ 212,005 $ 989,436 $ 13,878 $ (117,834 ) $ 885,480 2016 Net income (loss) attributable to Albemarle Corporation $ 261,394 $ 187,364 $ 202,874 $ 651,632 $ 131,301 $ (139,258 ) $ 643,675 Depreciation and amortization 101,966 39,562 36,089 177,617 7,302 6,056 190,975 (Gain) loss on sales of businesses, net (i) — — — — (123,831 ) 1,533 (122,298 ) Acquisition and integration related costs (d) — — — — — 57,384 57,384 Interest and financing expenses — — — — — 65,181 65,181 Income tax expense — — — — — 96,263 96,263 Income from discontinued operations (net of tax) — — — — — (202,131 ) (202,131 ) Non-operating pension and OPEB items — — — — — 25,589 25,589 Other (j) — — — — — 3,579 3,579 Adjusted EBITDA $ 363,360 $ 226,926 $ 238,963 $ 829,249 $ 14,772 $ (85,804 ) $ 758,217 2015 Net income (loss) attributable to Albemarle Corporation $ 148,821 $ 186,474 $ 161,585 $ 496,880 $ 32,781 $ (194,755 ) $ 334,906 Depreciation and amortization 84,069 36,179 34,039 154,287 18,183 8,703 181,173 Utilization of inventory markup (k) 79,977 — — 79,977 3,029 — 83,006 Restructuring and other, net (l) — — — — — (6,804 ) (6,804 ) Acquisition and integration related costs (d) — — — — — 132,299 132,299 Interest and financing expenses — — — — — 81,650 81,650 Income tax expense — — — — — 11,134 11,134 Income from discontinued operations (net of tax) — — — — — (32,476 ) (32,476 ) Non-operating pension and OPEB items — — — — — (35,300 ) (35,300 ) Other (m) — — 1,971 1,971 — 4,441 6,412 Adjusted EBITDA $ 312,867 $ 222,653 $ 197,595 $ 733,115 $ 53,993 $ (31,108 ) $ 756,000 (a) In connection with the acquisition of Jiangli New Materials, the Company valued inventory purchased from Jiangli New Materials at fair value, which resulted in a markup of the underlying net book value of the inventory totaling approximately $23.1 million . The utilization of this inventory markup was included in Costs of goods sold during the year ended December 31, 2017, the estimated remaining selling period. (b) During 2017, we initiated action to reduce costs in each of our reportable segments at several locations, primarily at our Lithium sites in Germany. Based on the restructuring plans, we have recorded expenses of $2.9 million in Cost of goods sold, $8.4 million in Selling, general and administrative expenses, and $5.7 million in Research and development expenses for the year ended December 31, 2017, primarily related to expected severance payments. The unpaid balance is recorded in Accrued expenses at December 31, 2017, with the expectation that the majority of these plans will be completed by the end of 2018. (c) Gain recorded in Other (expenses) income, net related to the acquisition of the remaining 50% interest in Salmag. See Note 2, “Acquisitions,” for additional information. (d) See Note 2, “Acquisitions,” for additional information. (e) Included in Interest and financing expenses is a loss on early extinguishment of debt of $52.8 million . See Note 14, “Long-Term Debt,” for additional information. (f) Shortfall contributions for our multiemployer plan financial improvement plan. See Note 15, “Pension Plans and Other Postretirement Benefits,” for additional information. (g) Reserve recorded in Other (expenses) income, net against a note receivable on one of our European entities no longer deemed probable of collection. (h) Included amounts for the year ended December 31, 2017 recorded in: ▪ Cost of goods sold - $1.3 million reversal of deferred income related to an abandoned project at an unconsolidated investment. ▪ Selling, general and administrative expenses - $1.0 million related to a reversal of an accrual recorded as part of purchase accounting from a previous acquisition. ▪ Other (expenses) income, net - $3.2 million of asset retirement obligation charges related to the revision of an estimate at a site formerly owned by Albemarle, losses of $4.1 million related to final settlements of previously disposed businesses, the revision of tax indemnification expenses of $3.7 million primarily related to the filing of tax returns and a competent authority agreement for a previously disposed business and $1.0 million related to the settlement of a legal claim. This is partially offset by gains of $10.6 million and $1.1 million related to the reversal of liabilities recorded as part of purchase accounting from a previous acquisition and the previous disposal of a property, respectively. (i) See Note 3, “Divestitures,” for additional information. (j) Included amounts for the year ended December 31, 2016 recorded in: ▪ Research and development expenses - $1.4 million related to the write-off of fixed assets in China. ▪ Selling, general and administrative expenses - $0.9 million related to the net loss on the sales of properties. ▪ Other (expenses) income, net - $2.4 million related to environmental charges related to a site formerly owned by Albemarle, partially offset by a gain related to a previously disposed of site in China of $1.1 million . (k) In connection with the acquisition of Rockwood, the Company valued Rockwood’s existing inventory at fair value as of the Acquisition Closing Date, which resulted in a markup of the underlying net book value of the inventory totaling approximately $103.4 million . The inventory markup was expensed over the estimated remaining selling period. For the year ended December 31, 2015, $55.9 million was included in Cost of goods sold, and Equity in net income of unconsolidated investments was reduced by $27.1 million related to the utilization of the inventory markup. (l) Included in Restructuring and other, net, for the year ended December 31, 2015 is a gain of $6.8 million recognized upon the sale of land in Avonmouth, U.K., which was utilized by the phosphorus flame retardants business we exited in 2012. In 2012, charges in connection with our exit of the phosphorus flame retardants business were recorded in Restructuring and other, net, on our consolidated statements of income. (m) Refining Solutions included an impairment charge of approximately $2.0 million related to our unconsolidated investment in Fábrica Carioca de Catalisadores SA. Corporate included approximately $4.4 million of financing-related fees expensed in connection with the acquisition of Rockwood. As of December 31, 2017 2016 2015 (In thousands) Identifiable assets: Lithium and Advanced Materials $ 4,057,242 $ 3,809,883 $ 3,658,669 Bromine Specialties 745,007 724,218 699,929 Refining Solutions 1,016,519 913,923 937,445 Discontinued Operations — — 3,208,902 All Other 126,486 130,595 517,695 Corporate (a) 1,805,518 2,582,588 575,314 Total identifiable assets $ 7,750,772 $ 8,161,207 $ 9,597,954 Goodwill: Lithium and Advanced Materials $ 1,396,140 $ 1,348,261 $ 1,267,505 Bromine Specialties 20,319 20,319 20,319 Refining Solutions 187,310 164,866 172,728 All Other 6,586 6,586 — Total goodwill $ 1,610,355 $ 1,540,032 $ 1,460,552 (a) As of December 31, 2016, Corporate included the net proceeds received from the sale of the Chemetall Surface Treatment business completed on December 14, 2016, less the repayment of the term loans and commercial paper using those proceeds. See Note 3, “Divestitures,” and Note 14, “Long-Term Debt” for additional details about these transactions. Year Ended December 31, 2017 2016 2015 (In thousands) Depreciation and amortization: Lithium and Advanced Materials $ 102,389 $ 101,966 $ 84,069 Bromine Specialties 40,062 39,562 36,179 Refining Solutions 39,958 36,089 34,039 Discontinued Operations — 35,194 78,903 All Other 8,357 7,302 18,183 Corporate 6,162 6,056 8,703 Total depreciation and amortization $ 196,928 $ 226,169 $ 260,076 Capital expenditures: Lithium and Advanced Materials $ 207,410 $ 91,967 $ 104,344 Bromine Specialties 46,427 46,414 54,994 Refining Solutions 31,716 27,546 28,836 Discontinued Operations — 19,281 23,738 All Other 3,657 9,251 13,054 Corporate 28,493 2,195 2,683 Total capital expenditures $ 317,703 $ 196,654 $ 227,649
Net Sales by Geographic Area	Year Ended December 31, 2017 2016 2015 (In thousands) Net Sales: United States $ 840,589 $ 797,267 $ 911,519 Foreign (a) 2,231,387 1,879,936 1,914,910 Total $ 3,071,976 $ 2,677,203 $ 2,826,429 (a) In 2017 and 2016, net sales to China represented 15% and 13% , respectively, of total net sales. No net sales in any other foreign country exceed 10% of total net sales. Also, net sales are attributed to countries based upon shipments to final destination.
Long-Lived Assets by Geographic Area	As of December 31, 2017 2016 2015 (In thousands) Long-Lived Assets (a) : United States $ 833,002 $ 850,689 $ 800,214 Chile 1,069,859 922,878 916,965 Netherlands 171,980 145,917 155,128 Jordan 242,626 227,222 230,460 Australia 364,624 288,553 280,222 Brazil 47,255 46,380 39,299 Germany 115,305 117,027 137,890 China 50,532 31,564 4,773 France 40,852 39,470 39,344 Korea (b) 495 65,963 72,685 Other foreign countries 60,131 57,936 58,899 Total $ 2,996,661 $ 2,793,599 $ 2,735,879 (a) Long-lived assets are comprised of the Company’s Property, plant and equipment and Investments. (b) The reduction as of December 31, 2017, relates to the assets of the polyolefin catalysts and components portion of the PCS business that are included in Assets held for sale in the consolidated balance sheet.
Net Sales to External Customers by Product Category	Net sales to external customers by product category in each of the segments consists of the following: Year Ended December 31, 2017 2016 2015 (In thousands) Lithium and Advanced Materials: Lithium $ 1,018,885 $ 668,852 $ 508,844 Performance Catalyst Solutions 289,268 299,364 325,746 Total Lithium and Advanced Materials $ 1,308,153 $ 968,216 $ 834,590 Bromine Specialties $ 855,143 $ 792,425 $ 775,729 Refining Solutions $ 778,304 $ 732,137 $ 729,261

Quarterly Financial Summary (57

Quarterly Financial Summary (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Summary	First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share amounts) 2017 Net sales $ 722,063 $ 737,258 $ 754,866 $ 857,789 Gross profit $ 255,088 $ 272,094 $ 275,789 $ 307,009 Net income (loss) from continuing operations $ 62,657 $ 113,689 $ 130,193 $ (207,071 ) Net income attributable to noncontrolling interests (11,444 ) (10,356 ) (11,523 ) (11,295 ) Net income (loss) attributable to Albemarle Corporation $ 51,213 $ 103,333 $ 118,670 $ (218,366 ) Basic earnings (loss) per share $ 0.46 $ 0.93 $ 1.07 $ (1.98 ) Shares used to compute basic earnings per share 111,986 110,686 110,476 110,510 Diluted earnings (loss) per share $ 0.45 $ 0.92 $ 1.06 $ (1.95 ) Shares used to compute diluted earnings per share 113,289 112,105 111,975 112,152 First Quarter Second Quarter Third Quarter Fourth Quarter (In thousands, except per share amounts) 2016 Net sales $ 657,211 $ 669,327 $ 654,010 $ 696,655 Gross profit $ 242,534 $ 248,104 $ 238,972 $ 240,966 Gain on sales of businesses, net (a) $ (121,324 ) $ (974 ) $ — $ — Acquisition and integration related costs (b) $ 18,558 $ 19,030 $ 6,749 $ 13,047 Net income from continuing operations $ 218,236 $ 95,586 $ 114,512 $ 50,304 Income (loss) from discontinued operations (net of tax) (c) 17,312 (398,340 ) 23,185 559,974 Net income attributable to noncontrolling interests (7,362 ) (12,067 ) (9,477 ) (8,188 ) Net income (loss) attributable to Albemarle Corporation $ 228,186 $ (314,821 ) $ 128,220 $ 602,090 Basic earnings (loss) per share: Continuing operations $ 1.88 $ 0.74 $ 0.93 $ 0.37 Discontinued operations 0.15 (3.54 ) 0.21 4.98 $ 2.03 $ (2.80 ) $ 1.14 $ 5.35 Shares used to compute basic earnings per share 112,260 112,339 112,429 112,487 Diluted earnings (loss) per share: Continuing operations $ 1.87 $ 0.74 $ 0.93 $ 0.37 Discontinued operations 0.15 (3.52 ) 0.20 4.93 $ 2.02 $ (2.78 ) $ 1.13 $ 5.30 Shares used to compute diluted earnings per share 112,770 113,175 113,448 113,563 (a) Included in Gain on sales of businesses, net for the year ended December 31, 2016 is $11.5 million and $112.3 million related to the sales of the metal sulfides business and the minerals-based flame retardants and specialty chemicals business, respectively, both of which closed in the first quarter of 2016. In addition, Gain on sales of businesses, net for the year ended December 31, 2016 includes a loss of $1.5 million on the sale of our wafer reclaim business. See Note 3, “Divestitures,” for additional information. (b) See Note 2, “Acquisitions,” for additional information. (c) Included in Income (loss) from discontinued operations (net of tax) for the second quarter of 2016 is a nonrecurring, non-cash tax charge of $416.7 million related to the change in the Company’s assertion over book and tax basis differences for certain entities included in the sale of the Chemetall Surface Treatment business. In the fourth quarter of 2016, this non-cash tax charge was reversed as a result of the completion of the sale. In addition, the fourth quarter of 2016 includes an after-tax gain of $135.0 million as a result of the sale of the Chemetall Surface Treatment business.

