IPG Photonics (IPGP) 10-Q 9 May 16 2016 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 08, 2016
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2016
Document Fiscal Period Focus	Q1
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		53,077,947

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
CURRENT ASSETS:
Cash and cash equivalents	$ 613,692	$ 582,532
Short-term investments	126,273	106,584
Accounts receivable, net	146,505	150,479
Inventories	226,907	203,738
Prepaid income taxes	37,159	33,692
Prepaid expenses and other current assets	24,577	25,564
Deferred income taxes, net	22,526	20,346
Total current assets	1,197,639	1,122,935
DEFERRED INCOME TAXES, NET	11,889	9,386
GOODWILL	502	505
INTANGIBLE ASSETS, NET	11,066	11,904
PROPERTY, PLANT AND EQUIPMENT, NET	309,206	288,604
OTHER ASSETS	19,798	20,095
TOTAL	1,550,100	1,453,429
CURRENT LIABILITIES:
Revolving line-of-credit facilities	0	0
Current portion of long-term debt	2,000	2,000
Accounts payable	20,277	26,314
Accrued expenses and other liabilities	70,987	75,667
Deferred income taxes, net	3,751	3,190
Income taxes payable	53,656	37,809
Total current liabilities	150,671	144,980
DEFERRED INCOME TAXES AND OTHER LONG-TERM LIABILITIES	35,264	30,117
LONG-TERM DEBT, NET OF CURRENT PORTION	17,167	17,667
Total liabilities	$ 203,102	$ 192,764
COMMITMENTS AND CONTINGENCIES (NOTE 12)
IPG PHOTONICS CORPORATION EQUITY:
Common stock, $0.0001 par value, 175,000,000 shares authorized; 52,966,460 shares issued and outstanding at March 31, 2016; 52,883,902 shares issued and outstanding at December 31, 2015	$ 5	$ 5
Additional paid-in capital	616,156	607,649
Retained earnings	882,682	833,356
Accumulated other comprehensive loss	(152,987)	(181,482)
Total IPG Photonics Corporation equity	1,345,856	1,259,528
NONCONTROLLING INTERESTS	1,142	1,137
Total equity	1,346,998	1,260,665
TOTAL	$ 1,550,100	$ 1,453,429

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 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	175,000,000	175,000,000
Common stock, shares issued	52,966,460	52,883,902
Common stock, shares outstanding	52,966,460	52,883,902

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Statement [Abstract]
NET SALES	$ 207,248	$ 198,960
COST OF SALES	92,838	91,133
GROSS PROFIT	114,410	107,827
OPERATING EXPENSES:
Sales and marketing	8,034	7,549
Research and development	17,489	14,230
General and administrative	13,901	12,778
Loss (gain) on foreign exchange	4,967	(8,752)
Total operating expenses	44,391	25,805
OPERATING INCOME	70,019	82,022
OTHER INCOME (EXPENSE), Net:
Interest income (expense), net	192	(184)
Other income, net	7	85
Total other income (expense)	199	(99)
INCOME BEFORE PROVISION FOR INCOME TAXES	70,218	81,923
PROVISION FOR INCOME TAXES	(20,890)	(24,577)
NET INCOME	49,328	57,346
LESS: NET INCOME (LOSS) ATTRIBUTABLE TO NONCONTROLLING INTERESTS	2	(13)
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION	$ 49,326	$ 57,359
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE:
Basic (in dollars per share)	$ 0.93	$ 1.09
Diluted (in dollars per share)	$ 0.92	$ 1.08
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (shares)	52,898	52,486
Diluted (shares)	53,621	53,267

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 49,328	$ 57,346
Other comprehensive income, net of tax:
Translation adjustments	28,495	(38,319)
Unrealized gain on derivatives	0	43
Total other comprehensive loss	28,495	(38,276)
Comprehensive income	77,823	19,070
Comprehensive income (loss) attributable to noncontrolling interest	5	(13)
Comprehensive income attributable to IPG Photonics Corporation	$ 77,818	$ 19,083

