IPG Photonics (IPGP) 10-Q 4 May 18 2018 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2018	May 02, 2018
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2,018
Entity Registrant Name	IPG PHOTONICS CORP
Entity Central Index Key	1,111,928
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding (in shares)		53,694,483

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
CURRENT ASSETS:
Cash and cash equivalents	$ 969,123	$ 909,900
Short-term investments	206,786	206,257
Accounts receivable, net	235,477	237,278
Inventories	356,375	307,712
Prepaid income taxes	42,430	44,944
Prepaid expenses and other current assets	54,695	47,919
Total current assets	1,864,886	1,754,010
DEFERRED INCOME TAXES, NET	24,940	26,976
GOODWILL	55,705	55,831
INTANGIBLE ASSETS, NET	49,284	51,223
PROPERTY, PLANT AND EQUIPMENT, NET	483,907	460,206
OTHER ASSETS	19,285	19,009
TOTAL	2,498,007	2,367,255
CURRENT LIABILITIES:
Current portion of long-term debt	3,621	3,604
Accounts payable	33,369	35,109
Accrued expenses and other liabilities	135,750	144,417
Income taxes payable	22,820	15,773
Total current liabilities	195,560	198,903
DEFERRED INCOME TAXES AND OTHER LONG-TERM LIABILITIES	112,612	100,652
LONG-TERM DEBT, NET OF CURRENT PORTION	44,466	45,378
Total liabilities	352,638	344,933
COMMITMENTS AND CONTINGENCIES (NOTE 12)
IPG PHOTONICS CORPORATION EQUITY:
Common stock, $0.0001 par value, 175,000,000 shares authorized; 54,204,016 and 53,742,849 shares issued and outstanding, respectively, at March 31, 2018; 54,007,708 and 53,629,439 shares issued and outstanding, respectively, at December 31, 2017	5	5
Treasury stock, at cost (461,167 and 378,269 shares held)	(69,004)	(48,933)
Additional paid-in capital	714,255	704,727
Retained earnings	1,550,807	1,443,867
Accumulated other comprehensive loss	(50,694)	(77,344)
Total IPG Photonics Corporation equity	2,145,369	2,022,322
TOTAL	$ 2,498,007	$ 2,367,255

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	175,000,000	175,000,000
Common stock, shares issued (in shares)	54,204,016	54,007,708
Common stock, shares outstanding (in shares)	53,742,849	53,629,439
Treasury stock, shares (in shares)	461,167	378,269

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
NET SALES	$ 359,864	$ 285,846
COST OF SALES	156,502	128,579
GROSS PROFIT	203,362	157,267
OPERATING EXPENSES:
Sales and marketing	13,516	10,827
Research and development	28,546	22,780
General and administrative	25,495	17,726
(Gain) loss on foreign exchange	(5,295)	4,453
Total operating expenses	62,262	55,786
OPERATING INCOME	141,100	101,481
OTHER INCOME (EXPENSE), Net:
Interest income, net	311	308
Other income (expense), net	443	(529)
Total other income (expense)	754	(221)
INCOME BEFORE PROVISION FOR INCOME TAXES	141,854	101,260
PROVISION FOR INCOME TAXES	(35,520)	(26,328)
NET INCOME	106,334	74,932
LESS: NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	(13)
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION	$ 106,334	$ 74,945
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE:
Basic (in dollars per share)	$ 1.98	$ 1.40
Diluted (in dollars per share)	$ 1.93	$ 1.38
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	53,694	53,368
Diluted (in shares)	55,182	54,370

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 106,334	$ 74,932
Other comprehensive income, net of tax:
Translation adjustments	26,638	26,699
Unrealized gain (loss) on derivatives	2	(16)
Effect of adopted accounting standards	10	0
Loss on available-for-sale investments, net of tax reclassified to net income	0	298
Total other comprehensive loss	26,650	26,981
Comprehensive income	132,984	101,913
Comprehensive loss attributable to noncontrolling interest	0	11
Comprehensive income attributable to IPG Photonics Corporation	$ 132,984	$ 101,902

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 106,334	$ 74,932
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	19,223	14,504
Deferred income taxes	7,401	4,208
Stock-based compensation	6,415	5,351
Unrealized (gains) losses on foreign currency transactions	(1,991)	3,462
Other	4	842
Provisions for inventory, warranty & bad debt	9,318	9,002
Changes in assets and liabilities that (used) provided cash:
Accounts receivable	7,942	(22,801)
Inventories	(49,744)	(22,408)
Prepaid expenses and other current assets	(2,138)	(3,972)
Accounts payable	1,134	(1,560)
Accrued expenses and other liabilities	(9,509)	(659)
Income and other taxes payable	5,264	(10,081)
Net cash provided by operating activities	99,653	50,820
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of and deposits on property, plant and equipment	(39,113)	(21,875)
Proceeds from sales of property, plant and equipment	210	99
Purchases of short-term investments	(70,777)	(28,173)
Proceeds from sales of short-term investments	70,161	70,370
Other	76	(47)
Net cash (used in) provided by investing activities	(39,443)	20,374
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line-of-credit facilities	255	1,934
Payments on line-of-credit facilities	(255)	(1,934)
Principal payments on long-term borrowings	(895)	(797)
Proceeds from issuance of common stock under employee stock option and purchase plans less payments for taxes related to net share settlement of equity awards	3,113	9,600
Purchase of treasury stock, at cost	(20,071)	(12,539)
Net cash used in financing activities	(17,853)	(3,736)
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	16,866	6,465
NET INCREASE IN CASH AND CASH EQUIVALENTS	59,223	73,923
CASH AND CASH EQUIVALENTS — Beginning of period	909,900	623,855
CASH AND CASH EQUIVALENTS — End of period	969,123	697,778
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	799	447
Cash paid for income taxes	19,546	31,371
Non-cash transactions:
Demonstration units transferred from inventory to other assets	446	802
Inventory transferred to machinery and equipment	1,618	1,051
Changes in accounts payable related to property, plant and equipment	$ (3,296)	$ (1,310)

Consolidated Statements Of Equi

Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	COMMON STOCK	TREASURY STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE LOSS	TOTAL IPG PHOTONICS CORPORATION EQUITY	NONCONTROLLING INTERESTS (NCI)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of adopted accounting standards				$ 2,078	$ 2,145
Balance, beginning of year (in shares) at Dec. 31, 2016		53,251,805	102,774
Balance, beginning of year at Dec. 31, 2016		$ 5	$ (8,946)	650,974	1,094,108	$ (178,583)		$ 166
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and conversion of restricted stock units (in shares)		281,840
Exercise of stock options and conversion of restricted stock units		$ 0
Purchased common stock (in shares)		(107,700)	(107,700)
Purchased common stock		$ 0	$ (12,539)
Stock-based compensation				5,351
Common stock issued under employee stock option plan, net of shares withheld for employee taxes				9,600
Net income attributable to IPG Photonics Corporation	$ 74,945				74,945
Translation adjustments	26,699					26,675
Unrealized gain (loss) on derivatives, net of tax	(16)					(16)
Unrealized loss on available-for-sale investments, net of tax	298					(240)
Realized loss on available-for-sale investments, net of tax, reclassified to net income						538
Net loss attributable to NCI	(13)							(13)
Other comprehensive income attributable to NCI	11							24
Balance, end of period (in shares) at Mar. 31, 2017		53,425,945	210,474
Balance, end of period at Mar. 31, 2017	1,666,272	$ 5	$ (21,485)	668,003	1,171,198	(151,626)	$ 1,666,095	177
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Effect of adopted accounting standards				0	606	10
Balance, beginning of year (in shares) at Dec. 31, 2017		53,629,439	378,269
Balance, beginning of year at Dec. 31, 2017		$ 5	$ (48,933)	704,727	1,443,867	(77,344)		0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and conversion of restricted stock units (in shares)		196,308
Exercise of stock options and conversion of restricted stock units		$ 0
Purchased common stock (in shares)		(82,898)	(82,898)
Purchased common stock		$ 0	$ (20,071)
Stock-based compensation				6,415
Common stock issued under employee stock option plan, net of shares withheld for employee taxes				3,113
Net income attributable to IPG Photonics Corporation	106,334				106,334
Translation adjustments	26,638					26,638
Unrealized gain (loss) on derivatives, net of tax	2					2
Unrealized loss on available-for-sale investments, net of tax	0					0
Realized loss on available-for-sale investments, net of tax, reclassified to net income						0
Net loss attributable to NCI	0							0
Other comprehensive income attributable to NCI	0							0
Balance, end of period (in shares) at Mar. 31, 2018		53,742,849	461,167
Balance, end of period at Mar. 31, 2018	$ 2,145,369	$ 5	$ (69,004)	$ 714,255	$ 1,550,807	$ (50,694)	$ 2,145,369	$ 0

