IPG Photonics (IPGP) 10-Q 8 Aug 16 2016 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Aug. 04, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2,016
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		53,152,883

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 587,286	$ 582,532
Short-term investments	126,794	106,584
Accounts receivable, net	151,476	150,479
Inventories	241,282	203,738
Prepaid income taxes	32,890	33,692
Prepaid expenses and other current assets	33,042	25,564
Deferred income taxes, net	24,477	20,346
Total current assets	1,197,247	1,122,935
DEFERRED INCOME TAXES, NET	13,438	9,386
GOODWILL	20,461	505
INTANGIBLE ASSETS, NET	29,396	11,904
PROPERTY, PLANT AND EQUIPMENT, NET	350,432	288,604
OTHER ASSETS	18,333	20,095
TOTAL	1,629,307	1,453,429
CURRENT LIABILITIES:
Current portion of long-term debt	3,188	2,000
Accounts payable	20,414	26,314
Accrued expenses and other liabilities	80,534	75,667
Deferred income taxes, net	4,152	3,190
Income taxes payable	26,688	37,809
Total current liabilities	134,976	144,980
DEFERRED INCOME TAXES AND OTHER LONG-TERM LIABILITIES	31,939	30,117
LONG-TERM DEBT, NET OF CURRENT PORTION	39,229	17,667
Total liabilities	206,144	192,764
COMMITMENTS AND CONTINGENCIES
IPG PHOTONICS CORPORATION EQUITY:
Common stock, $0.0001 par value, 175,000,000 shares authorized; 53,147,812 shares issued and outstanding at June 30, 2016; 52,883,902 shares issued and outstanding at December 31, 2015	5	5
Additional paid-in capital	629,694	607,649
Retained earnings	949,741	833,356
Accumulated other comprehensive loss	(156,451)	(181,482)
Total IPG Photonics Corporation equity	1,422,989	1,259,528
NONCONTROLLING INTERESTS	174	1,137
Total equity	1,423,163	1,260,665
TOTAL	$ 1,629,307	$ 1,453,429

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2016	Dec. 31, 2015
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)	53,147,812	52,883,902
Common stock, shares outstanding (in shares)	53,147,812	52,883,902

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement [Abstract]
NET SALES	$ 252,787	$ 235,138	$ 460,035	$ 434,098
COST OF SALES	115,084	106,435	207,921	197,568
GROSS PROFIT	137,703	128,703	252,114	236,530
OPERATING EXPENSES:
Sales and marketing	9,689	7,962	17,723	15,511
Research and development	18,412	15,114	35,901	29,344
General and administrative	16,151	15,017	30,052	27,795
(Gain) loss on foreign exchange	(1,556)	3,167	3,411	(5,585)
Total operating expenses	42,696	41,260	87,087	67,065
OPERATING INCOME	95,007	87,443	165,027	169,465
OTHER INCOME (EXPENSE), Net:
Interest income (expense), net	270	(112)	462	(296)
Other income, net	141	161	148	246
Total other income (expense)	411	49	610	(50)
INCOME BEFORE PROVISION FOR INCOME TAXES	95,418	87,492	165,637	169,415
PROVISION FOR INCOME TAXES	(28,387)	(26,248)	(49,277)	(50,825)
NET INCOME	67,031	61,244	116,360	118,590
LESS: NET LOSS ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(27)	(55)	(25)	(68)
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION	$ 67,058	$ 61,299	$ 116,385	$ 118,658
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE:
Basic (in dollars per share)	$ 1.26	$ 1.16	$ 2.20	$ 2.26
Diluted (in dollars per share)	$ 1.25	$ 1.15	$ 2.17	$ 2.22
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (in shares)	53,065	52,657	52,981	52,572
Diluted (in shares)	53,788	53,442	53,705	53,355

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 67,031	$ 61,244	$ 116,360	$ 118,590
Other comprehensive income, net of tax:
Translation adjustments	(3,615)	11,225	24,880	(27,094)
Unrealized gain on derivatives	151	52	151	95
Total other comprehensive loss	(3,464)	11,277	25,031	(26,999)
Comprehensive income	63,567	72,521	141,391	91,591
Comprehensive loss attributable to noncontrolling interest	(19)	(55)	(13)	(68)
Comprehensive income attributable to IPG Photonics Corporation	$ 63,586	$ 72,576	$ 141,404	$ 91,659

