IPG Photonics (IPGP) 10-Q 8 May 17 2017 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2017	May 03, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2017
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2,017
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)		53,681,885

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
CURRENT ASSETS:
Cash and cash equivalents	$ 697,778	$ 623,855
Short-term investments	165,025	206,779
Accounts receivable, net	180,226	155,901
Inventories	261,893	239,010
Prepaid income taxes	41,959	34,128
Prepaid expenses and other current assets	44,133	41,289
Total current assets	1,391,014	1,300,962
DEFERRED INCOME TAXES, NET	47,048	42,442
GOODWILL	19,831	19,828
INTANGIBLE ASSETS, NET	27,892	28,789
PROPERTY, PLANT AND EQUIPMENT, NET	395,858	379,375
OTHER ASSETS	20,930	18,603
TOTAL	1,902,573	1,789,999
CURRENT LIABILITIES:
Current portion of long-term debt	3,188	3,188
Accounts payable	25,388	28,048
Accrued expenses and other liabilities	105,737	102,485
Income taxes payable	23,423	24,554
Total current liabilities	157,736	158,275
DEFERRED INCOME TAXES AND OTHER LONG-TERM LIABILITIES	41,726	36,365
LONG-TERM DEBT, NET OF CURRENT PORTION	36,839	37,635
Total liabilities	236,301	232,275
COMMITMENTS AND CONTINGENCIES (NOTE 12)
IPG PHOTONICS CORPORATION EQUITY:
Common stock, $0.0001 par value, 175,000,000 shares authorized; 53,636,419 and 53,425,945 shares issued and outstanding, respectively, at March 31, 2017; 53,354,579 and 53,251,805 shares issued and outstanding, respectively, at December 31, 2016	5	5
Treasury stock, at cost (210,474 and 102,774 shares held)	(21,485)	(8,946)
Additional paid-in capital	668,003	650,974
Retained earnings	1,171,198	1,094,108
Accumulated other comprehensive loss	(151,626)	(178,583)
Total IPG Photonics Corporation equity	1,666,095	1,557,558
NONCONTROLLING INTERESTS	177	166
Total equity	1,666,272	1,557,724
TOTAL	$ 1,902,573	$ 1,789,999

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
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)	53,636,419	53,354,579
Common stock, shares outstanding (in shares)	53,425,945	53,251,805
Treasury stock, shares (in shares)	210,474	102,774

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
NET SALES	$ 285,846	$ 207,248
COST OF SALES	128,579	92,838
GROSS PROFIT	157,267	114,410
OPERATING EXPENSES:
Sales and marketing	10,827	8,034
Research and development	22,780	17,489
General and administrative	17,726	13,901
Loss on foreign exchange	4,453	4,967
Total operating expenses	55,786	44,391
OPERATING INCOME	101,481	70,019
OTHER (EXPENSE) INCOME, Net:
Interest income, net	308	192
Other (expense) income, net	(529)	7
Total other (expense) income	(221)	199
INCOME BEFORE PROVISION FOR INCOME TAXES	101,260	70,218
PROVISION FOR INCOME TAXES	(26,328)	(20,890)
NET INCOME	74,932	49,328
LESS: NET (LOSS) INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(13)	2
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION	$ 74,945	$ 49,326
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE:
Basic (in dollars per share)	$ 1.40	$ 0.93
Diluted (in dollars per share)	$ 1.38	$ 0.92
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	53,368	52,898
Diluted (in shares)	54,370	53,621

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 74,932	$ 49,328
Other comprehensive income, net of tax:
Translation adjustments	26,699	28,495
Unrealized loss on derivatives	(16)	0
Loss on available-for-sale investments, net of tax reclassified to net income	298	0
Total other comprehensive loss	26,981	28,495
Comprehensive income	101,913	77,823
Comprehensive income attributable to noncontrolling interest	11	5
Comprehensive income attributable to IPG Photonics Corporation	$ 101,902	$ 77,818

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 74,932	$ 49,328
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	14,504	11,394
Deferred income taxes	4,208	(2,741)
Stock-based compensation	5,351	4,959
Unrealized (gains) losses on foreign currency transactions	3,462	4,802
Other	842	175
Provisions for inventory, warranty & bad debt	9,002	8,927
Changes in assets and liabilities that (used) provided cash:
Accounts receivable	(22,801)	8,140
Inventories	(22,408)	(19,365)
Prepaid expenses and other current assets	(3,972)	(178)
Accounts payable	(1,560)	(6,749)
Accrued expenses and other liabilities	(659)	(8,378)
Income and other taxes payable	(10,081)	14,583
Net cash provided by operating activities	50,820	64,897
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of and deposits on property, plant and equipment	(21,875)	(24,960)
Proceeds from sales of property, plant and equipment	99	129
Purchases of short-term investments	(28,173)	(29,899)
Proceeds from short-term investments	70,370	10,000
Other	(47)	46
Net cash provided by (used in) investing activities	20,374	(44,684)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line-of-credit facilities	1,934	2,214
Payments on line-of-credit facilities	(1,934)	(2,223)
Principal payments on long-term borrowings	(797)	(500)
Exercise of employee stock options and shares withheld to cover employee restricted stock taxes	9,600	2,644
Purchase of treasury stock, at cost	(12,539)	0
Net cash (used in) provided by financing activities	(3,736)	2,135
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	6,465	8,812
NET INCREASE IN CASH AND CASH EQUIVALENTS	73,923	31,160
CASH AND CASH EQUIVALENTS — Beginning of period	623,855	582,532
CASH AND CASH EQUIVALENTS — End of period	697,778	613,692
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	447	171
Cash paid for income taxes	31,371	11,955
Non-cash transactions:
Demonstration units transferred from inventory to other assets	802	623
Inventory transferred to machinery and equipment	1,051	361
(Reductions) additions to property, plant and equipment included in accounts payable	$ (1,310)	$ 326