Basis Of Presentation And Signi

Basis Of Presentation And Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation and Significant Accounting Policies	BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation — The accompanying unaudited consolidated financial statements have been prepared by IPG Photonics Corporation, or "IPG", "its" or the "Company". Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). The consolidated financial statements include the Company's accounts and those of its subsidiaries. All intercompany balances have been eliminated in consolidation. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 . In the opinion of the Company's management, the unaudited financial information for the interim periods presented reflects all adjustments necessary for a fair presentation of the Company's financial position, results of operations and cash flows. The results reported in these consolidated financial statements are not necessarily indicative of results that may be expected for the entire year. The Company has evaluated subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC. In accordance with Accounting Standards Codification ("ASC") 606, "Revenue from Contracts with Customers," ("ASC 606" or the "new revenue standard"), the following significant accounting policies have been adopted as of January 1, 2018. Revenue Recognition — Revenue is recognized when transfer of control to the customer occurs in an amount reflecting the consideration that the Company expects to be entitled. In order to achieve this core principle, the Company applies the following five step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when a performance obligation is satisfied. The Company considers customer purchase orders, which in some cases are governed by master sales agreements, to be the contracts with a customer. As part of its consideration of the contract, the Company evaluates certain factors including the customer's ability to pay (or credit risk). For each contract, the Company considers the promise to transfer products, each of which is distinct as the identified performance obligations. In determining the transaction price, the Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the Company expects to be entitled. As the Company's standard payment terms are less than one year, the Company has elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company allocates the transaction price to each distinct product based on its relative standalone selling price. Revenue is recognized when control of the product is transferred to the customer (i.e., when the Company's performance obligation is satisfied), which typically occurs at shipment. The Company often receives orders with multiple delivery dates that may extend across several reporting periods. The Company allocates the transaction price of the contract to each delivery based on the product standalone selling price. The Company invoices for each scheduled delivery upon shipment and recognizes revenues for such delivery at that point, assuming transfer of control has occurred. As scheduled delivery dates are generally within one year, under the optional exemption provided by ASC 606-10-50-14 revenues allocated to future shipments of partially completed contracts are not disclosed. Rights of return generally are not included in customer contracts. Accordingly, upon application of steps one through five above, product revenue is recognized upon shipment and transfer of control. Returns are infrequent and are recorded as a reduction of revenue. In certain subsidiaries the Company provides sales commissions to sales representatives based on sales volume. The Company has determined that the incentive portions of its sales commissions qualify as contract costs. The Company has elected the practical expedient in ASC 340-40-25-4 to expense sales commissions when incurred as the amortization period of the asset that would otherwise have been recognized is one year or less. Revenue Recognition at a Point in Time — Revenues recognized at a point in time consist primarily of product, installation, and service sales. The Company sells products to original equipment manufacturers ("OEMs"), that supply materials processing laser systems, communications systems, medical laser systems and other laser systems for advanced applications to end users. The Company also sells products to end users that use IPG products directly to build their own systems, which incorporate IPG products or use IPG products as an energy or light source. The Company recognizes revenue for laser and spare part sales following the transfer of control of such products to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. Installation revenue is recognized upon completion of the installation service, which typically occurs within 90 days of delivery. For laser systems that carry customer specific processing requirements, revenue is recognized at the latter of customer acceptance date or shipment date if the customer acceptance is made prior to shipment. When sales contracts contain multiple performance obligations, such as the shipment or delivery of products and installation, the Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices and recognizes the related revenue as control of each individual product or service is transferred to the customer, in satisfaction of the corresponding performance obligations. Revenue Recognition over Time — The Company offers extended warranty agreements, which extend the standard warranty periods. Warranties are limited and provide that the product meets specifications and is free from defects in materials and workmanship. Extended warranties are sold separately from products and represent a distinct performance obligation. Revenue related to the performance obligation for extended warranties is recognized over time as the customer simultaneously receives and consumes the benefits provided by the Company. The customer receives the assurance that the product will operate in accordance with agreed-upon specifications evenly during the extended warranty period regardless of whether they make a claim during that period, and therefore, revenue at time of sale is deferred and recognized over the time period of the extended warranty period. Customer Deposits and Deferred Revenue — When the Company receives consideration from a customer or such consideration is unconditionally due prior to transferring goods or services under the terms of a sales contract, the Company records customer deposits or deferred revenue, which represent contract liabilities. The Company recognizes deferred revenue as net sales after control of the goods or services has been transferred to the customer and all revenue recognition criteria are met. RECENT ACCOUNTING PRONOUNCEMENTS Adopted Pronouncements — On January 1, 2018, the Company adopted ASC 606 and all related amendments using the modified retrospective method for contracts that were not completed as of the date of initial application. The Company recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company expects the impact of the adoption of the new standard to be immaterial to net income on an ongoing basis. A majority of revenue continues to be recognized at a point in time when control transfers based on the terms of underlying contact. Under the new revenue standard, the Company will change from deferring revenue for installation services in an amount equal to the greater of the cash received related to installation or the fair value to deferring the standalone selling price for these services. In February 2018, the FASB issued ASU No. 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"). ASU 2018-02 allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act ("the Act"). The Company adopted this standard during the first quarter of 2018, which resulted in the reclassification of $10 related to the tax effect of unrealized gains on derivatives. In October 2016, the FASB issued ASU No. 2016-16, "Income Taxes (Topic 740) - Intra-Entity Transfers of Assets other than Inventory" ("ASU 2016-16"). ASU 2016-16 eliminates the current exception that prohibits the recognition of current and deferred income tax consequences for intra-entity asset transfers (other than inventory) until the asset has been sold to an outside party. The amendments have been applied on a modified retrospective basis through a cumulative effect adjustment to retained earnings. The Company adopted this standard during the first quarter of 2018, which resulted in the reclassification of prepaid income taxes, deferred income taxes and retained earnings. The cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606, ASU 2018-02 and ASU 2016-16 was as follows: Balance at Adoption of Adoption of Adoption of Balance at 12/31/2017 ASC 606 ASU 2018-02 ASU 2016-16 1/1/2018 Balance Sheet Prepaid income taxes $ 44,944 $ — $ — $ (1,203 ) $ 43,741 Deferred income tax assets 26,976 (55 ) — 1,229 28,150 Customer deposits and deferred revenue (short-term) 47,324 (816 ) — — 46,508 Income taxes payable 15,773 37 — — 15,810 Deferred income tax liabilities 21,362 134 — — 21,496 Retained earnings 1,443,867 590 (10 ) 26 1,444,473 Accumulated other comprehensive loss (77,344 ) — 10 — (77,334 ) In January 2017, the FASB issued ASU No. 2017-04, "Intangibles—Goodwill and Other (Topic 350)" ("ASU 2017-04"). ASU 2017-04 simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. The amendments are applied prospectively upon adoption. The Company early adopted this standard during the first quarter of 2018. The Company performs its annual goodwill impairment assessment on October 1st. The new impairment test will be used in the annual assessment or if events or changes in circumstances indicate that the carrying amount may not be recoverable and an impairment analysis is performed. Other Pronouncements Currently Under Evaluation — In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" ("ASU 2016-02"). ASU 2016-02 requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than twelve months. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. The Company is continuing to evaluate the standard but does not expect that it will have a material effect on its consolidated financial statements upon adoption.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Recent Accounting Pronouncements	BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation — The accompanying unaudited consolidated financial statements have been prepared by IPG Photonics Corporation, or "IPG", "its" or the "Company". Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). The consolidated financial statements include the Company's accounts and those of its subsidiaries. All intercompany balances have been eliminated in consolidation. These consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto in the Company's Annual Report on Form 10-K for the year ended December 31, 2017 . In the opinion of the Company's management, the unaudited financial information for the interim periods presented reflects all adjustments necessary for a fair presentation of the Company's financial position, results of operations and cash flows. The results reported in these consolidated financial statements are not necessarily indicative of results that may be expected for the entire year. The Company has evaluated subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC. In accordance with Accounting Standards Codification ("ASC") 606, "Revenue from Contracts with Customers," ("ASC 606" or the "new revenue standard"), the following significant accounting policies have been adopted as of January 1, 2018. Revenue Recognition — Revenue is recognized when transfer of control to the customer occurs in an amount reflecting the consideration that the Company expects to be entitled. In order to achieve this core principle, the Company applies the following five step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when a performance obligation is satisfied. The Company considers customer purchase orders, which in some cases are governed by master sales agreements, to be the contracts with a customer. As part of its consideration of the contract, the Company evaluates certain factors including the customer's ability to pay (or credit risk). For each contract, the Company considers the promise to transfer products, each of which is distinct as the identified performance obligations. In determining the transaction price, the Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the Company expects to be entitled. As the Company's standard payment terms are less than one year, the Company has elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company allocates the transaction price to each distinct product based on its relative standalone selling price. Revenue is recognized when control of the product is transferred to the customer (i.e., when the Company's performance obligation is satisfied), which typically occurs at shipment. The Company often receives orders with multiple delivery dates that may extend across several reporting periods. The Company allocates the transaction price of the contract to each delivery based on the product standalone selling price. The Company invoices for each scheduled delivery upon shipment and recognizes revenues for such delivery at that point, assuming transfer of control has occurred. As scheduled delivery dates are generally within one year, under the optional exemption provided by ASC 606-10-50-14 revenues allocated to future shipments of partially completed contracts are not disclosed. Rights of return generally are not included in customer contracts. Accordingly, upon application of steps one through five above, product revenue is recognized upon shipment and transfer of control. Returns are infrequent and are recorded as a reduction of revenue. In certain subsidiaries the Company provides sales commissions to sales representatives based on sales volume. The Company has determined that the incentive portions of its sales commissions qualify as contract costs. The Company has elected the practical expedient in ASC 340-40-25-4 to expense sales commissions when incurred as the amortization period of the asset that would otherwise have been recognized is one year or less. Revenue Recognition at a Point in Time — Revenues recognized at a point in time consist primarily of product, installation, and service sales. The Company sells products to original equipment manufacturers ("OEMs"), that supply materials processing laser systems, communications systems, medical laser systems and other laser systems for advanced applications to end users. The Company also sells products to end users that use IPG products directly to build their own systems, which incorporate IPG products or use IPG products as an energy or light source. The Company recognizes revenue for laser and spare part sales following the transfer of control of such products to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. Installation revenue is recognized upon completion of the installation service, which typically occurs within 90 days of delivery. For laser systems that carry customer specific processing requirements, revenue is recognized at the latter of customer acceptance date or shipment date if the customer acceptance is made prior to shipment. When sales contracts contain multiple performance obligations, such as the shipment or delivery of products and installation, the Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices and recognizes the related revenue as control of each individual product or service is transferred to the customer, in satisfaction of the corresponding performance obligations. Revenue Recognition over Time — The Company offers extended warranty agreements, which extend the standard warranty periods. Warranties are limited and provide that the product meets specifications and is free from defects in materials and workmanship. Extended warranties are sold separately from products and represent a distinct performance obligation. Revenue related to the performance obligation for extended warranties is recognized over time as the customer simultaneously receives and consumes the benefits provided by the Company. The customer receives the assurance that the product will operate in accordance with agreed-upon specifications evenly during the extended warranty period regardless of whether they make a claim during that period, and therefore, revenue at time of sale is deferred and recognized over the time period of the extended warranty period. Customer Deposits and Deferred Revenue — When the Company receives consideration from a customer or such consideration is unconditionally due prior to transferring goods or services under the terms of a sales contract, the Company records customer deposits or deferred revenue, which represent contract liabilities. The Company recognizes deferred revenue as net sales after control of the goods or services has been transferred to the customer and all revenue recognition criteria are met. RECENT ACCOUNTING PRONOUNCEMENTS Adopted Pronouncements — On January 1, 2018, the Company adopted ASC 606 and all related amendments using the modified retrospective method for contracts that were not completed as of the date of initial application. The Company recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company expects the impact of the adoption of the new standard to be immaterial to net income on an ongoing basis. A majority of revenue continues to be recognized at a point in time when control transfers based on the terms of underlying contact. Under the new revenue standard, the Company will change from deferring revenue for installation services in an amount equal to the greater of the cash received related to installation or the fair value to deferring the standalone selling price for these services. In February 2018, the FASB issued ASU No. 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"). ASU 2018-02 allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act ("the Act"). The Company adopted this standard during the first quarter of 2018, which resulted in the reclassification of $10 related to the tax effect of unrealized gains on derivatives. In October 2016, the FASB issued ASU No. 2016-16, "Income Taxes (Topic 740) - Intra-Entity Transfers of Assets other than Inventory" ("ASU 2016-16"). ASU 2016-16 eliminates the current exception that prohibits the recognition of current and deferred income tax consequences for intra-entity asset transfers (other than inventory) until the asset has been sold to an outside party. The amendments have been applied on a modified retrospective basis through a cumulative effect adjustment to retained earnings. The Company adopted this standard during the first quarter of 2018, which resulted in the reclassification of prepaid income taxes, deferred income taxes and retained earnings. The cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606, ASU 2018-02 and ASU 2016-16 was as follows: Balance at Adoption of Adoption of Adoption of Balance at 12/31/2017 ASC 606 ASU 2018-02 ASU 2016-16 1/1/2018 Balance Sheet Prepaid income taxes $ 44,944 $ — $ — $ (1,203 ) $ 43,741 Deferred income tax assets 26,976 (55 ) — 1,229 28,150 Customer deposits and deferred revenue (short-term) 47,324 (816 ) — — 46,508 Income taxes payable 15,773 37 — — 15,810 Deferred income tax liabilities 21,362 134 — — 21,496 Retained earnings 1,443,867 590 (10 ) 26 1,444,473 Accumulated other comprehensive loss (77,344 ) — 10 — (77,334 ) In January 2017, the FASB issued ASU No. 2017-04, "Intangibles—Goodwill and Other (Topic 350)" ("ASU 2017-04"). ASU 2017-04 simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. The amendments are applied prospectively upon adoption. The Company early adopted this standard during the first quarter of 2018. The Company performs its annual goodwill impairment assessment on October 1st. The new impairment test will be used in the annual assessment or if events or changes in circumstances indicate that the carrying amount may not be recoverable and an impairment analysis is performed. Other Pronouncements Currently Under Evaluation — In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" ("ASU 2016-02"). ASU 2016-02 requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than twelve months. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. The Company is continuing to evaluate the standard but does not expect that it will have a material effect on its consolidated financial statements upon adoption.

