IPG Photonics (IPGP) 10-Q 5 May 20 2020 Q1 Quarterly report Financial data

Cover Page

Cover Page - shares	3 Months Ended
	Mar. 31, 2020	May 04, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-33155
Entity Registrant Name	IPG PHOTONICS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3444218
Entity Address, Address Line One	50 Old Webster Road
Entity Address, City or Town	Oxford
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01540
City Area Code	508
Local Phone Number	373-1100
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Title of 12(b) Security	Common Stock, par value $0.0001 per share
Trading Symbol	IPGP
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding (in shares)		53,027,569
Amendment Flag	false
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020
Entity Central Index Key	0001111928
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 570,058	$ 680,070
Short-term investments	625,085	502,546
Accounts receivable, net	200,646	238,479
Inventories	363,383	380,790
Prepaid income taxes	50,840	38,873
Prepaid expenses and other current assets	64,514	55,876
Total current assets	1,874,526	1,896,634
Deferred income taxes, net	32,801	31,395
Goodwill	81,627	82,092
Intangible assets, net	70,832	74,271
Property, plant and equipment, net	580,980	600,852
Other assets	39,368	45,192
Total assets	2,680,134	2,730,436
Current liabilities:
Current portion of long-term debt	3,757	3,740
Accounts payable	39,648	27,329
Accrued expenses and other current liabilities	148,671	149,782
Income taxes payable	3,356	11,053
Total current liabilities	195,432	191,904
Deferred income taxes and other long-term liabilities	91,750	98,121
Long-term debt, net of current portion	37,022	37,968
Total liabilities	324,204	327,993
Commitments and contingencies (Note 12)
IPG Photonics Corporation equity:
Common stock, $0.0001 par value, 175,000,000 shares authorized; 54,968,352 and 53,127,181 shares issued and outstanding, respectively, at March 31, 2020; 54,743,227 and 53,010,875 shares issued and outstanding, respectively, at December 31, 2019.	6	5
Treasury stock, at cost, 1,841,171 and 1,732,352 shares held at March 31, 2020 and December 31, 2019, respectively.	(278,446)	(265,730)
Additional paid-in capital	788,568	785,636
Retained earnings	2,065,022	2,028,734
Accumulated other comprehensive loss	(220,081)	(146,919)
Total IPG Photonics Corporation equity	2,355,069	2,401,726
Non-controlling interests	861	717
Total equity	2,355,930	2,402,443
Total liabilities and equity	$ 2,680,134	$ 2,730,436

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2020	Dec. 31, 2019
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)	54,968,352	54,743,227
Common stock, shares outstanding (in shares)	53,127,181	53,010,875
Treasury stock, shares (in shares)	1,841,171	1,732,352

Condensed Consolidated Statemen

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net sales	$ 249,242	$ 315,047
Cost of sales	146,366	166,136
Gross profit	102,876	148,911
Operating expenses:
Sales and marketing	18,683	19,275
Research and development	31,838	32,496
General and administrative	27,124	27,212
(Gain) loss on foreign exchange	(19,565)	1,613
Total operating expenses	58,080	80,596
Operating income	44,796	68,315
Other income, net:
Interest income, net	3,073	3,952
Other income (expense), net	191	(9)
Total other income	3,264	3,943
Income before provision for income taxes	48,060	72,258
Provision for income taxes	11,294	17,342
Net income	36,766	54,916
Less: net income (loss) attributable to non-controlling interests	363	(243)
Net income attributable to IPG Photonics Corporation	$ 36,403	$ 55,159
Net income attributable to IPG Photonics Corporation per share:
Basic (in dollars per share)	$ 0.69	$ 1.04
Diluted (in dollars per share)	$ 0.68	$ 1.02
Weighted average shares outstanding:
Basic (in shares)	53,075	53,001
Diluted (in shares)	53,676	53,874

Condensed Consolidated Statem_2

Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 36,766	$ 54,916
Other comprehensive income, net of tax:
Translation adjustments	(73,417)	5,158
Unrealized gain (loss) on derivatives	36	(13)
Total other comprehensive loss	(73,381)	5,145
Comprehensive (loss) income	(36,615)	60,061
Comprehensive income (loss) attributable to non-controlling interests	144	(240)
Comprehensive (loss) income attributable to IPG Photonics Corporation	$ (36,759)	$ 60,301

Condensed Consolidated Statem_3

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 36,766	$ 54,916
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	24,099	22,802
Deferred income taxes	(935)	9,199
Stock-based compensation	8,430	8,138
Unrealized loss (gain) on foreign currency transactions	(19,589)	267
Other	1,015	123
Provisions for inventory, warranty and bad debt	13,486	9,912
Changes in assets and liabilities that (used) provided cash, net of acquisitions:
Accounts receivable	34,492	22,853
Inventories	(10,429)	(19,719)
Prepaid expenses and other assets	(9,119)	1,284
Accounts payable	6,054	1,955
Accrued expenses and other liabilities	(6,477)	(10,274)
Income and other taxes payable	(21,012)	(57,801)
Net cash provided by operating activities	56,781	43,655
Cash flows from investing activities:
Purchases of and deposits on property, plant and equipment	(17,801)	(32,988)
Proceeds from sales of property, plant and equipment	139	181
Purchases of short-term and long-term investments	(308,195)	(178,101)
Proceeds from short-term investments	186,024	202,856
Acquisitions of businesses, net of cash acquired	0	(15,115)
Other	79	15
Net cash used in investing activities	(139,754)	(23,152)
Cash flows from financing activities:
Principal payments on long-term borrowings	(928)	(911)
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	(5,498)	(6,149)
Purchase of treasury stock, at cost	(12,716)	0
Payment of purchase price holdback from business combination	(1,650)	0
Net cash used in financing activities	(20,792)	(7,060)
Effect of changes in exchange rates on cash, cash equivalents and restricted cash	(6,878)	(5,997)
Net increase (decrease) in cash, cash equivalents and restricted cash	(110,643)	7,446
Cash, cash equivalents and restricted cash — Beginning of period	682,984	544,358
Cash, cash equivalents and restricted cash — End of period	572,341	551,804
Supplemental disclosure of cash flow information:
Cash paid for interest	447	749
Cash paid for income taxes	29,865	51,438
Non-cash transactions:
Demonstration units transferred from inventory to other assets	1,086	3,184
Inventory transferred to machinery and equipment	1,294	1,506
Changes in accounts payable related to property, plant and equipment	6,983	1,817
Leased assets obtained in exchange for new operating lease liabilities	$ 830	$ 6,355

Condensed Consolidated Statem_4

Condensed Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Non- controlling Interest
Balance, beginning of year (in shares) at Dec. 31, 2018		52,941,607	1,430,094
Balance, beginning of period at Dec. 31, 2018	$ 2,206,235	$ 5	$ (224,998)	$ 744,937	$ 1,848,500	$ (162,896)	$ 687
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of RSU's and PSU's (in shares)		166,606
Exercise of stock options and vesting of RSU's and PSU's	(6,149)	$ 0		(6,149)
Stock-based compensation	8,138			8,138
Net income	54,916				55,159		(243)
Foreign currency translation adjustments	5,161					5,158	3
Unrealized gain (loss) on derivatives	(13)					(13)
Balance, end of period (in shares) at Mar. 31, 2019		53,108,213	1,430,094
Balance, end of period at Mar. 31, 2019	2,268,288	$ 5	$ (224,998)	746,926	1,903,659	(157,751)	447
Balance, beginning of year (in shares) at Dec. 31, 2019		53,010,875	1,732,352
Balance, beginning of period at Dec. 31, 2019	2,402,443	$ 5	$ (265,730)	785,636	2,028,734	(146,919)	717
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options and vesting of RSU's and PSU's (in shares)		225,125
Exercise of stock options and vesting of RSU's and PSU's	(5,497)	$ 1		(5,498)
Stock-based compensation	8,430			8,430
Net income	36,766				36,403		363
Foreign currency translation adjustments	(73,417)					(73,198)	(219)
Unrealized gain (loss) on derivatives	36					36
Purchased common stock (in shares)		(108,819)	(108,819)
Purchased common stock	(12,716)	$ 0	$ (12,716)
Balance, end of period (in shares) at Mar. 31, 2020		53,127,181	1,841,171
Balance, end of period at Mar. 31, 2020	$ 2,355,930	$ 6	$ (278,446)	$ 788,568	$ 2,065,022	$ (220,081)	$ 861