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 116,360	$ 118,590
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,653	20,176
Deferred income taxes	(9,268)	(2,118)
Stock-based compensation	10,436	8,862
Unrealized losses (gains) on foreign currency transactions	2,240	(3,412)
Other	294	95
Provisions for inventory, warranty & bad debt	20,459	18,804
Changes in assets and liabilities that (used) provided cash:
Accounts receivable	2,885	(31,748)
Inventories	(34,668)	(33,211)
Prepaid expenses and other current assets	(652)	1,945
Accounts payable	(8,441)	4,422
Accrued expenses and other liabilities	(4,341)	(2,397)
Income and other taxes payable	(10,653)	7,067
Excess tax benefit from exercise of equity instruments	(3,030)	(5,665)
Net cash provided by operating activities	105,274	101,410
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of and deposits on property, plant and equipment	(70,863)	(32,606)
Proceeds from sales of property, plant and equipment	184	139
Purchases of short-term investments	(62,211)	0
Proceeds from short-term investments	41,720	0
Acquisition of businesses, net of cash acquired	(46,527)	(4,958)
Other	72	86
Net cash used in investing activities	(137,625)	(37,339)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line-of-credit facilities	4,002	9,432
Payments on line-of-credit facilities	(4,002)	(10,209)
Purchase of noncontrolling interests	(950)	0
Proceeds on long-term borrowings	23,750	0
Principal payments on long-term borrowings	(1,000)	(12,333)
Exercise of employee stock options and issuances under employee stock purchase plan	8,579	9,574
Excess tax benefit from exercise of equity instruments	3,030	5,665
Net cash provided by financing activities	33,409	2,129
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	3,696	(16,842)
NET INCREASE IN CASH AND CASH EQUIVALENTS	4,754	49,358
CASH AND CASH EQUIVALENTS — Beginning of period	582,532	522,150
CASH AND CASH EQUIVALENTS — End of period	587,286	571,508
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	349	533
Cash paid for income taxes	66,478	44,728
Non-cash transactions:
Demonstration units transferred from inventory to other assets	1,746	1,479
Inventory transferred to machinery and equipment	1,129	1,072
Additions to property, plant and equipment included in accounts payable	$ 806	$ 406

Consolidated Statements Of Equi

Consolidated Statements Of Equity - USD ($) $ in Thousands	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE LOSS	TOTAL IPG PHOTONICS CORPORATION EQUITY	NONCONTROLLING INTERESTS (NCI)
Balance, beginning of year at Dec. 31, 2014		$ 5	$ 567,617	$ 591,202	$ (112,263)		$ 0
Balance, beginning of year, shares at Dec. 31, 2014		52,369,688
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, shares		333,703
Common stock issued under employee stock purchase plan, shares		17,623
Stock-based compensation			8,862
Exercise of stock options and related tax benefit from exercise		$ 0	14,131
Common stock issued under employee stock purchase plan		0	1,108
Net income attributable to IPG Photonics Corporation	$ 118,658			118,658
Translation adjustments	(27,094)				(27,094)
Change in unrealized gain on derivatives, net of tax	95				95
Purchase of NCI							0
Attribution to NCI							1,579
Net loss attributable to NCI	68						(68)
Other comprehensive income (loss) attributable to NCI	68						(77)
Balance, end of period at Jun. 30, 2015	1,163,755	$ 5	591,718	709,860	(139,262)	$ 1,162,321	1,434
Balance, end of period, shares at Jun. 30, 2015		52,721,014
Balance, beginning of year at Dec. 31, 2015	1,260,665	$ 5	607,649	833,356	(181,482)		1,137
Balance, beginning of year, shares at Dec. 31, 2015		52,883,902
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options, shares		244,895
Common stock issued under employee stock purchase plan, shares		19,015
Stock-based compensation			10,436
Exercise of stock options and related tax benefit from exercise		$ 0	10,316
Common stock issued under employee stock purchase plan		0	1,293
Net income attributable to IPG Photonics Corporation	116,385			116,385
Translation adjustments	24,880				24,880
Change in unrealized gain on derivatives, net of tax	151				151
Purchase of NCI							(950)
Attribution to NCI							0
Net loss attributable to NCI	25						(25)
Other comprehensive income (loss) attributable to NCI	13						12
Balance, end of period at Jun. 30, 2016	$ 1,423,163	$ 5	$ 629,694	$ 949,741	$ (156,451)	$ 1,422,989	$ 174
Balance, end of period, shares at Jun. 30, 2016		53,147,812