Revenue From Contracts With Cus

Revenue From Contracts With Customers	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Revenue From Contracts With Customers	REVENUE FROM CONTRACTS WITH CUSTOMERS The following tables represent a disaggregation of revenue from contracts with customers for the three months ended March 31, 2018 : Sales by Application Materials processing $ 339,214 Other applications 20,650 Total $ 359,864 Sales by Product High Power Continuous Wave ("CW") Lasers $ 230,574 Medium Power CW Lasers 21,470 Low Power CW Lasers 3,929 Pulsed Lasers 38,253 Quasi-Continuous Wave ("QCW") Lasers 16,200 Other Revenue including Amplifiers, Laser Systems, Service, Parts, Accessories and Change in Deferred Revenue 49,438 Total $ 359,864 Sales by Geography United States and other North America $ 39,177 Europe: Germany 33,236 Other including Eastern Europe/CIS 82,978 Asia and Australia: China 149,973 Japan 19,629 Other 34,207 Rest of World 664 Total $ 359,864 Timing of Revenue Recognition Goods and services transferred at a point in time $ 358,852 Services transferred over time 1,012 Total $ 359,864 Before the transition date (under ASC 605, Revenue Recognition ), the Company deferred revenue for installation services in an amount equal to the greater of the cash received or the fair value for installation. Under the new revenue standard, the standalone selling price for installation services is deferred until control has transferred. The standalone selling price for installation services is determined based on the estimated number of days of service technician time required for installation at standard service rates. The impact of applying ASC 606 was an increase in revenue recognized during the three months ended March 31, 2018 of $801 as compared to revenue accounted for under ASC 605. The Company enters into contracts to sell lasers and spare parts, for which revenue is generally recognized upon shipment or delivery, depending on the terms of the contract. The Company also provides installation services and extended warranties. The Company frequently receives consideration from a customer prior to transferring goods to the customer under the terms of a sales contract. The Company records customer deposits related to these prepayments, which represent a contract liability. The Company also records deferred revenue related to installation services when consideration is received before the services have been performed. The Company recognizes customer deposits and deferred revenue as net sales after control of the goods or services has been transferred to the customer and all revenue recognition criteria is met. The Company bills customers for extended warranties upon entering into the agreement with the customer, resulting in deferred revenue. Revenue is recognized ratably over the term of the extended warranty agreement as the customer receives and consumes the benefits of such services. The following table reflects the changes in the Company's contract liabilities for the three months ended March 31, 2018 : March 31, January 1, 2018 2018 Change Contract liabilities Customer deposits 43,234 36,937 6,297 17.0 % Deferred revenue - current 7,107 9,571 (3,280 ) (31.6 )% Deferred revenue - long-term 1,472 182 1,290 708.8 % Customer deposits increased from January 1, 2018 to March 31, 2018 based on seasonality in the Asian market. During the three months ended March 31, 2018 , the Company recognized revenue of $28,332 that was included in the customer deposits and deferred revenue balances at the beginning of the period. The following table represents the Company's remaining performance obligations for sales of installation services and extended warranties and contracts with customer acceptance provisions included in deferred revenue as of March 31, 2018 : Remaining Performance Obligations 2018 2019 2020 2021 2022 2023 Total Revenue expected to be recognized upon customer acceptance $ 4,146 $ — $ — $ — $ — $ — $ 4,146 Revenue expected to be recognized on contracts for installation services 551 — — — — — 551 Revenue expected to be recognized for extended warranty agreements 2,292 894 409 218 62 6 3,882 Total $ 6,989 $ 894 $ 409 $ 218 $ 62 $ 6 $ 8,579