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]
Recently adopted accounting standards (NOTE 2)				$ 0	$ 0
Balance, beginning of year at Dec. 31, 2015		$ 5	$ 0	607,649	833,356	$ (181,482)		$ 1,137
Balance, beginning of year (in shares) at Dec. 31, 2015		(52,883,902)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		82,558
Purchased treasury stock (in shares)		0	0
Purchased common stock		$ 0	$ 0
Stock-based compensation				4,959
Exercise of employee stock options and shares withheld to cover employee restricted stock taxes		0		3,548
Net income attributable to IPG Photonics Corporation	$ 49,326				49,326
Translation adjustments	28,495					28,495
Change in unrealized loss on derivatives, net of tax	0					0
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) income attributable to NCI	2							2
Other comprehensive income attributable to NCI	5							3
Balance, end of period at Mar. 31, 2016	1,346,998	$ 5	$ 0	616,156	882,682	(152,987)	$ 1,345,856	1,142
Balance, end of period (in shares) at Mar. 31, 2016		(52,966,460)	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Recently adopted accounting standards (NOTE 2)				2,078	2,145
Balance, beginning of year at Dec. 31, 2016	1,557,724	$ 5	$ (8,946)	650,974	1,094,108	(178,583)		166
Balance, beginning of year (in shares) at Dec. 31, 2016		(53,251,805)	(102,774)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (in shares)		281,840
Purchased treasury stock (in shares)		(107,700)	(107,700)
Purchased common stock		$ 0	$ (12,539)
Stock-based compensation				5,351
Exercise of employee stock options and shares withheld to cover employee restricted stock taxes		0		9,600
Net income attributable to IPG Photonics Corporation	74,945				74,945
Translation adjustments	26,699					26,675
Change in unrealized 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) income attributable to NCI	(13)							(13)
Other comprehensive income attributable to NCI	11							24
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
Balance, end of period (in shares) at Mar. 31, 2017		(53,425,945)	(210,474)

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [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. 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, 2016 . 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.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS In March 2016, the FASB issued ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" ("ASU 2016-09"). ASU 2016-09 is intended to simplify several areas of accounting for share-based compensation arrangements, including income tax impact and classification on the consolidated statement of cash flows. ASU 2016-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and the Company adopted this statement effective January 1, 2017. Under ASU 2016-09, excess tax benefits and deficiencies as a result of stock option exercises and restricted stock unit vesting are to be recognized as discrete items within income tax expense or benefit in the consolidated statements of comprehensive income in the reporting period in which they occur. Upon adoption, the Company recognized excess tax benefits from stock award exercises and restricted stock unit vesting in the first quarter of 2017 as a discrete tax benefit which reduced the provision for income taxes for the three months ended March 31, 2017 , by $4,130 . The adoption of ASU 2016-09 also changed the calculation of fully diluted shares outstanding for the three months ended March 31, 2017 . The excess tax benefits have been excluded from the calculation of assumed proceeds in the Company's calculation of diluted weighted shares under the new standard. The Company's diluted weighted shares outstanding as of March 31, 2017 , increased by 184,161 shares due to adoption of the new standard. The adoption of ASU 2016-09 also requires the cumulative effect of initially applying the standard to be recorded as an adjustment to the opening balance of retained earnings of the annual reporting period that includes the date of initial application. This resulted in a cumulative effect increase of $3,464 to retained earnings and deferred tax assets. Also, as a result of the adoption of ASU 2016-09, the Company has made an accounting policy election to record forfeitures as they occur rather than estimating expected forfeitures. The calculated cumulative effect was a decrease in retained earnings by $1,319 and an increase in deferred tax assets and additional paid-in capital by $759 and $2,078 , respectively, as of January 1, 2017. In February 2017, the FASB issued ASU No. 2017-05, "Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20)" ("ASU 2017-05"). ASU 2017-05 was issued in conjunction with ASU No. 2014-09, "Revenue from Contracts with Customers" ("ASU 2014-09"), to clarify guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The new guidance clarifies what constitutes an "in substance nonfinancial asset" and changes the accounting for partial sales of nonfinancial assets to be more consistent with the accounting for a sale of a business. The amendments should be applied at the same time as those in ASU 2014-09 with interim and annual reporting periods beginning after December 15, 2017, which would be the Company's fiscal year ending December 31, 2018. The Company is currently evaluating the potential impact that the standard will have on its consolidated financial statements upon adoption. 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. ASU 2017-04 is effective for public companies for annual reporting periods beginning after December 15, 2020, and interim reporting periods within such period. The amendments should be applied prospectively on or after the effective date and require a disclosure as to the nature of and reason for the change in accounting principle upon transition. Early adoption is allowed for all entities as of January 1, 2017, for annual and any interim impairment tests occurring after January 1, 2017. The Company is currently evaluating the potential impact that the standard will have on its consolidated financial statements upon adoption. In January 2017, the FASB issued ASU No. 2017-01, "Business Combinations (Topic 805)" ("ASU 2017-01"). ASU 2017-01 revises the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 is effective for public companies for annual reporting periods beginning after December 15, 2017, and interim reporting periods within such period. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. Early application generally is allowed for transactions that have not been reported in financial statements which have been issued or made available for issuance. The Company is currently evaluating the potential impact that the standard will have on its consolidated financial statements upon adoption. 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 will be applied on a modified retrospective basis through a cumulative effect adjustment to retained earnings. Deferred tax assets should be assessed to determine if realizable. Disclosures will be required for the (i) reason for and notice of change, (ii) effect of change on income from continuing operations and (iii) cumulative effect of change on retained earnings. Public entities will apply these changes in annual reporting periods beginning after December 15, 2017, and interim reporting periods within such period. 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. 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. In January 2016, the FASB issued ASU No. 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" ("ASU 2016-01"). ASU 2016-01 addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is not permitted. The Company is currently evaluating the impact that the standard will have and does not expect it to have a material effect on its consolidated financial statements upon adoption. In May 2014, the FASB issued ASU No. 2014-09. ASU 2014-09 supersedes the revenue recognition requirements in "Revenue Recognition (Topic 605)", and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. In August 2015, the FASB issued ASU No. 2015-14 "Revenue from Contracts with Customers" ("ASU 2015-14"), which defers the effective date of ASU 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017, which would be the Company's fiscal year ending December 31, 2018. This additional guidance does not change the core principle of the revenue recognition guidance issued in May 2014, rather, it provides clarification of accounting for collections of sales taxes as well as recognition of revenue (i) associated with contract modifications, (ii) for noncash consideration, and (iii) based on the collectability of the consideration from the customer. The guidance also specifies when a contract should be considered "completed" for purposes of applying the transition guidance. The Company has completed an initial assessment of the new guidance and is currently evaluating the impact this standard may have on its financial statements. The Company has not decided upon which one of two retrospective application methods it will be using upon adoption.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2017
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: March 31, December 31, 2017 2016 Components and raw materials $ 106,829 $ 93,284 Work-in-process 24,666 44,723 Finished components and devices 130,398 101,003 Total $ 261,893 $ 239,010 The Company recorded inventory provisions totaling $3,971 and $3,953 for the three months ended March 31, 2017 and 2016 , 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.