Summary of Significant Accoun58

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]
Out-of-period adjustments	$ 5,100
Equity in net income of unconsolidated investments	84,487	$ 59,637	$ 27,978
Joint ventures	499,756	429,794
Foreign exchange transaction (losses) gains	$ (11,100)	$ 2,400	$ 51,800
Maximum remaining expiration period for foreign currency forward contracts	1 year
Excess tax benefits	$ 8,800
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
Definite-lived intangible assets useful life	5 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	60 years
Definite-lived intangible assets useful life	25 years
Planned Major Maintenance Activities
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	12 months
Saudi Organometallic Chemicals Company
Summary Of Significant Accounting Policies [Line Items]
Ownership percentage	50.00%
Equity in net income of unconsolidated investments	$ 3,800
Joint ventures	$ 4,500

Acquisitions (Details)

Acquisitions (Details) - USD ($) $ / shares in Units, $ in Thousands	Feb. 01, 2017	Dec. 31, 2016	Jan. 12, 2015	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Gain on acquisition								$ 6,221	$ 0	$ 0
Other acquisitions								44,367	126,747	48,845
Inventories		$ 450,263		$ 450,263				592,781	450,263
Acquisition and integration related costs				13,047	$ 6,749	$ 19,030	$ 18,558	0	57,384	132,299
Goodwill		1,540,032		1,540,032				1,610,355	1,540,032	1,460,552
Purchase of noncontrolling interest								0	0	4,784
Sales de Magnesio Ltda.
Business Acquisition [Line Items]
Percentage of equity interests acquired	50.00%
Total purchase price	$ 8,300
Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Business Acquisition [Line Items]
Other acquisitions		$ 145,000
Accounts receivable								600
Property, plant and equipment								24,100
Other intangibles								46,300
Accounts payable								2,800
Deferred tax liabilities								6,300
Fair value of net working capital								6,200
Inventories								37,100
Inventory markup								23,100
Acquired finite-lived intangible assets, weighted average useful life		17 years
Rockwood Holdings, Inc.
Business Acquisition [Line Items]
Total purchase price			$ 5,700,000
Inventory markup			103,400
Acquisition and integration related costs									52,100	123,900
Goodwill			$ 2,800,000
Utilization of inventory markup									103,400
Pro forma Net sales									3,684,665
Pro forma Net income									$ 527,997
Pro forma Net income from continuing operations per share: Basic (in dollars per share)									$ 4.75
Pro forma Net income from continuing operations per share: Diluted (in dollars per share)									$ 4.73
Other significant projects
Business Acquisition [Line Items]
Acquisition and integration related costs									$ 5,300	8,400
Shanghai Chemetall
Business Acquisition [Line Items]
Acquisition of remaining interest in Shanghai Chemetall									57,600
Chemal GmbH
Business Acquisition [Line Items]
Other acquisitions									2,200
Nanjing Chemetall Surface Treatment Technologies
Business Acquisition [Line Items]
Purchase of noncontrolling interest									4,800
Acquisition and integration related costs | Rockwood Holdings, Inc.
Business Acquisition [Line Items]
Acquisition and integration related costs									137,700
Patents and technology | Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		20 years
Customer lists and relationships | Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		13 years
Other | Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Business Acquisition [Line Items]
Acquired finite-lived intangible assets, weighted average useful life		20 years
Other (expenses) income, net | Sales de Magnesio Ltda.
Business Acquisition [Line Items]
Gain on acquisition								6,200
Cost of sales
Business Acquisition [Line Items]
Acquisition and integration related costs								14,300
Cost of sales | Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Business Acquisition [Line Items]
Utilization of inventory markup								23,100
Cost of sales | Rockwood Holdings, Inc.
Business Acquisition [Line Items]
Utilization of inventory markup										55,900
Selling, general and administrative expenses
Business Acquisition [Line Items]
Acquisition and integration related costs								19,600
Reportable Segments | Lithium and Advanced Materials
Business Acquisition [Line Items]
Goodwill		$ 1,348,261		$ 1,348,261				1,396,140	$ 1,348,261	$ 1,267,505
Reportable Segments | Lithium and Advanced Materials | Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Business Acquisition [Line Items]
Goodwill								$ 83,100

Divestitures - Discontinued Ope

Divestitures - Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income from discontinued operations (net of tax)	$ 559,974	$ 23,185	$ (398,340)	$ 17,312	$ 0	$ 202,131	$ 32,476
Chemetall Surface Treatment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net sales						813,285	824,906
Cost of goods sold						416,934	488,267
Operating expenses, net						268,402	239,316
Interest and financing expenses						38,227	51,072
Other income, net						(2,485)	(4,214)
Gain on sale of discontinued operations						(387,980)	0
Income before income taxes						480,187	50,465
Income tax expense						278,056	17,989
Income from discontinued operations (net of tax)						202,131	32,476
Depreciation and amortization						35,194	78,903
Capital expenditures						$ 19,281	$ 23,738

Divestitures - Additional Infor

Divestitures - Additional Information (Details) - USD ($) $ in Thousands	Dec. 14, 2016	Feb. 01, 2016	Jan. 04, 2016	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestitures, net										$ 6,857	$ 3,325,571	$ 8,883
Amounts reclassified from accumulated other comprehensive income										(2,019)	(84,371)	(2,144)
Actuarial (losses) gains				$ 11,400		$ (26,700)
Gain (loss) on sales of businesses, net						0	$ 0	$ 974	$ 121,324	0	122,298	0
Chemetall Surface Treatment
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestitures, net	$ 3,100,000
Gain on sale of business, before income taxes											(387,980)	0
Gain on sale of business, net of tax						$ 135,000
Working capital settlement					$ 6,900							7,600
Actuarial (losses) gains											(8,500)	$ 8,900
Tax expense on gain on sale of business											253,000
Gain (loss) on sales of businesses, net										$ 257,000
Metal Sulfides Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestitures, net			$ 137,000
Gain (loss) on sales of businesses, net											11,500
Mineral Flame Retardants and Specialty Chemicals Businesses
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestitures, net		$ 187,000
Gain (loss) on sales of businesses, net											$ 112,300
Magnifin Magnesiaprodukte GmbH & Co. KG
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage		50.00%		0.00%		0.00%				0.00%	0.00%	50.00%
Corporate | Wafer Reclaim
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sales of businesses, net											$ (1,500)
Foreign Currency Translation
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Amounts reclassified from accumulated other comprehensive income										$ 0	$ (81,421)	$ (27)

Divestitures Divestitures - Oth

Divestitures Divestitures - Other Assets and Liabilities Held for Sale (Details) - USD ($) $ in Thousands	Dec. 14, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestitures, net		$ 6,857	$ 3,325,571	$ 8,883
Current assets		39,152	0
Net property, plant and equipment		215,900
Current liabilities		1,938	$ 0
Noncurrent liabilities		600
Assets held for sale, excluding discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestitures, net	$ 416,000
Current assets		39,152
Net property, plant and equipment		121,759
Goodwill		14,422
Other intangibles, net of amortization		3,632
Assets held for sale		178,965
Current liabilities		1,938
Noncurrent liabilities		614
Liabilities held for sale		$ 2,552

Supplemental Cash Flow Inform63

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]
Income taxes (net of refunds of $17,522, $9,270 and $7,333 in 2017, 2016 and 2015, respectively)	$ 320,222	$ 143,404	$ 162,408
Income taxes, refunds	17,522	9,270	7,333
Interest (net of capitalization)	61,243	96,948	153,271
Capital expenditures included in Accounts payable	$ 89,188	$ 33,622	$ 45,826

Supplemental Cash Flow Inform64

Supplemental Cash Flow Information Footnote (Details) - USD ($) $ in Thousands	3 Months Ended					12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flow Supplemental Disclosures [Line Items]
Gain on sales of businesses, net		$ 0	$ 0	$ 974	$ 121,324	$ 0	$ 122,298	$ 0
Foreign earnings repatriated						42,500	308,400	1,400,000
Transition tax on foreign earnings						394,900
Foreign currency exchange rate losses (gains)						11,100	$ 40,800	(70,700)
Rockwood Holdings, Inc.
Cash Flow Supplemental Disclosures [Line Items]
Foreign earnings repatriated								111,000
Chemetall Surface Treatment
Cash Flow Supplemental Disclosures [Line Items]
Gain on sales of businesses, net						$ 257,000
Working capital settlement	$ 6,900							$ 7,600

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income from continuing operations	$ (207,071)	$ 130,193	$ 113,689	$ 62,657	$ 50,304	$ 114,512	$ 95,586	$ 218,236	$ 99,468	$ 478,638	$ 327,588
Net income from continuing operations attributable to noncontrolling interests									(44,618)	(37,094)	(25,158)
Net income from continuing operations attributable to Albemarle Corporation									$ 54,850	$ 441,544	$ 302,430
Weighted-average common shares for basic earnings per share (in shares)	110,510	110,476	110,686	111,986	112,487	112,429	112,339	112,260	110,914	112,379	111,182
Basic earnings per share from continuing operations (in dollars per share)	$ (1.98)	$ 1.07	$ 0.93	$ 0.46	$ 0.37	$ 0.93	$ 0.74	$ 1.88	$ 0.49	$ 3.93	$ 2.72
Incremental shares under stock compensation plans									1,466	860	374
Weighted-average common shares for diluted earnings per share (in shares)	112,152	111,975	112,105	113,289	113,563	113,448	113,175	112,770	112,380	113,239	111,556
Diluted earnings per share from continuing operations (in dollars per share)	$ (1.95)	$ 1.06	$ 0.92	$ 0.45	$ 0.37	$ 0.93	$ 0.74	$ 1.87	$ 0.49	$ 3.90	$ 2.71

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Details) - USD ($) $ in Thousands	Jun. 16, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Nov. 30, 2016
Earnings Per Share Disclosure [Line Items]
Preferred stock, shares authorized (in shares)			15,000,000
Payment for repurchase of common stock			$ 250,000	$ 0	$ 0
Shares available for repurchase (in shares)			12,658,917
Preferred shares issued			0
Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Payment for repurchase of common stock		$ 250,000
Maximum
Earnings Per Share Disclosure [Line Items]
Number of shares authorized to be repurchased (in shares)						15,000,000
Restricted Stock
Earnings Per Share Disclosure [Line Items]
Number of shares containing nonforfeitable rights to dividends (in shares)			8,050
Initial Delivery | Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Repurchase of common stock shares (in shares)		1,948,178
Final Settlement | Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Repurchase of common stock shares (in shares)	392,905
Total Delivery | Accelerated Share Repurchase Agreement
Earnings Per Share Disclosure [Line Items]
Repurchase of common stock shares (in shares)			2,341,083
Common Stock
Earnings Per Share Disclosure [Line Items]
Common stock repurchased				0	0

Other Accounts Receivable (Deta

Other Accounts Receivable (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Receivables [Abstract]
Value added tax/consumption tax	$ 23,158	$ 15,324
Other	14,779	26,661
Total	$ 37,937	$ 41,985

Inventories (Details)

Inventories (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 404,239	$ 289,102
Raw materials and work in process	132,891	109,706
Stores, supplies and other	55,651	51,455
Total inventories	$ 592,781	$ 450,263

Inventories - Additional Inform

Inventories - Additional Information (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Inventories classified as assets held for sale	$ 24.7
Percentage of LIFO inventory	17.00%	19.00%
Inventories stated on LIFO basis	$ 99.6	$ 87.5
Excess of replacement costs over stated LIFO value	33.1	33.8
Lithium
Inventory [Line Items]
Work in process related to Lithium	$ 59.6	$ 47.1

Other Current Assets (Details)

Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Other Assets [Abstract]
Income tax receivables	$ 47,130	$ 15,085
Prepaid expenses	86,348	42,240
Other	2,586	1,254
Total	$ 136,064	$ 58,579

Property, Plant and Equipment71

Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Abstract]
Land	$ 118,428	$ 120,842
Land improvements	63,328	59,387
Buildings and improvements	245,482	256,603
Machinery and equipment	2,627,667	2,501,481
Long-term mineral rights and production equipment costs	675,832	654,006
Construction in progress	393,598	318,203
Total	$ 4,124,335	$ 3,910,522

Property, Plant and Equipment72

Property, Plant and Equipment (Footnote) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Property, Plant and Equipment [Line Items]
Property, plant and equipment classified as assets held for sale	$ 215.9
Minimum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum | Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Minimum | Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	10 years
Minimum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum | Long term mineral rights and production equipment costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Minimum | Short-lived production equipment components, office and building equipment and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	2 years
Minimum | Production process equipment (intermediate components)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	8 years
Minimum | Production process equipment (major unit components)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	20 years
Minimum | Production process equipment (infrastructure and other)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Maximum
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	60 years
Maximum | Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	30 years
Maximum | Building and improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	45 years
Maximum | Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	45 years
Maximum | Long term mineral rights and production equipment costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	60 years
Maximum | Short-lived production equipment components, office and building equipment and other equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	7 years
Maximum | Production process equipment (intermediate components)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	19 years
Maximum | Production process equipment (major unit components)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	29 years
Maximum | Production process equipment (infrastructure and other)
Property, Plant and Equipment [Line Items]
Property, plant and equipment, useful life	45 years