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The Company's financial instruments consist of cash equivalents, short-term investments, accounts receivable, auction rate securities, accounts payable, drawings on revolving lines of credit, long-term debt, contingent purchase consideration and interest rate swap. The valuation techniques used to measure fair value are based upon observable and unobservable inputs. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect internal market assumptions. These two types of inputs create the following fair value hierarchy: Level 1, defined as observable inputs such as quoted prices for identical instruments in active markets; Level 2, defined as inputs other than quoted prices in active markets that are either directly or indirectly observable; and Level 3, defined as unobservable inputs for which little or no market data exists, therefore requiring an entity to develop its own assumptions. The carrying amounts of cash equivalents, short-term investments, accounts receivable, accounts payable and drawings on revolving lines of credit are considered reasonable estimates of their fair market value due to the short maturity of most of these instruments or as a result of the competitive market interest rates, which have been negotiated. At March 31, 2018 and December 31, 2017 , the Company's long-term notes consisted of a variable rate long-term note and a fixed rate long-term note. The book value of the long-term notes approximates the fair market value. The following table presents information about the Company's assets and liabilities measured at fair value: Fair Value Measurements at March 31, 2018 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 462,087 $ 462,087 $ — $ — Short-term investments 206,402 206,402 — — Interest rate swap 18 — 18 — Auction rate securities 1,019 — — 1,019 Total assets $ 669,526 $ 668,489 $ 18 $ 1,019 Liabilities Long-term notes $ 48,087 $ — $ 48,087 $ — Contingent purchase consideration 902 — — 902 Total liabilities $ 48,989 $ — $ 48,087 $ 902 Fair Value Measurements at December 31, 2017 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 425,917 $ 425,917 $ — $ — Short-term investments 206,161 206,161 — — Interest rate swap 16 — 16 — Auction rate securities 1,016 — — 1,016 Total assets $ 633,110 $ 632,078 $ 16 $ 1,016 Liabilities Long-term notes $ 48,982 $ — $ 48,982 $ — Contingent purchase consideration 902 — — 902 Total liabilities $ 49,884 $ — $ 48,982 $ 902 Short-term investments consist of liquid investments including U.S. government and government agency notes, corporate notes, commercial paper and certificates of deposit with original maturities of greater than three months but less than one year and are recorded at amortized cost. The fair value of the short-term investments considered held-to-maturity as of March 31, 2018 and December 31, 2017 was $206,402 and $206,161 , respectively, which represents an unrealized loss of $384 and $96 , respectively, as compared to the book value recorded on the Consolidated Balance Sheets for the same periods. The fair value of the interest rate swap considered pricing models whose inputs are observable for the securities held by the Company. The fair value of the auction rate securities was determined using prices observed in inactive markets with limited observable data for the securities held by the Company. The fair value of contingent purchase consideration was determined using an income approach at the respective business combination date and at the reporting date. That approach is based on significant inputs that are not observable in the market and include key assumptions such as assessing the probability of meeting certain milestones required to earn the contingent purchase consideration. The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value: Three Months Ended March 31, 2018 2017 Auction Rate Securities Balance, beginning of period $ 1,016 $ 1,144 Change in fair value and accretion 3 2 Balance, end of period $ 1,019 $ 1,146 Contingent Purchase Consideration Balance, beginning of period $ 902 $ — Balance, end of period $ 902 $ —

Inventories

Inventories	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: March 31, December 31, 2018 2017 Components and raw materials $ 181,928 $ 145,261 Work-in-process 35,942 43,646 Finished components and devices 138,505 118,805 Total $ 356,375 $ 307,712 The Company recorded inventory provisions totaling $3,357 and $3,971 for the three months ended March 31, 2018 and 2017 , respectively. These provisions relate to the recoverability of the value of inventories due to technological changes and excess quantities. These provisions are reported as a reduction to components and raw materials and finished components and devices.

Goodwill And Intangibles

Goodwill And Intangibles	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	GOODWILL AND INTANGIBLES The following table sets forth the changes in the carrying amount of goodwill for the three months ended March 31, 2018 : Amounts Balance at January 1 $ 55,831 Foreign exchange adjustment (126 ) Balance at March 31 $ 55,705 Intangible assets, subject to amortization, consisted of the following: March 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Patents $ 8,036 $ (5,621 ) $ 2,415 8 Years $ 8,036 $ (5,486 ) $ 2,550 8 Years Customer relationships 26,835 (6,246 ) 20,589 11 Years 26,768 (5,584 ) 21,184 11 Years Production know-how 6,867 (5,274 ) 1,593 8 Years 6,820 (5,035 ) 1,785 8 Years Technology, trademark and tradename 32,628 (7,941 ) 24,687 8 Years 32,564 (6,860 ) 25,704 8 Years $ 74,366 $ (25,082 ) $ 49,284 $ 74,188 $ (22,965 ) $ 51,223 Amortization expense for the three months ended March 31, 2018 and 2017 was $1,931 and $1,065 , respectively. The estimated future amortization expense for intangibles for the remainder of 2018 and subsequent years is as follows: 2018 2019 2020 2021 2022 Thereafter Total $5,514 $7,325 $6,691 $6,515 $5,667 $17,572 $49,284

Accrued Expenses And Other Liab

Accrued Expenses And Other Liabilities	3 Months Ended
	Mar. 31, 2018
Payables and Accruals [Abstract]
Accrued Expenses And Other Liabilities	ACCRUED EXPENSES AND OTHER LIABILITIES Accrued expenses and other liabilities consist of the following: March 31, December 31, 2018 2017 Accrued compensation $ 53,496 $ 63,203 Customer deposits and deferred revenue 50,341 47,324 Current portion of accrued warranty 22,398 25,059 Other 9,515 8,831 Total $ 135,750 $ 144,417

Product Warranties

Product Warranties	3 Months Ended
	Mar. 31, 2018
Product Warranties Disclosures [Abstract]
Product Warranties	PRODUCT WARRANTIES The Company typically provides one to three -year parts and service warranties on lasers and amplifiers. Most of the Company's sales offices provide support to customers in their respective geographic areas. Warranty reserves have generally been sufficient to cover product warranty repair and replacement costs. The following table summarizes product warranty accrual activity recorded during the three months ended March 31, 2018 and 2017 . 2018 2017 Balance at January 1 $ 47,517 $ 33,978 Provision for warranty accrual 5,574 4,523 Warranty claims (3,808 ) (2,966 ) Foreign currency translation 708 438 Balance at March 31 $ 49,991 $ 35,973 Accrued warranty reported in the accompanying consolidated financial statements as of March 31, 2018 and December 31, 2017 consisted of $22,398 and $25,059 in accrued expenses and other liabilities and $27,593 and $22,458 in other long-term liabilities, respectively.

Financing Arrangements

Financing Arrangements	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Financing Arrangements	FINANCING ARRANGEMENTS The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2018 2017 Long-term notes $ 48,087 $ 48,982 Less: current portion (3,621 ) (3,604 ) Total long-term debt $ 44,466 $ 45,378 At March 31, 2018 , the Company has an unsecured long-term note of $21,672 of which $1,188 is the current portion. The interest on this unsecured long-term note is variable at 1.20% above LIBOR and is fixed using an interest rate swap at 2.85% per annum. The unsecured long-term note matures in May 2023, at which time the outstanding principal balance will be $15,438 . Also at March 31, 2018 , the Company has another long-term note that is secured by its corporate aircraft with a outstanding principal balance of $26,415 of which $2,433 is the current portion. The interest on this collateralized long-term note is fixed at 2.74% per annum. The collateralized long-term note matures in July 2022, at which time the outstanding principal balance will be $15,375 . The Company also maintains U.S. and Euro lines-of-credit which are available to certain foreign subsidiaries and allow for borrowings in the local currencies of those subsidiaries. At March 31, 2018 and December 31, 2017 , there were no amounts drawn on the U.S. line-of-credit, and there were $556 and $520 , respectively, of guarantees issued against the facility which reduce the amount of the facility available to draw. At March 31, 2018 and December 31, 2017 , there were no amounts drawn on the Euro lines-of-credit, and there were $798 and $798 , respectively, of guarantees issued against those facilities which reduce the amount available to draw. After providing for the guarantees used the total unused credit lines and overdraft facilities are $112,714 at March 31, 2018 .