Basis Of Presentation

Basis Of Presentation	6 Months Ended
	Jun. 30, 2016
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, 2015 . 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	6 Months Ended
	Jun. 30, 2016
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"). The standard is intended to simplify several areas of accounting for share-based compensation arrangements, including income tax impact, classification on the statement of cash flows and forfeitures. ASU 2016-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is permitted. The impact that the standard will have on the Company's consolidated financial statements will depend upon certain criteria including the timing of the exercise and release of equity instruments, the value realized upon exercise or release of equity instruments and the fair value of the equity instruments when they were granted. The excess tax benefit from the exercise of equity instruments was $3,030 and $5,665 for the six months ended June 30, 2016 and 2015 , respectively. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" ("ASU 2016-02"). The standard requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 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 currently evaluating the impact that the standard will have and does not expect it to have a material impact 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"). The standard 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 impact on its consolidated financial statements upon adoption. In November 2015, the FASB issued amended guidance that clarifies that in a classified statement of financial position, an entity shall classify deferred tax liabilities and assets as non-current amounts. The new guidance supersedes ASC 740-10-45-5 which required the deferred tax assets and liabilities for a particular tax jurisdiction be allocated between current and non-current deferred tax assets for that tax jurisdiction on a pro rata basis. The new standard will become effective for the Company's fiscal year beginning January 1, 2017. The Company has determined that the standard will not have a material impact on its consolidated financial statements upon adoption. Current deferred tax assets at June 30, 2016 and December 31, 2015 were $24,477 and $20,346 , respectively. Current deferred tax liabilities at June 30, 2016 and December 31, 2015 were $4,152 and $3,190 , respectively. In May 2014, the FASB issued Accounting Standards Update No. 2014-09 ("ASU 2014-09") "Revenue from Contracts with Customers." 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. As currently issued and amended, ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, though early adoption is permitted for annual reporting periods beginning after December 15, 2016. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-09 on its consolidated financial statements and does not expect it to have a material impact on its consolidated financial statements upon adoption.

Inventories

Inventories	6 Months Ended
	Jun. 30, 2016
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: June 30, December 31, 2016 2015 Components and raw materials $ 89,686 $ 70,394 Work-in-process 35,353 43,259 Finished components and devices 116,243 90,085 Total $ 241,282 $ 203,738 The Company recorded inventory provisions totaling $5,772 and $3,685 for the three months ended June 30, 2016 and 2015 , respectively, and $9,725 and $7,011 for the six months ended June 30, 2016 and 2015 , 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	6 Months Ended
	Jun. 30, 2016
Payables and Accruals [Abstract]
Accrued Expenses And Other Liabilities	ACCRUED EXPENSES AND OTHER LIABILITIES Accrued expenses and other liabilities consist of the following: June 30, December 31, 2016 2015 Accrued compensation $ 30,657 $ 33,617 Customer deposits and deferred revenue 25,927 21,525 Current portion of accrued warranty 13,971 14,871 Other 9,979 5,654 Total $ 80,534 $ 75,667

Financing Arrangements

Financing Arrangements	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Financing Arrangements	FINANCING ARRANGEMENTS The Company's borrowings under existing financing arrangements consist of the following: June 30, December 31, 2016 2015 Revolving line-of-credit facilities: European overdraft facilities $ — $ — Euro line-of-credit — — U.S. line-of-credit — — Total $ — $ — Term debt: Long-term notes $ 42,417 $ 19,667 Less: current portion (3,188 ) (2,000 ) Total long-term debt $ 39,229 $ 17,667 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. At June 30, 2016 and December 31, 2015 , there were no amounts drawn on the U.S. line-of-credit, and there were $84 and $2,828 , respectively, of guarantees issued against the facility which reduces the amount of the facility to draw. At June 30, 2016 and December 31, 2015 , there were no amounts drawn on the Euro line-of-credit, and there were $7,927 and $8,221 , respectively, of guarantees issued against the facility which reduces the amount of the facility available to draw. At June 30, 2016 , the amount due on the two long-term notes was $42,417 of which $3,188 is the current portion. During the second quarter of 2016, the Company financed the purchase of a building in Marlborough, Massachusetts with an unsecured note of $23,750 . The interest on this unsecured long-term 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 long-term note matures in May 2023, at which time the outstanding debt balance will be $15,438 . The amount due on this unsecured long-term note as of June 30, 2016 was $23,750 of which $1,188 is the current portion. The Company has another note that is secured by the Company's corporate aircraft. The interest rate on this collateralized long-term 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 . The amount due on this collateralized long-term note at June 30, 2016 was $18,667 of which $2,000 is the current portion.