Basis Of Presentation And Signi

Basis Of Presentation And Significant Accounting Policies	3 Months Ended
	Mar. 31, 2020
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 condensed 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 condensed consolidated financial statements include the Company's accounts and those of its subsidiaries. All intercompany balances have been eliminated in consolidation. These condensed 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, 2019. In the opinion of the Company's management, the 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 condensed consolidated financial statements are not necessarily indicative of results that may be expected for the entire year. Accounts Receivable and Allowance for Doubtful Accounts — The Company maintains an allowance for doubtful accounts to provide for the estimated amount of accounts receivable that will not be collected. The allowance is based upon an estimate of expected credit losses over the life of outstanding receivables. The estimate involves an assessment of customer creditworthiness, historical payment experience, an assumption of future expected credit losses, and the age of outstanding receivables. Activity related to the allowance for doubtful accounts was as follows: Three Months Ended March 31, 2020 2019 Balance at January 1 $ 2,547 $ 1,799 Provision for bad debts, net of recoveries (187) 518 Foreign currency translation (225) (21) Balance at March 31 $ 2,135 $ 2,296

Recent Accounting Pronouncement

Recent Accounting Pronouncements	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS Adopted Pronouncements — In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), which adds an impairment model (known as the current expected credit loss ("CECL") model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses, which the FASB believes will result in more timely recognition of such losses. The ASU is also intended to reduce the complexity by decreasing the number of credit impairment models that entities use to account for debt instruments. The Company adopted ASU 2016-03, along with its subsequent clarifications, as of January 1, 2020. The cumulative effect of the changes made to the Company's condensed consolidated January 1, 2020 balance sheet for the adoption of ASU 2016-13 was as follows: Balance at Adoption of Balance at December 31, 2019 ASU 2016-13 January 1, 2020 Balance Sheet Accounts receivable, net $ 238,479 $ (148) $ 238,331 Deferred income taxes, net 31,395 33 31,428 Retained earnings 2,028,734 (115) 2,028,619

Revenue From Contracts With Cus

Revenue From Contracts With Customers	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue From Contracts With Customers	REVENUE FROM CONTRACTS WITH CUSTOMERS Sales are derived from products for different applications: fiber lasers, diode lasers, diodes and systems for materials processing, fiber lasers and amplifiers for advanced applications, fiber amplifiers for communications applications, and fiber lasers for medical applications. The following tables represent a disaggregation of revenue from contracts with customers: Three Months Ended March 31, 2020 2019 Sales by Application Materials processing $ 218,074 $ 301,085 Other applications 31,168 13,962 Total $ 249,242 $ 315,047 Sales by Product High Power Continuous Wave ("CW") Lasers $ 119,316 $ 179,019 Medium Power CW Lasers 11,253 15,598 Pulsed Lasers 31,839 31,437 Quasi-Continuous Wave ("QCW") Lasers 9,873 14,166 Laser and Non-Laser Systems 18,634 32,631 Other Revenue including Amplifiers, Service, Parts, Accessories and Change in Deferred Revenue 58,327 42,196 Total $ 249,242 $ 315,047 Sales by Geography North America $ 67,339 $ 64,807 Europe: Germany 17,411 18,619 Other including Eastern Europe/CIS 57,232 69,200 Asia and Australia: China 68,599 114,366 Japan 13,685 15,614 Other 22,823 31,738 Rest of World 2,153 703 Total $ 249,242 $ 315,047 Timing of Revenue Recognition Goods and services transferred at a point in time $ 233,436 $ 292,093 Goods and services transferred over time 15,806 22,954 Total $ 249,242 $ 315,047 One of our customers accounted for 23% and 24% of our net accounts receivable as of March 31, 2020 and December 31, 2019, respectively. 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 are met. The Company bills customers for extended warranties upon entering into the agreement with the customer, resulting in deferred revenue. The timing of customer payments on contracts for the sale of customized robotic systems generally differs from the timing of revenue recognized, resulting in contract assets and liabilities. Contract assets are included within prepaid expense and other current assets on the condensed consolidated balance sheets. Contract liabilities are included within accrued expenses and other current liabilities on the condensed consolidated balance sheets. The following table reflects the changes in the Company's contract assets and liabilities for the three months ended March 31, 2020 and 2019: March 31, December 31, March 31, December 31, 2020 2019 Change 2019 2018 Change Contract assets Contract assets $ 8,646 $ 9,645 $ (999) $ 5,587 $ 10,102 $ (4,515) Contract liabilities Contract liabilities - current 62,499 59,531 2,968 55,237 52,606 2,631 Contract liabilities - long-term 2,377 1,820 557 1,649 1,413 236 During the three months ended March 31, 2020 and March 31, 2019 the Company recognized revenue of $14,995 and $25,160, respectively, that was included in contract liabilities at the beginning of each period. The Company has elected the practical expedient in ASC 606-10-50-14, whereby the performance obligations for contracts with an original expected duration of one year or less are not disclosed. The following table represents the Company's remaining performance obligations from contracts that are recognized over time as of March 31, 2020: Remaining Performance Obligations 2020 (a) 2021 2022 2023 2024 Thereafter Total Revenue expected to be recognized for extended warranty agreements $ 3,418 $ 1,421 $ 710 $ 474 $ 207 $ 41 $ 6,271 Revenue to be earned over time from contracts to sell robotic systems 19,637 6,868 — — — — 26,505 Total $ 23,055 $ 8,289 $ 710 $ 474 $ 207 $ 41 $ 32,776 (a) For the nine-month period beginning April 1, 2020.

Restricted Cash

Restricted Cash	3 Months Ended
	Mar. 31, 2020
Cash and Cash Equivalents [Abstract]
Restricted Cash	RESTRICTED CASH The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets to the total of the same amounts shown in the condensed consolidated statements of cash flows. March 31, December 31, 2020 2019 2019 2018 Cash and cash equivalents $ 570,058 $ 548,938 $ 680,070 $ 544,358 Restricted cash included in prepaid expenses and other current assets 2,283 — — — Restricted cash included in other assets — 2,866 2,914 — Cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows $ 572,341 $ 551,804 $ 682,984 $ 544,358