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 49,328	$ 57,346
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,394	9,743
Deferred income taxes	(2,741)	5,708
Stock-based compensation	4,959	4,127
Unrealized losses (gains) on foreign currency transactions	4,802	(5,415)
Other	175	50
Provisions for inventory, warranty & bad debt	8,927	8,017
Changes in assets and liabilities that (used) provided cash:
Accounts receivable	8,140	(11,885)
Inventories	(19,365)	(13,898)
Prepaid expenses and other current assets	(178)	(723)
Accounts payable	(6,749)	(1,231)
Accrued expenses and other liabilities	(8,378)	(2,774)
Income and other taxes payable	14,583	7,716
Tax benefit from exercise of employee stock options	(904)	(4,773)
Net cash provided by operating activities	63,993	52,008
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of and deposits on property, plant and equipment	(24,960)	(14,027)
Proceeds from sales of property, plant and equipment	129	131
Purchases of short-term investments	(29,899)	0
Proceeds from short-term investments	10,000	0
Acquisition of businesses, net of cash acquired	0	(4,958)
Other	46	60
Net cash used in investing activities	(44,684)	(18,794)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line-of-credit facilities	2,214	3,616
Payments on line-of-credit facilities	(2,223)	(5,488)
Principal payments on long-term borrowings	(500)	(833)
Exercise of employee stock options and issuances under employee stock purchase plan	2,644	4,409
Tax benefit from exercise of employee stock options	904	4,773
Net cash provided by financing activities	3,039	6,477
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	8,812	(20,367)
NET INCREASE IN CASH AND CASH EQUIVALENTS	31,160	19,324
CASH AND CASH EQUIVALENTS — Beginning of period	582,532	522,150
CASH AND CASH EQUIVALENTS — End of period	613,692	541,474
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	171	293
Cash paid for income taxes	11,955	11,889
Non-cash transactions:
Demonstration units transferred from inventory to other assets	623	634
Inventory transferred to machinery and equipment	361	284
Additions to property, plant and equipment included in accounts payable	$ 326	$ 549

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
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		250,740
Stock-based compensation			4,127
Exercise of stock options and related tax benefit from exercise		$ 0	9,182
Net income attributable to IPG Photonics Corporation	$ 57,359			57,359
Translation adjustments	(38,319)				(38,319)
Change in unrealized gain on derivatives, net of tax	43				43
NCI of acquired company							1,579
Net income (loss) attributable to NCI	13						(13)
Other comprehensive income (loss) attributable to NCI	13						0
Balance, end of period at Mar. 31, 2015	1,080,519	$ 5	580,926	648,561	(150,539)	$ 1,078,953	1,566
Balance, end of period, shares at Mar. 31, 2015		52,620,428
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		82,558
Stock-based compensation			4,959
Exercise of stock options and related tax benefit from exercise		$ 0	3,548
Net income attributable to IPG Photonics Corporation	49,326			49,326
Translation adjustments	28,495				28,495
Change in unrealized gain on derivatives, net of tax	0				0
NCI of acquired company							0
Net income (loss) attributable to NCI	(2)						2
Other comprehensive income (loss) attributable to NCI	(5)						3
Balance, end of period at Mar. 31, 2016	$ 1,346,998	$ 5	$ 616,156	$ 882,682	$ (152,987)	$ 1,345,856	$ 1,142
Balance, end of period, shares at Mar. 31, 2016		52,966,460

Basis Of Presentation

Basis Of Presentation	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 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 Company is currently evaluating the impact that the standard will have on its consolidated financial statements. 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 on its consolidated financial statements. 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 on its consolidated financial statements. 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 valuation allowance 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 is currently assessing the impact of this amended guidance and the timing of adoption. 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 financial statements upon adoption.

Inventories

Inventories	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Inventories	INVENTORIES Inventories consist of the following: March 31, December 31, 2016 2015 Components and raw materials $ 81,922 $ 70,394 Work-in-process 39,648 43,259 Finished components and devices 105,337 90,085 Total $ 226,907 $ 203,738 The Company recorded inventory provisions totaling $3,953 and $3,326 for the three months ended March 31, 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	3 Months Ended
	Mar. 31, 2016
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, 2016 2015 Accrued compensation $ 26,437 $ 33,617 Customer deposits and deferred revenue 23,427 21,525 Current portion of accrued warranty 13,501 14,871 Other 7,622 5,654 Total $ 70,987 $ 75,667

Financing Arrangements

Financing Arrangements	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Financing Arrangements	FINANCING ARRANGEMENTS The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2016 2015 Revolving line-of-credit facilities: European overdraft facilities $ — $ — Euro line-of-credit — — U.S. line-of-credit — — Total $ — $ — Term debt: Collateralized long-term note $ 19,167 $ 19,667 Less: current portion (2,000 ) (2,000 ) Total long-term debt $ 17,167 $ 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 March 31, 2016 and December 31, 2015 , there were no amounts drawn on the U.S. line-of-credit, and there were $110 and $2,828 , respectively, of guarantees issued against the facility which reduces the amount of the facility to draw. At March 31, 2016 and December 31, 2015 , there were no amounts drawn on the Euro line-of-credit, and there were $7,173 and $8,221 , respectively, of guarantees issued against the facility which reduces the amount of the facility available to draw. At March 31, 2016 , the amount due on the collateralized long-term note was $19,167 of which $2,000 is the current portion. The note is secured by the Company's corporate aircraft. The interest rate on this note is fixed at 2.81% per annum and the note matures in October 2019, at which time the outstanding debt balance would be $12,000 .