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS Derivative instruments – The Company's primary market exposures are to interest rates and foreign exchange rates. The Company from time to time may use certain derivative financial instruments to help manage these exposures. The Company executes these instruments with financial institutions it judges to be credit-worthy. The Company does not hold or issue derivative financial instruments for trading or speculative purposes. The Company recognizes all derivative financial instruments as either assets or liabilities at fair value in the consolidated balance sheets. The Company's only derivative financial instrument is an interest rate swap that is classified as a cash flow hedge of its variable rate debt. The fair value amounts in the consolidated balance sheets were: Notional Amounts 1 Other Assets March 31, December 31, March 31, December 31, 2018 2017 2018 2017 $ 21,672 $ 21,969 $ 18 $ 16 (1) Notional amounts represent the gross contract/notional amount of the derivatives outstanding. The derivative gains and losses in the consolidated statements of income related to the Company's interest rate swap contract was as follows: Three Months Ended March 31, 2018 2017 Effective portion recognized in other comprehensive income, pretax: Interest rate swap $ 2 $ (27 )

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIES From time to time, the Company may be involved in disputes and legal proceedings in the ordinary course of its business. These proceedings may include allegations of infringement of intellectual property, commercial disputes and employment matters. As of March 31, 2018 and through the filing date of these Financial Statements, the Company has no legal proceedings ongoing that management estimates could have a material effect on the Company's Consolidated Financial Statements.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES A reconciliation of the total amounts of unrecognized tax benefits is as follows: 2018 2017 Balance at January 1 $ 10,370 $ 6,403 Additions for tax positions in current period 750 — Balance at March 31 $ 11,120 $ 6,403 Substantially all of the liability for uncertain tax benefits related to various federal, state and foreign income tax matters, would benefit the Company's effective tax rate, if recognized. The Company's accounting for the Tax Act is incomplete in accordance with SAB 118, which provides guidance on accounting for the tax effects of the Tax Act. SAB 118 provides a measurement period that should not extend beyond one year from the Tax Act enactment date for companies to complete the accounting under ASC 740. As noted at year-end, the Company was able to reasonably estimate certain effects and, therefore, recorded provisional adjustments associated with the deemed repatriation transition tax. The Company has not made any additional measurement-period adjustments related to these items during the quarter, however, the Company is continuing to gather additional information to complete its accounting for these items and expects to complete its accounting within the prescribed measurement period. The Company also recognized an incremental tax expense of $4,443 for the Global Intangible Low Taxed Income ("GILTI") provisions which was partially offset by a benefit of $1,154 related to Foreign Derived Intangible Income ("FDII") deduction in the Tax Act that were effective for the first time during 2018.

Net Income Attributable To IPG

Net Income Attributable To IPG Photonics Corporation Per Share	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Attributable To IPG Photonics Corporation Per Share	NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE The following table sets forth the computation of diluted net income attributable to IPG Photonics Corporation per share: Three Months Ended March 31, 2018 2017 Net income attributable to IPG Photonics Corporation $ 106,334 $ 74,945 Weighted average shares 53,694 53,368 Dilutive effect of common stock equivalents 1,488 1,002 Diluted weighted average common shares 55,182 54,370 Basic net income attributable to IPG Photonics Corporation per share $ 1.98 $ 1.40 Diluted net income attributable to IPG Photonics Corporation per share $ 1.93 $ 1.38 For the three months ended March 31, 2018 and 2017 , respectively, the computation of diluted weighted average common shares excludes 101,400 and 73,300 common stock equivalents because the effect of including them would be anti-dilutive. The shares excluded for the three months ended March 31, 2018 and 2017 , respectively, are comprised of 32,600 and 44,400 RSUs, 59,600 and 11,800 non-qualified stock options and 9,200 and 17,100 performance stock units. On July 28, 2016, the Company announced that its Board of Directors authorized a share repurchase program (the “Program”) to mitigate the dilutive impact of shares issued upon exercise or release under the Company's various employee and director equity compensation and employee stock purchase plans. Under the Program, the Company's management is authorized to repurchase shares of common stock in an amount not to exceed the number of shares issued to employees and directors under its various employee and director equity compensation and employee stock purchase plans from January 1, 2016 through December 31, 2017. The Program limits aggregate share repurchases to no more than $100,000 over a period ending June 30, 2018. For the three months ended March 31, 2018 , the Company repurchased 82,898 shares of its common stock with an average price of $242.11 per share in the open market. The impact on the reduction of weighted average shares for the three months ended March 31, 2018 and 2017 was 28,172 shares and 31,140 shares, respectively.

Recent Accounting Pronounceme21

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation — The accompanying unaudited consolidated financial statements have been prepared by IPG Photonics Corporation, or "IPG", "its" or the "Company". Certain information and footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America have been condensed or omitted pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). The consolidated financial statements include the Company's accounts and those of its subsidiaries. All intercompany balances have been eliminated in consolidation.
Revenue Recognition	Revenue Recognition — Revenue is recognized when transfer of control to the customer occurs in an amount reflecting the consideration that the Company expects to be entitled. In order to achieve this core principle, the Company applies the following five step approach: (1) identify the contract with a customer, (2) identify the performance obligations in the contract, (3) determine the transaction price, (4) allocate the transaction price to the performance obligations in the contract, and (5) recognize revenue when a performance obligation is satisfied. The Company considers customer purchase orders, which in some cases are governed by master sales agreements, to be the contracts with a customer. As part of its consideration of the contract, the Company evaluates certain factors including the customer's ability to pay (or credit risk). For each contract, the Company considers the promise to transfer products, each of which is distinct as the identified performance obligations. In determining the transaction price, the Company evaluates whether the price is subject to refund or adjustment to determine the net consideration to which the Company expects to be entitled. As the Company's standard payment terms are less than one year, the Company has elected the practical expedient under ASC 606-10-32-18 to not assess whether a contract has a significant financing component. The Company allocates the transaction price to each distinct product based on its relative standalone selling price. Revenue is recognized when control of the product is transferred to the customer (i.e., when the Company's performance obligation is satisfied), which typically occurs at shipment. The Company often receives orders with multiple delivery dates that may extend across several reporting periods. The Company allocates the transaction price of the contract to each delivery based on the product standalone selling price. The Company invoices for each scheduled delivery upon shipment and recognizes revenues for such delivery at that point, assuming transfer of control has occurred. As scheduled delivery dates are generally within one year, under the optional exemption provided by ASC 606-10-50-14 revenues allocated to future shipments of partially completed contracts are not disclosed. Rights of return generally are not included in customer contracts. Accordingly, upon application of steps one through five above, product revenue is recognized upon shipment and transfer of control. Returns are infrequent and are recorded as a reduction of revenue. In certain subsidiaries the Company provides sales commissions to sales representatives based on sales volume. The Company has determined that the incentive portions of its sales commissions qualify as contract costs. The Company has elected the practical expedient in ASC 340-40-25-4 to expense sales commissions when incurred as the amortization period of the asset that would otherwise have been recognized is one year or less. Revenue Recognition at a Point in Time — Revenues recognized at a point in time consist primarily of product, installation, and service sales. The Company sells products to original equipment manufacturers ("OEMs"), that supply materials processing laser systems, communications systems, medical laser systems and other laser systems for advanced applications to end users. The Company also sells products to end users that use IPG products directly to build their own systems, which incorporate IPG products or use IPG products as an energy or light source. The Company recognizes revenue for laser and spare part sales following the transfer of control of such products to the customer, which typically occurs upon shipment or delivery depending on the terms of the underlying contracts. Installation revenue is recognized upon completion of the installation service, which typically occurs within 90 days of delivery. For laser systems that carry customer specific processing requirements, revenue is recognized at the latter of customer acceptance date or shipment date if the customer acceptance is made prior to shipment. When sales contracts contain multiple performance obligations, such as the shipment or delivery of products and installation, the Company allocates the transaction price to each performance obligation identified in the contract based on relative standalone selling prices and recognizes the related revenue as control of each individual product or service is transferred to the customer, in satisfaction of the corresponding performance obligations. Revenue Recognition over Time — The Company offers extended warranty agreements, which extend the standard warranty periods. Warranties are limited and provide that the product meets specifications and is free from defects in materials and workmanship. Extended warranties are sold separately from products and represent a distinct performance obligation. Revenue related to the performance obligation for extended warranties is recognized over time as the customer simultaneously receives and consumes the benefits provided by the Company. The customer receives the assurance that the product will operate in accordance with agreed-upon specifications evenly during the extended warranty period regardless of whether they make a claim during that period, and therefore, revenue at time of sale is deferred and recognized over the time period of the extended warranty period.
Customer Deposits and Deferred Revenue	Customer Deposits and Deferred Revenue — When the Company receives consideration from a customer or such consideration is unconditionally due prior to transferring goods or services under the terms of a sales contract, the Company records customer deposits or deferred revenue, which represent contract liabilities. The Company recognizes deferred revenue as net sales after control of the goods or services has been transferred to the customer and all revenue recognition criteria are met.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS Adopted Pronouncements — On January 1, 2018, the Company adopted ASC 606 and all related amendments using the modified retrospective method for contracts that were not completed as of the date of initial application. The Company recognized the cumulative effect of initially applying the new revenue standard as an adjustment to the opening balance of retained earnings. The comparative information has not been restated and continues to be reported under the accounting standards in effect for those periods. The Company expects the impact of the adoption of the new standard to be immaterial to net income on an ongoing basis. A majority of revenue continues to be recognized at a point in time when control transfers based on the terms of underlying contact. Under the new revenue standard, the Company will change from deferring revenue for installation services in an amount equal to the greater of the cash received related to installation or the fair value to deferring the standalone selling price for these services. In February 2018, the FASB issued ASU No. 2018-02, "Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income" ("ASU 2018-02"). ASU 2018-02 allows a reclassification from accumulated other comprehensive income to retained earnings for stranded tax effects resulting from the Tax Cuts and Jobs Act ("the Act"). The Company adopted this standard during the first quarter of 2018, which resulted in the reclassification of $10 related to the tax effect of unrealized gains on derivatives. In October 2016, the FASB issued ASU No. 2016-16, "Income Taxes (Topic 740) - Intra-Entity Transfers of Assets other than Inventory" ("ASU 2016-16"). ASU 2016-16 eliminates the current exception that prohibits the recognition of current and deferred income tax consequences for intra-entity asset transfers (other than inventory) until the asset has been sold to an outside party. The amendments have been applied on a modified retrospective basis through a cumulative effect adjustment to retained earnings. The Company adopted this standard during the first quarter of 2018, which resulted in the reclassification of prepaid income taxes, deferred income taxes and retained earnings. The cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606, ASU 2018-02 and ASU 2016-16 was as follows: Balance at Adoption of Adoption of Adoption of Balance at 12/31/2017 ASC 606 ASU 2018-02 ASU 2016-16 1/1/2018 Balance Sheet Prepaid income taxes $ 44,944 $ — $ — $ (1,203 ) $ 43,741 Deferred income tax assets 26,976 (55 ) — 1,229 28,150 Customer deposits and deferred revenue (short-term) 47,324 (816 ) — — 46,508 Income taxes payable 15,773 37 — — 15,810 Deferred income tax liabilities 21,362 134 — — 21,496 Retained earnings 1,443,867 590 (10 ) 26 1,444,473 Accumulated other comprehensive loss (77,344 ) — 10 — (77,334 ) In January 2017, the FASB issued ASU No. 2017-04, "Intangibles—Goodwill and Other (Topic 350)" ("ASU 2017-04"). ASU 2017-04 simplifies the accounting for goodwill impairments by eliminating step 2 from the goodwill impairment test. The amendments are applied prospectively upon adoption. The Company early adopted this standard during the first quarter of 2018. The Company performs its annual goodwill impairment assessment on October 1st. The new impairment test will be used in the annual assessment or if events or changes in circumstances indicate that the carrying amount may not be recoverable and an impairment analysis is performed. Other Pronouncements Currently Under Evaluation — In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" ("ASU 2016-02"). ASU 2016-02 requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than twelve months. ASU 2016-02 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2018, and early adoption is permitted. The Company is continuing to evaluate the standard but does not expect that it will have a material effect on its consolidated financial statements upon adoption.