Accrued Expenses And Other Liab

Accrued Expenses And Other Liabilities	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 Accrued compensation $ 37,607 $ 43,761 Customer deposits and deferred revenue 43,212 34,571 Current portion of accrued warranty 16,974 15,711 Other 7,944 8,442 Total $ 105,737 $ 102,485

Financing Arrangements

Financing Arrangements	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Financing Arrangements	FINANCING ARRANGEMENTS The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2017 2016 Term debt: Long-term notes $ 40,027 $ 40,823 Less: current portion (3,188 ) (3,188 ) Total long-term debt $ 36,839 $ 37,635 The U.S. and Euro lines-of-credit are available to certain foreign subsidiaries and allow for borrowings in the local currencies of those subsidiaries. The U.S. line-of-credit is also available to the Company. At March 31, 2017 and December 31, 2016 , there were no amounts drawn on the U.S. line-of-credit, and there were $22 and $2,828 , respectively, of guarantees issued against the facility which reduces the amount of the facility available to draw. At March 31, 2017 and December 31, 2016 , there were no amounts drawn on the Euro line-of-credit, and there were $12,716 and $8,221 , respectively, of guarantees issued against the facility which reduces the amount of the facility available to draw. At March 31, 2017 , the amount due on the two long-term notes was $40,027 of which $3,188 is the current portion. The Company has an unsecured note of $22,860 of which $1,188 is the current portion. The interest on this unsecured note is variable at 1.20% above the LIBOR rate and is fixed using an interest rate swap at 2.85% per annum. The unsecured note matures in May 2023, at which time the outstanding debt balance will be $15,438 . The Company has another note that is secured by the Company's corporate aircraft of $17,167 of which $2,000 is the current portion. The interest rate on this secured note is fixed at 2.81% per annum and the collateralized long-term note matures in October 2019, at which time the outstanding debt balance will be $12,000 .

Net Income Attributable To IPG

Net Income Attributable To IPG Photonics Corporation Per Share	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 Net income attributable to IPG Photonics Corporation $ 74,945 $ 49,326 Weighted average shares 53,368 52,898 Dilutive effect of common stock equivalents 1,002 723 Diluted weighted average common shares 54,370 53,621 Basic net income attributable to IPG Photonics Corporation per share $ 1.40 $ 0.93 Diluted net income attributable to IPG Photonics Corporation per share $ 1.38 $ 0.92 For the three months ended March 31, 2017 and 2016 , respectively, the computation of diluted weighted average common shares excludes common stock equivalents of 73,300 shares and 65,100 shares which includes restricted stock units ("RSUs") of 44,400 and 49,600 and performance stock units ("PSUs") of 17,100 and 15,000 , respectively. These common stock equivalents are excluded because the effect of including them would be anti-dilutive. 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, 2017 , the Company repurchased 107,700 shares of its common stock with an average price of $116.42 per share in the open market. The impact on the reduction of weighted average shares for the three months ended March 31, 2017 was 31,140 shares. As the Program was announced in July 2016, there were repurchases made by the Company for the three months ended March 31, 2016 .