Property Plant and Equipment -

Property Plant and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 169.5	$ 178.8	$ 162.2
Interest capitalized on significant capital projects	$ 7.4	6.8	11.2
Discontinued operations
Property, Plant and Equipment [Line Items]
Depreciation		$ 8.9	$ 18.5

Investments Investment Balances

Investments Investment Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Investments [Abstract]
Joint ventures	$ 499,756	$ 429,794
Nonmarketable securities	3,655	169
Marketable equity securities	30,653	27,570
Total	$ 534,064	$ 457,533

Investments Ownership Positions

Investments Ownership Positions in Significant Unconsolidated (Details)	Dec. 31, 2017	Dec. 31, 2016	Feb. 01, 2016	Dec. 31, 2015
Windfield Holdings
Schedule of Equity Method Investments [Line Items]
Ownership percentage	49.00%	49.00%		49.00%
Nippon Aluminum Alkyls
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%	50.00%		50.00%
Magnifin Magnesiaprodukte GmbH & Co. KG
Schedule of Equity Method Investments [Line Items]
Ownership percentage	0.00%	0.00%	50.00%	50.00%
Nippon Ketjen Company Limited
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%	50.00%		50.00%
Eurecat S.A.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%	50.00%		50.00%
Fabrica Carioca de Catalisadores S.A.
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%	50.00%		50.00%

Investments Summary of Assets,

Investments Summary of Assets, Liabilities and Results of Operations for Significant Unconsolidated Joint Ventures (Details) - Significant Unconsolidated Joint Ventures - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Current assets	$ 503,043	$ 383,203
Noncurrent assets	1,041,519	913,643
Total assets	1,544,562	1,296,846
Current liabilities	133,670	138,474
Noncurrent liabilities	405,662	319,801
Total liabilities	539,332	458,275
Net sales	687,561	590,980	$ 560,376
Gross profit	353,577	267,241	253,569
Income before income taxes	267,805	189,016	157,501
Net income	$ 184,777	$ 126,872	$ 111,491

Investments Additional Informat

Investments Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule of Investments [Line Items]
Equity in net income of unconsolidated investments (net of tax)		$ 84,487	$ 59,637	$ 27,978
Dividends received from unconsolidated investments		39,386	43,759	59,912
Investments in unconsolidated joint ventures exceeded the amount of underlying equity in net assets		13,800	(6,800)
Excess amount paid for joint ventures remaining to be amortized		400	600
Return of capital from unconsolidated investment		0	0	98,000
Termination of Tianqi Lithium Corporation option agreement	$ 13,100	0
Marketable equity securities		30,653	27,570
Joint ventures		499,756	429,794
Significant Unconsolidated Joint Venture
Schedule of Investments [Line Items]
Investment in significant unconsolidated joint ventures		479,100	404,600
Equity in net income of unconsolidated investments (net of tax)		86,800	56,800	25,400
Undistributed earnings from equity method investees		127,500	99,400
Dividends received from unconsolidated investments		$ 38,100	$ 42,100	$ 58,100
Windfield Holdings
Schedule of Investments [Line Items]
Ownership percentage		49.00%	49.00%	49.00%
Return of capital from unconsolidated investment				$ 98,000
Rockwood Lithium GmbH
Schedule of Investments [Line Items]
Ownership Percentage	100.00%
Saudi Organometallic Chemicals Company
Schedule of Investments [Line Items]
Equity in net income of unconsolidated investments (net of tax)		$ 3,800
Ownership percentage		50.00%
Joint ventures		$ 4,500
Benefit Protection Trust
Schedule of Investments [Line Items]
Marketable equity securities		$ 25,500	$ 22,000
Windfield Holdings
Schedule of Investments [Line Items]
Ownership percentage		49.00%
Carrying value of unconsolidated investment		$ 355,200	288,600
Other Variable Interest Entities Excluding Windfield Holdings
Schedule of Investments [Line Items]
Carrying value of unconsolidated investment		$ 8,700	8,800
Jordan Bromine Company Limited
Schedule of Investments [Line Items]
Ownership percentage		50.00%
Rockwood Holdings, Inc.
Schedule of Investments [Line Items]
Utilization of inventory markup			$ 103,400
Equity in net income of unconsolidated investments | Rockwood Holdings, Inc.
Schedule of Investments [Line Items]
Utilization of inventory markup				$ 27,100
Minimum | Rockwood Lithium GmbH
Schedule of Investments [Line Items]
Ownership Percentage		20.00%
Maximum | Rockwood Lithium GmbH
Schedule of Investments [Line Items]
Ownership Percentage		30.00%

Other Assets (Details)

Other Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Other Assets, Noncurrent [Abstract]
Deferred income taxes	$ 25,108	$ 61,132
Assets related to unrecognized tax benefits	14,601	15,076
Other	34,455	66,112
Total	74,164	$ 142,320
Note receivable reserve	$ 28,700

Goodwill and Other Intangible79

Goodwill and Other Intangibles Changes in Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 1,540,032	$ 1,460,552
Reclass from/to assets held for sale	(14,422)	6,586
Foreign currency translation adjustments	110,896	(38,955)
Goodwill, Ending Balance	1,610,355	1,540,032
All Other
Goodwill [Roll Forward]
Goodwill, Beginning Balance	6,586	0
Reclass from/to assets held for sale	0	6,586
Foreign currency translation adjustments	0	0
Goodwill, Ending Balance	6,586	6,586
Reportable Segments | Lithium and Advanced Materials
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,348,261	1,267,505
Reclass from/to assets held for sale	(14,422)	0
Foreign currency translation adjustments	88,452	(31,093)
Goodwill, Ending Balance	1,396,140	1,348,261
Reportable Segments | Bromine Specialties
Goodwill [Roll Forward]
Goodwill, Beginning Balance	20,319	20,319
Reclass from/to assets held for sale	0	0
Foreign currency translation adjustments	0	0
Goodwill, Ending Balance	20,319	20,319
Reportable Segments | Refining Solutions
Goodwill [Roll Forward]
Goodwill, Beginning Balance	164,866	172,728
Reclass from/to assets held for sale	0	0
Foreign currency translation adjustments	22,444	(7,862)
Goodwill, Ending Balance	187,310	164,866
Rockwood Holdings, Inc.
Goodwill [Roll Forward]
Acquisitions		(1,706)
Rockwood Holdings, Inc. | All Other
Goodwill [Roll Forward]
Acquisitions		0
Rockwood Holdings, Inc. | Reportable Segments | Lithium and Advanced Materials
Goodwill [Roll Forward]
Acquisitions		(1,706)
Rockwood Holdings, Inc. | Reportable Segments | Bromine Specialties
Goodwill [Roll Forward]
Acquisitions		0
Rockwood Holdings, Inc. | Reportable Segments | Refining Solutions
Goodwill [Roll Forward]
Acquisitions		0
Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Goodwill [Roll Forward]
Acquisitions	(26,151)	113,555
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | All Other
Goodwill [Roll Forward]
Acquisitions	0	0
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Reportable Segments | Lithium and Advanced Materials
Goodwill [Roll Forward]
Acquisitions	(26,151)	113,555
Goodwill, Ending Balance	83,100
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Reportable Segments | Bromine Specialties
Goodwill [Roll Forward]
Acquisitions	0	0
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Reportable Segments | Refining Solutions
Goodwill [Roll Forward]
Acquisitions	$ 0	$ 0

Goodwill and Other Intangible80

Goodwill and Other Intangibles Changes in Goodwill by Operating Segment (Footnote) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016USD ($)
Chemetall Surface Treatment
Goodwill [Line Items]
Acquisitions	$ 3.2

Goodwill and Other Intangible81

Goodwill and Other Intangibles Other Intangibles (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	$ 461,685	$ 473,571
Reclass from assets held for sale		1,454
Foreign currency translation adjustments and other	39,828	(13,340)
Acquisitions	59,882
Reclass to assets held for sale	(4,228)
Gross Asset Value, Ending Balance	557,167	461,685	$ 473,571
Accumulated Amortization, Beginning Balance	(107,121)	(89,703)
Amortization	(25,079)	(19,039)	(16,900)
Reclass from assets held for sale		(1,322)
Foreign currency translation adjustments and other	(4,060)	2,943
Reclass to assets held for sale	596
Accumulated Amortization, Ending Balance	(135,664)	(107,121)	(89,703)
Net Book Value	421,503	354,564
Customer lists and relationships
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	387,893	398,725
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	32,194	(10,832)
Acquisitions	19,225
Reclass to assets held for sale	0
Gross Asset Value, Ending Balance	439,312	387,893	398,725
Accumulated Amortization, Beginning Balance	(49,165)	(32,656)
Amortization	(21,288)	(18,034)
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	(4,251)	1,525
Reclass to assets held for sale	0
Accumulated Amortization, Ending Balance	(74,704)	(49,165)	(32,656)
Net Book Value	364,608	338,728
Trademarks and Trade Names
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	16,514	16,923
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	1,038	(409)
Acquisitions	1,429
Reclass to assets held for sale	0
Gross Asset Value, Ending Balance	18,981	16,514	16,923
Accumulated Amortization, Beginning Balance	(7,952)	(8,086)
Amortization	0	0
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	(343)	134
Reclass to assets held for sale	0
Accumulated Amortization, Ending Balance	(8,295)	(7,952)	(8,086)
Net Book Value	10,686	8,562
Patents and technology
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	38,434	40,144
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	2,803	(1,710)
Acquisitions	20,381
Reclass to assets held for sale	0
Gross Asset Value, Ending Balance	61,618	38,434	40,144
Accumulated Amortization, Beginning Balance	(31,683)	(32,008)
Amortization	(1,412)	(574)
Reclass from assets held for sale		0
Foreign currency translation adjustments and other	(2,108)	899
Reclass to assets held for sale	0
Accumulated Amortization, Ending Balance	(35,203)	(31,683)	(32,008)
Net Book Value	26,415	6,751
Other
Finite-lived Intangible Assets [Roll Forward]
Gross Asset Value, Beginning Balance	18,844	17,779
Reclass from assets held for sale		1,454
Foreign currency translation adjustments and other	3,793	(389)
Acquisitions	18,847
Reclass to assets held for sale	(4,228)
Gross Asset Value, Ending Balance	37,256	18,844	17,779
Accumulated Amortization, Beginning Balance	(18,321)	(16,953)
Amortization	(2,379)	(431)
Reclass from assets held for sale		(1,322)
Foreign currency translation adjustments and other	2,642	385
Reclass to assets held for sale	596
Accumulated Amortization, Ending Balance	(17,462)	(18,321)	$ (16,953)
Net Book Value	$ 19,794	$ 523

Goodwill and Other Intangible82

Goodwill and Other Intangibles - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Intangible Assets [Line Items]
Amortization of other intangible assets	$ 25,079	$ 19,039	$ 16,900
Minimum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	5 years
Maximum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	25 years
Customer lists and relationships
Other Intangible Assets [Line Items]
Amortization of other intangible assets	$ 21,288	18,034
Customer lists and relationships | Minimum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	13 years
Customer lists and relationships | Maximum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	25 years
Trademarks and Trade Names
Other Intangible Assets [Line Items]
Amortization of other intangible assets	$ 0	0
Patents and technology
Other Intangible Assets [Line Items]
Amortization of other intangible assets	$ 1,412	574
Patents and technology | Minimum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	17 years
Patents and technology | Maximum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	20 years
Other
Other Intangible Assets [Line Items]
Amortization of other intangible assets	$ 2,379	431
Other | Minimum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	5 years
Other | Maximum
Other Intangible Assets [Line Items]
Finite-lived intangible assets, useful life	25 years
Amortized using the pattern of economic benefit method
Other Intangible Assets [Line Items]
Amortization of other intangible assets	$ 17,700	15,900
Discontinued operations
Other Intangible Assets [Line Items]
Amortization of other intangible assets		$ 26,300	$ 60,400

Goodwill and Other Intangible83

Goodwill and Other Intangibles Total Estimated Amortization Expense of Other Intangibles for Next Five Fiscal Years (Details) $ in Thousands	Dec. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 27,166
2,019	27,461
2,020	25,035
2,021	24,756
2,022	$ 24,162

Accrued Expenses (Details)

Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Employee benefits, payroll and related taxes	$ 93,393	$ 92,478
Obligations in connection with acquisitions	0	47,082
Other	174,943	182,605
Total	$ 268,336	$ 322,165

Accrued Expenses Accrued Expens

Accrued Expenses Accrued Expenses Footnote (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Concentration Risk [Line Items]
Accrued expenses classified as liabilities held for sale	$ 0.8
Total Current Liabilities
Concentration Risk [Line Items]
Benchmark for individual components of accrued expenses, percentage	5.00%

Long-Term Debt Schedule of Debt

Long-Term Debt Schedule of Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Total long-term debt	$ 1,837,372	$ 2,369,262
Current portion of long-term debt	422,012	247,544
Long-term debt	1,415,360	2,121,718
Senior Notes | 1.875% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	463,575	719,617
Senior Notes | 3.00% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	0	248,714
Senior Notes | 4.15% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	421,628	421,141
Senior Notes | 4.50% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	174,325	347,620
Senior Notes | 5.45% Senior Notes
Debt Instrument [Line Items]
Total long-term debt	345,841	345,687
Commercial Paper
Debt Instrument [Line Items]
Total long-term debt	421,321	247,503
Variable-rate foreign bank loans
Debt Instrument [Line Items]
Total long-term debt	5,298	38,939
Other long-term debt
Debt Instrument [Line Items]
Total long-term debt	$ 5,384	$ 41