Recent Accounting Pronounceme22

Recent Accounting Pronouncements (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Cumulative Effect of Change to Balance Sheet	The cumulative effect of the changes made to the Company's consolidated January 1, 2018 balance sheet for the adoption of ASC 606, ASU 2018-02 and ASU 2016-16 was as follows: Balance at Adoption of Adoption of Adoption of Balance at 12/31/2017 ASC 606 ASU 2018-02 ASU 2016-16 1/1/2018 Balance Sheet Prepaid income taxes $ 44,944 $ — $ — $ (1,203 ) $ 43,741 Deferred income tax assets 26,976 (55 ) — 1,229 28,150 Customer deposits and deferred revenue (short-term) 47,324 (816 ) — — 46,508 Income taxes payable 15,773 37 — — 15,810 Deferred income tax liabilities 21,362 134 — — 21,496 Retained earnings 1,443,867 590 (10 ) 26 1,444,473 Accumulated other comprehensive loss (77,344 ) — 10 — (77,334 )

Revenue From Contracts With C23

Revenue From Contracts With Customers (Tables)	3 Months Ended
	Mar. 31, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables represent a disaggregation of revenue from contracts with customers for the three months ended March 31, 2018 : Sales by Application Materials processing $ 339,214 Other applications 20,650 Total $ 359,864 Sales by Product High Power Continuous Wave ("CW") Lasers $ 230,574 Medium Power CW Lasers 21,470 Low Power CW Lasers 3,929 Pulsed Lasers 38,253 Quasi-Continuous Wave ("QCW") Lasers 16,200 Other Revenue including Amplifiers, Laser Systems, Service, Parts, Accessories and Change in Deferred Revenue 49,438 Total $ 359,864 Sales by Geography United States and other North America $ 39,177 Europe: Germany 33,236 Other including Eastern Europe/CIS 82,978 Asia and Australia: China 149,973 Japan 19,629 Other 34,207 Rest of World 664 Total $ 359,864 Timing of Revenue Recognition Goods and services transferred at a point in time $ 358,852 Services transferred over time 1,012 Total $ 359,864
Changes in Contract Liabilities	The following table reflects the changes in the Company's contract liabilities for the three months ended March 31, 2018 : March 31, January 1, 2018 2018 Change Contract liabilities Customer deposits 43,234 36,937 6,297 17.0 % Deferred revenue - current 7,107 9,571 (3,280 ) (31.6 )% Deferred revenue - long-term 1,472 182 1,290 708.8 %
Schedule of Remaining Performance Obligations	The following table represents the Company's remaining performance obligations for sales of installation services and extended warranties and contracts with customer acceptance provisions included in deferred revenue as of March 31, 2018 : Remaining Performance Obligations 2018 2019 2020 2021 2022 2023 Total Revenue expected to be recognized upon customer acceptance $ 4,146 $ — $ — $ — $ — $ — $ 4,146 Revenue expected to be recognized on contracts for installation services 551 — — — — — 551 Revenue expected to be recognized for extended warranty agreements 2,292 894 409 218 62 6 3,882 Total $ 6,989 $ 894 $ 409 $ 218 $ 62 $ 6 $ 8,579

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Assets And Liabilities Measured At Fair Value	The following table presents information about the Company's assets and liabilities measured at fair value: Fair Value Measurements at March 31, 2018 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 462,087 $ 462,087 $ — $ — Short-term investments 206,402 206,402 — — Interest rate swap 18 — 18 — Auction rate securities 1,019 — — 1,019 Total assets $ 669,526 $ 668,489 $ 18 $ 1,019 Liabilities Long-term notes $ 48,087 $ — $ 48,087 $ — Contingent purchase consideration 902 — — 902 Total liabilities $ 48,989 $ — $ 48,087 $ 902 Fair Value Measurements at December 31, 2017 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 425,917 $ 425,917 $ — $ — Short-term investments 206,161 206,161 — — Interest rate swap 16 — 16 — Auction rate securities 1,016 — — 1,016 Total assets $ 633,110 $ 632,078 $ 16 $ 1,016 Liabilities Long-term notes $ 48,982 $ — $ 48,982 $ — Contingent purchase consideration 902 — — 902 Total liabilities $ 49,884 $ — $ 48,982 $ 902
Fair Value, Assets Measured on Recurring Basis	The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value: Three Months Ended March 31, 2018 2017 Auction Rate Securities Balance, beginning of period $ 1,016 $ 1,144 Change in fair value and accretion 3 2 Balance, end of period $ 1,019 $ 1,146 Contingent Purchase Consideration Balance, beginning of period $ 902 $ — Balance, end of period $ 902 $ —
Fair Value, Liabilities Measured on Recurring Basis	The following table presents information about the Company's movement in Level 3 assets and liabilities measured at fair value: Three Months Ended March 31, 2018 2017 Auction Rate Securities Balance, beginning of period $ 1,016 $ 1,144 Change in fair value and accretion 3 2 Balance, end of period $ 1,019 $ 1,146 Contingent Purchase Consideration Balance, beginning of period $ 902 $ — Balance, end of period $ 902 $ —

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2018
Inventory Disclosure [Abstract]
Components of Inventories	Inventories consist of the following: March 31, December 31, 2018 2017 Components and raw materials $ 181,928 $ 145,261 Work-in-process 35,942 43,646 Finished components and devices 138,505 118,805 Total $ 356,375 $ 307,712