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS The Company's financial instruments consist of cash equivalents, short-term and long-term investments, accounts receivable, auction rate securities, accounts payable, drawings on revolving lines of credit, long-term debt, interest rate swaps and contingent purchase consideration. 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 Company classifies its financial instruments according to the prescribed criteria. The following table presents fair value information related to the Company's assets and liabilities measured at amortized cost on the condensed consolidated balance sheets with the exception of the interest rate swap, which is measured at fair value: Fair Value Measurements at March 31, 2020 Total Level 1 Level 2 Level 3 Assets Cash equivalents: Money market fund deposits and term deposits $ 82,922 $ 82,922 $ — $ — Commercial paper 65,689 — 65,689 — Corporate bonds 12,794 — 12,794 — Short-term investments: Corporate bonds 398,008 — 398,008 — Commercial paper 213,603 — 213,603 — Certificate of deposit 6,487 6,487 — — Municipal bonds 3,197 — 3,197 — U.S. Treasury and agency obligations 2,499 — 2,499 — Long-term investments and other assets: Auction rate securities 594 — — 594 Interest rate swap 59 — 59 — Total $ 785,852 $ 89,409 $ 695,849 $ 594 Liabilities Long-term debt $ 40,156 $ — $ 40,156 $ — Fair Value Measurements at December 31, 2019 Total Level 1 Level 2 Level 3 Assets Cash equivalents: Money market fund deposits and term deposits $ 155,080 $ 155,080 $ — $ — Commercial paper 54,712 — 54,712 — Short-term investments: Corporate bonds 259,422 259,422 — — Commercial paper 236,752 — 236,752 — Certificate of deposit 6,501 6,501 — — Long-term investments and other assets: Auction rate securities 592 — — 592 Interest rate swaps 13 — 13 — Total $ 713,072 $ 421,003 $ 291,477 $ 592 Liabilities Long-term debt $ 42,004 $ — $ 42,004 $ — Contingent purchase consideration 273 — — 273 Total $ 42,277 $ — $ 42,004 $ 273 The carrying amounts of money market fund deposits, term deposits, 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, 2020 and December 31, 2019, the Company's long-term notes consisted of a variable rate note and a fixed rate note, and are reported at amortized cost on the condensed consolidated balance sheets. For disclosure purposes, the fair value of the long-term notes was estimated using a discounted cash flow model using observable market interest rates and are classified as a level 2. Based on the discounted cash flow model, the fair value of the long-term notes at March 31, 2020 was $40,156 as compared to the book value of $40,779. At December 31, 2019, the book value approximated fair value. The fair value of the short-term investments considered held-to-maturity as of March 31, 2020 and December 31, 2019 was $623,794 and $502,675, respectively, which include an unrealized loss of $1,291 and unrealized gain of $129, respectively, as compared to the book value recorded on the condensed consolidated balance sheets for the same periods. There were no impairments for the investments considered held-to-maturity during the quarters ended March 31, 2020 and 2019. There were no current expected credit loss allowances for the investments considered held-to-maturity at March 31, 2020. The Company holds highly-rated held-to-maturity instruments that are within one year of maturity. The Company entered into an interest rate swap that is designated as a cash flow hedge 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 at March 31, 2020 for the interest rate swap considered pricing models whose inputs are observable for the securities held by the Company. Auction rate securities and contingent consideration are measured at fair value on a recurring basis using significant unobservable inputs (Level 3). 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 auction rate securities are considered available-for-sale securities. They had a cost basis of $594 and $592 at March 31, 2020 and December 31, 2019, respectively. There were no impairments for the investments considered available-for-sale during the quarters ended March 31, 2020 and 2019. The fair value of contingent consideration at December 31, 2019 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 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, 2020 2019 Auction rate securities Balance, beginning of period $ 592 $ 847 Change in fair value and accretion 2 3 Balance, end of period $ 594 $ 850 Contingent purchase consideration Balance, beginning of period $ 273 $ 898 Cash payments (272) (632) Foreign exchange adjustment (1) 28 Balance, end of period $ — $ 294 The following table presents the effective maturity dates of held-to-maturity and available-for-sale debt investments as of March 31, 2020 and December 31, 2019: March 31, 2020 December 31, 2019 Book Value Fair Value Book Value Fair Value Investment maturity Held-to-maturity: Less than 1 year $ 625,085 $ 623,794 $ 502,546 $ 502,675 Available-for-sale: Greater than 5 years $ 594 $ 594 $ 592 $ 592

Inventories

Inventories	3 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: March 31, December 31, 2020 2019 Components and raw materials $ 195,170 $ 200,390 Work-in-process 28,728 49,620 Finished components and devices 139,485 130,780 Total $ 363,383 $ 380,790 The Company recorded inventory provisions totaling $8,451 and $4,764 for the three months ended March 31, 2020 and 2019, 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, 2020
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: Three Months Ended March 31, 2020 2019 Balance at January 1 $ 82,092 $ 100,722 Goodwill arising from business combinations — 9,426 Adjustment to goodwill during measurement period — 448 Foreign exchange adjustment (465) (247) Balance at March 31 $ 81,627 $ 110,349 During the fourth quarter of 2018, the Company acquired 100% of the membership units of Genesis Systems Group, LLC ("Genesis"). During the first quarter of 2019, the working capital adjustment to the purchase price was finalized resulting in an increase in the purchase price of $448. The additional purchase price was allocated entirely to goodwill. During the first quarter of 2019, the Company acquired the submarine networks division (SND) of Padtec SA, a communications equipment company based in Brazil. SND is a provider of submarine networking technology and systems. The Company paid $19,560 to acquire SND, which represents the fair value on that date. Of the purchase price, $1,956 was held back for potential post-closing adjustments related to obtaining government approval of licenses. The hold-back was paid on February 28, 2020 for achieving the licensure milestone in the amount of $1,650, adjusted for foreign exchange rates. In addition, $2,934 ($2,283 at March 31, 2020) was held back in a restricted bank account for potential post-closing adjustments related to indemnities provided by the seller. The restricted cash balance is recorded in the condensed consolidated balance sheets as presented in Note 4. The liability related to the amount due to the sellers if the indemnities are satisfied is included within accrued expenses and other current liabilities as of March 31, 2020 and within deferred income taxes and other long-term liabilities at December 31, 2019 on the condensed consolidated balance sheets. Any excess of the purchase price was allocated to goodwill. In the second half of 2019, the Company undertook a strategic analysis of investments in new markets and solutions, including the additional investment required to enter and obtain significant market share in the submarine telecommunications industry. As a result of this analysis, in the fourth quarter of 2019, the Company decided to cease further investment in SND and is pursuing strategic alternatives for this business. As of December 31, 2019, the Company recognized a non-cash goodwill impairment loss of $17,795, which decreased the net assets to the estimated net realizable value. Intangible assets, subject to amortization, consisted of the following: March 31, 2020 December 31, 2019 Gross Accumulated Net Carrying Weighted- Average Lives Gross Carrying Accumulated Net Carrying Weighted- Customer relationships $ 57,730 $ (13,302) $ 44,428 11 years $ 57,866 $ (11,993) $ 45,873 11 years Technology, trademark and trade name 40,438 (16,873) 23,565 7 years 41,297 (16,128) 25,169 7 years Production know-how 9,150 (7,665) 1,485 7 years 9,180 (7,415) 1,765 7 years Patents 8,036 (6,682) 1,354 8 years 8,036 (6,572) 1,464 8 years Total $ 115,354 $ (44,522) $ 70,832 $ 116,379 $ (42,108) $ 74,271 Amortization expense for the three months ended March 31, 2020 and 2019 was $3,133 and $3,316, respectively. The estimated future amortization expense for intangibles for the remainder of 2020 and subsequent years is as follows: 2020 (a) 2021 2022 2023 2024 Thereafter Total $ 8,847 $ 11,605 10,669 $ 9,850 $ 7,500 $ 22,361 $ 70,832 (a) For the nine-month period beginning April 1, 2020.

Accrued Expenses And Other Liab

Accrued Expenses And Other Liabilities	3 Months Ended
	Mar. 31, 2020
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, 2020 2019 Accrued compensation $ 45,679 $ 48,881 Contract liabilities 62,499 59,531 Current portion of accrued warranty 24,057 23,114 Short-term lease liabilities 4,966 5,300 Other 11,470 12,956 Total $ 148,671 $ 149,782

Product Warranties

Product Warranties	3 Months Ended
	Mar. 31, 2020
Product Warranties Disclosures [Abstract]
Product Warranties	PRODUCT WARRANTIES The Company typically provides one The following table summarizes product warranty accrual activity recorded during the three months ended March 31, 2020 and 2019. 2020 2019 Balance at January 1 $ 48,866 $ 51,422 Provision for warranty accrual 5,001 4,358 Warranty claims (7,241) (4,839) Foreign currency translation (822) (392) Balance at March 31 $ 45,804 $ 50,549 Accrued warranty reported in the accompanying condensed consolidated financial statements as of March 31, 2020 and December 31, 2019 consisted of $24,057 and $23,114 in accrued expenses and other liabilities, respectively, and $21,747 and $25,752 in other long-term liabilities, respectively.