Long-Term Debt Interest Rates (

Long-Term Debt Interest Rates (Details) $ in Thousands, € in Millions	Feb. 01, 2015USD ($)	Jan. 31, 2015USD ($)	Feb. 28, 2017USD ($)	Mar. 31, 2017USD ($)	Mar. 31, 2017EUR (€)	Mar. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 18, 2014	Dec. 08, 2014	Nov. 24, 2014	Dec. 10, 2010	Jan. 20, 2005
Debt Instrument [Line Items]
Repayments of long-term debt							$ 778,209	$ 1,252,302	$ 2,582,901
364 Day Facility
Debt Instrument [Line Items]
Repayments of long-term debt							300,000
Five Year Facility
Debt Instrument [Line Items]
Repayments of long-term debt							950,000
1.875% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs							$ 3,971	$ 7,823
Debt instrument, interest rate				1.875%	1.875%		1.875%	1.875%		1.875%	1.875%
3.00% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs							$ 0	$ 1,286
Debt instrument, interest rate				3.00%	3.00%		3.00%	3.00%				3.00%
4.15% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs							$ 3,372	$ 3,859
Debt instrument, interest rate							4.15%	4.15%				4.15%
4.50% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs							$ 891	$ 2,380
Debt instrument, interest rate				4.50%	4.50%		4.50%	4.50%					4.50%
5.10% Senior Notes
Debt Instrument [Line Items]
Debt instrument, interest rate														5.10%
Repayments of long-term debt	$ 325,000
5.45% Senior Notes
Debt Instrument [Line Items]
Unamortized discount and debt issuance costs							$ 4,159	$ 4,313
Debt instrument, interest rate							5.45%	5.45%				5.45%
Short-term Debt | Term Loan
Debt Instrument [Line Items]
Repayments of long-term debt						$ 1,000,000
Weighted-average interest rate						1.67%
Senior Unsecured Cash Bridge Facility | Bridge Loan
Debt Instrument [Line Items]
Repayments of long-term debt		$ 800,000
Domestic Financial Institution Agreement
Debt Instrument [Line Items]
Long-term line of credit							$ 0	$ 0
Foreign Credit Line U S Dollar Euro Denominated Borrowings
Debt Instrument [Line Items]
Long-term line of credit							0	0
Other Foreign Credit Lines
Debt Instrument [Line Items]
Long-term line of credit							$ 0	$ 0
Senior Notes | 1.875% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt | €					€ 307
Senior Notes | 3.00% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt			$ 250,000
Senior Notes | 4.50% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt				$ 174,700

Long-Term Debt - Additional Inf

Long-Term Debt - Additional Information (Details) $ in Thousands, € in Millions	Oct. 15, 2015USD ($)	Feb. 01, 2015USD ($)	Oct. 15, 2014USD ($)	Feb. 07, 2014USD ($)	Dec. 31, 2016USD ($)	Jan. 31, 2015USD ($)	Feb. 28, 2017USD ($)	Mar. 31, 2017USD ($)	Mar. 31, 2017EUR (€)	Mar. 31, 2015USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Jan. 12, 2015USD ($)	Dec. 22, 2014USD ($)	Dec. 18, 2014	Dec. 08, 2014EUR (€)	Dec. 02, 2014USD ($)	Nov. 24, 2014USD ($)	Aug. 15, 2014USD ($)	Jan. 22, 2014USD ($)payment	May 29, 2013USD ($)	Dec. 10, 2010USD ($)	Jan. 20, 2005USD ($)
Debt Instrument [Line Items]
Aggregate annual maturities of long-term debt, 2018											$ 422,000
Aggregate annual maturities of long-term debt, 2019											200
Aggregate annual maturities of long-term debt, 2020											180,500
Aggregate annual maturities of long-term debt, 2021											467,500
Aggregate annual maturities of long-term debt, 2022											0
Aggregate annual maturities of long-term debt, thereafter											779,500
Repayments of long-term debt											778,209	$ 1,252,302	$ 2,582,901
Repayments of debt premium								$ 45,200
Loss on early extinguishment of debt											52,801	1,921	5,353
Payments of debt premium											46,959	0	43,340
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months											3,300
Proceeds from borrowings of other long-term debt											27,000	0	2,250,000
Debt financing costs paid											0	$ 0	4,544
Revolving credit facility, remaining borrowings available											$ 578,700
1.875% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt | €																		€ 700
Debt instrument, interest rate					1.875%			1.875%	1.875%		1.875%	1.875%					1.875%	1.875%
Interest rate of debt, effective percentage																		2.10%
Other comprehensive (loss) income before reclassifications, before tax											$ (41,800)	$ 26,100	50,900
3.00% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt																				$ 250,000
Debt instrument, interest rate					3.00%			3.00%	3.00%		3.00%	3.00%								3.00%
Interest rate of debt, effective percentage																				3.18%
4.15% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt																				$ 425,000
Debt instrument, interest rate					4.15%						4.15%	4.15%								4.15%
Interest rate of debt, effective percentage																				5.06%
Number of semi annual coupon payments | payment																						20
4.50% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt																								$ 350,000
Debt instrument, interest rate					4.50%			4.50%	4.50%		4.50%	4.50%												4.50%
Interest rate of debt, effective percentage																								4.70%
5.10% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt																									$ 325,000
Debt instrument, interest rate																									5.10%
Interest rate of debt, effective percentage																									5.19%
Repayments of long-term debt		$ 325,000
5.45% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt																				$ 350,000
Debt instrument, interest rate					5.45%						5.45%	5.45%								5.45%
Interest rate of debt, effective percentage																				5.50%
4.625% Senior Notes
Debt Instrument [Line Items]
Principal amount of debt															$ 1,250,000
Loss on early extinguishment of debt													$ 5,400
Debt instrument, redemption price, percentage	103.469%
Payments of debt premium	$ 43,300
Commercial Paper
Debt Instrument [Line Items]
Repayments of long-term debt					$ 153,000
Commercial paper notes											$ 421,300
Weighted-average interest rate											1.80%
Debt instrument weighted average maturity period											36 days
Line of Credit
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity											$ 266,000
Borrowings outstanding under credit facility					$ 38,900						$ 5,300	$ 38,900
Average interest rate on borrowings					0.94%						1.26%	0.94%	0.74%
Maximum | Commercial Paper
Debt Instrument [Line Items]
Commercial paper notes																							$ 750,000
Debt instrument, maturity term											397 days
Revolving Credit Facility
Debt Instrument [Line Items]
Interest rate margin											1.10%
Revolving credit facility, maximum borrowing capacity				$ 1,000,000												$ 1,000,000
Debt covenant ratio, maximum debt to EBITDA				3.50
Debt covenant				20.00%
Revolving Credit Facility | Minimum
Debt Instrument [Line Items]
Interest rate margin				1.00%
Revolving Credit Facility | Maximum
Debt Instrument [Line Items]
Interest rate margin				1.70%
Short-term Debt | Term Loan
Debt Instrument [Line Items]
Repayments of long-term debt										$ 1,000,000
Weighted-average interest rate										1.67%
Additional borrowing capacity amount																					$ 1,000,000
Proceeds from borrowings of other long-term debt						$ 1,000,000
Senior Unsecured Cash Bridge Facility | Bridge Loan
Debt Instrument [Line Items]
Repayments of long-term debt						800,000
Additional borrowing capacity amount																			$ 1,150,000
Proceeds from borrowings of other long-term debt						$ 800,000
Bridge Loan
Debt Instrument [Line Items]
Bridge loan fees														$ 19,000
Interest Rate Swap | JP Morgan
Debt Instrument [Line Items]
Derivative, notional amount																						$ 325,000
Payment for settlement of interest rate swap			$ 33,400
Senior Notes | 1.875% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt | €									€ 307
Senior Notes | 3.00% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt							$ 250,000
Senior Notes | 4.50% Senior Notes
Debt Instrument [Line Items]
Repayments of long-term debt								$ 174,700
London Interbank Offered Rate (LIBOR) | September 2015 Term Loan Agreement
Debt Instrument [Line Items]
Interest rate margin											1.375%
Other (expenses) income | Bridge Loan
Debt Instrument [Line Items]
Bridge loan fees expensed in period													$ 2,300

Pension Plans and Other Postr89

Pension Plans and Other Postretirement Benefits - Additional Information (Details) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2005
Defined Benefit Plan Disclosure [Line Items]
Accumulated benefit obligation for defined benefit pension plans		$ 949,000	$ 901,400
Post retirement medical benefit available to U.S. employees, change of age group, current range					under age 50
Age group for capping of retiree medical premium					age 50 and above
Percentage of defined benefit plan assets in U.S. and U.K.		98.00%
Change in percentage of broad asset class targets		10.00%
Pension and postretirement contributions		$ 13,341	$ 20,068	$ 21,613
Assumed rate of increase in the pre-65 per capita cost of covered health care benefits for U.S. retirees		0.00%
Assumed rate of increase in the post-65 per capita cost of covered health care benefits for U.S. retirees		0.00%
Transfers between fair value Level 1 and Level 2		$ 0
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to benefit plans in 2018		$ 13,000
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets		7.00%	7.00%	7.00%
Expected premium contribution		$ 3,000
Projected benefit obligation recognized		56,647	$ 56,141	$ 56,499
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Expected contributions to benefit plans in 2018		1,300
Costs (credits) related to supplemental executive retirement plan		2,600	1,600	$ (2,100)
Projected benefit obligation recognized		$ 24,800	$ 23,500
Subsequent Event | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	7.00%
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets		6.89%	6.89%	6.88%
Projected benefit obligation recognized		$ 685,963	$ 665,688	$ 682,839
Defined contribution plan, employer matching contribution percentage		5.00%
U.S. Plans | 2004 Defined Contribution Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions		$ 10,300	15,100	12,800
U.S. Plans | Employee Savings Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions		$ 11,300	$ 12,700	$ 11,700
U.S. Plans | Subsequent Event | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	6.89%
Foreign Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets		6.16%	6.66%	5.76%
Projected benefit obligation recognized		$ 275,006	$ 246,280	$ 245,747
Foreign Plans | Employee Savings Plan | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, employer contributions		$ 9,900	$ 9,500	$ 7,200
Foreign Plans | Subsequent Event | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Weighted-average expected rate of return on plan assets	5.52%

Pension Plans and Other Postr90

Pension Plans and Other Postretirement Benefits Reconciliation of Benefit Obligations, Plan Assets and Funded Status of Plans, as well as Summary of Significant Assumptions for Benefit Plans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans
Change in plan assets:
Fair value of plan assets, beginning balance	$ 606,957
Fair value of plan assets, Ending Balance	659,874	$ 606,957
Other Postretirement Benefits
Change in benefit obligations:
Benefit obligation, beginning balance	56,141	56,499
Service cost	121	115	$ 137
Interest cost	2,340	2,483	2,573
Actuarial loss	2,008	1,529
Benefits paid	(3,963)	(4,485)
Benefit obligation, ending balance	56,647	56,141	56,499
Change in plan assets:
Fair value of plan assets, beginning balance	2,232	3,292
Actual return on plan assets	104	442
Employer contributions	2,461	2,983
Benefits paid	(3,963)	(4,485)
Fair value of plan assets, Ending Balance	834	2,232	3,292
Funded status	(55,813)	(53,909)
Current liabilities (accrued expenses)	(3,810)	(3,371)
Noncurrent liabilities (pension benefits)	(52,003)	(50,538)
Net pension liability	(55,813)	(53,909)
Prior service benefit	48	143
Net amount recognized	$ 48	$ 143
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	3.99%	4.35%
Rate of compensation increase	3.50%	3.50%
U.S. Plans | Pension Plans
Change in benefit obligations:
Benefit obligation, beginning balance	$ 665,688	$ 682,839
Service cost	985	1,028	1,233
Interest cost	28,614	30,514	30,235
Actuarial loss	30,539	7,357
Benefits paid	(39,863)	(56,050)
Divestitures	0	0
Employee contributions	0	0
Foreign exchange loss (gain)	0	0
Settlements/curtailments	0	0
Other	0	0
Benefit obligation, ending balance	685,963	665,688	682,839
Change in plan assets:
Fair value of plan assets, beginning balance	538,082	555,084
Actual return on plan assets	80,613	37,725
Employer contributions	1,564	1,323
Benefits paid	(39,863)	(56,050)
Employee contributions	0	0
Foreign exchange gain (loss)	0	0
Settlements/curtailments	0	0
Other	0	0
Fair value of plan assets, Ending Balance	580,396	538,082	555,084
Funded status	(105,567)	(127,606)
Current liabilities (accrued expenses)	(1,267)	(1,100)
Noncurrent liabilities (pension benefits)	(104,300)	(126,506)
Net pension liability	(105,567)	(127,606)
Prior service benefit	(60)	(136)
Net amount recognized	$ (60)	$ (136)
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	4.03%	4.43%
Rate of compensation increase	0.00%	0.00%
Foreign Plans | Pension Plans
Change in benefit obligations:
Benefit obligation, beginning balance	$ 246,280	$ 245,747
Service cost	2,547	3,133	3,909
Interest cost	5,128	6,570	6,405
Actuarial loss	2,783	28,083
Benefits paid	(9,524)	(9,793)
Divestitures	0	(6,372)
Employee contributions	215	245
Foreign exchange loss (gain)	30,711	(21,724)
Settlements/curtailments	(3,065)	(427)
Other	(69)	818
Benefit obligation, ending balance	275,006	246,280	245,747
Change in plan assets:
Fair value of plan assets, beginning balance	68,875	64,911
Actual return on plan assets	6,260	12,534
Employer contributions	9,316	10,911
Benefits paid	(9,524)	(9,793)
Employee contributions	215	245
Foreign exchange gain (loss)	7,470	(10,492)
Settlements/curtailments	(3,065)	0
Other	(69)	559
Fair value of plan assets, Ending Balance	79,478	68,875	$ 64,911
Funded status	(195,528)	(177,405)
Current liabilities (accrued expenses)	(5,217)	(5,216)
Noncurrent liabilities (pension benefits)	(190,311)	(172,189)
Net pension liability	(195,528)	(177,405)
Prior service benefit	(269)	(322)
Net amount recognized	$ (269)	$ (322)
Weighted-average assumptions used to determine benefit obligations at December 31:
Discount rate	1.94%	2.00%
Rate of compensation increase	3.18%	3.18%