Goodwill And Intangibles (Table

Goodwill And Intangibles (Tables)	3 Months Ended
	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table sets forth the changes in the carrying amount of goodwill for the three months ended March 31, 2018 : Amounts Balance at January 1 $ 55,831 Foreign exchange adjustment (126 ) Balance at March 31 $ 55,705
Schedule of Intangible Assets	Intangible assets, subject to amortization, consisted of the following: March 31, 2018 December 31, 2017 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Patents $ 8,036 $ (5,621 ) $ 2,415 8 Years $ 8,036 $ (5,486 ) $ 2,550 8 Years Customer relationships 26,835 (6,246 ) 20,589 11 Years 26,768 (5,584 ) 21,184 11 Years Production know-how 6,867 (5,274 ) 1,593 8 Years 6,820 (5,035 ) 1,785 8 Years Technology, trademark and tradename 32,628 (7,941 ) 24,687 8 Years 32,564 (6,860 ) 25,704 8 Years $ 74,366 $ (25,082 ) $ 49,284 $ 74,188 $ (22,965 ) $ 51,223
Estimated Future Amortization Expense For Intangibles	The estimated future amortization expense for intangibles for the remainder of 2018 and subsequent years is as follows: 2018 2019 2020 2021 2022 Thereafter Total $5,514 $7,325 $6,691 $6,515 $5,667 $17,572 $49,284

Accrued Expenses And Other Li27

Accrued Expenses And Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2018
Payables and Accruals [Abstract]
Components of Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consist of the following: March 31, December 31, 2018 2017 Accrued compensation $ 53,496 $ 63,203 Customer deposits and deferred revenue 50,341 47,324 Current portion of accrued warranty 22,398 25,059 Other 9,515 8,831 Total $ 135,750 $ 144,417

Product Warranties (Tables)

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2018
Product Warranties Disclosures [Abstract]
Summary of Product Warranty Activity	The following table summarizes product warranty accrual activity recorded during the three months ended March 31, 2018 and 2017 . 2018 2017 Balance at January 1 $ 47,517 $ 33,978 Provision for warranty accrual 5,574 4,523 Warranty claims (3,808 ) (2,966 ) Foreign currency translation 708 438 Balance at March 31 $ 49,991 $ 35,973

Financing Arrangements (Tables)

Financing Arrangements (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Borrowings Under Existing Financing Arrangements	The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2018 2017 Long-term notes $ 48,087 $ 48,982 Less: current portion (3,621 ) (3,604 ) Total long-term debt $ 44,466 $ 45,378

Derivative Financial Instrume30

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Cash Flow Hedges	The fair value amounts in the consolidated balance sheets were: Notional Amounts 1 Other Assets March 31, December 31, March 31, December 31, 2018 2017 2018 2017 $ 21,672 $ 21,969 $ 18 $ 16 (1) Notional amounts represent the gross contract/notional amount of the derivatives outstanding.
Derivative Gains (Losses) In The Consolidated Statements Of Income Related To Interest Rate Swap Contracts	The derivative gains and losses in the consolidated statements of income related to the Company's interest rate swap contract was as follows: Three Months Ended March 31, 2018 2017 Effective portion recognized in other comprehensive income, pretax: Interest rate swap $ 2 $ (27 )

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Schedule of Unrecognized Tax Benefits	A reconciliation of the total amounts of unrecognized tax benefits is as follows: 2018 2017 Balance at January 1 $ 10,370 $ 6,403 Additions for tax positions in current period 750 — Balance at March 31 $ 11,120 $ 6,403

Net Income Attributable To IP32

Net Income Attributable To IPG Photonics Corporation Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Computation of Diluted Net Income Per Share	The following table sets forth the computation of diluted net income attributable to IPG Photonics Corporation per share: Three Months Ended March 31, 2018 2017 Net income attributable to IPG Photonics Corporation $ 106,334 $ 74,945 Weighted average shares 53,694 53,368 Dilutive effect of common stock equivalents 1,488 1,002 Diluted weighted average common shares 55,182 54,370 Basic net income attributable to IPG Photonics Corporation per share $ 1.98 $ 1.40 Diluted net income attributable to IPG Photonics Corporation per share $ 1.93 $ 1.38

Basis Of Presentation And Sig33

Basis Of Presentation And Significant Accounting Policies (Narrative) (Details)	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Scheduled delivery dates, period (within)	1 year
Installation services, completion period	90 days

Recent Accounting Pronounceme34

Recent Accounting Pronouncements (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
ASU 2018-02 | New Accounting Pronouncement, Early Adoption, Effect
New Accounting Pronouncement, Early Adoption [Line Items]
Reclassification from AOCI to retained earnings, Tax Cuts and Jobs Act of 2017	$ 10

Recent Accounting Pronounceme35

Recent Accounting Pronouncements (Cumulative Effect of Change to Balance Sheet) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid income taxes	$ 42,430	$ 43,741	$ 44,944
Deferred income tax assets	24,940	28,150	26,976
Customer deposits and deferred revenue (short-term)		46,508
Income taxes payable	22,820	15,810	15,773
Deferred income tax liabilities		21,496
Retained earnings	1,550,807	1,444,473	1,443,867
Accumulated other comprehensive loss	$ (50,694)	(77,334)	(77,344)
Before Adoption of Standard
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid income taxes			44,944
Deferred income tax assets			26,976
Customer deposits and deferred revenue (short-term)			47,324
Income taxes payable			15,773
Deferred income tax liabilities			21,362
Retained earnings			1,443,867
Accumulated other comprehensive loss			$ (77,344)
Adoption of Standard | ASC 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred income tax assets		(55)
Customer deposits and deferred revenue (short-term)		(816)
Income taxes payable		37
Deferred income tax liabilities		134
Retained earnings		590
Adoption of Standard | ASU 2018-02
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings		(10)
Accumulated other comprehensive loss		10
Adoption of Standard | ASU 2016-16
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Prepaid income taxes		(1,203)
Deferred income tax assets		1,229
Retained earnings		$ 26

Revenue From Contracts With C36

Revenue From Contracts With Customers (Disaggregation of Revenue, By Application) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Sales by Application
Total	$ 359,864
Materials processing
Sales by Application
Total	339,214
Other applications
Sales by Application
Total	$ 20,650

Revenue From Contract With Cust

Revenue From Contract With Customers (Disaggregation of Revenue, By Product) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Disaggregation of Revenue [Line Items]
Total	$ 359,864
High Power Continuous Wave (CW) Lasers
Disaggregation of Revenue [Line Items]
Total	230,574
Medium Power CW Lasers
Disaggregation of Revenue [Line Items]
Total	21,470
Low Power CW Lasers
Disaggregation of Revenue [Line Items]
Total	3,929
Pulsed Lasers
Disaggregation of Revenue [Line Items]
Total	38,253
Quasi-Continuous Wave (QCW) Lasers
Disaggregation of Revenue [Line Items]
Total	16,200
Other Revenue including Amplifiers, Laser Systems, Service, Parts, Accessories and Change in Deferred Revenue
Disaggregation of Revenue [Line Items]
Total	$ 49,438

Revenue From Contracts With C38

Revenue From Contracts With Customers (Disaggregation of Revenue, By Geography) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Sales by Geography
Total	$ 359,864
United States and other North America
Sales by Geography
Total	39,177
Germany
Sales by Geography
Total	33,236
Other including Eastern Europe/CIS
Sales by Geography
Total	82,978
China
Sales by Geography
Total	149,973
Japan
Sales by Geography
Total	19,629
Other
Sales by Geography
Total	34,207
Rest of World
Sales by Geography
Total	$ 664

Revenue From Contracts With C39

Revenue From Contracts With Customers (Disaggregation of Revenue, By Timing) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Timing of Revenue Recognition
Total	$ 359,864
Goods and services transferred at a point in time
Timing of Revenue Recognition
Total	358,852
Services transferred over time
Timing of Revenue Recognition
Total	$ 1,012

Revenue From Contracts With C40

Revenue From Contracts With Customers (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Disaggregation of Revenue [Line Items]
Total	$ 359,864
Revenue recognized that was included in the contract liability balance at the beginning of the period	28,332
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC 606
Disaggregation of Revenue [Line Items]
Total	$ 801

Revenue From Contracts With C41

Revenue From Contracts With Customers (Changes in Contract Assets and Contract Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018
Contract liabilities
Customer deposits	$ 43,234
Deferred revenue - current	7,107
Deferred revenue - long-term	$ 1,472
Calculated under Revenue Guidance in Effect before Topic 606
Contract liabilities
Customer deposits		$ 36,937
Deferred revenue - current		9,571
Deferred revenue - long-term		182
Difference between Revenue Guidance in Effect before and after Topic 606 | ASC 606
Contract liabilities
Customer deposits		$ 6,297
Customer deposits, Change		17.00%
Deferred revenue - current		$ (3,280)
Deferred revenue - current, Change		(31.60%)
Deferred revenue - long-term		$ 1,290
Deferred revenue - long-term, Change		708.80%