Financing Arrangements

Financing Arrangements	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Financing Arrangements	FINANCING ARRANGEMENTS The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2020 2019 Long-term notes $ 40,779 $ 41,708 Less: current portion (3,757) (3,740) Total long-term debt $ 37,022 $ 37,968 At March 31, 2020, the Company has an unsecured long-term note with an outstanding principal balance of $19,297, 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, 2020, the Company has another long-term note that is secured by its corporate aircraft with an outstanding principal balance of $21,482, of which, $2,569 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 future principal payments for the Company’s Notes as of March 31, 2020 are as follows: 2020 (a) $ 2,811 2021 3,810 2022 18,126 2023 16,032 Total $ 40,779 (a) For the nine-month period beginning April 1, 2020.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	DERIVATIVE FINANCIAL INSTRUMENTS The Company's only outstanding 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 condensed consolidated balance sheets were: Notional Amounts (1) Other Assets March 31, December 31, March 31, December 31, 2020 2019 2020 2019 $ 19,297 $ 19,594 $ 59 $ 13 (1) Notional amounts represent the gross contract/notional amount of the derivatives outstanding. The derivative gains and losses in the condensed consolidated financial statements for the three months ended March 31, 2020 and 2019, related to the Company's current and previous interest rate swap contracts were as follows: Three Months Ended March 31, 2020 2019 Effective portion recognized in other comprehensive income, pretax: Interest rate swap $ 46 $ (14)

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Commitments And Contingencies	COMMITMENTS AND CONTINGENCIESFrom 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, 2020 and through the filing date of these condensed consolidated financial statements, the Company has no legal proceedings ongoing that management estimates could have a material effect on the Company's condensed consolidated financial statements.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The effective tax rate for the three months ended March 31, 2020 and 2019 was 23.5% and 24.0%, respectively. There were discrete tax benefits of $2,787 and $2,338 for the three months ended March 31, 2020 and 2019, respectively, primarily related to the tax deductions for equity-based compensation that exceeded compensation expense recognized. The Company accounts for its uncertain tax positions in accordance with the accounting standards for income taxes. The Company continues to classify interest and penalties related to unrecognized tax benefits as a component of the provision for income taxes. The following is a summary of the activity of the Company’s unrecognized tax benefits for three months ended March 31, 2020 and 2019: 2020 2019 Balance at January 1, $ 11,416 $ 11,206 Additions for tax positions in current period 400 28 Foreign currency translation (1,101) 94 Balance at March 31, $ 10,715 $ 11,328

Net Income Attributable To IPG

Net Income Attributable To IPG Photonics Corporation Per Share	3 Months Ended
	Mar. 31, 2020
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, 2020 2019 Net income attributable to IPG Photonics Corporation $ 36,403 $ 55,159 Net income attributable to common stockholders 36,403 55,159 Weighted average shares 53,075 53,001 Dilutive effect of common stock equivalents 601 873 Diluted weighted average common shares 53,676 53,874 Basic net income attributable to IPG Photonics Corporation per share $ 0.69 $ 1.04 Basic net income attributable to common stockholders $ 0.69 $ 1.04 Diluted net income attributable to IPG Photonics Corporation per share $ 0.68 $ 1.02 Diluted net income attributable to common stockholders $ 0.68 $ 1.02 For the three months ended March 31, 2020 and 2019, respectively, the computation of diluted weighted average common shares excludes 871,000 and 631,100 common stock equivalents because the effect of including them would be anti-dilutive. The shares excluded for the three months ended March 31, 2020 and 2019, respectively are comprised of 198,000 and 123,600 restricted stock units ("RSUs") and 50,300 and 31,400 performance stock units ("PSUs"), and 622,700 and 476,100 non-qualified stock options, respectively. On February 12, 2019, the Company announced that its Board of Directors authorized the purchase of up to $125,000 of IPG common stock following the completion of its $125,000 repurchase program authorized in July 2018. Under the program, IPG is authorized to repurchase shares of common stock in an amount not to exceed the lesser of (a) the number of shares issued to employees and directors under the Company's various employee and director equity compensation and employee stock purchase plans from January 1, 2019 through December 31, 2020 and (b) $125,000, exclusive of any fees, commissions or other

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2020
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTSThe Company has evaluated subsequent events through the time of filing this Quarterly Report on Form 10-Q with the SEC. On April 22, 2020, IPG Laser GmbH ("IPG Laser"), a wholly-owned subsidiary of the Company, entered into the First Amendment to Credit Facility Agreement dated April 20, 2020 with Deutsche Bank AG ("Deutsche Bank") to extend the term of its existing unsecured revolving line of credit dated July 27, 2017 with Deutsche Bank (the "Credit Facility Agreement"). The term of the Credit Facility Agreement has been extended to July 31, 2023 from its original expiration date of July 31, 2020. IPG Laser, located in Burbach, Germany, is one of the Company's principal manufacturing, research and sales operations. The Company guarantees the obligations of IPG Laser under the Credit Facility Agreement.On May 5, 2020, IPG announced that its Board of Directors has authorized the purchase of up to $200 million of IPG common stock. This new authorization is additive to the Company's existing $125 million stock repurchase program authorized in February 2019, under which approximately $60 million remains available for repurchase increasing the total repurchase program to $260 million. Share repurchases may be made periodically in open-market transactions, and are subject to market conditions, legal requirements and other factors. The share repurchase program authorization does not obligate the Company to repurchase any dollar amount or number of its shares, and repurchases may be commenced or suspended from time to time without prior notice.

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation — The accompanying unaudited condensed 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 condensed consolidated financial statements include the Company's accounts and those of its subsidiaries. All intercompany balances have been eliminated in consolidation. These condensed 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, 2019.
Accounts Receivable and Allowance for Doubtful Accounts	Accounts Receivable and Allowance for Doubtful Accounts — The Company maintains an allowance for doubtful accounts to provide for the estimated amount of accounts receivable that will not be collected. The allowance is based upon an estimate of expected credit losses over the life of outstanding receivables. The estimate involves an assessment of customer creditworthiness, historical payment experience, an assumption of future expected credit losses, and the age of outstanding receivables.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS Adopted Pronouncements — In June 2016, the FASB issued ASU No. 2016-13, "Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13"), which adds an impairment model (known as the current expected credit loss ("CECL") model) that is based on expected losses rather than incurred losses. Under the new guidance, an entity recognizes as an allowance its estimate of expected credit losses, which the FASB believes will result in more timely recognition of such losses. The ASU is also intended to reduce the complexity by decreasing the number of credit impairment models that entities use to account for debt instruments. The Company adopted ASU 2016-03, along with its subsequent clarifications, as of January 1, 2020. The cumulative effect of the changes made to the Company's condensed consolidated January 1, 2020 balance sheet for the adoption of ASU 2016-13 was as follows: Balance at Adoption of Balance at December 31, 2019 ASU 2016-13 January 1, 2020 Balance Sheet Accounts receivable, net $ 238,479 $ (148) $ 238,331 Deferred income taxes, net 31,395 33 31,428 Retained earnings 2,028,734 (115) 2,028,619