Pension Plans and Other Postr91

Pension Plans and Other Postretirement Benefits Components of Pension and Postretirement Benefits Expense (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Actuarial (gain) loss	$ (11,400)	$ 26,700
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 121	$ 115	$ 137
Interest cost			2,340	2,483	2,573
Expected return on assets			(110)	(187)	(263)
Actuarial (gain) loss			2,014	1,275	(5,707)
Amortization of prior service benefit			(95)	(95)	(95)
Total net pension benefits cost (credit)			$ 4,270	$ 3,591	$ (3,355)
Weighted-average assumption percentages:
Discount rate			4.35%	4.59%	4.15%
Expected return on plan assets			7.00%	7.00%	7.00%
Rate of compensation increase			3.50%	3.50%	3.50%
Net pension or postretirement benefits credit					$ 2,600
Pension Plans
Weighted-average assumption percentages:
Net pension or postretirement benefits credit				$ 10,800	6,200
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 985	1,028	1,233
Interest cost			28,614	30,514	30,235
Expected return on assets			(36,243)	(36,445)	(40,495)
Actuarial (gain) loss			(13,910)	5,988	2,665
Amortization of prior service benefit			75	75	75
Total net pension benefits cost (credit)			$ (20,479)	$ 1,160	$ (6,287)
Weighted-average assumption percentages:
Discount rate			4.43%	4.67%	4.19%
Expected return on plan assets			6.89%	6.89%	6.88%
Rate of compensation increase			0.00%	0.00%	0.00%
Foreign Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Service cost			$ 2,547	$ 3,133	$ 3,909
Interest cost			5,128	6,570	6,405
Expected return on assets			(4,441)	(4,027)	(3,670)
Actuarial (gain) loss			483	19,418	(27,043)
Amortization of prior service benefit			56	859	43
Total net pension benefits cost (credit)			$ 3,773	$ 25,953	$ (20,356)
Weighted-average assumption percentages:
Discount rate			2.00%	2.76%	2.22%
Expected return on plan assets			6.16%	6.66%	5.76%
Rate of compensation increase			3.18%	3.16%	3.15%

Pension Plans and Other Postr92

Pension Plans and Other Postretirement Benefits Estimated Amounts to Be Amortized from Accumulated Other Comprehensive Income into Net Periodic Benefit Costs (Details) $ in Thousands	Dec. 31, 2017USD ($)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	$ (48)
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	60
Foreign Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service benefit	$ 40

Pension Plans and Other Postr93

Pension Plans and Other Postretirement Benefits Financial Assets Accounted for at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 659,874	$ 606,957
Pension Plans | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	163,160	146,683
Pension Plans | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	130,935	116,649
Pension Plans | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	269,365	255,401
Pension Plans | Absolute Return Measured At Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	96,414	86,112
Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2,112
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	834	2,232	$ 3,292
Other Postretirement Benefits | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	834	2,232
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	493,848	460,247
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	160,976	143,987
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	101,366	83,839
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	231,506	230,309
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Absolute Return Measured At Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		2,112
Quoted Prices in Active Markets for Identical Items (Level 1) | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets for Identical Items (Level 1) | Other Postretirement Benefits | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	69,612	60,598
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,184	2,696
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29,569	32,810
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	37,859	25,092
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Absolute Return Measured At Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Quoted Prices in Active Markets for Similar Items (Level 2) | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	834	2,232
Quoted Prices in Active Markets for Similar Items (Level 2) | Other Postretirement Benefits | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	834	2,232
Unobservable Inputs (Level 3) | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Pension Plans | Domestic Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Pension Plans | International Equity
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Pension Plans | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Pension Plans | Absolute Return Measured At Net Asset Value
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Pension Plans | Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Unobservable Inputs (Level 3) | Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Other Postretirement Benefits | Fixed income
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0

Pension Plans and Other Postr94

Pension Plans and Other Postretirement Benefits Defined Benefit Plan Asset Target Allocation (Details) - Pension Plans	Dec. 31, 2017
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target allocations percentage of assets	43.00%
Fixed income
Defined Benefit Plan Disclosure [Line Items]
Target allocations percentage of assets	44.00%
Absolute return
Defined Benefit Plan Disclosure [Line Items]
Target allocations percentage of assets	13.00%

Pension Plans and Other Postr95

Pension Plans and Other Postretirement Benefits Current Forecast of Benefit Payments which Reflect Expected Future Service (Details) $ in Millions	Dec. 31, 2017USD ($)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
2,018	$ 4.6
2,019	4.4
2,020	4.2
2,021	3.9
2,022	3.9
2023-2027	18.2
U.S. Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
2,018	41.2
2,019	43.2
2,020	43.9
2,021	44.3
2,022	44.6
2023-2027	224.2
Foreign Plans | Pension Plans
Defined Benefit Plan Disclosure [Line Items]
2,018	13.9
2,019	9.1
2,020	10.2
2,021	10.8
2,022	10
2023-2027	$ 59

Pension Plans and Other Postr96

Pension Plans and Other Postretirement Benefits Multiemployer Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Multiemployer Plans [Line Items]
Multiemployer plan minimum level of funding for highest funding zone status	80.00%
Multiemployer plan, period contributions	$ 1.5	$ 1.7	$ 1.8
Minimum
Multiemployer Plans [Line Items]
Contributions to multiemployer plan, percentage of total contributions to plan	5.00%
Chemetall Surface Treatment
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions		$ 1.3	$ 1.3
Financial Improvement Plan | Selling, general and administrative expenses
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 3.3
Financial Improvement Plan | Other (expenses) income, net
Multiemployer Plans [Line Items]
Multiemployer plan, period contributions	$ 4.6

Other Noncurrent Liabilities (D

Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Liabilities, Noncurrent [Abstract]
Transition tax on foreign earnings	$ 394,878	$ 0
Liabilities related to uncertain tax positions	24,369	27,919
Executive deferred compensation plan obligation	25,494	22,037
Environmental liabilities	37,518	32,595	$ 29,993
Asset retirement obligations	40,450	36,296
Tax indemnification liability	42,707	38,255
Other	33,758	37,708
Total	$ 599,174	$ 194,810

Other Noncurrent Liabilities Fo

Other Noncurrent Liabilities Footnote (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017USD ($)
Concentration Risk [Line Items]
Other noncurrent liabilities classified as liabilities held for sale	$ 0.6
Total liabilities
Concentration Risk [Line Items]
Benchmark for individual components of noncurrent liabilities, percentage	5.00%

Commitments and Contingencies A

Commitments and Contingencies Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance, beginning of year	$ 34,919	$ 31,436	$ 9,235
Expenditures	(1,818)	(2,667)	(4,039)
Divestitures	0	0	(1,826)
Accretion of discount	896	793	902
Additions and revisions of estimates	3,344	4,004	150
Reclass to liabilities held for sale	0	0	(5,253)
Foreign currency translation adjustments and other	2,467	1,353	(2,359)
Balance, end of year	34,919	31,436	9,235	$ 39,808	$ 34,919	$ 31,436
Less amounts reported in Accrued expenses				2,290	2,324	1,443
Amounts reported in Other noncurrent liabilities				$ 37,518	$ 32,595	$ 29,993
Rockwood Holdings, Inc.
Accrual for Environmental Loss Contingencies [Roll Forward]
Acquisition of Rockwood	$ 0	$ 0	$ 34,626

Commitments and Contingencie100

Commitments and Contingencies Activity in Recorded Asset Retirement Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance, beginning of year	$ 36,296	$ 37,230
Additions and revisions of estimates	3,859	0
Accretion of discount	1,532	1,354
Liabilities settled	(789)	(370)
Foreign currency translation adjustments and other	(448)	(1,918)
Balance, end of year	$ 36,296	$ 37,230	$ 40,450

Commitments and Contingencies F

Commitments and Contingencies Future Non-Cancelable Minimum Lease Payments for Next Five Years and Thereafter (Details) $ in Thousands	Dec. 31, 2017USD ($)
Minimum Operating Lease Payments
2,018	$ 27,576
2,019	25,609
2,020	24,184
2,021	23,722
2,022	21,476
Thereafter	$ 20,220

Commitments and Contingencies L

Commitments and Contingencies Letters of Credit and Guarantee Agreements (Details) $ in Thousands	Dec. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
2,018	$ 40,347
2,019	5,830
2,020	1,672
2,021	975
2,022	1,074
Thereafter	$ 13,581

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Commitments And Contingencies Disclosure [Line Items]
Environmental remediation liabilities- discounted	$ 28.1	$ 22.8
Accrual for environmental loss contingencies- weighted-average discount rate	3.60%	3.50%
Environmental remediation liabilities- undiscounted	$ 68.2	$ 61.1
Potential revision on future environmental remediation costs before tax	18
Rental expense	$ 31.2	31.4	$ 34.8
Discontinued operations
Commitments And Contingencies Disclosure [Line Items]
Rental expense		$ 11.8	$ 10.2

Stock-based Compensation Exp104

Stock-based Compensation Expense Fixed-Price Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shares
Outstanding Shares,Beginning Balance (in shares)	1,542,244
Granted (in shares)	82,204	141,661	313,803
Exercised (in shares)	(210,432)
Forfeited (in shares)	(12,298)
Outstanding Shares, Ending Balance (in shares)	1,401,718	1,542,244
Exercisable, Ending Balance (in shares)	768,436
Weighted-Average Exercise Price
Outstanding Weighted-Average Exercise Price, Beginning Balance (in dollars per share)	$ 51.85
Granted (in dollars per share)	92.93
Exercised (in dollars per share)	39.15
Forfeited (in dollars per share)	59.05
Outstanding Weighted-Average Exercise (in dollars per share)Price, Ending Balance	56.10	$ 51.85
Exercisable Weighted-Average Exercise Price, Ending Balance (in dollars per share)	$ 50.35
Weighted-Average Remaining Contractual Term (Years)
Weighted-Averaged Remaining Contractual Term, Beginning Balance	5 years 1 month	5 years 6 months
Weighted-Averaged Remaining Contractual Term, Ending Balance	5 years 1 month	5 years 6 months
Exercisable Weighted-Average Remaining Contractual Term, Ending Balance	3 years 3 months
Aggregate Intrinsic Value
Outstanding Aggregate Intrinsic Value, Beginning Balance	$ 52,798
Outstanding Aggregate Intrinsic Value, Ending Balance	100,632	$ 52,798
Exercisable Aggregate Intrinsic Value, Ending Balance	$ 59,585

Stock-based Compensation Exp105

Stock-based Compensation Expense Weighted-Average Assumptions used to Estimate Fair Value of Each Option Granted (Details) - $ / shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation [Abstract]
Dividend yield	1.56%	1.84%	1.80%
Volatility	32.70%	33.08%	32.92%
Average expected life (years)	6 years	6 years	6 years
Risk-free interest rate	2.51%	1.96%	2.17%
Fair value of options granted (in dollars per share)	$ 27.99	$ 16.06	$ 16.04

Stock-based Compensation Exp106

Stock-based Compensation Expense Activity in Performance Unit Awards (Details) - Performance Unit Awards	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Shares
Nonvested, beginning of period (in shares) | shares	494,691
Granted (in shares) | shares	82,396
Vested (in shares) | shares	(131,374)
Forfeited (in shares) | shares	(12,710)
Nonvested, end of period (in shares) | shares	433,003
Weighted Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share) | $ / shares	$ 66.42
Granted (in dollars per share) | $ / shares	116.43
Vested (in dollars per share) | $ / shares	67.59
Forfeited (in dollars per share) | $ / shares	67.36
Nonvested, end of period (in dollars per share) | $ / shares	$ 75.55