Revenue From Contracts With C42

Revenue From Contracts With Customer (Schedule of Remaining Performance Obligations) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 6,989
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01 | Revenue expected to be recognized upon customer acceptance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 4,146
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01 | Revenue expected to be recognized on contracts for installation services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 551
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 2,292
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 894
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 | Revenue expected to be recognized upon customer acceptance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 | Revenue expected to be recognized on contracts for installation services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 894
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 409
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01 | Revenue expected to be recognized upon customer acceptance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01 | Revenue expected to be recognized on contracts for installation services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 409
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 218
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Revenue expected to be recognized upon customer acceptance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Revenue expected to be recognized on contracts for installation services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 218
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 62
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 | Revenue expected to be recognized upon customer acceptance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 | Revenue expected to be recognized on contracts for installation services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 62
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 | Revenue expected to be recognized upon customer acceptance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 | Revenue expected to be recognized on contracts for installation services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 0
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 6
Remaining Performance Obligations, Expected Timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 8,579
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) | Revenue expected to be recognized upon customer acceptance
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	4,146
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) | Revenue expected to be recognized on contracts for installation services
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	551
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil) | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining Performance Obligations	$ 3,882

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 669,526	$ 633,110
Liabilities	48,989	49,884
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	462,087	425,917
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	206,402	206,161
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	18	16
Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,019	1,016
Long-term notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	48,087	48,982
Contingent purchase consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	902	902
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	668,489	632,078
Liabilities	0	0
Level 1 | Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	462,087	425,917
Level 1 | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	206,402	206,161
Level 1 | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 1 | Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 1 | Long-term notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Level 1 | Contingent purchase consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	18	16
Liabilities	48,087	48,982
Level 2 | Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 2 | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 2 | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	18	16
Level 2 | Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 2 | Long-term notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	48,087	48,982
Level 2 | Contingent purchase consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,019	1,016
Liabilities	902	902
Level 3 | Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 3 | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 3 | Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Level 3 | Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,019	1,016
Level 3 | Long-term notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Level 3 | Contingent purchase consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	$ 902	$ 902

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value short-term investments	$ 669,526	$ 633,110
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value short-term investments	206,402	206,161
Held-to-maturity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss, short-term investments	384	96
Held-to-maturity Securities | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value short-term investments	$ 206,402	$ 206,161

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value of Auction Rate Securities and Contingent Purchase Consideration) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 1,016	$ 1,144
Change in fair value and accretion	3	2
Balance, end of period	1,019	1,146
Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	902	0
Balance, end of period	$ 902	$ 0

Inventories (Components Of Inve

Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Components and raw materials	$ 181,928	$ 145,261
Work-in-process	35,942	43,646
Finished components and devices	138,505	118,805
Total	$ 356,375	$ 307,712

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Inventory Disclosure [Abstract]
Inventory provisions	$ 3,357	$ 3,971

Goodwill And Intangibles (Sched

Goodwill And Intangibles (Schedule of Changes) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Goodwill [Roll Forward]
Balance at January 1	$ 55,831
Foreign exchange adjustment	(126)
Balance at March 31	$ 55,705

Goodwill And Intangibles (Intan

Goodwill And Intangibles (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 74,366	$ 74,188
Accumulated Amortization	(25,082)	(22,965)
Net Carrying Amount	49,284	51,223
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,036	8,036
Accumulated Amortization	(5,621)	(5,486)
Net Carrying Amount	$ 2,415	$ 2,550
Weighted- Average Lives	8 years	8 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 26,835	$ 26,768
Accumulated Amortization	(6,246)	(5,584)
Net Carrying Amount	$ 20,589	$ 21,184
Weighted- Average Lives	11 years	11 years
Production know-how
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,867	$ 6,820
Accumulated Amortization	(5,274)	(5,035)
Net Carrying Amount	$ 1,593	$ 1,785
Weighted- Average Lives	8 years	8 years
Technology, trademark and tradename
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 32,628	$ 32,564
Accumulated Amortization	(7,941)	(6,860)
Net Carrying Amount	$ 24,687	$ 25,704
Weighted- Average Lives	8 years	8 years

Goodwill And Intangibles (Narra

Goodwill And Intangibles (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,931	$ 1,065

Goodwill And Intangibles (Estim

Goodwill And Intangibles (Estimated Future Amortization Expense For Intangibles) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
2,018	$ 5,514
2,019	7,325
2,020	6,691
2,021	6,515
2,022	5,667
Thereafter	17,572
Net Carrying Amount	$ 49,284	$ 51,223

Accrued Expenses And Other Li52

Accrued Expenses And Other Liabilities (Components Of Accrued Expenses And Other Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued compensation	$ 53,496	$ 63,203
Customer deposits and deferred revenue	50,341	47,324
Current portion of accrued warranty	22,398	25,059
Other	9,515	8,831
Total	$ 135,750	$ 144,417

Product Warranties (Narrative)

Product Warranties (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Product Warranty Liability [Line Items]
Accrued warranty reported in accrued expenses and other liabilities	$ 22,398	$ 25,059
Accrued warranty reported in other long-term liabilities	$ 27,593	$ 22,458
Minimum
Product Warranty Liability [Line Items]
Service warranties on lasers and amplifiers	1 year
Maximum
Product Warranty Liability [Line Items]
Service warranties on lasers and amplifiers	3 years

Product Warranties (Summary Of

Product Warranties (Summary Of Product Warranty Activity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 47,517	$ 33,978
Provision for warranty accrual	5,574	4,523
Warranty claims	(3,808)	(2,966)
Foreign currency translation	708	438
Balance at March 31	$ 49,991	$ 35,973

Financing Arrangements (Borrowi

Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Less: current portion	$ (3,621)	$ (3,604)
Total long-term debt	44,466	45,378
Long-term notes
Debt Instrument [Line Items]
Long-term notes	48,087	48,982
Less: current portion	$ (3,621)	$ (3,604)

Financing Arrangements (Narrati

Financing Arrangements (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	May 31, 2023	Jul. 31, 2022	Dec. 31, 2017
Debt Instrument [Line Items]
Total unused credit lines and overdraft facilities	$ 112,714,000
Unsecured Debt | Scenario, Forecast
Debt Instrument [Line Items]
Amount due on long-term note		$ 15,438,000
Unsecured Debt | Interest rate swap
Debt Instrument [Line Items]
Fixed interest rate swap	2.85%
Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Variable interest rate	1.20%
Secured Debt
Debt Instrument [Line Items]
Amount due on long-term note	$ 26,415,000
Current portion of long-term note	$ 2,433,000
Fixed interest rate	2.74%
Secured Debt | Scenario, Forecast
Debt Instrument [Line Items]
Amount due on long-term note			$ 15,375,000
Long-term notes | Unsecured Debt
Debt Instrument [Line Items]
Amount due on long-term note	$ 21,672,000
Current portion of long-term note	1,188,000
U.S. line-of-credit
Debt Instrument [Line Items]
Line of credit	0			$ 0
Guarantees issued	556,000			520,000
Euro line-of-credit
Debt Instrument [Line Items]
Line of credit	0			0
Guarantees issued	$ 798,000			$ 798,000

Derivative Financial Instrume57

Derivative Financial Instruments (Fair Value Of Cash Flow Hedges) (Details) - Interest rate swap - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Notional amounts	$ 21,672	$ 21,969
Other Assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 18	$ 16

Derivative Financial Instrume58

Derivative Financial Instruments (Derivative Gains (Losses) In The Consolidated Statements Of Income Related To Interest Rate Swap Contracts) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion recognized in other comprehensive income, pretax	$ 2	$ (27)

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details)	Mar. 31, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
Legal proceedings	$ 0

Income Taxes (Schedule of Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 10,370	$ 6,403
Additions for tax positions in current period	750	0
Balance at March 31	$ 11,120	$ 6,403

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Contingency [Line Items]
Tax expense, global intangible low taxed income	$ 35,520	$ 26,328
Foreign Tax Authority
Income Tax Contingency [Line Items]
Tax expense, global intangible low taxed income	4,443
Tax benefit, foreign derived intangible income	$ 1,154

Net Income Attributable To IP62

Net Income Attributable To IPG Photonics Corporation Per Share (Computation of Diluted Net Income) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to IPG Photonics Corporation	$ 106,334	$ 74,945
Weighted average shares (in shares)	53,694	53,368
Dilutive effect of common stock equivalents (in shares)	1,488	1,002
Diluted weighted average common shares (in shares)	55,182	54,370
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.98	$ 1.40
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.93	$ 1.38

Net Income Attributable to IP63

Net Income Attributable to IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jul. 28, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	101,400	73,300
Share repurchase amount (no more than)			$ 100,000
Stock repurchased during period (in shares)	82,898
Stock repurchase average price (in dollars per share)	$ 242.11
Decrease in weighted average shares outstanding, treasury stock (in shares)	28,172	31,140
Restricted Stock Units, RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	32,600	44,400
Stock Options | Non-qualified Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	59,600	11,800
Performance Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	9,200	17,100