Net Income Attributable To IPG

Net Income Attributable To IPG Photonics Corporation Per Share	6 Months Ended
	Jun. 30, 2016
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Net income attributable to IPG Photonics Corporation $ 67,058 $ 61,299 $ 116,385 $ 118,658 Weighted average shares 53,065 52,657 52,981 52,572 Dilutive effect of common stock equivalents 723 785 724 783 Diluted weighted average common shares 53,788 53,442 53,705 53,355 Basic net income attributable to IPG Photonics Corporation per share $ 1.26 $ 1.16 $ 2.20 $ 2.26 Diluted net income attributable to IPG Photonics Corporation per share $ 1.25 $ 1.15 $ 2.17 $ 2.22 For the three months ended June 30, 2016 and 2015 , respectively, the computation of diluted weighted average common shares excludes common stock equivalents of 59,000 shares and 9,500 shares which includes restricted stock units ("RSUs") of 11,000 and 1,300 and performance stock units ("PSUs") of 0 and 4,400 . It also excludes 95,100 and 52,300 shares, of which, includes RSUs of 31,300 and 41,700 and PSUs of 6,400 and 4,400 for the six months ended June 30, 2016 and 2015 , respectively, because the effect would be anti-dilutive.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2016
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 rape swap associated with a new long-term note issued during the second quarter of 2016 that will terminate with long-term note in May 2023. The Company previously had a cash flow hedge which was an interest rate swap associated with a U.S. long-term note which matured in June 2015. The fair value amounts in the consolidated balance sheet related to the interest rate swaps were: Notional Amounts 1 Other Assets Other Long-Term Liabilities June 30, December 31, June 30, December 31, June 30, December 31, 2016 2015 2016 2015 2016 2015 $ 23,750 $ — $ 239 $ — $ — $ — (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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Effective portion recognized in other comprehensive loss, pretax: Interest rate swap $ 239 $ 171 $ 239 $ 304 Effective portion reclassified from other comprehensive loss to interest expense, pretax: Interest rate swap $ — $ (86 ) $ — $ (153 ) Ineffective portion recognized in income: Interest rate swap $ — $ — $ — $ —

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 320,110 $ 320,110 $ — $ — Short-term investments 126,759 126,759 — — Interest rate swap 239 — 239 — Auction rate securities 1,140 — — 1,140 Total assets $ 448,248 $ 446,869 $ 239 $ 1,140 Liabilities Collateralized long-term notes $ 42,417 $ 42,417 $ — $ — Contingent purchase consideration 20 — — 20 Total liabilities $ 42,437 $ 42,417 $ — $ 20 Fair Value Measurements at December 31, 2015 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 214,232 $ 214,232 $ — $ — Short-term investments 106,375 106,375 — — Auction rate securities 1,136 — — 1,136 Total assets $ 321,743 $ 320,607 $ — $ 1,136 Liabilities Collateralized long-term notes $ 19,667 $ 19,667 $ — $ — Contingent purchase consideration 20 — — 20 Total liabilities $ 19,687 $ 19,667 $ — $ 20 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 these investments as of June 30, 2016 and December 31, 2015 was $126,759 and $106,375 , respectively, which represents an unrealized loss of $35 and $209 , 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. Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Auction Rate Securities Balance, beginning of period $ 1,138 $ 1,130 $ 1,136 $ 1,128 Change in fair value and accretion 2 2 4 4 Balance, end of period $ 1,140 $ 1,132 $ 1,140 $ 1,132 Contingent Purchase Consideration Balance, beginning of period $ 21 $ 83 $ 20 $ 98 Change in fair value and currency fluctuations (1 ) (3 ) — (18 ) Balance, end of period $ 20 $ 80 $ 20 $ 80

Goodwill And Intangibles

Goodwill And Intangibles	6 Months Ended
	Jun. 30, 2016
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 six months ended June 30, 2016 : Amounts Balance at January 1 $ 505 Foreign exchange adjustment (3 ) Total goodwill arising from acquisition 19,959 Balance at June 30 $ 20,461 Intangible assets, subject to amortization, consisted of the following: June 30, 2016 December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Patents $ 6,641 $ (4,750 ) $ 1,891 6 Years $ 6,641 $ (4,573 ) $ 2,068 6 Years Customer relationships 10,041 (3,278 ) 6,763 5 Years 3,325 (3,092 ) 233 5 Years Production know-how 6,699 (3,751 ) 2,948 8 Years 6,672 (3,339 ) 3,333 8 Years Technology, trademark and tradename 20,468 (2,674 ) 17,794 8 Years 8,247 (1,977 ) 6,270 8 Years $ 43,849 $ (14,453 ) $ 29,396 $ 24,885 $ (12,981 ) $ 11,904 During the second quarter of 2016, the Company acquired the working capital and long-term assets of Menara Networks, Inc. ("Menara"). Menara is located in Dallas, Texas. The Company paid $46,711 which represents the fair value of Menara on that date. As a result of the acquisition, the Company recorded intangible assets of $19,253 related to technology, tradename and customer relationships. Additionally, the Company recorded $19,959 of goodwill related to expected synergies for the Company's expansion of product offerings within the telecom market. The goodwill arising from this acquisition will not be deductible for tax purposes. The purchase price allocations included in the Company's financial statements are not complete. They represent the preliminary fair value estimates as of June 30, 2016 and are subject to subsequent adjustment as the Company obtains additional information during the measurement period and finalizes its fair value estimates. Any subsequent adjustments to these fair value estimates occurring during the measurement period will result in an adjustment to goodwill or income, as applicable. Amortization expense for the three months ended June 30, 2016 and 2015 was $901 and $608 , respectively. Amortization expense for the six months ended June 30, 2016 and 2015 was $1,444 and $1,120 , respectively. The estimated future amortization expense for intangibles for the remainder of 2016 and subsequent years is as follows: 2016 2017 2018 2019 2020 Thereafter Total $2,622 $4,989 $4,924 $4,819 $4,185 $7,857 $29,396