Basis Of Presentation And Sig_2

Basis Of Presentation And Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Allowance for Doubtful Accounts	Activity related to the allowance for doubtful accounts was as follows: Three Months Ended March 31, 2020 2019 Balance at January 1 $ 2,547 $ 1,799 Provision for bad debts, net of recoveries (187) 518 Foreign currency translation (225) (21) Balance at March 31 $ 2,135 $ 2,296

Recent Accounting Pronounceme_3

Recent Accounting Pronouncements (Tables)	3 Months Ended
	Mar. 31, 2020
Accounting Policies [Abstract]
Cumulative Effect of Change to Balance Sheet	The cumulative effect of the changes made to the Company's condensed consolidated January 1, 2020 balance sheet for the adoption of ASU 2016-13 was as follows: Balance at Adoption of Balance at December 31, 2019 ASU 2016-13 January 1, 2020 Balance Sheet Accounts receivable, net $ 238,479 $ (148) $ 238,331 Deferred income taxes, net 31,395 33 31,428 Retained earnings 2,028,734 (115) 2,028,619

Revenue From Contracts With C_2

Revenue From Contracts With Customers (Tables)	3 Months Ended
	Mar. 31, 2020
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables represent a disaggregation of revenue from contracts with customers: Three Months Ended March 31, 2020 2019 Sales by Application Materials processing $ 218,074 $ 301,085 Other applications 31,168 13,962 Total $ 249,242 $ 315,047 Sales by Product High Power Continuous Wave ("CW") Lasers $ 119,316 $ 179,019 Medium Power CW Lasers 11,253 15,598 Pulsed Lasers 31,839 31,437 Quasi-Continuous Wave ("QCW") Lasers 9,873 14,166 Laser and Non-Laser Systems 18,634 32,631 Other Revenue including Amplifiers, Service, Parts, Accessories and Change in Deferred Revenue 58,327 42,196 Total $ 249,242 $ 315,047 Sales by Geography North America $ 67,339 $ 64,807 Europe: Germany 17,411 18,619 Other including Eastern Europe/CIS 57,232 69,200 Asia and Australia: China 68,599 114,366 Japan 13,685 15,614 Other 22,823 31,738 Rest of World 2,153 703 Total $ 249,242 $ 315,047 Timing of Revenue Recognition Goods and services transferred at a point in time $ 233,436 $ 292,093 Goods and services transferred over time 15,806 22,954 Total $ 249,242 $ 315,047
Changes in Contract Assets and Liabilities	The following table reflects the changes in the Company's contract assets and liabilities for the three months ended March 31, 2020 and 2019: March 31, December 31, March 31, December 31, 2020 2019 Change 2019 2018 Change Contract assets Contract assets $ 8,646 $ 9,645 $ (999) $ 5,587 $ 10,102 $ (4,515) Contract liabilities Contract liabilities - current 62,499 59,531 2,968 55,237 52,606 2,631 Contract liabilities - long-term 2,377 1,820 557 1,649 1,413 236
Schedule of Remaining Performance Obligations	The following table represents the Company's remaining performance obligations from contracts that are recognized over time as of March 31, 2020: Remaining Performance Obligations 2020 (a) 2021 2022 2023 2024 Thereafter Total Revenue expected to be recognized for extended warranty agreements $ 3,418 $ 1,421 $ 710 $ 474 $ 207 $ 41 $ 6,271 Revenue to be earned over time from contracts to sell robotic systems 19,637 6,868 — — — — 26,505 Total $ 23,055 $ 8,289 $ 710 $ 474 $ 207 $ 41 $ 32,776 (a) For the nine-month period beginning April 1, 2020.

Restricted Cash (Tables)

Restricted Cash (Tables)	3 Months Ended
	Mar. 31, 2020
Cash and Cash Equivalents [Abstract]
Schedule of Cash and Cash Equivalents	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets to the total of the same amounts shown in the condensed consolidated statements of cash flows. March 31, December 31, 2020 2019 2019 2018 Cash and cash equivalents $ 570,058 $ 548,938 $ 680,070 $ 544,358 Restricted cash included in prepaid expenses and other current assets 2,283 — — — Restricted cash included in other assets — 2,866 2,914 — Cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows $ 572,341 $ 551,804 $ 682,984 $ 544,358
Schedule of Restricted Cash	The following table provides a reconciliation of cash, cash equivalents and restricted cash reported within the condensed consolidated balance sheets to the total of the same amounts shown in the condensed consolidated statements of cash flows. March 31, December 31, 2020 2019 2019 2018 Cash and cash equivalents $ 570,058 $ 548,938 $ 680,070 $ 544,358 Restricted cash included in prepaid expenses and other current assets 2,283 — — — Restricted cash included in other assets — 2,866 2,914 — Cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows $ 572,341 $ 551,804 $ 682,984 $ 544,358

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2020
Fair Value Disclosures [Abstract]
Assets And Liabilities Measured At Fair Value	The following table presents fair value information related to the Company's assets and liabilities measured at amortized cost on the condensed consolidated balance sheets with the exception of the interest rate swap, which is measured at fair value: Fair Value Measurements at March 31, 2020 Total Level 1 Level 2 Level 3 Assets Cash equivalents: Money market fund deposits and term deposits $ 82,922 $ 82,922 $ — $ — Commercial paper 65,689 — 65,689 — Corporate bonds 12,794 — 12,794 — Short-term investments: Corporate bonds 398,008 — 398,008 — Commercial paper 213,603 — 213,603 — Certificate of deposit 6,487 6,487 — — Municipal bonds 3,197 — 3,197 — U.S. Treasury and agency obligations 2,499 — 2,499 — Long-term investments and other assets: Auction rate securities 594 — — 594 Interest rate swap 59 — 59 — Total $ 785,852 $ 89,409 $ 695,849 $ 594 Liabilities Long-term debt $ 40,156 $ — $ 40,156 $ — Fair Value Measurements at December 31, 2019 Total Level 1 Level 2 Level 3 Assets Cash equivalents: Money market fund deposits and term deposits $ 155,080 $ 155,080 $ — $ — Commercial paper 54,712 — 54,712 — Short-term investments: Corporate bonds 259,422 259,422 — — Commercial paper 236,752 — 236,752 — Certificate of deposit 6,501 6,501 — — Long-term investments and other assets: Auction rate securities 592 — — 592 Interest rate swaps 13 — 13 — Total $ 713,072 $ 421,003 $ 291,477 $ 592 Liabilities Long-term debt $ 42,004 $ — $ 42,004 $ — Contingent purchase consideration 273 — — 273 Total $ 42,277 $ — $ 42,004 $ 273
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, 2020 2019 Auction rate securities Balance, beginning of period $ 592 $ 847 Change in fair value and accretion 2 3 Balance, end of period $ 594 $ 850 Contingent purchase consideration Balance, beginning of period $ 273 $ 898 Cash payments (272) (632) Foreign exchange adjustment (1) 28 Balance, end of period $ — $ 294
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, 2020 2019 Auction rate securities Balance, beginning of period $ 592 $ 847 Change in fair value and accretion 2 3 Balance, end of period $ 594 $ 850 Contingent purchase consideration Balance, beginning of period $ 273 $ 898 Cash payments (272) (632) Foreign exchange adjustment (1) 28 Balance, end of period $ — $ 294
Schedule of Effective Maturity Dates of Held To Maturity Investments	The following table presents the effective maturity dates of held-to-maturity and available-for-sale debt investments as of March 31, 2020 and December 31, 2019: March 31, 2020 December 31, 2019 Book Value Fair Value Book Value Fair Value Investment maturity Held-to-maturity: Less than 1 year $ 625,085 $ 623,794 $ 502,546 $ 502,675 Available-for-sale: Greater than 5 years $ 594 $ 594 $ 592 $ 592