Stock-based Compensation Exp107

Stock-based Compensation Expense Activity in Non-Performance Based Restricted Stock Awards (Details) - Restricted Stock And Restricted Stock Units	12 Months Ended
	Dec. 31, 2017$ / sharesshares
Shares
Nonvested, beginning of period (in shares) | shares	180,656
Granted (in shares) | shares	84,528
Vested (in shares) | shares	(32,675)
Forfeited (in shares) | shares	(9,171)
Nonvested, end of period (in shares) | shares	223,338
Weighted Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share) | $ / shares	$ 57.99
Granted (in dollars per share) | $ / shares	97.49
Vested (in dollars per share) | $ / shares	63.45
Forfeited (in dollars per share) | $ / shares	60.17
Nonvested, end of period (in dollars per share) | $ / shares	$ 71.95

Stock-based Compensation Exp108

Stock-based Compensation Expense - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Apr. 20, 2010	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 07, 2013
Share Based Compensation [Line Items]
Stock options granted during the period (in shares)		82,204	141,661	313,803
Common stock authorized for non-employee directors (in shares)		150,000,000	150,000,000
Stock-based compensation		$ 19,404,000	$ 17,031,000	$ 15,188,000
Tax benefits recognized related to stock based compensation		7,000,000	6,200,000	5,600,000
Proceeds from stock option exercised		$ 8,238,000	9,401,000	517,000
Minimum
Share Based Compensation [Line Items]
Share-based awards vesting period		1 year
Maximum
Share Based Compensation [Line Items]
Share-based awards vesting period		5 years
Albemarle Corporation 2008 Incentive Plan
Share Based Compensation [Line Items]
Increase in number of shares available for issuance under incentive plan (in shares)	4,470,000
Reduced incentive plan awards number of shares for each share (in shares)	1.6
Shares available for grant (in shares)		1,873,159
Albemarle Corporation 2008 Incentive Plan | Maximum
Share Based Compensation [Line Items]
Number of shares available for issuance under incentive plan (in shares)	7,470,000
Non Employee Directors, Plan
Share Based Compensation [Line Items]
Common stock authorized for non-employee directors (in shares)					500,000
Shares available for grant (in shares)		408,591
Non Employee Directors, Plan | Maximum
Share Based Compensation [Line Items]
Fair market value of shares issued per director per year		$ 150,000
Stock Options
Share Based Compensation [Line Items]
Share-based awards vesting period		3 years
Stock options, term		10 years
Intrinsic value of stock options exercised		$ 15,600,000	7,900,000	500,000
Compensation cost not yet recognized for nonvested share		$ 5,000,000
Remaining weighted average period for recognition of compensation cost years		1 year 6 months 24 days
Proceeds from stock option exercised		$ 8,200,000
Tax benefit from stock option exercised		5,700,000
Restricted Stock And Restricted Stock Units
Share Based Compensation [Line Items]
Compensation cost not yet recognized for nonvested share		$ 9,700,000
Remaining weighted average period for recognition of compensation cost years		2 years 1 month 24 days
Weighted average grant date fair value		$ 8,200,000	8,800,000	3,500,000
Weighted average fair value of awards vested in period		$ 3,100,000	3,200,000	2,200,000
Restricted Stock And Restricted Stock Units | Minimum
Share Based Compensation [Line Items]
Share-based awards vesting period		1 year
Restricted Stock And Restricted Stock Units | Maximum
Share Based Compensation [Line Items]
Share-based awards vesting period		5 years
Performance Unit Awards
Share Based Compensation [Line Items]
Compensation cost not yet recognized for nonvested share		$ 11,500,000
Remaining weighted average period for recognition of compensation cost years		1 year 1 month 24 days
Weighted average grant date fair value		$ 9,600,000	10,900,000	11,900,000
Weighted average fair value of awards vested in period		$ 11,900,000	4,600,000	$ 2,500,000
Number of common stock share for each performance unit (in shares)		1
Performance Unit Awards | Minimum
Share Based Compensation [Line Items]
Performance unit award payout percentage		0.00%
Specific performance criteria period		1 year
Performance Unit Awards | Maximum
Share Based Compensation [Line Items]
Performance unit award payout percentage		200.00%
Specific performance criteria period		3 years
Two Year Measurement Period
Share Based Compensation [Line Items]
Percentage of award distributed		50.00%
One Year Vesting Period Thereafter
Share Based Compensation [Line Items]
Percentage of award distributed		50.00%
Chemetall Surface Treatment
Share Based Compensation [Line Items]
Stock-based compensation			$ 5,800,000
Accrued Liabilities | Chemetall Surface Treatment
Share Based Compensation [Line Items]
Stock-based compensation		$ 2,300,000
Other Noncurrent Liabilities | Chemetall Surface Treatment
Share Based Compensation [Line Items]
Stock-based compensation		$ 3,400,000

Accumulated Other Comprehens109

Accumulated Other Comprehensive (Loss) Income Components and Activity in Accumulated Other Comprehensive (Loss) Income Net of Deferred Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	$ 3,942,604	$ 3,401,313	$ 1,488,635
Other comprehensive income (loss) before reclassifications	185,612	(76,113)	(362,910)
Amounts reclassified from accumulated other comprehensive loss	2,019	84,371	2,144
Total other comprehensive income (loss), net of tax	187,631	8,258	(360,766)
Other comprehensive income attributable to noncontrolling interests	(887)	618	1,891
Ending balance	3,817,696	3,942,604	3,401,313
Foreign Currency Translation
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(484,121)	(463,914)	(52,835)
Other comprehensive income (loss) before reclassifications	227,439	(102,246)	(412,997)
Amounts reclassified from accumulated other comprehensive loss	0	81,421	27
Total other comprehensive income (loss), net of tax	227,439	(20,825)	(412,970)
Other comprehensive income attributable to noncontrolling interests	(887)	618	1,891
Ending balance	(257,569)	(484,121)	(463,914)
Pension and Postretirement Benefits
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	76	(758)	0
Other comprehensive income (loss) before reclassifications	0	0	(774)
Amounts reclassified from accumulated other comprehensive loss	(97)	834	16
Total other comprehensive income (loss), net of tax	(97)	834	(758)
Other comprehensive income attributable to noncontrolling interests	0	0	0
Ending balance	(21)	76	(758)
Net Investment Hedge
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	88,378	62,245	11,384
Other comprehensive income (loss) before reclassifications	(41,827)	26,133	50,861
Amounts reclassified from accumulated other comprehensive loss	0	0	0
Total other comprehensive income (loss), net of tax	(41,827)	26,133	50,861
Other comprehensive income attributable to noncontrolling interests	0	0	0
Ending balance	46,551	88,378	62,245
Interest Rate Swap
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(16,745)	(18,861)	(20,962)
Other comprehensive income (loss) before reclassifications	0	0	0
Amounts reclassified from accumulated other comprehensive loss	2,116	2,116	2,101
Total other comprehensive income (loss), net of tax	2,116	2,116	2,101
Other comprehensive income attributable to noncontrolling interests	0	0	0
Ending balance	(14,629)	(16,745)	(18,861)
Accumulated Other Comprehensive (Loss) Income
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning balance	(412,412)	(421,288)	(62,413)
Total other comprehensive income (loss), net of tax	186,744	8,876	(358,875)
Ending balance	$ (225,668)	$ (412,412)	$ (421,288)

Accumulated Other Comprehens110

Accumulated Other Comprehensive (Loss) Income Amount of Income Tax (Expense) Benefit Allocated to Component of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Equity [Abstract]
Foreign currency translation, Other comprehensive income (loss), before tax	$ 228,508	$ (20,849)	$ (451,762)
Foreign currency translation, Income tax (expense) benefit	(1,069)	24	38,792
Foreign currency translation, Other comprehensive income (loss), net of tax	227,439	(20,825)	(412,970)
Pension and other postretirement benefits, Other comprehensive (loss) income, before tax	(96)	839	(751)
Pension and other postretirement benefits, Income tax expense	(1)	(5)	(7)
Pension and other postretirement benefits, Other comprehensive (loss) income, net of tax	(97)	834	(758)
Net investment hedge, Other comprehensive (loss) income, before tax	(65,958)	41,209	80,746
Net investment hedge, Income tax benefit (expense)	24,131	(15,076)	(29,885)
Net investment hedge, Other comprehensive (loss) income, net of tax	(41,827)	26,133	50,861
Interest rate swap, Other comprehensive income, before tax	3,336	3,336	3,336
Interest rate swap, Income tax expense	(1,220)	(1,220)	(1,235)
Interest rate swap, Other comprehensive income, net of tax	$ 2,116	$ 2,116	$ 2,101

Income Taxes Components of Inco

Income Taxes Components of Income Tax Expense Benefit (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income from continuing operations before income taxes and equity in net income of unconsolidated investments:
Domestic	$ (8,293)	$ 49,630	$ (15,861)
Foreign	455,091	465,634	326,605
Income from continuing operations before income taxes and equity in net income of unconsolidated investments	446,798	515,264	310,744
Current income tax expense (benefit):
Federal	394,747	7,717	76,778
State	323	1,407	(983)
Foreign	78,688	63,957	58,710
Total	473,758	73,081	134,505
Deferred income tax (benefit) expense:
Federal	(58,640)	12,230	(127,212)
State	(2,288)	(1,715)	(1,267)
Foreign	18,987	12,667	5,108
Total	(41,941)	23,182	(123,371)
Total income tax expense	$ 431,817	$ 96,263	$ 11,134

Income Taxes Significant Differ

Income Taxes Significant Differences Between U.S. Federal Statutory Rate and Effective Income Tax Rate (Detail)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Federal statutory rate	35.00%	35.00%	35.00%
State taxes, net of federal tax benefit	(0.50%)	(0.10%)	1.40%
Change in valuation allowance	(1.40%)	3.70%	5.70%
Impact of foreign earnings, net	(13.50%)	(19.30%)	(22.00%)
Change in U.S. federal statutory rate	(14.00%)	0.00%	0.00%
Transition tax on deferred foreign earnings	96.10%	0.00%	0.00%
Subpart F income	2.00%	0.20%	7.80%
Deemed repatriation of foreign income	0.00%	0.00%	105.50%
Undistributed earnings of foreign subsidiaries	(2.20%)	0.10%	(114.80%)
Stock-based compensation	(1.90%)	0.00%	0.00%
Nondeductible transaction costs	0.00%	0.00%	2.00%
Depletion	(1.40%)	(1.00%)	(1.80%)
Revaluation of unrecognized tax benefits/reserve requirements	(0.70%)	(0.40%)	(14.40%)
Domestic manufacturing tax deduction	(0.00%)	(0.90%)	(0.50%)
Other items, net	(0.90%)	1.40%	(0.30%)
Effective income tax rate	96.60%	18.70%	3.60%

Income Taxes Significant Dif113

Income Taxes Significant Differences Between U.S. Federal Statutory Rate and Effective Income Tax Rate Footnote (Detail) - USD ($) $ in Millions	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 12, 2015
Schedule Of Effective Tax Rates Line Items
Foreign earnings repatriated		$ 42.5	$ 308.4	$ 1,400
Repatriation of foreign earnings		$ 9.1	$ 67.5	$ 350.2
Foreign income tax rate differential		13.50%	19.30%	22.00%
Provisional tax benefit related to remeasurement of deferred tax balances		$ 62.3
Reduction in federal statutory rate		35.00%	35.00%	35.00%
Provisional tax expense related to transition tax on foreign earnings		$ 429.2
Net benefit from release of tax reserves				$ 42.7
Jordan Bromine Company Limited
Schedule Of Effective Tax Rates Line Items
Foreign income tax rate differential		8.90%	7.30%	8.20%
Rockwood Holdings, Inc.
Schedule Of Effective Tax Rates Line Items
Foreign earnings repatriated				$ 111
Repatriation of foreign earnings				327.9
Undistributed earnings of foreign subsidiaries					$ 387
Reversal of deferred tax liability, undistributed foreign earnings, impact on earnings				356.2
Reversal of deferred tax liability, undistributed foreign earnings, foreign exchange				$ 30.8
Subsequent Event
Schedule Of Effective Tax Rates Line Items
Reduction in federal statutory rate	21.00%

Income Taxes Deferred Income Ta

Income Taxes Deferred Income Tax Assets and Liabilities Recorded on Consolidated Balance Sheets (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Accrued employee benefits	$ 21,463	$ 32,622
Accrued expenses	0	10,065
Operating loss carryovers(a)	459,644	91,934
Pensions	64,799	96,635
Tax credit carryovers	11,634	1,029
Other	44,714	34,866
Gross deferred tax assets	602,254	267,151
Valuation allowance(a)	(458,288)	(69,900)	$ (84,137)	$ (30,768)
Deferred tax assets	143,966	197,251
Deferred tax liabilities:
Depreciation	(334,162)	(379,161)
Intangibles	(113,792)	(99,969)
Hedge of Net Investment of Foreign Subsidiary	(17,028)	(51,192)
Other	(24,265)	(18,536)
Deferred tax liabilities	(489,247)	(548,858)
Noncurrent deferred tax assets	25,108	61,132
Noncurrent deferred tax liabilities	(370,389)	(412,739)
Deferred Tax Liabilities, Net	$ (345,281)	$ (351,607)