Product Warranties

Product Warranties	6 Months Ended
	Jun. 30, 2016
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 six months ended June 30, 2016 and 2015 . 2016 2015 Balance at January 1 $ 28,210 $ 19,272 Provision for warranty accrual 10,344 10,944 Warranty claims (8,040 ) (5,787 ) Foreign currency translation 442 (1,107 ) Balance at June 30 $ 30,956 $ 23,322 Accrued warranty reported in the accompanying consolidated financial statements as of June 30, 2016 and December 31, 2015 consisted of $13,971 and $14,871 in accrued expenses and other liabilities and $16,985 and $13,339 in other long-term liabilities, respectively.

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The Company had total unrecognized tax benefits for the periods ended June 30, 2016 and 2015 of $7,579 and $6,494 , respectively. There were no changes in these balances as compared to the years ended December 31, 2015 and 2014. 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	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 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.

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2016
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS During the three months ended June 30, 2016 , the Company purchased an office building located in Marlborough, Massachusetts from a subsidiary of IP Fibre Devices (UK) Ltd. ("IPFD") for $23,750 . The purchase price was based on the fair market value of the building determined using an independent appraisal. The appraisal was commissioned by the Governance Committee of the Board of Directors. The Company's Chief Executive Officer ("CEO") is the managing director of IPFD. The CEO and certain founding members of the Company, which include the Senior Vice President, Chief Technology Officer and the Senior Vice President, Europe and Managing Director of IPG Laser GmbH, own shares in IPFD which is a stockholder of the Company. The Company leased space in the building from the subsidiary of IPFD prior to purchasing it.

Recent Accounting Pronounceme21

Recent Accounting Pronouncements (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
New 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"). The standard is intended to simplify several areas of accounting for share-based compensation arrangements, including income tax impact, classification on the statement of cash flows and forfeitures. ASU 2016-09 is effective for fiscal years, and interim periods within those years, beginning after December 15, 2016, and early adoption is permitted. The impact that the standard will have on the Company's consolidated financial statements will depend upon certain criteria including the timing of the exercise and release of equity instruments, the value realized upon exercise or release of equity instruments and the fair value of the equity instruments when they were granted. The excess tax benefit from the exercise of equity instruments was $3,030 and $5,665 for the six months ended June 30, 2016 and 2015 , respectively. In February 2016, the FASB issued ASU No. 2016-02, "Leases (Topic 842)" ("ASU 2016-02"). The standard requires a lessee to recognize assets and liabilities on the balance sheet for leases with lease terms greater than 12 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 currently evaluating the impact that the standard will have and does not expect it to have a material impact 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"). The standard 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 impact on its consolidated financial statements upon adoption. In November 2015, the FASB issued amended guidance that clarifies that in a classified statement of financial position, an entity shall classify deferred tax liabilities and assets as non-current amounts. The new guidance supersedes ASC 740-10-45-5 which required the deferred tax assets and liabilities for a particular tax jurisdiction be allocated between current and non-current deferred tax assets for that tax jurisdiction on a pro rata basis. The new standard will become effective for the Company's fiscal year beginning January 1, 2017. The Company has determined that the standard will not have a material impact on its consolidated financial statements upon adoption. Current deferred tax assets at June 30, 2016 and December 31, 2015 were $24,477 and $20,346 , respectively. Current deferred tax liabilities at June 30, 2016 and December 31, 2015 were $4,152 and $3,190 , respectively. In May 2014, the FASB issued Accounting Standards Update No. 2014-09 ("ASU 2014-09") "Revenue from Contracts with Customers." 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. As currently issued and amended, ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017, including interim periods within that reporting period, though early adoption is permitted for annual reporting periods beginning after December 15, 2016. The Company is currently in the process of evaluating the impact of the adoption of ASU 2014-09 on its consolidated financial statements and does not expect it to have a material impact on its consolidated financial statements upon adoption.