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2017
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 uses 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 has no derivatives that are not accounted for as a hedging instrument. Cash flow hedges – The Company entered into a cash flow hedge which is an interest rate swap associated with a long-term note issued during the second quarter of 2016 that will terminate with the long-term note in May 2023. The fair value amounts in the consolidated balance sheet related to the interest rate swap was: Notional Amounts 1 Other Assets Other Long-Term Liabilities March 31, December 31, March 31, December 31, March 31, December 31, 2017 2016 2017 2016 2017 2016 $ 22,860 $ 23,156 $ 50 $ 77 $ — $ — (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 contracts was as follows: Three Months Ended March 31, 2017 2016 Effective portion recognized in other comprehensive income, pretax: Interest rate swap $ (27 ) $ — Effective portion reclassified from other comprehensive income to interest expense, pretax: Interest rate swap $ — $ — Ineffective portion recognized in income: Interest rate swap $ — $ —

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2017
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 swaps. 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, drawings on revolving lines of credit, the long-term notes and interest rate swaps 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. The following table presents information about the Company's assets and liabilities measured at fair value: Fair Value Measurements at March 31, 2017 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 306,000 $ 306,000 $ — $ — Short-term investments 164,928 164,928 — — Interest rate swap 50 — 50 — Auction rate securities 1,146 — — 1,146 Total assets $ 472,124 $ 470,928 $ 50 $ 1,146 Liabilities Long-term notes $ 40,500 $ — $ 40,500 $ — Total liabilities $ 40,500 $ — $ 40,500 $ — Fair Value Measurements at December 31, 2016 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 179,699 $ 179,699 $ — $ — Short-term investments 206,616 206,616 — — Interest rate swap 77 — 77 — Auction rate securities 1,144 — — 1,144 Total assets $ 387,536 $ 386,315 $ 77 $ 1,144 Liabilities Long-term notes $ 41,351 $ — $ 41,351 $ — Total liabilities $ 41,351 $ — $ 41,351 $ — Short-term investments are recorded at book value. Unrealized gains or losses are not recorded since these investments are considered held-to-maturity and 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. The fair value of the short-term investments considered available-for-sale as of December 31, 2016 was $41,591 . This amount included an unrealized loss of $432 . There were no short-term investments considered available-for-sale as of March 31, 2017 . The fair value of the short-term investments considered held-to-maturity as of March 31, 2017 and December 31, 2016 was $164,928 and $165,025 , respectively, which represents an unrealized loss of $97 and $163 , respectively, as compared to the book value recorded on the Consolidated Balance Sheets for the same periods. The fair value of the auction rate securities considered prices observed in inactive secondary markets for the securities held by the Company. The fair value of accrued contingent purchase consideration incurred was determined using an income approach at the acquisition date and reporting date. That approach is based on significant inputs that are not observable in the market. Key assumptions include 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, 2017 2016 Auction Rate Securities Balance, beginning of period $ 1,144 $ 1,136 Change in fair value and accretion 2 2 Balance, end of period $ 1,146 $ 1,138 Contingent Purchase Consideration Balance, beginning of period $ — $ 20 Period transactions — — Change in fair value and currency fluctuations — 1 Balance, end of period $ — $ 21

Goodwill And Intangibles

Goodwill And Intangibles	3 Months Ended
	Mar. 31, 2017
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, 2017 : Amounts Balance at January 1 $ 19,828 Foreign exchange adjustment 3 Total goodwill arising from acquisition — Balance at March 31 $ 19,831 Intangible assets, subject to amortization, consisted of the following: March 31, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Patents $ 8,114 $ (5,015 ) $ 3,099 7 Years $ 8,114 $ (4,926 ) $ 3,188 7 Years Customer relationships 12,777 (3,914 ) 8,863 9 Years 12,727 (3,621 ) 9,106 9 Years Production know-how 6,641 (4,305 ) 2,336 8 Years 6,618 (4,093 ) 2,525 8 Years Technology, trademark and tradename 18,134 (4,540 ) 13,594 8 Years 17,910 (3,940 ) 13,970 8 Years $ 45,666 $ (17,774 ) $ 27,892 $ 45,369 $ (16,580 ) $ 28,789 Amortization expense for the three months ended March 31, 2017 and 2016 was $1,065 and $543 , respectively. The estimated future amortization expense for intangibles for the remainder of 2017 and subsequent years is as follows: 2017 2018 2019 2020 2021 Thereafter Total $3,364 $4,421 $4,373 $3,755 $3,585 $8,394 $27,892

Product Warranties

Product Warranties	3 Months Ended
	Mar. 31, 2017
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 activity recorded during the three months ended March 31, 2017 and 2016 . 2017 2016 Balance at January 1 $ 33,978 $ 28,210 Provision for warranty accrual 4,523 4,814 Warranty claims (2,966 ) (3,562 ) Foreign currency translation 438 780 Balance at March 31 $ 35,973 $ 30,242 Accrued warranty reported in the accompanying consolidated financial statements as of March 31, 2017 and December 31, 2016 consisted of $16,974 and $15,711 in accrued expenses and other liabilities and $18,999 and $18,267 in other long-term liabilities, respectively.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES A reconciliation of the total amounts of unrecognized tax benefits is as follows: 2017 2016 Balance at January 1 $ 6,403 $ 7,579 Reductions of prior period positions — — Additions for tax positions in prior period — — (Reductions) additions for tax positions in current period — — Balance at March 31 $ 6,403 $ 7,579 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.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2017
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, 2017 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.