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2020
Inventory Disclosure [Abstract]
Components of Inventories	Inventories consist of the following: March 31, December 31, 2020 2019 Components and raw materials $ 195,170 $ 200,390 Work-in-process 28,728 49,620 Finished components and devices 139,485 130,780 Total $ 363,383 $ 380,790

Goodwill And Intangibles (Table

Goodwill And Intangibles (Tables)	3 Months Ended
	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table sets forth the changes in the carrying amount of goodwill: Three Months Ended March 31, 2020 2019 Balance at January 1 $ 82,092 $ 100,722 Goodwill arising from business combinations — 9,426 Adjustment to goodwill during measurement period — 448 Foreign exchange adjustment (465) (247) Balance at March 31 $ 81,627 $ 110,349
Schedule of Intangible Assets	Intangible assets, subject to amortization, consisted of the following: March 31, 2020 December 31, 2019 Gross Accumulated Net Carrying Weighted- Average Lives Gross Carrying Accumulated Net Carrying Weighted- Customer relationships $ 57,730 $ (13,302) $ 44,428 11 years $ 57,866 $ (11,993) $ 45,873 11 years Technology, trademark and trade name 40,438 (16,873) 23,565 7 years 41,297 (16,128) 25,169 7 years Production know-how 9,150 (7,665) 1,485 7 years 9,180 (7,415) 1,765 7 years Patents 8,036 (6,682) 1,354 8 years 8,036 (6,572) 1,464 8 years Total $ 115,354 $ (44,522) $ 70,832 $ 116,379 $ (42,108) $ 74,271
Estimated Future Amortization Expense For Intangibles	The estimated future amortization expense for intangibles for the remainder of 2020 and subsequent years is as follows: 2020 (a) 2021 2022 2023 2024 Thereafter Total $ 8,847 $ 11,605 10,669 $ 9,850 $ 7,500 $ 22,361 $ 70,832 (a) For the nine-month period beginning April 1, 2020.

Accrued Expenses And Other Li_2

Accrued Expenses And Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2020
Payables and Accruals [Abstract]
Components of Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consist of the following: March 31, December 31, 2020 2019 Accrued compensation $ 45,679 $ 48,881 Contract liabilities 62,499 59,531 Current portion of accrued warranty 24,057 23,114 Short-term lease liabilities 4,966 5,300 Other 11,470 12,956 Total $ 148,671 $ 149,782

Product Warranties (Tables)

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2020
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, 2020 and 2019. 2020 2019 Balance at January 1 $ 48,866 $ 51,422 Provision for warranty accrual 5,001 4,358 Warranty claims (7,241) (4,839) Foreign currency translation (822) (392) Balance at March 31 $ 45,804 $ 50,549

Financing Arrangements (Tables)

Financing Arrangements (Tables)	3 Months Ended
	Mar. 31, 2020
Debt Disclosure [Abstract]
Borrowings Under Existing Financing Arrangements	The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2020 2019 Long-term notes $ 40,779 $ 41,708 Less: current portion (3,757) (3,740) Total long-term debt $ 37,022 $ 37,968
Schedule of Future Principal Payments	The future principal payments for the Company’s Notes as of March 31, 2020 are as follows: 2020 (a) $ 2,811 2021 3,810 2022 18,126 2023 16,032 Total $ 40,779 (a) For the nine-month period beginning April 1, 2020.

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2020
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair Value of Derivatives	The fair value amounts in the condensed consolidated balance sheets were: Notional Amounts (1) Other Assets March 31, December 31, March 31, December 31, 2020 2019 2020 2019 $ 19,297 $ 19,594 $ 59 $ 13 (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 condensed consolidated financial statements for the three months ended March 31, 2020 and 2019, related to the Company's current and previous interest rate swap contracts were as follows: Three Months Ended March 31, 2020 2019 Effective portion recognized in other comprehensive income, pretax: Interest rate swap $ 46 $ (14)

Income Taxes (Tables)

Income Taxes (Tables)	3 Months Ended
	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Schedule of Unrecognized Tax Benefits	The following is a summary of the activity of the Company’s unrecognized tax benefits for three months ended March 31, 2020 and 2019: 2020 2019 Balance at January 1, $ 11,416 $ 11,206 Additions for tax positions in current period 400 28 Foreign currency translation (1,101) 94 Balance at March 31, $ 10,715 $ 11,328

Net Income Attributable To IP_2

Net Income Attributable To IPG Photonics Corporation Per Share (Tables)	3 Months Ended
	Mar. 31, 2020
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, 2020 2019 Net income attributable to IPG Photonics Corporation $ 36,403 $ 55,159 Net income attributable to common stockholders 36,403 55,159 Weighted average shares 53,075 53,001 Dilutive effect of common stock equivalents 601 873 Diluted weighted average common shares 53,676 53,874 Basic net income attributable to IPG Photonics Corporation per share $ 0.69 $ 1.04 Basic net income attributable to common stockholders $ 0.69 $ 1.04 Diluted net income attributable to IPG Photonics Corporation per share $ 0.68 $ 1.02 Diluted net income attributable to common stockholders $ 0.68 $ 1.02

Basis Of Presentation And Sig_3

Basis Of Presentation And Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at January 1	$ 2,547	$ 1,799
Provision for bad debts, net of recoveries	(187)	518
Foreign currency translation	(225)	(21)
Balance at March 31	$ 2,135	$ 2,296

Recent Accounting Pronounceme_4

Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net	$ 200,646	$ 238,331	$ 238,479
Deferred income taxes, net	32,801	31,428	31,395
Retained earnings	$ 2,065,022	2,028,619	$ 2,028,734
ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Accounts receivable, net		(148)
Deferred income taxes, net		33
Retained earnings		$ (115)

Revenue From Contracts With C_3

Revenue From Contracts With Customers (Disaggregation of Revenue, By Application) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Sales by Application
Total	$ 249,242	$ 315,047
Materials processing
Sales by Application
Total	218,074	301,085
Other applications
Sales by Application
Total	$ 31,168	$ 13,962

Revenue From Contracts With C_4

Revenue From Contracts With Customers (Disaggregation of Revenue, By Product) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue [Line Items]
Total	$ 249,242	$ 315,047
High Power Continuous Wave ("CW") Lasers
Disaggregation of Revenue [Line Items]
Total	119,316	179,019
Medium Power CW Lasers
Disaggregation of Revenue [Line Items]
Total	11,253	15,598
Pulsed Lasers
Disaggregation of Revenue [Line Items]
Total	31,839	31,437
Quasi-Continuous Wave ("QCW") Lasers
Disaggregation of Revenue [Line Items]
Total	9,873	14,166
Laser and Non-Laser Systems
Disaggregation of Revenue [Line Items]
Total	18,634	32,631
Other Revenue including Amplifiers, Service, Parts, Accessories and Change in Deferred Revenue
Disaggregation of Revenue [Line Items]
Total	$ 58,327	$ 42,196

Revenue From Contracts With C_5

Revenue From Contracts With Customers (Disaggregation of Revenue, By Geography) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Sales by Geography
Total	$ 249,242	$ 315,047
North America
Sales by Geography
Total	67,339	64,807
Germany
Sales by Geography
Total	17,411	18,619
Other including Eastern Europe/CIS
Sales by Geography
Total	57,232	69,200
China
Sales by Geography
Total	68,599	114,366
Japan
Sales by Geography
Total	13,685	15,614
Other
Sales by Geography
Total	22,823	31,738
Rest of World
Sales by Geography
Total	$ 2,153	$ 703