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2016
Inventory Disclosure [Abstract]
Components Of Inventories	Inventories consist of the following: June 30, December 31, 2016 2015 Components and raw materials $ 89,686 $ 70,394 Work-in-process 35,353 43,259 Finished components and devices 116,243 90,085 Total $ 241,282 $ 203,738

Accrued Expenses And Other Li23

Accrued Expenses And Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2016
Payables and Accruals [Abstract]
Components Of Accrued Expenses And Other Liabilities	Accrued expenses and other liabilities consist of the following: June 30, December 31, 2016 2015 Accrued compensation $ 30,657 $ 33,617 Customer deposits and deferred revenue 25,927 21,525 Current portion of accrued warranty 13,971 14,871 Other 9,979 5,654 Total $ 80,534 $ 75,667

Financing Arrangements (Tables)

Financing Arrangements (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Borrowings Under Existing Financing Arrangements	The Company's borrowings under existing financing arrangements consist of the following: June 30, December 31, 2016 2015 Revolving line-of-credit facilities: European overdraft facilities $ — $ — Euro line-of-credit — — U.S. line-of-credit — — Total $ — $ — Term debt: Long-term notes $ 42,417 $ 19,667 Less: current portion (3,188 ) (2,000 ) Total long-term debt $ 39,229 $ 17,667

Net Income Attributable To IP25

Net Income Attributable To IPG Photonics Corporation Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Net income attributable to IPG Photonics Corporation $ 67,058 $ 61,299 $ 116,385 $ 118,658 Weighted average shares 53,065 52,657 52,981 52,572 Dilutive effect of common stock equivalents 723 785 724 783 Diluted weighted average common shares 53,788 53,442 53,705 53,355 Basic net income attributable to IPG Photonics Corporation per share $ 1.26 $ 1.16 $ 2.20 $ 2.26 Diluted net income attributable to IPG Photonics Corporation per share $ 1.25 $ 1.15 $ 2.17 $ 2.22

Derivative Financial Instrume26

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
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 swaps were: Notional Amounts 1 Other Assets Other Long-Term Liabilities June 30, December 31, June 30, December 31, June 30, December 31, 2016 2015 2016 2015 2016 2015 $ 23,750 $ — $ 239 $ — $ — $ — (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 June 30, Six Months Ended June 30, 2016 2015 2016 2015 Effective portion recognized in other comprehensive loss, pretax: Interest rate swap $ 239 $ 171 $ 239 $ 304 Effective portion reclassified from other comprehensive loss to interest expense, pretax: Interest rate swap $ — $ (86 ) $ — $ (153 ) Ineffective portion recognized in income: Interest rate swap $ — $ — $ — $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2016
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 June 30, 2016 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 320,110 $ 320,110 $ — $ — Short-term investments 126,759 126,759 — — Interest rate swap 239 — 239 — Auction rate securities 1,140 — — 1,140 Total assets $ 448,248 $ 446,869 $ 239 $ 1,140 Liabilities Collateralized long-term notes $ 42,417 $ 42,417 $ — $ — Contingent purchase consideration 20 — — 20 Total liabilities $ 42,437 $ 42,417 $ — $ 20 Fair Value Measurements at December 31, 2015 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 214,232 $ 214,232 $ — $ — Short-term investments 106,375 106,375 — — Auction rate securities 1,136 — — 1,136 Total assets $ 321,743 $ 320,607 $ — $ 1,136 Liabilities Collateralized long-term notes $ 19,667 $ 19,667 $ — $ — Contingent purchase consideration 20 — — 20 Total liabilities $ 19,687 $ 19,667 $ — $ 20
Fair Value Of Auction Rate Securities	Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Auction Rate Securities Balance, beginning of period $ 1,138 $ 1,130 $ 1,136 $ 1,128 Change in fair value and accretion 2 2 4 4 Balance, end of period $ 1,140 $ 1,132 $ 1,140 $ 1,132 Contingent Purchase Consideration Balance, beginning of period $ 21 $ 83 $ 20 $ 98 Change in fair value and currency fluctuations (1 ) (3 ) — (18 ) Balance, end of period $ 20 $ 80 $ 20 $ 80

Goodwill And Intangibles (Table

Goodwill And Intangibles (Tables)	6 Months Ended
	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Goodwill	The following table sets forth the changes in the carrying amount of goodwill for the six months ended June 30, 2016 : Amounts Balance at January 1 $ 505 Foreign exchange adjustment (3 ) Total goodwill arising from acquisition 19,959 Balance at June 30 $ 20,461
Intangible Assets	Intangible assets, subject to amortization, consisted of the following: June 30, 2016 December 31, 2015 Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Gross Carrying Amount Accumulated Amortization Net Carrying Amount Weighted- Average Lives Patents $ 6,641 $ (4,750 ) $ 1,891 6 Years $ 6,641 $ (4,573 ) $ 2,068 6 Years Customer relationships 10,041 (3,278 ) 6,763 5 Years 3,325 (3,092 ) 233 5 Years Production know-how 6,699 (3,751 ) 2,948 8 Years 6,672 (3,339 ) 3,333 8 Years Technology, trademark and tradename 20,468 (2,674 ) 17,794 8 Years 8,247 (1,977 ) 6,270 8 Years $ 43,849 $ (14,453 ) $ 29,396 $ 24,885 $ (12,981 ) $ 11,904
Estimated Future Amortization Expense For Intangibles	The estimated future amortization expense for intangibles for the remainder of 2016 and subsequent years is as follows: 2016 2017 2018 2019 2020 Thereafter Total $2,622 $4,989 $4,924 $4,819 $4,185 $7,857 $29,396