Long-Lived Assets

Long-Lived Assets	3 Months Ended
	Mar. 31, 2017
Property, Plant and Equipment [Abstract]
Long-Lived Assets	LONG-LIVED ASSETS Long-lived assets, which consist primarily of property, plant and equipment, are reviewed by management for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. In cases in which undiscounted expected future cash flows are less than the carrying value, an impairment loss is recorded equal to the amount by which the carrying value exceeds the fair value of assets. In the fourth quarter of 2016, the Company began assessing the possible sale of its corporate aircraft included within Property, Plant and Equipment, net in its Consolidated Balance Sheets. As a result of this assessment and certain market indications of the aircraft's value if sold, the Company prepared an updated impairment analysis of the carrying value of the aircraft as of March 31, 2017 . The impairment analysis was probability weighted considering market data available, future cash flows and whether or not the Company would sell the aircraft. Based on that analysis the Company recorded a $162 impairment charge included in general and administrative expense in its Consolidated Statements of Income as of March 31, 2017 . There were no impairment losses recorded by the Company for the three months ended March 31, 2016 .

Recent Accounting Pronounceme21

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS In March 2016, the FASB issued ASU No. 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting" ("ASU 2016-09"). ASU 2016-09 is intended to simplify several areas of accounting for share-based compensation arrangements, including income tax impact and classification on the consolidated statement of cash flows. ASU 2016-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and the Company adopted this statement effective January 1, 2017. Under ASU 2016-09, excess tax benefits and deficiencies as a result of stock option exercises and restricted stock unit vesting are to be recognized as discrete items within income tax expense or benefit in the consolidated statements of comprehensive income in the reporting period in which they occur. Upon adoption, the Company recognized excess tax benefits from stock award exercises and restricted stock unit vesting in the first quarter of 2017 as a discrete tax benefit which reduced the provision for income taxes for the three months ended March 31, 2017 , by $4,130 . The adoption of ASU 2016-09 also changed the calculation of fully diluted shares outstanding for the three months ended March 31, 2017 . The excess tax benefits have been excluded from the calculation of assumed proceeds in the Company's calculation of diluted weighted shares under the new standard. The Company's diluted weighted shares outstanding as of March 31, 2017 , increased by 184,161 shares due to adoption of the new standard. The adoption of ASU 2016-09 also requires the cumulative effect of initially applying the standard to be recorded as an adjustment to the opening balance of retained earnings of the annual reporting period that includes the date of initial application. This resulted in a cumulative effect increase of $3,464 to retained earnings and deferred tax assets. Also, as a result of the adoption of ASU 2016-09, the Company has made an accounting policy election to record forfeitures as they occur rather than estimating expected forfeitures. The calculated cumulative effect was a decrease in retained earnings by $1,319 and an increase in deferred tax assets and additional paid-in capital by $759 and $2,078 , respectively, as of January 1, 2017. In February 2017, the FASB issued ASU No. 2017-05, "Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20)" ("ASU 2017-05"). ASU 2017-05 was issued in conjunction with ASU No. 2014-09, "Revenue from Contracts with Customers" ("ASU 2014-09"), to clarify guidance for recognizing gains and losses from the transfer of nonfinancial assets in contracts with non-customers. The new guidance clarifies what constitutes an "in substance nonfinancial asset" and changes the accounting for partial sales of nonfinancial assets to be more consistent with the accounting for a sale of a business. The amendments should be applied at the same time as those in ASU 2014-09 with interim and annual reporting periods beginning after December 15, 2017, which would be the Company's fiscal year ending December 31, 2018. The Company is currently evaluating the potential impact that the standard will have on its consolidated financial statements upon adoption. 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. ASU 2017-04 is effective for public companies for annual reporting periods beginning after December 15, 2020, and interim reporting periods within such period. The amendments should be applied prospectively on or after the effective date and require a disclosure as to the nature of and reason for the change in accounting principle upon transition. Early adoption is allowed for all entities as of January 1, 2017, for annual and any interim impairment tests occurring after January 1, 2017. The Company is currently evaluating the potential impact that the standard will have on its consolidated financial statements upon adoption. In January 2017, the FASB issued ASU No. 2017-01, "Business Combinations (Topic 805)" ("ASU 2017-01"). ASU 2017-01 revises the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. ASU 2017-01 is effective for public companies for annual reporting periods beginning after December 15, 2017, and interim reporting periods within such period. The amendments should be applied prospectively on or after the effective date. No disclosures are required at transition. Early application generally is allowed for transactions that have not been reported in financial statements which have been issued or made available for issuance. The Company is currently evaluating the potential impact that the standard will have on its consolidated financial statements upon adoption. 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 will be applied on a modified retrospective basis through a cumulative effect adjustment to retained earnings. Deferred tax assets should be assessed to determine if realizable. Disclosures will be required for the (i) reason for and notice of change, (ii) effect of change on income from continuing operations and (iii) cumulative effect of change on retained earnings. Public entities will apply these changes in annual reporting periods beginning after December 15, 2017, and interim reporting periods within such period. 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. 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. In January 2016, the FASB issued ASU No. 2016-01, "Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities" ("ASU 2016-01"). ASU 2016-01 addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. ASU 2016-01 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2017, and early adoption is not permitted. The Company is currently evaluating the impact that the standard will have and does not expect it to have a material effect on its consolidated financial statements upon adoption. In May 2014, the FASB issued ASU No. 2014-09. ASU 2014-09 supersedes the revenue recognition requirements in "Revenue Recognition (Topic 605)", and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. In August 2015, the FASB issued ASU No. 2015-14 "Revenue from Contracts with Customers" ("ASU 2015-14"), which defers the effective date of ASU 2014-09 one year to interim and annual reporting periods beginning after December 15, 2017, which would be the Company's fiscal year ending December 31, 2018. This additional guidance does not change the core principle of the revenue recognition guidance issued in May 2014, rather, it provides clarification of accounting for collections of sales taxes as well as recognition of revenue (i) associated with contract modifications, (ii) for noncash consideration, and (iii) based on the collectability of the consideration from the customer. The guidance also specifies when a contract should be considered "completed" for purposes of applying the transition guidance. The Company has completed an initial assessment of the new guidance and is currently evaluating the impact this standard may have on its financial statements. The Company has not decided upon which one of two retrospective application methods it will be using upon adoption.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2017
Inventory Disclosure [Abstract]
Components Of Inventories	Inventories consist of the following: March 31, December 31, 2017 2016 Components and raw materials $ 106,829 $ 93,284 Work-in-process 24,666 44,723 Finished components and devices 130,398 101,003 Total $ 261,893 $ 239,010