Income Taxes Changes in Balance

Income Taxes Changes in Balance of Deferred Tax Asset Valuation Allowance (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Deferred Tax Asset Valuation Allowance [Roll Forward]
Beginning Balance	$ (69,900)	$ (84,137)	$ (30,768)
Additions	(408,252)	(20,568)	(59,889)
Deductions	19,864	34,805	6,520
Ending Balance	$ (458,288)	$ (69,900)	$ (84,137)

Income Taxes Reconciliation of

Income Taxes Reconciliation of Total Gross Liability Related to Uncertain Tax Positions (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning Balance	$ 25,384	$ 95,715	$ 24,969
Acquisition of Rockwood	0	0	124,758
Divestitures	0	(55,881)	0
Additions for tax positions related to prior years	0	548	4,329
Reductions for tax positions related to prior years	(1,933)	(1,253)	(46,211)
Additions for tax positions related to current year	1,132	1,271	202
Lapses in statutes of limitations/settlements	(4,198)	(12,591)	(6,736)
Foreign currency translation adjustment	1,053	(2,425)	(5,596)
Ending Balance	$ 21,438	$ 25,384	$ 95,715

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
Reduction in federal statutory rate		35.00%	35.00%	35.00%
Provisional tax benefit related to remeasurement of deferred tax balances		$ 62,300
Provisional tax expense related to transition tax on foreign earnings		429,200
Increase in Federal deferred benefit		70,800
Increase in valuation allowance		408,252	$ 20,568	$ 59,889
Tax credit carryovers		11,634	1,029
Valuation allowance on deferred tax asset		458,288	69,900	84,137	$ 30,768
Cumulative undistributed earnings of foreign subsidiaries		4,800,000
Income tax benefit related to previously taxed foreign earnings		9,700
Liabilities related to uncertain tax position		24,369	27,919
Unrecognized tax benefits, income tax penalties and interest accrued		2,900	3,000
Assets offsetting unrecognized tax benefits		14,600	15,100
Unrecognized tax benefits net of offsetting assets		6,900	9,800
Unrecognized tax benefits		21,438	$ 25,384	$ 95,715	$ 24,969
Decrease in liability related to uncertain tax positions		1,600
Domestic Country
Income Taxes [Line Items]
Tax credit carryovers		11,600
Valuation allowance on deferred tax asset		300
Net operating loss carryovers		156,100
Operating loss carryover, valuation allowance		39,300
State and Local Jurisdiction
Income Taxes [Line Items]
Capital loss carryover, valuation allowance		8,700
Foreign Country
Income Taxes [Line Items]
Valuation allowance on deferred tax asset		34,400
Net operating loss carryovers		1,750,000
Operating loss carryover, valuation allowance		1,730,000
Subsequent Event
Income Taxes [Line Items]
Reduction in federal statutory rate	21.00%
Rockwood Holdings, Inc.
Income Taxes [Line Items]
Increase in federal current expense related to transition tax on foreign earnings		387,000
Change in Estimate, Foreign Net Operating Loss
Income Taxes [Line Items]
Increase in valuation allowance		$ 400,600

Fair Value of Financial Inst118

Fair Value of Financial Instruments Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Total long-term debt, excluding debt issuance costs	$ 1,845,309	$ 2,381,370
Total long-term debt, fair value, excluding debt issuance costs	$ 1,949,638	$ 2,472,813

Fair Value of Financial Inst119

Fair Value of Financial Instruments - Additional Information (Details) - Forward Contracts - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative, notional amount	$ 357.4	$ 251.6
Accrued expenses
Fair Value, Option, Quantitative Disclosures [Line Items]
Fair value foreign currency forward contracts, liabilities	5	0.2
Other (expenses) income, net
Fair Value, Option, Quantitative Disclosures [Line Items]
Recognized gains (losses) of foreign currency forward contracts	4.6	16.1	$ (38.5)
Other, net
Fair Value, Option, Quantitative Disclosures [Line Items]
Change in the fair value of foreign currency forward contracts	(4.6)	(16.1)	38.5
Cash receipts	$ 9.4	$ 16
Cash (settlements)			$ (37.6)

Fair Value Measurement Financia

Fair Value Measurement Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	$ 25,494,000	$ 22,037,000
Private equity securities	38,000	35,000
Private equity securities measured at net asset value	5,121,000	5,498,000
Obligations under executive deferred compensation plan	25,494,000	22,037,000
Foreign currency forward contracts, liabilities	4,954,000	182,000
Transfers between levels 1 and 2	0
Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	659,874,000	606,957,000
Other Postretirement Benefits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	834,000	2,232,000	$ 3,292,000
Quoted Prices in Active Markets for Identical Items (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	25,494,000	22,037,000
Private equity securities	38,000	35,000
Private equity securities measured at net asset value	0	0
Obligations under executive deferred compensation plan	25,494,000	22,037,000
Foreign currency forward contracts, liabilities	0	0
Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	493,848,000	460,247,000
Quoted Prices in Active Markets for Identical Items (Level 1) | Other Postretirement Benefits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets for Similar Items (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	0	0
Private equity securities	0	0
Private equity securities measured at net asset value	0	0
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	4,954,000	182,000
Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	69,612,000	60,598,000
Quoted Prices in Active Markets for Similar Items (Level 2) | Other Postretirement Benefits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	834,000	2,232,000
Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments under executive deferred compensation plan	0	0
Private equity securities	0	0
Private equity securities measured at net asset value	0	0
Obligations under executive deferred compensation plan	0	0
Foreign currency forward contracts, liabilities	0	0
Unobservable Inputs (Level 3) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Other Postretirement Benefits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	0	0
Measured at Fair Value | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	563,460,000	520,845,000
Measured at Fair Value | Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	493,848,000	460,247,000
Measured at Fair Value | Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	69,612,000	60,598,000
Measured at Fair Value | Unobservable Inputs (Level 3) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	0	0
Absolute Return Measured At Net Asset Value | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	96,414,000	86,112,000
Absolute Return Measured At Net Asset Value | Quoted Prices in Active Markets for Identical Items (Level 1) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	0	0
Absolute Return Measured At Net Asset Value | Quoted Prices in Active Markets for Similar Items (Level 2) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	0	0
Absolute Return Measured At Net Asset Value | Unobservable Inputs (Level 3) | Pension Plans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of plan assets	$ 0	$ 0

Related Party Transactions (Det

Related Party Transactions (Details) - Unconsolidated Affiliates - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Related Party Transaction [Line Items]
Sales to unconsolidated affiliates	$ 29,514	$ 29,651	$ 24,180
Purchases from unconsolidated affiliates(a)	209,266	130,287	$ 115,697
Receivable from related parties	2,406	2,159
Payable to related parties	$ 55,801	$ 38,466

Segment and Geographic Area 122

Segment and Geographic Area Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017segment
Segment Reporting [Abstract]
Number of reportable segments	3

Segment and Geographic Area 123

Segment and Geographic Area Information Summarized Financial Information by Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 857,789	$ 754,866	$ 737,258	$ 722,063	$ 696,655	$ 654,010	$ 669,327	$ 657,211	$ 3,071,976	$ 2,677,203	$ 2,826,429
Adjusted EBITDA									885,480	758,217	756,000
Net income (loss) attributable to Albemarle Corporation	$ 218,366	$ (118,670)	$ (103,333)	$ (51,213)	(602,090)	(128,220)	314,821	(228,186)	(54,850)	(643,675)	(334,906)
Depreciation and amortization									196,928	226,169	260,076
(Gain) loss on sales of businesses, net					0	0	(974)	(121,324)	0	(122,298)	0
Restructuring and other, net									0	0	(6,804)
Gain on acquisition									(6,221)	0	0
Acquisition and integration related costs					13,047	6,749	19,030	18,558	0	57,384	132,299
Interest and financing expenses									115,350	65,181	81,650
Income tax expense									431,817	96,263	11,134
Income from discontinued operations (net of tax)					$ (559,974)	$ (23,185)	$ 398,340	$ (17,312)	0	(202,131)	(32,476)
Note receivable reserve									28,700
Lithium and Advanced Materials
Segment Reporting Information [Line Items]
Net sales									1,308,153	968,216	834,590
All Other
Segment Reporting Information [Line Items]
Net sales									128,914	180,988	471,434
Adjusted EBITDA									13,878	14,772	53,993
Depreciation and amortization									8,357	7,302	18,183
Reportable Segments | Lithium and Advanced Materials
Segment Reporting Information [Line Items]
Net sales									1,308,153	968,216	834,590
Adjusted EBITDA									518,530	363,360	312,867
Depreciation and amortization									102,389	101,966	84,069
Reportable Segments | Bromine Specialties
Segment Reporting Information [Line Items]
Net sales									855,143	792,425	775,729
Adjusted EBITDA									258,901	226,926	222,653
Depreciation and amortization									40,062	39,562	36,179
Reportable Segments | Refining Solutions
Segment Reporting Information [Line Items]
Net sales									778,304	732,137	729,261
Adjusted EBITDA									212,005	238,963	197,595
Depreciation and amortization									39,958	36,089	34,039
Corporate
Segment Reporting Information [Line Items]
Net sales									1,462	3,437	15,415
Adjusted EBITDA									(117,834)	(85,804)	(31,108)
Depreciation and amortization									6,162	6,056	8,703
Continuing Operations
Segment Reporting Information [Line Items]
Adjusted EBITDA									885,480	758,217	756,000
Net income (loss) attributable to Albemarle Corporation									54,850	643,675	334,906
Depreciation and amortization									196,928	190,975	181,173
(Gain) loss on sales of businesses, net										(122,298)
Utilization of inventory markup									23,095		83,006
Restructuring and other, net									17,056		(6,804)
Gain on acquisition									(6,221)
Acquisition and integration related costs									33,954	57,384	132,299
Interest and financing expenses									115,350	65,181	81,650
Income tax expense									431,817	96,263	11,134
Income from discontinued operations (net of tax)										(202,131)	(32,476)
Non-operating pension and OPEB items									(16,125)	25,589	(35,300)
Multiemployer plan shortfall contributions									7,887
Note receivable reserve									28,730
Other									(1,841)	3,579	6,412
Continuing Operations | All Other
Segment Reporting Information [Line Items]
Adjusted EBITDA									13,878	14,772	53,993
Net income (loss) attributable to Albemarle Corporation									5,521	131,301	32,781
Depreciation and amortization									8,357	7,302	18,183
(Gain) loss on sales of businesses, net										(123,831)
Utilization of inventory markup									0		3,029
Restructuring and other, net									0		0
Gain on acquisition									0
Acquisition and integration related costs									0	0	0
Interest and financing expenses									0	0	0
Income tax expense									0	0	0
Income from discontinued operations (net of tax)										0	0
Non-operating pension and OPEB items									0	0	0
Multiemployer plan shortfall contributions									0
Note receivable reserve									0
Other									0	0	0
Continuing Operations | Reportable Segments | Lithium and Advanced Materials
Segment Reporting Information [Line Items]
Adjusted EBITDA									518,530	363,360	312,867
Net income (loss) attributable to Albemarle Corporation									400,360	261,394	148,821
Depreciation and amortization									102,389	101,966	84,069
(Gain) loss on sales of businesses, net										0
Utilization of inventory markup									23,095		79,977
Restructuring and other, net									0		0
Gain on acquisition									(6,221)
Acquisition and integration related costs									0	0	0
Interest and financing expenses									0	0	0
Income tax expense									0	0	0
Income from discontinued operations (net of tax)										0	0
Non-operating pension and OPEB items									0	0	0
Multiemployer plan shortfall contributions									0
Note receivable reserve									0
Other									(1,093)	0	0
Continuing Operations | Reportable Segments | Bromine Specialties
Segment Reporting Information [Line Items]
Adjusted EBITDA									258,901	226,926	222,653
Net income (loss) attributable to Albemarle Corporation									218,839	187,364	186,474
Depreciation and amortization									40,062	39,562	36,179
(Gain) loss on sales of businesses, net										0
Utilization of inventory markup									0		0
Restructuring and other, net									0		0
Gain on acquisition									0
Acquisition and integration related costs									0	0	0
Interest and financing expenses									0	0	0
Income tax expense									0	0	0
Income from discontinued operations (net of tax)										0	0
Non-operating pension and OPEB items									0	0	0
Multiemployer plan shortfall contributions									0
Note receivable reserve									0
Other									0	0	0
Continuing Operations | Reportable Segments | Refining Solutions
Segment Reporting Information [Line Items]
Adjusted EBITDA									212,005	238,963	197,595
Net income (loss) attributable to Albemarle Corporation									173,297	202,874	161,585
Depreciation and amortization									39,958	36,089	34,039
(Gain) loss on sales of businesses, net										0
Utilization of inventory markup									0		0
Restructuring and other, net									0		0
Gain on acquisition									0
Acquisition and integration related costs									0	0	0
Interest and financing expenses									0	0	0
Income tax expense									0	0	0
Income from discontinued operations (net of tax)										0	0
Non-operating pension and OPEB items									0	0	0
Multiemployer plan shortfall contributions									0
Note receivable reserve									0
Other									(1,250)	0	1,971
Continuing Operations | Reportable Segments | Reportable Segments Total
Segment Reporting Information [Line Items]
Adjusted EBITDA									989,436	829,249	733,115
Net income (loss) attributable to Albemarle Corporation									792,496	651,632	496,880
Depreciation and amortization									182,409	177,617	154,287
(Gain) loss on sales of businesses, net										0
Utilization of inventory markup									23,095		79,977
Restructuring and other, net									0		0
Gain on acquisition									(6,221)
Acquisition and integration related costs									0	0	0
Interest and financing expenses									0	0	0
Income tax expense									0	0	0
Income from discontinued operations (net of tax)										0	0
Non-operating pension and OPEB items									0	0	0
Multiemployer plan shortfall contributions									0
Note receivable reserve									0
Other									(2,343)	0	1,971
Continuing Operations | Corporate
Segment Reporting Information [Line Items]
Adjusted EBITDA									(117,834)	(85,804)	(31,108)
Net income (loss) attributable to Albemarle Corporation									(743,167)	(139,258)	(194,755)
Depreciation and amortization									6,162	6,056	8,703
(Gain) loss on sales of businesses, net										1,533
Utilization of inventory markup									0		0
Restructuring and other, net									17,056		(6,804)
Gain on acquisition									0
Acquisition and integration related costs									33,954	57,384	132,299
Interest and financing expenses									115,350	65,181	81,650
Income tax expense									431,817	96,263	11,134
Income from discontinued operations (net of tax)										(202,131)	(32,476)
Non-operating pension and OPEB items									(16,125)	25,589	(35,300)
Multiemployer plan shortfall contributions									7,887
Note receivable reserve									28,730
Other									$ 502	$ 3,579	$ 4,441