Product Warranties (Tables)

Product Warranties (Tables)	6 Months Ended
	Jun. 30, 2016
Product Warranties Disclosures [Abstract]
Summary Of Product Warranty Activity	The following table summarizes product warranty activity recorded during the six months ended June 30, 2016 and 2015 . 2016 2015 Balance at January 1 $ 28,210 $ 19,272 Provision for warranty accrual 10,344 10,944 Warranty claims (8,040 ) (5,787 ) Foreign currency translation 442 (1,107 ) Balance at June 30 $ 30,956 $ 23,322

Recent Accounting Pronounceme30

Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accounting Policies [Abstract]
Excess tax benefit from the exercise of equity instruments	$ 3,030	$ 5,665
Excess Tax Benefit from Share-based Compensation, Financing Activities	3,030	$ 5,665
Deferred tax assets, current	24,477		$ 20,346
Deferred tax liabilities, current	$ 4,152		$ 3,190

Inventories (Components Of Inve

Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Inventory Disclosure [Abstract]
Components and raw materials	$ 89,686	$ 70,394
Work-in-process	35,353	43,259
Finished components and devices	116,243	90,085
Total	$ 241,282	$ 203,738

Inventories (Narrative) (Detail

Inventories (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Inventory Disclosure [Abstract]
Inventory provisions	$ 5,772	$ 3,685	$ 9,725	$ 7,011

Accrued Expenses And Other Li33

Accrued Expenses And Other Liabilities (Components Of Accrued Expenses And Other Liabilities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued compensation	$ 30,657	$ 33,617
Customer deposits and deferred revenue	25,927	21,525
Current portion of accrued warranty	13,971	14,871
Other	9,979	5,654
Total	$ 80,534	$ 75,667

Financing Arrangements (Borrowi

Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details)	3 Months Ended	6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2016USD ($)note	May 31, 2023USD ($)	Oct. 31, 2019USD ($)	Dec. 31, 2015USD ($)
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	$ 0	$ 0			$ 0
Term debt:
Less: current portion	(3,188,000)	(3,188,000)			(2,000,000)
Total long-term debt	39,229,000	$ 39,229,000			17,667,000
Number of long term notes | note		2
Unsecured note	23,750,000	$ 23,750,000
Unsecured Debt
Term debt:
Amount due on long-term note	23,750,000	23,750,000
Current portion of long-term note	$ 1,188,000	$ 1,188,000
Unsecured Debt | Scenario, Forecast
Term debt:
Amount due on long-term note			$ 15,438,000
Unsecured Debt | Interest rate swap
Term debt:
Derivative, fixed interest rate	2.85%	2.85%
Unsecured Debt | London Interbank Offered Rate (LIBOR)
Term debt:
Derivative, basis spread on variable rate	1.20%
Secured Debt
Term debt:
Amount due on long-term note	$ 18,667,000	$ 18,667,000
Current portion of long-term note	$ 2,000,000	$ 2,000,000
Interest rate percentage	2.81%	2.81%
Secured Debt | Scenario, Forecast
Term debt:
Amount due on long-term note				$ 12,000,000
European overdraft facilities
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	$ 0	$ 0			0
Euro line-of-credit
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	0	0			0
Term debt:
Guarantees issued	7,927,000	7,927,000			8,221,000
Amount drawn on line of credit	0	0			0
U.S. line-of-credit
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	0	0			0
Term debt:
Guarantees issued	84,000	84,000			2,828,000
Amount drawn on line of credit	0	0			0
Long-term notes
Term debt:
Long-term notes	42,417,000	42,417,000			$ 19,667,000
Amount due on long-term note	42,417,000	42,417,000
Current portion of long-term note	$ 3,188,000	$ 3,188,000

Net Income Attributable To IP35

Net Income Attributable To IPG Photonics Corporation Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income attributable to IPG Photonics Corporation	$ 67,058	$ 61,299	$ 116,385	$ 118,658
Weighted average shares	53,065	52,657	52,981	52,572
Dilutive effect of common stock equivalents	723	785	724	783
Diluted weighted average common shares	53,788	53,442	53,705	53,355
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.26	$ 1.16	$ 2.20	$ 2.26
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 1.25	$ 1.15	$ 2.17	$ 2.22
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares	59,000	9,500	95,100	52,300
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares	11,000	1,300	31,300	41,700
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares	0	4,400	6,400	4,400