Accrued Expenses And Other Li23

Accrued Expenses And Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2017
Payables and Accruals [Abstract]
Components Of Accrued Expenses And Other Liabilities	Accrued expenses and other liabilities consist of the following: March 31, December 31, 2017 2016 Accrued compensation $ 37,607 $ 43,761 Customer deposits and deferred revenue 43,212 34,571 Current portion of accrued warranty 16,974 15,711 Other 7,944 8,442 Total $ 105,737 $ 102,485

Financing Arrangements (Tables)

Financing Arrangements (Tables)	3 Months Ended
	Mar. 31, 2017
Debt Disclosure [Abstract]
Borrowings Under Existing Financing Arrangements	The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2017 2016 Term debt: Long-term notes $ 40,027 $ 40,823 Less: current portion (3,188 ) (3,188 ) Total long-term debt $ 36,839 $ 37,635

Net Income Attributable To IP25

Net Income Attributable To IPG Photonics Corporation Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
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, 2017 2016 Net income attributable to IPG Photonics Corporation $ 74,945 $ 49,326 Weighted average shares 53,368 52,898 Dilutive effect of common stock equivalents 1,002 723 Diluted weighted average common shares 54,370 53,621 Basic net income attributable to IPG Photonics Corporation per share $ 1.40 $ 0.93 Diluted net income attributable to IPG Photonics Corporation per share $ 1.38 $ 0.92

Derivative Financial Instrume26

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Cash Flow Hedges	The fair value amounts in the consolidated balance sheet related to the interest rate swap was: Notional Amounts 1 Other Assets Other Long-Term Liabilities March 31, December 31, March 31, December 31, March 31, December 31, 2017 2016 2017 2016 2017 2016 $ 22,860 $ 23,156 $ 50 $ 77 $ — $ — (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 contracts was as follows: Three Months Ended March 31, 2017 2016 Effective portion recognized in other comprehensive income, pretax: Interest rate swap $ (27 ) $ — Effective portion reclassified from other comprehensive income to interest expense, pretax: Interest rate swap $ — $ — Ineffective portion recognized in income: Interest rate swap $ — $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2017
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, 2017 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 306,000 $ 306,000 $ — $ — Short-term investments 164,928 164,928 — — Interest rate swap 50 — 50 — Auction rate securities 1,146 — — 1,146 Total assets $ 472,124 $ 470,928 $ 50 $ 1,146 Liabilities Long-term notes $ 40,500 $ — $ 40,500 $ — Total liabilities $ 40,500 $ — $ 40,500 $ — Fair Value Measurements at December 31, 2016 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 179,699 $ 179,699 $ — $ — Short-term investments 206,616 206,616 — — Interest rate swap 77 — 77 — Auction rate securities 1,144 — — 1,144 Total assets $ 387,536 $ 386,315 $ 77 $ 1,144 Liabilities Long-term notes $ 41,351 $ — $ 41,351 $ — Total liabilities $ 41,351 $ — $ 41,351 $ —
Fair Value, Assets Measured on Recurring Basis	Three Months Ended March 31, 2017 2016 Auction Rate Securities Balance, beginning of period $ 1,144 $ 1,136 Change in fair value and accretion 2 2 Balance, end of period $ 1,146 $ 1,138 Contingent Purchase Consideration Balance, beginning of period $ — $ 20 Period transactions — — Change in fair value and currency fluctuations — 1 Balance, end of period $ — $ 21
Fair Value, Liabilities Measured on Recurring Basis	Three Months Ended March 31, 2017 2016 Auction Rate Securities Balance, beginning of period $ 1,144 $ 1,136 Change in fair value and accretion 2 2 Balance, end of period $ 1,146 $ 1,138 Contingent Purchase Consideration Balance, beginning of period $ — $ 20 Period transactions — — Change in fair value and currency fluctuations — 1 Balance, end of period $ — $ 21