Segment and Geographic Area 124

Segment and Geographic Area Information Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Feb. 01, 2017	Jan. 12, 2015
Segment Reporting Information [Line Items]
Restructuring and other, net	$ 0	$ 0	$ (6,804)
Loss on extinguishment of debt	(52,801)	(1,921)	(5,353)
Cost of sales
Segment Reporting Information [Line Items]
Restructuring and other, net	2,900
Reversal of a liability from an abandoned project	1,300
Research and development expenses
Segment Reporting Information [Line Items]
Restructuring and other, net	5,700
Write-off of fixed assets		1,400
Selling, general and administrative expenses
Segment Reporting Information [Line Items]
Restructuring and other, net	8,400
Reversal of purchase accounting accrual	1,000
Net gain (loss) on sales of properties		(900)
Other (expenses) income, net
Segment Reporting Information [Line Items]
Asset retirement obligation charges	3,200
Net gain (loss) on sales of properties	(4,100)	1,100
Revision of tax indemnification expense	3,700
Settlement of a legal claim	1,000
Reversal of a liability from previous acquisition	10,600
Reversal of a liability from previous business	1,100
Environmental charges		2,400
Jiangxi Jiangli New Materials Science and Technology Co. Ltd.
Segment Reporting Information [Line Items]
Inventory markup	23,100
Jiangxi Jiangli New Materials Science and Technology Co. Ltd. | Cost of sales
Segment Reporting Information [Line Items]
Utilization of inventory markup	$ 23,100
Sales de Magnesio Ltda.
Segment Reporting Information [Line Items]
Percentage of equity interests acquired				50.00%
Rockwood Holdings, Inc.
Segment Reporting Information [Line Items]
Inventory markup					$ 103,400
Utilization of inventory markup		$ 103,400
Rockwood Holdings, Inc. | Cost of sales
Segment Reporting Information [Line Items]
Utilization of inventory markup			55,900
Rockwood Holdings, Inc. | Equity in net income of unconsolidated investments
Segment Reporting Information [Line Items]
Utilization of inventory markup			27,100
Refining Solutions | Fabrica Carioca de Catalisadores S.A.
Segment Reporting Information [Line Items]
Unconsolidated investment impairment charges			2,000
Corporate | Rockwood Holdings, Inc.
Segment Reporting Information [Line Items]
Acquisition financing-related fees			4,400
Phosphorus Flame Retardant Business Exit
Segment Reporting Information [Line Items]
Exit of phosphorus flame retardants business			$ 6,800

Segment and Geographic Area 125

Segment and Geographic Area Information Identifiable Assets and Goodwill by Reportable Segments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Identifiable assets	$ 7,750,772	$ 8,161,207	$ 9,597,954
Goodwill	1,610,355	1,540,032	1,460,552
All Other
Segment Reporting Information [Line Items]
Identifiable assets	126,486	130,595	517,695
Goodwill	6,586	6,586	0
Reportable Segments | Lithium and Advanced Materials
Segment Reporting Information [Line Items]
Identifiable assets	4,057,242	3,809,883	3,658,669
Goodwill	1,396,140	1,348,261	1,267,505
Reportable Segments | Bromine Specialties
Segment Reporting Information [Line Items]
Identifiable assets	745,007	724,218	699,929
Goodwill	20,319	20,319	20,319
Reportable Segments | Refining Solutions
Segment Reporting Information [Line Items]
Identifiable assets	1,016,519	913,923	937,445
Goodwill	187,310	164,866	172,728
Corporate
Segment Reporting Information [Line Items]
Identifiable assets	1,805,518	2,582,588	575,314
Discontinued Operations
Segment Reporting Information [Line Items]
Identifiable assets	$ 0	$ 0	$ 3,208,902

Segment and Geographic Area 126

Segment and Geographic Area Information Depreciation and Amortization and Capital Expenditures by Reportable Segments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Depreciation and amortization	$ 196,928	$ 226,169	$ 260,076
Capital expenditures	317,703	196,654	227,649
All Other
Segment Reporting Information [Line Items]
Depreciation and amortization	8,357	7,302	18,183
Capital expenditures	3,657	9,251	13,054
Reportable Segments | Lithium and Advanced Materials
Segment Reporting Information [Line Items]
Depreciation and amortization	102,389	101,966	84,069
Capital expenditures	207,410	91,967	104,344
Reportable Segments | Bromine Specialties
Segment Reporting Information [Line Items]
Depreciation and amortization	40,062	39,562	36,179
Capital expenditures	46,427	46,414	54,994
Reportable Segments | Refining Solutions
Segment Reporting Information [Line Items]
Depreciation and amortization	39,958	36,089	34,039
Capital expenditures	31,716	27,546	28,836
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization	6,162	6,056	8,703
Capital expenditures	28,493	2,195	2,683
Discontinued Operations
Segment Reporting Information [Line Items]
Depreciation and amortization	0	35,194	78,903
Capital expenditures	$ 0	$ 19,281	$ 23,738

Segment and Geographic Area 127

Segment and Geographic Area Information Net Sales by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 857,789	$ 754,866	$ 737,258	$ 722,063	$ 696,655	$ 654,010	$ 669,327	$ 657,211	$ 3,071,976	$ 2,677,203	$ 2,826,429
Sales in china to total net sales maximum percentage									15.00%	13.00%
Sales in any foreign country to total net sales maximum percentage									10.00%	10.00%	10.00%
United States
Segment Reporting Information [Line Items]
Net sales									$ 840,589	$ 797,267	$ 911,519
Foreign
Segment Reporting Information [Line Items]
Net sales									$ 2,231,387	$ 1,879,936	$ 1,914,910

Segment and Geographic Area 128

Segment and Geographic Area Information Long-Lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Long-lived assets	$ 2,996,661	$ 2,793,599	$ 2,735,879
United States
Segment Reporting Information [Line Items]
Long-lived assets	833,002	850,689	800,214
Chile
Segment Reporting Information [Line Items]
Long-lived assets	1,069,859	922,878	916,965
Netherlands
Segment Reporting Information [Line Items]
Long-lived assets	171,980	145,917	155,128
Jordan
Segment Reporting Information [Line Items]
Long-lived assets	242,626	227,222	230,460
Australia
Segment Reporting Information [Line Items]
Long-lived assets	364,624	288,553	280,222
Brazil
Segment Reporting Information [Line Items]
Long-lived assets	47,255	46,380	39,299
Germany
Segment Reporting Information [Line Items]
Long-lived assets	115,305	117,027	137,890
China
Segment Reporting Information [Line Items]
Long-lived assets	50,532	31,564	4,773
France
Segment Reporting Information [Line Items]
Long-lived assets	40,852	39,470	39,344
Korea(b)
Segment Reporting Information [Line Items]
Long-lived assets	495	65,963	72,685
Other foreign countries
Segment Reporting Information [Line Items]
Long-lived assets	$ 60,131	$ 57,936	$ 58,899

Segment and Geographic Area 129

Segment and Geographic Area Information Net Sales to External Customers by Product Category (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Net sales	$ 857,789	$ 754,866	$ 737,258	$ 722,063	$ 696,655	$ 654,010	$ 669,327	$ 657,211	$ 3,071,976	$ 2,677,203	$ 2,826,429
Lithium and Advanced Materials
Segment Reporting Information [Line Items]
Net sales									1,308,153	968,216	834,590
Lithium and Advanced Materials | Lithium
Segment Reporting Information [Line Items]
Net sales									1,018,885	668,852	508,844
Lithium and Advanced Materials | Performance Catalyst Solutions
Segment Reporting Information [Line Items]
Net sales									289,268	299,364	325,746
Bromine Specialties | Bromine Specialties
Segment Reporting Information [Line Items]
Net sales									855,143	792,425	775,729
Refining Solutions | Refining Solutions
Segment Reporting Information [Line Items]
Net sales									$ 778,304	$ 732,137	$ 729,261

Quarterly Financial Summary 130

Quarterly Financial Summary (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 857,789	$ 754,866	$ 737,258	$ 722,063	$ 696,655	$ 654,010	$ 669,327	$ 657,211	$ 3,071,976	$ 2,677,203	$ 2,826,429
Gross profit	307,009	275,789	272,094	255,088	240,966	238,972	248,104	242,534	1,109,980	970,576	860,233
Gain on sales of businesses, net					0	0	(974)	(121,324)	0	(122,298)	0
Acquisition and integration related costs					13,047	6,749	19,030	18,558	0	57,384	132,299
Net income (loss) from continuing operations	(207,071)	130,193	113,689	62,657	50,304	114,512	95,586	218,236	99,468	478,638	327,588
Income (loss) from discontinued operations (net of tax)					559,974	23,185	(398,340)	17,312	0	202,131	32,476
Net income attributable to noncontrolling interests	(11,295)	(11,523)	(10,356)	(11,444)	(8,188)	(9,477)	(12,067)	(7,362)	(44,618)	(37,094)	(25,158)
Net income (loss) attributable to Albemarle Corporation	$ (218,366)	$ 118,670	$ 103,333	$ 51,213	$ 602,090	$ 128,220	$ (314,821)	$ 228,186	$ 54,850	$ 643,675	$ 334,906
Basic earnings (loss) per share:
Basic earnings (loss) per share from continuing operations (in dollars per share)	$ (1.98)	$ 1.07	$ 0.93	$ 0.46	$ 0.37	$ 0.93	$ 0.74	$ 1.88	$ 0.49	$ 3.93	$ 2.72
Basic earnings (loss) per share from discontinued operations (in dollars per share)					4.98	0.21	(3.54)	0.15	0	1.80	0.29
Basic earnings per share (in dollars per share)					$ 5.35	$ 1.14	$ (2.80)	$ 2.03	$ 0.49	$ 5.73	$ 3.01
Weighted-average common shares outstanding—basic (in shares)	110,510	110,476	110,686	111,986	112,487	112,429	112,339	112,260	110,914	112,379	111,182
Diluted earnings (loss) per share:
Diluted earnings (loss) per share from continuing operations (in dollars per share)	$ (1.95)	$ 1.06	$ 0.92	$ 0.45	$ 0.37	$ 0.93	$ 0.74	$ 1.87	$ 0.49	$ 3.90	$ 2.71
Diluted earnings (loss) per share from discontinued operations (in dollars per share)					4.93	0.20	(3.52)	0.15	0	1.78	0.29
Diluted earnings per share (in dollars per share)					$ 5.30	$ 1.13	$ (2.78)	$ 2.02	$ 0.49	$ 5.68	$ 3
Weighted-average common shares outstanding—diluted (in shares)	112,152	111,975	112,105	113,289	113,563	113,448	113,175	112,770	112,380	113,239	111,556

Quarterly Financial Summary 131

Quarterly Financial Summary (Unaudited) (Footnote) (Detail) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Gain (loss) on sales of businesses, net	$ 0	$ 0	$ 974	$ 121,324	$ 0	$ 122,298	$ 0
Metal Sulfides Business
Gain (loss) on sales of businesses, net						11,500
Mineral Flame Retardants and Specialty Chemicals Businesses
Gain (loss) on sales of businesses, net						112,300
Chemetall Surface Treatment
Gain (loss) on sales of businesses, net					$ 257,000
Discrete non-cash charge			$ 416,700
Gain on sale of business, net of tax	$ 135,000
Corporate | Wafer Reclaim
Gain (loss) on sales of businesses, net						$ (1,500)

Quarterly Financial Summary 132

Quarterly Financial Summary (Unaudited) - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Actuarial gain (losses)	$ 11.4	$ (26.7)
Actuarial gain (losses), net of income tax	$ 7.3	$ (18.3)