Net Income Attributable To IPG

Net Income Attributable To IPG Photonics Corporation Per Share	3 Months Ended
	Mar. 31, 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 March 31, 2016 2015 Net income attributable to IPG Photonics Corporation $ 49,326 $ 57,359 Weighted average shares 52,898 52,486 Dilutive effect of common stock equivalents 723 781 Diluted weighted average common shares 53,621 53,267 Basic net income attributable to IPG Photonics Corporation per share $ 0.93 $ 1.09 Diluted net income attributable to IPG Photonics Corporation per share $ 0.92 $ 1.08 For the three months ended March 31, 2016 and 2015 , respectively, the computation of diluted weighted average common shares excludes common stock equivalents of 65,100 shares and 88,000 shares which includes restricted stock units ("RSUs") of 49,600 and 67,500 and performance stock units ("PSUs") of 15,000 and 0 , because the effect would be anti-dilutive.

Derivative Financial Instrument

Derivative Financial Instruments	3 Months Ended
	Mar. 31, 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 previously had a cash flow hedge which was an interest rate swap associated with a U.S. long-term note ("note"). The interest rate swap agreement terminated with the note, which matured in June 2015. The derivative gains and losses in the consolidated statements of income related to the Company's interest rate swap contract was as follows: Three Months Ended March 31, 2016 2015 Effective portion recognized in other comprehensive loss, pretax: Interest rate swap $ — $ 133 Effective portion reclassified from other comprehensive loss to interest expense, pretax: Interest rate swap $ — $ (67 ) Ineffective portion recognized in income: Interest rate swap $ — $ —

Fair Value Measurements

Fair Value Measurements	3 Months Ended
	Mar. 31, 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 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 carrying amounts of cash equivalents, short-term investments, accounts receivable, accounts payable, drawings on revolving lines of credit and the collateralized long-term note are considered reasonable estimates of their fair market value, due to the short maturity of these instruments or as a result of the competitive market interest rates, which have been negotiated. The following table presents information about the Company's assets and liabilities measured at fair value: Fair Value Measurements at March 31, 2016 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 368,725 $ 368,725 $ — $ — Short-term investments 126,217 126,217 — — Auction rate securities 1,138 — — 1,138 Total assets $ 496,080 $ 494,942 $ — $ 1,138 Liabilities Collateralized long-term note $ 19,167 $ 19,167 $ — $ — Contingent purchase consideration 21 — — 21 Total liabilities $ 19,188 $ 19,167 $ — $ 21 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 note $ 19,667 $ 19,667 $ — $ — Contingent purchase consideration 20 — — 20 Total liabilities $ 19,687 $ 19,667 $ — $ 20 Short-term investments are measured and recorded at book value as unrealized gains or losses are not adjusted since they 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 March 31, 2016 and December 31, 2015 was $126,217 and $106,375 , respectively, which represents an unrealized loss of $56 and $209 , respectively, as compared to the $126,273 and $106,584 , respectively 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 March 31, 2016 2015 Auction Rate Securities Balance, beginning of period $ 1,136 $ 1,128 Change in fair value and accretion 2 2 Balance, end of period $ 1,138 $ 1,130 Contingent Purchase Consideration Balance, beginning of period $ 20 $ 98 Change in fair value and currency fluctuations 1 (15 ) Balance, end of period $ 21 $ 83

Goodwill And Intangibles

Goodwill And Intangibles	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill And Intangibles	GOODWILL AND INTANGIBLES The carrying amount of goodwill was $502 and $505 on March 31, 2016 and December 31, 2015 , respectively. Intangible assets, subject to amortization, consisted of the following: March 31, 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 $ (4,661 ) $ 1,980 6 Years $ 6,641 $ (4,573 ) $ 2,068 6 Years Customer relationships 3,437 (3,213 ) 224 5 Years 3,325 (3,092 ) 233 5 Years Production know-how 6,734 (3,574 ) 3,160 8 Years 6,672 (3,339 ) 3,333 8 Years Technology, trademark and tradename 7,900 (2,198 ) 5,702 8 Years 8,247 (1,977 ) 6,270 8 Years $ 24,712 $ (13,646 ) $ 11,066 $ 24,885 $ (12,981 ) $ 11,904 Amortization expense for the three months ended March 31, 2016 and 2015 was $543 and $512 , 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 $1,837 $2,195 $2,130 $2,025 $1,324 $1,555 $11,066