Goodwill And Intangibles (Table

Goodwill And Intangibles (Tables)	3 Months Ended
	Mar. 31, 2017
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, 2017 : Amounts Balance at January 1 $ 19,828 Foreign exchange adjustment 3 Total goodwill arising from acquisition — Balance at March 31 $ 19,831
Intangible Assets	Intangible assets, subject to amortization, consisted of the following: March 31, 2017 December 31, 2016 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Patents $ 8,114 $ (5,015 ) $ 3,099 7 Years $ 8,114 $ (4,926 ) $ 3,188 7 Years Customer relationships 12,777 (3,914 ) 8,863 9 Years 12,727 (3,621 ) 9,106 9 Years Production know-how 6,641 (4,305 ) 2,336 8 Years 6,618 (4,093 ) 2,525 8 Years Technology, trademark and tradename 18,134 (4,540 ) 13,594 8 Years 17,910 (3,940 ) 13,970 8 Years $ 45,666 $ (17,774 ) $ 27,892 $ 45,369 $ (16,580 ) $ 28,789
Estimated Future Amortization Expense For Intangibles	The estimated future amortization expense for intangibles for the remainder of 2017 and subsequent years is as follows: 2017 2018 2019 2020 2021 Thereafter Total $3,364 $4,421 $4,373 $3,755 $3,585 $8,394 $27,892

Product Warranties (Tables)

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2017
Product Warranties Disclosures [Abstract]
Summary Of Product Warranty Activity	The following table summarizes product warranty activity recorded during the three months ended March 31, 2017 and 2016 . 2017 2016 Balance at January 1 $ 33,978 $ 28,210 Provision for warranty accrual 4,523 4,814 Warranty claims (2,966 ) (3,562 ) Foreign currency translation 438 780 Balance at March 31 $ 35,973 $ 30,242

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Schedule of Unrecognized Tax Benefits	A reconciliation of the total amounts of unrecognized tax benefits is as follows: 2017 2016 Balance at January 1 $ 6,403 $ 7,579 Reductions of prior period positions — — Additions for tax positions in prior period — — (Reductions) additions for tax positions in current period — — Balance at March 31 $ 6,403 $ 7,579

Recent Accounting Pronounceme31

Recent Accounting Pronouncements (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Jan. 01, 2017	Dec. 31, 2016	Dec. 31, 2015
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle			$ (2,145,000)	$ 0
Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle			$ (2,078,000)	$ 0
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit	$ 4,130,000
Increase in diluted weighted shares outstanding (in shares)	184,161
Accounting Standards Update 2016-09, Excess Tax Benefit Component
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets		$ 3,464,000
Accounting Standards Update 2016-09, Excess Tax Benefit Component | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle		(3,464,000)
Accounting Standards Update 2016-09, Forfeiture Rate Component
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Deferred tax assets		759,000
Accounting Standards Update 2016-09, Forfeiture Rate Component | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle		1,319,000
Accounting Standards Update 2016-09, Forfeiture Rate Component | Additional Paid-in Capital
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle		$ (2,078,000)

Inventories (Components Of Inve

Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Components and raw materials	$ 106,829	$ 93,284
Work-in-process	24,666	44,723
Finished components and devices	130,398	101,003
Total	$ 261,893	$ 239,010

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Inventory Disclosure [Abstract]
Inventory provisions	$ 3,971	$ 3,953

Accrued Expenses And Other Li34

Accrued Expenses And Other Liabilities (Components Of Accrued Expenses And Other Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Payables and Accruals [Abstract]
Accrued compensation	$ 37,607	$ 43,761
Customer deposits and deferred revenue	43,212	34,571
Current portion of accrued warranty	16,974	15,711
Other	7,944	8,442
Total	$ 105,737	$ 102,485

Financing Arrangements (Borrowi

Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Term debt:
Less: current portion	$ (3,188)	$ (3,188)
Total long-term debt	36,839	37,635
Long-term notes
Term debt:
Long-term notes	$ 40,027	$ 40,823

Financing Arrangements (Narrati

Financing Arrangements (Narrative) (Details)	3 Months Ended
	Mar. 31, 2017USD ($)note	May 31, 2023USD ($)	Oct. 31, 2019USD ($)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Number of long term notes | note	2
Unsecured note	$ 22,860,000
Unsecured Debt
Debt Instrument [Line Items]
Current portion of long-term note	$ 1,188,000
Unsecured Debt | Scenario, Forecast
Debt Instrument [Line Items]
Amount due on long-term note		$ 15,438,000
Unsecured Debt | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate	1.20%
Unsecured Debt | Interest rate swap
Debt Instrument [Line Items]
Derivative, fixed interest rate	2.85%
Secured Debt
Debt Instrument [Line Items]
Amount due on long-term note	$ 17,167,000
Current portion of long-term note	$ 2,000,000
Interest rate percentage	2.81%
Secured Debt | Scenario, Forecast
Debt Instrument [Line Items]
Amount due on long-term note			$ 12,000,000
U.S. line-of-credit
Debt Instrument [Line Items]
Line of credit	$ 0			$ 0
Guarantees issued	22,000			2,828,000
Euro line-of-credit
Debt Instrument [Line Items]
Line of credit	0			0
Guarantees issued	12,716,000			$ 8,221,000
Long-term notes
Debt Instrument [Line Items]
Amount due on long-term note	40,027,000
Current portion of long-term note	$ 3,188,000

Net Income Attributable To IP37

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, 2017	Mar. 31, 2016
Earnings Per Share [Abstract]
Net income attributable to IPG Photonics Corporation	$ 74,945	$ 49,326
Weighted average shares (in shares)	53,368	52,898
Dilutive effect of common stock equivalents (in shares)	1,002	723
Diluted weighted average common shares (in shares)	54,370	53,621
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.40	$ 0.93
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.38	$ 0.92