Revenue From Contracts With C_6

Revenue From Contracts With Customers (Disaggregation of Revenue, By Timing) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Timing of Revenue Recognition
Total	$ 249,242	$ 315,047
Goods and services transferred at a point in time
Timing of Revenue Recognition
Total	233,436	292,093
Goods and services transferred over time
Timing of Revenue Recognition
Total	$ 15,806	$ 22,954

Revenue From Contracts With C_7

Revenue From Contracts With Customers (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Concentration Risk [Line Items]
Revenue recognized that was included in the contract liability balance at the beginning of the period	$ 14,995	$ 25,160
One Customer | Customer Concentration Risk | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage	23.00%		24.00%

Revenue From Contracts With C_8

Revenue From Contracts With Customers (Changes in Contract Assets and Contract Liabilities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Contract assets
Contract assets	$ 8,646	$ 5,587	$ 9,645	$ 10,102
Contract assets, change	(999)	(4,515)
Contract liabilities
Contract liabilities - current	62,499	55,237	59,531	52,606
Contract liabilities - current, change	2,968	2,631
Contract liabilities - long-term	2,377	1,649	$ 1,820	$ 1,413
Contract liabilities - long-term, change	$ 557	$ 236

Revenue From Contracts With C_9

Revenue From Contracts With Customers (Schedule of Remaining Performance Obligations) (Details) $ in Thousands	Mar. 31, 2020USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 32,776
Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	6,271
Revenue to be earned over time from contracts to sell robotic systems
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	26,505
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	$ 23,055
Remaining performance obligations, expected timing	9 months
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	$ 3,418
Remaining performance obligations, expected timing	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01 | Revenue to be earned over time from contracts to sell robotic systems
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 19,637
Remaining performance obligations, expected timing	9 months
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	$ 8,289
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	$ 1,421
Remaining performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01 | Revenue to be earned over time from contracts to sell robotic systems
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 6,868
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	$ 710
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	$ 710
Remaining performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-04-01 | Revenue to be earned over time from contracts to sell robotic systems
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, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 474
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	$ 474
Remaining performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-04-01 | Revenue to be earned over time from contracts to sell robotic systems
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]: 2024-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 207
Remaining performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 207
Remaining performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-04-01 | Revenue to be earned over time from contracts to sell robotic systems
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]: 2025-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 41
Remaining performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Revenue expected to be recognized for extended warranty agreements
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 41
Remaining performance obligations, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 | Revenue to be earned over time from contracts to sell robotic systems
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Remaining performance obligations	$ 0
Remaining performance obligations, expected timing	1 year

Restricted Cash (Details)

Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 570,058	$ 680,070	$ 548,938	$ 544,358
Restricted cash included in prepaid expenses and other current assets	2,283	0	0	0
Restricted cash included in other assets	0	2,914	2,866	0
Cash, cash equivalents and restricted cash in the condensed consolidated statements of cash flows	$ 572,341	$ 682,984	$ 551,804	$ 544,358

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Assets
Total	$ 785,852	$ 713,072
Liabilities
Long-term debt	40,156	42,004
Contingent purchase consideration		273
Total		42,277
Level 1
Assets
Total	89,409	421,003
Liabilities
Long-term debt	0	0
Contingent purchase consideration		0
Total		0
Level 2
Assets
Total	695,849	291,477
Liabilities
Long-term debt	40,156	42,004
Contingent purchase consideration		0
Total		42,004
Level 3
Assets
Total	594	592
Liabilities
Long-term debt	0	0
Contingent purchase consideration		273
Total		273
Money market fund deposits and term deposits
Assets
Cash equivalents	82,922	155,080
Money market fund deposits and term deposits | Level 1
Assets
Cash equivalents	82,922	155,080
Money market fund deposits and term deposits | Level 2
Assets
Cash equivalents	0	0
Money market fund deposits and term deposits | Level 3
Assets
Cash equivalents	0	0
Commercial paper
Assets
Cash equivalents	65,689	54,712
Commercial paper | Level 1
Assets
Cash equivalents	0	0
Commercial paper | Level 2
Assets
Cash equivalents	65,689	54,712
Commercial paper | Level 3
Assets
Cash equivalents	0	0
Corporate bonds
Assets
Cash equivalents	12,794
Short-term investments	398,008	259,422
Corporate bonds | Level 1
Assets
Cash equivalents	0
Short-term investments	0	259,422
Corporate bonds | Level 2
Assets
Cash equivalents	12,794
Short-term investments	398,008	0
Corporate bonds | Level 3
Assets
Cash equivalents	0
Short-term investments	0	0
Commercial paper
Assets
Short-term investments	213,603	236,752
Commercial paper | Level 1
Assets
Short-term investments	0	0
Commercial paper | Level 2
Assets
Short-term investments	213,603	236,752
Commercial paper | Level 3
Assets
Short-term investments	0	0
Certificate of deposit
Assets
Short-term investments	6,487	6,501
Certificate of deposit | Level 1
Assets
Short-term investments	6,487	6,501
Certificate of deposit | Level 2
Assets
Short-term investments	0	0
Certificate of deposit | Level 3
Assets
Short-term investments	0	0
Municipal bonds
Assets
Short-term investments	3,197
Municipal bonds | Level 1
Assets
Short-term investments	0
Municipal bonds | Level 2
Assets
Short-term investments	3,197
Municipal bonds | Level 3
Assets
Short-term investments	0
U.S. Treasury and agency obligations
Assets
Short-term investments	2,499
U.S. Treasury and agency obligations | Level 1
Assets
Short-term investments	0
U.S. Treasury and agency obligations | Level 2
Assets
Short-term investments	2,499
U.S. Treasury and agency obligations | Level 3
Assets
Short-term investments	0
Auction rate securities
Assets
Long-term investments and other assets	594	592
Auction rate securities | Level 1
Assets
Long-term investments and other assets	0	0
Auction rate securities | Level 2
Assets
Long-term investments and other assets	0	0
Auction rate securities | Level 3
Assets
Long-term investments and other assets	594	592
Interest rate swap
Assets
Long-term investments and other assets	59	13
Interest rate swap | Level 1
Assets
Long-term investments and other assets	0	0
Interest rate swap | Level 2
Assets
Long-term investments and other assets	59	13
Interest rate swap | Level 3
Assets
Long-term investments and other assets	$ 0	$ 0

Fair Value Measurements (Narrat

Fair Value Measurements (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	$ 785,852	$ 713,072
Held-to-maturity Securities | Short-term Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets fair value	623,794	502,675
Unrealized gain (loss)	(1,291)	129
Available-for-sale Securities | Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale securities, cost basis	$ 594	$ 592

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, 2020	Mar. 31, 2019
Auction rate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 592	$ 847
Change in fair value and accretion	2	3
Balance, end of period	594	850
Contingent purchase consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	273	898
Cash payments	(272)	(632)
Foreign exchange adjustment	(1)	28
Balance, end of period	$ 0	$ 294

Fair Value Measurements (Schedu

Fair Value Measurements (Schedule of Effective Maturity Dates of Held To Maturity Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investment maturity
Held-to-maturity maturities, Less than 1 year, Book Value	$ 625,085	$ 502,546
Held-to-maturity maturities, Less than 1 year, Fair Value	623,794	502,675
Available-for-sale maturity, Greater than 5 years, Book Value	594	592
Available-for-sale maturity, Greater than 5 years, Fair Value	$ 594	$ 592

Inventories (Components Of Inve

Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Components and raw materials	$ 195,170	$ 200,390
Work-in-process	28,728	49,620
Finished components and devices	139,485	130,780
Total	$ 363,383	$ 380,790

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Inventory Disclosure [Abstract]
Inventory provisions	$ 8,451	$ 4,764