Derivative Financial Instrume36

Derivative Financial Instruments (Fair Value Of Cash Flow Hedges) (Details) - USD ($)	Jun. 30, 2016	Dec. 31, 2015
Interest rate swap
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	$ 23,750,000	$ 0
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	0
Other Assets | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative asset, fair value	239,000	0
Other Long-Term Liabilities | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative liability, fair value	$ 0	$ 0

Derivative Financial Instrume37

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		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion recognized in other comprehensive loss, pretax:	$ 239	$ 171	$ 239	$ 304
Effective portion reclassified from other comprehensive loss to interest expense, pretax:	0	(86)	0	(153)
Ineffective portion recognized in income:	$ 0	$ 0	$ 0	$ 0

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 448,248	$ 321,743
Liabilities	42,437	19,687
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	446,869	320,607
Liabilities	42,417	19,667
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	239	0
Liabilities	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,140	1,136
Liabilities	20	20
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	320,110	214,232
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	320,110	214,232
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	126,759	106,375
Short-term investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	126,759	106,375
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	239
Interest rate swap | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0
Interest rate swap | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	239
Interest rate swap | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0
Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,140	1,136
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	1,140	1,136
Collateralized long-term notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	42,417	19,667
Collateralized long-term notes | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	42,417	19,667
Collateralized long-term notes | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Collateralized long-term notes | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Contingent purchase consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	20	20
Contingent purchase consideration | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Contingent purchase consideration | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Contingent purchase consideration | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	20	20
Held-to-maturity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities, unrealized loss	$ 35	$ 209

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Of Auction Rate Securities) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 1,138	$ 1,130	$ 1,136	$ 1,128
Change in fair value and accretion	2	2	4	4
Balance, end of period	1,140	1,132	1,140	1,132
Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	21	83	20	98
Change in fair value and currency fluctuations	(1)	(3)	0	(18)
Balance, end of period	$ 20	$ 80	$ 20	$ 80

Goodwill And Intangibles (Sched

Goodwill And Intangibles (Schedule of Changes) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)
Goodwill [Roll Forward]
Balance at January 1	$ 505
Foreign exchange adjustment	(3)
Total goodwill arising from acquisition	19,959
Balance at June 30	$ 20,461

Goodwill And Intangibles (Intan

Goodwill And Intangibles (Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 43,849	$ 24,885
Accumulated Amortization	(14,453)	(12,981)
Net Carrying Amount	29,396	11,904
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,641	6,641
Accumulated Amortization	(4,750)	(4,573)
Net Carrying Amount	$ 1,891	$ 2,068
Weighted- Average Lives	6 years	6 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 10,041	$ 3,325
Accumulated Amortization	(3,278)	(3,092)
Net Carrying Amount	$ 6,763	$ 233
Weighted- Average Lives	5 years	5 years
Production know-how
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,699	$ 6,672
Accumulated Amortization	(3,751)	(3,339)
Net Carrying Amount	$ 2,948	$ 3,333
Weighted- Average Lives	8 years	8 years
Technology, trademark and tradename
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 20,468	$ 8,247
Accumulated Amortization	(2,674)	(1,977)
Net Carrying Amount	$ 17,794	$ 6,270
Weighted- Average Lives	8 years	8 years

Goodwill And Intangibles (Narra

Goodwill And Intangibles (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Goodwill, acquired during period			$ 19,959
Amortization expense	$ 901	$ 608	1,444	$ 1,120
Menara Networks
Business Acquisition [Line Items]
Business combination, consideration transferred	46,711
Business combination, intangibles assets	$ 19,253		$ 19,253

Goodwill And Intangibles (Estim

Goodwill And Intangibles (Estimated Future Amortization Expense For Intangibles) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 2,622
2,017	4,989
2,018	4,924
2,019	4,819
2,020	4,185
Thereafter	7,857
Net Carrying Amount	$ 29,396	$ 11,904

Product Warranties (Narrative)

Product Warranties (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Product Warranty Liability [Line Items]
Accrued warranty reported in accrued expenses and other liabilities	$ 13,971	$ 14,871
Accrued warranty reported in other long-term liabilities	$ 16,985	$ 13,339
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	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 28,210	$ 19,272
Provision for warranty accrual	10,344	10,944
Warranty claims	(8,040)	(5,787)
Foreign currency translation	442	(1,107)
Balance at June 30	$ 30,956	$ 23,322

Income Taxes (Details)

Income Taxes (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Unrecognized tax benefits			$ 7,579,000	$ 6,494,000
Unrecognized tax benefits, period increase (decrease)	$ 0	$ 0

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015
Related Party Transaction [Line Items]
Proceeds on long-term borrowings		$ 23,750	$ 0
Management
Related Party Transaction [Line Items]
Proceeds on long-term borrowings	$ 23,750