Net Income Attributable to IP38

Net Income Attributable to IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Jul. 28, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares (in shares)	73,300,000	65,100,000
Share repurchase amount (no more than)			$ 100,000
Stock repurchased during period (in shares)	107,700
Stock repurchase average price (in dollars per share)	$ 116.42
Decrease in weighted average shares outstanding, treasury stock (in shares)	31,140
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares (in shares)	44,400,000	49,600,000
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares (in shares)	17,100,000	15,000,000

Derivative Financial Instrume39

Derivative Financial Instruments (Fair Value Of Cash Flow Hedges) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Interest rate swap
Derivatives, Fair Value [Line Items]
Notional amounts	$ 22,860,000	$ 23,156,000
Nondesignated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amounts	0
Other Assets | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	50,000	77,000
Other Long-Term Liabilities | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 0	$ 0

Derivative Financial Instrume40

Derivative Financial Instruments (Derivative Gains (Losses) In The Consolidated Statements Of Income Related To Interest Rate Swap Contracts) (Details) - Interest rate swap - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion recognized in other comprehensive income, pretax	$ (27)	$ 0
Effective portion reclassified from other comprehensive income to interest expense, pretax	0	0
Ineffective portion recognized in income	$ 0	$ 0

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 472,124,000	$ 387,536,000
Liabilities	40,500,000	41,351,000
Unrealized loss, short-term investments considered available-for-sale		432,000
Available-for-sale Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	41,591,000
Held-to-maturity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized loss, investments	97,000	163,000
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	470,928,000	386,315,000
Liabilities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	50,000	77,000
Liabilities	40,500,000	41,351,000
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,146,000	1,144,000
Liabilities	0	0
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	306,000,000	179,699,000
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	306,000,000	179,699,000
Cash equivalents | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Cash equivalents | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	164,928,000	206,616,000
Short-term investments | Held-to-maturity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	164,928,000	165,025,000
Short-term investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	164,928,000	206,616,000
Short-term investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Short-term investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Interest rate swap
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	50,000	77,000
Interest rate swap | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Interest rate swap | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	50,000	77,000
Interest rate swap | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,146,000	1,144,000
Auction rate securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Auction rate securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Auction rate securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,146,000	1,144,000
Long-term notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	40,500,000	41,351,000
Long-term notes | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Long-term notes | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	40,500,000	41,351,000
Long-term notes | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	$ 0	$ 0

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, 2017	Mar. 31, 2016
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 1,144	$ 1,136
Change in fair value and accretion	2	2
Balance, end of period	1,146	1,138
Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	20
Period transactions	0	0
Change in fair value and currency fluctuations	0	1
Balance, end of period	$ 0	$ 21

Goodwill And Intangibles (Sched

Goodwill And Intangibles (Schedule of Changes) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)
Goodwill [Roll Forward]
Balance at January 1	$ 19,828
Foreign exchange adjustment	3
Total goodwill arising from acquisition	0
Balance at March 31	$ 19,831

Goodwill And Intangibles (Intan

Goodwill And Intangibles (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 45,666	$ 45,369
Accumulated Amortization	(17,774)	(16,580)
Net Carrying Amount	27,892	28,789
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,114	8,114
Accumulated Amortization	(5,015)	(4,926)
Net Carrying Amount	$ 3,099	$ 3,188
Weighted- Average Lives	7 years	7 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 12,777	$ 12,727
Accumulated Amortization	(3,914)	(3,621)
Net Carrying Amount	$ 8,863	$ 9,106
Weighted- Average Lives	9 years	9 years
Production know-how
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,641	$ 6,618
Accumulated Amortization	(4,305)	(4,093)
Net Carrying Amount	$ 2,336	$ 2,525
Weighted- Average Lives	8 years	8 years
Technology, trademark and tradename
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 18,134	$ 17,910
Accumulated Amortization	(4,540)	(3,940)
Net Carrying Amount	$ 13,594	$ 13,970
Weighted- Average Lives	8 years	8 years

Goodwill And Intangibles (Narra

Goodwill And Intangibles (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,065	$ 543

Goodwill And Intangibles (Estim

Goodwill And Intangibles (Estimated Future Amortization Expense For Intangibles) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
2,017	$ 3,364
2,018	4,421
2,019	4,373
2,020	3,755
2,021	3,585
Thereafter	8,394
Net Carrying Amount	$ 27,892	$ 28,789

Product Warranties (Narrative)

Product Warranties (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Product Warranty Liability [Line Items]
Accrued warranty reported in accrued expenses and other liabilities	$ 16,974	$ 15,711
Accrued warranty reported in other long-term liabilities	$ 18,999	$ 18,267
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, 2017	Mar. 31, 2016
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 33,978	$ 28,210
Provision for warranty accrual	4,523	4,814
Warranty claims	(2,966)	(3,562)
Foreign currency translation	438	780
Balance at March 31	$ 35,973	$ 30,242

Income Taxes (Schedule of Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 6,403	$ 7,579
Reductions of prior period positions	0	0
Additions for tax positions in prior period	0	0
(Reductions) additions for tax positions in current period	0	0
Balance at March 31	$ 6,403	$ 7,579

Commitments And Contingencies (

Commitments And Contingencies (Narrative) (Details)	Mar. 31, 2017USD ($)
Commitments and Contingencies Disclosure [Abstract]
Estimated legal proceedings	$ 0

Long-Lived Assets (Narrative) (

Long-Lived Assets (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Property, Plant and Equipment
Long Lived Assets Held-for-sale [Line Items]
Impairment of long-lived assets	$ 162,000	$ 0