Goodwill And Intangibles (Sched

Goodwill And Intangibles (Schedule of Changes) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Goodwill [Roll Forward]
Balance at January 1	$ 82,092	$ 100,722
Goodwill arising from business combinations	0	9,426
Adjustment to goodwill during measurement period	0	448
Foreign exchange adjustment	(465)	(247)
Balance at March 31	$ 81,627	$ 110,349

Goodwill And Intangibles (Narra

Goodwill And Intangibles (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Amortization expense	$ 3,133	$ 3,316
Genesis Systems Group
Business Acquisition [Line Items]
Percentage of business acquired				100.00%
Working capital adjustment		448
Padtec SA, Submarine Networks Division
Business Acquisition [Line Items]
Purchase price		19,560
Restricted cash	2,283	2,934
Goodwill impairment			$ 17,795
Licenses | Padtec SA, Submarine Networks Division
Business Acquisition [Line Items]
Restricted cash	$ 1,650	$ 1,956

Goodwill And Intangibles (Intan

Goodwill And Intangibles (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 115,354	$ 116,379
Accumulated Amortization	(44,522)	(42,108)
Net  Carrying Amount	70,832	74,271
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	57,730	57,866
Accumulated Amortization	(13,302)	(11,993)
Net  Carrying Amount	$ 44,428	$ 45,873
Weighted-Average Lives	11 years	11 years
Technology, trademark and trade name
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 40,438	$ 41,297
Accumulated Amortization	(16,873)	(16,128)
Net  Carrying Amount	$ 23,565	$ 25,169
Weighted-Average Lives	7 years	7 years
Production know-how
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 9,150	$ 9,180
Accumulated Amortization	(7,665)	(7,415)
Net  Carrying Amount	$ 1,485	$ 1,765
Weighted-Average Lives	7 years	7 years
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,036	$ 8,036
Accumulated Amortization	(6,682)	(6,572)
Net  Carrying Amount	$ 1,354	$ 1,464
Weighted-Average Lives	8 years	8 years

Goodwill And Intangibles (Estim

Goodwill And Intangibles (Estimated Future Amortization Expense For Intangibles) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]
2020	$ 8,847
2021	11,605
2022	10,669
2023	9,850
2024	7,500
Thereafter	22,361
Net  Carrying Amount	$ 70,832	$ 74,271

Accrued Expenses And Other Li_3

Accrued Expenses And Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Payables and Accruals [Abstract]
Accrued compensation	$ 45,679	$ 48,881
Contract liabilities	62,499	59,531	$ 55,237	$ 52,606
Current portion of accrued warranty	24,057	23,114
Short-term lease liabilities	4,966	5,300
Other	11,470	12,956
Total	$ 148,671	$ 149,782

Product Warranties (Narrative)

Product Warranties (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Product Warranty Liability [Line Items]
Accrued warranty reported in accrued expenses and other liabilities	$ 24,057	$ 23,114
Accrued warranty reported in other long-term liabilities	$ 21,747	$ 25,752
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	5 years

Product Warranties (Summary Of

Product Warranties (Summary Of Product Warranty Activity) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 48,866	$ 51,422
Provision for warranty accrual	5,001	4,358
Warranty claims	(7,241)	(4,839)
Foreign currency translation	(822)	(392)
Balance at March 31	$ 45,804	$ 50,549

Financing Arrangements (Borrowi

Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
Long-term notes	$ 40,779	$ 41,708
Less: current portion	(3,757)	(3,740)
Total long-term debt	$ 37,022	$ 37,968

Financing Arrangements (Narrati

Financing Arrangements (Narrative) (Details) € in Thousands	3 Months Ended
	Mar. 31, 2020EUR (€)	May 31, 2023USD ($)	Jul. 31, 2022USD ($)	Mar. 31, 2020USD ($)	Mar. 25, 2020USD ($)	Dec. 31, 2019USD ($)
Debt Instrument [Line Items]
Total unused credit lines and overdraft facilities				$ 129,172,000
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%			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				$ 21,482,000
Current portion of long-term note				$ 2,569,000
Fixed interest rate swap	2.74%			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				$ 19,297,000
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				1,137,000		1,426,000
Euro line-of-credit
Debt Instrument [Line Items]
Line of credit				0		0
Guarantees issued				1,889,000		1,422,000
Euro overdraft facility
Debt Instrument [Line Items]
Line of credit				0		$ 0
Letter of Credit | U.S. line-of-credit
Debt Instrument [Line Items]
Increase in borrowing capacity					$ 25,000,000
Borrowing capacity				75,000,000
Letter of Credit | Euro line-of-credit
Debt Instrument [Line Items]
Borrowing capacity	€ 50,000			54,998,000
Letter of Credit | Euro overdraft facility
Debt Instrument [Line Items]
Borrowing capacity	€ 2,000			$ 2,200,000

Financing Arrangements (Future

Financing Arrangements (Future Principal Payments) (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Disclosure [Abstract]
2020	$ 2,811
2021	3,810
2022	18,126
2023	16,032
Long-term notes	$ 40,779	$ 41,708

Derivative Financial Instrume_3

Derivative Financial Instruments (Fair Value) (Details) - Derivative designated as a cash flow hedge - Interest rate swap - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Derivative, notional amount	$ 19,297,000	$ 19,594,000
Other Assets
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	$ 59,000	$ 13,000

Derivative Financial Instrume_4

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, 2020	Mar. 31, 2019
Interest rate swap | Derivative designated as a cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion recognized in other comprehensive income, pretax	$ 46	$ (14)

Commitments And Contingencies (

Commitments And Contingencies (Details)	Mar. 31, 2020USD ($)
Commitments and Contingencies Disclosure [Abstract]
Legal proceedings	$ 0

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Effective tax rate	23.50%	24.00%
Discrete tax expense (benefit)	$ (2,787)	$ (2,338)

Income Taxes (Schedule of Unrec

Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1,	$ 11,416	$ 11,206
Additions for tax positions in current period	400	28
Foreign currency translation	(1,101)
Foreign currency translation		94
Balance at March 31,	$ 10,715	$ 11,328

Net Income Attributable To IP_3

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, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to IPG Photonics Corporation	$ 36,403	$ 55,159
Net income attributable to common stockholders	$ 36,403	$ 55,159
Weighted average shares (in shares)	53,075	53,001
Dilutive effect of common stock equivalents (in shares)	601	873
Diluted weighted average common shares (in shares)	53,676	53,874
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 0.69	$ 1.04
Basic net income attributable to common stockholders (in dollars per share)	0.69	1.04
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share)	0.68	1.02
Diluted net income attributable to common stockholders (in dollars per share)	$ 0.68	$ 1.02

Net Income Attributable to IP_4

Net Income Attributable to IPG Photonics Corporation Per Share (Narrative) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Feb. 29, 2020	Feb. 12, 2019	Jul. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	871,000	631,100
Decrease in weighted average shares outstanding, treasury stock (in shares)	25,875
2018 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share repurchase authorized amount					$ 125,000,000
2019 Program
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Share repurchase authorized amount			$ 125,000,000	$ 125,000,000
Stock repurchased during period (in shares)	108,819
Stock repurchase average price (in dollars per share)	$ 116.85
Remaining repurchase amount	$ 71,552,000
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)	198,000	123,600
Performance Stock Units, PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Excluded from computation of diluted weighted average common shares (in shares)	50,300	31,400
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)	622,700	476,100

Subsequent Events (Details)

Subsequent Events (Details) - USD ($)	May 05, 2020	Mar. 31, 2020	Feb. 29, 2020	Feb. 12, 2019
Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorized amount	$ 260,000,000
2020 Program | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorized amount	200,000,000
2019 Program
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorized amount			$ 125,000,000	$ 125,000,000
Remaining repurchase amount		$ 71,552,000
2019 Program | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining repurchase amount	$ 60,000,000

Uncategorized Items - ipgp-2020

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (115,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (115,000)