Product Warranties

Product Warranties	3 Months Ended
	Mar. 31, 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 three months ended March 31, 2016 and 2015 . 2016 2015 Balance at January 1 $ 28,210 $ 19,272 Provision for warranty accrual 4,814 4,549 Warranty claims (3,562 ) (2,588 ) Foreign currency translation 780 (1,437 ) Balance at March 31 $ 30,242 $ 19,796 Accrued warranty reported in the accompanying consolidated financial statements as of March 31, 2016 and December 31, 2015 consisted of $13,501 and $14,871 in accrued expenses and other liabilities and $16,741 and $13,339 in other long-term liabilities, respectively.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	INCOME TAXES The company had no changes in total unrecognized tax benefits from the years ended December 31, 2015 and 2014, which included balances of $7,579 and $6,494 , respectively for the periods ended March 31, 2016 and 2015. Substantially all of the liability for uncertain tax benefits related to various federal, state and foreign income tax matters, would benefit the Company's effective tax rate, if recognized.

Commitments And Contingencies

Commitments And Contingencies	3 Months Ended
	Mar. 31, 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 March 31, 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. The Company has settled the lawsuit filed against it in November 2015 in the United States District Court for the Eastern District of Texas for alleged patent infringement. Subsequent to March 31, 2016, the Company entered into an agreement to purchase Menara Networks, Inc., a producer of enhanced optical transmission modules and systems for optical networks located in Dallas, Texas. The agreement calls for a cash purchase price of $46,750 , subject to closing adjustments. The purchase is expected to close during the second quarter of 2016. Also, subsequent to March 31, 2016, the Company entered into an agreement to purchase a building located in Marlborough, MA from a related party. The Company currently occupies a substantial portion of the building. The purchase price of the building, $23,750 , is expected to be financed entirely with debt. The purchase is expected to close during the second quarter of 2016.

Recent Accounting Pronounceme20

Recent Accounting Pronouncements (Policies)	3 Months Ended
	Mar. 31, 2016
Accounting Policies [Abstract]
New Accounting Pronouncements, Policy	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 Company is currently evaluating the impact that the standard will have on its consolidated financial statements. 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 on its consolidated financial statements. 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 on its consolidated financial statements. 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 valuation allowance 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 is currently assessing the impact of this amended guidance and the timing of adoption. 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 financial statements upon adoption.

Inventories (Tables)

Inventories (Tables)	3 Months Ended
	Mar. 31, 2016
Inventory Disclosure [Abstract]
Components Of Inventories	Inventories consist of the following: March 31, December 31, 2016 2015 Components and raw materials $ 81,922 $ 70,394 Work-in-process 39,648 43,259 Finished components and devices 105,337 90,085 Total $ 226,907 $ 203,738

Accrued Expenses And Other Li22

Accrued Expenses And Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2016
Payables and Accruals [Abstract]
Components Of Accrued Expenses And Other Liabilities	Accrued expenses and other liabilities consist of the following: March 31, December 31, 2016 2015 Accrued compensation $ 26,437 $ 33,617 Customer deposits and deferred revenue 23,427 21,525 Current portion of accrued warranty 13,501 14,871 Other 7,622 5,654 Total $ 70,987 $ 75,667

Financing Arrangements (Tables)

Financing Arrangements (Tables)	3 Months Ended
	Mar. 31, 2016
Debt Disclosure [Abstract]
Borrowings Under Existing Financing Arrangements	The Company's borrowings under existing financing arrangements consist of the following: March 31, December 31, 2016 2015 Revolving line-of-credit facilities: European overdraft facilities $ — $ — Euro line-of-credit — — U.S. line-of-credit — — Total $ — $ — Term debt: Collateralized long-term note $ 19,167 $ 19,667 Less: current portion (2,000 ) (2,000 ) Total long-term debt $ 17,167 $ 17,667

Net Income Attributable To IP24

Net Income Attributable To IPG Photonics Corporation Per Share (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 2015 Net income attributable to IPG Photonics Corporation $ 49,326 $ 57,359 Weighted average shares 52,898 52,486 Dilutive effect of common stock equivalents 723 781 Diluted weighted average common shares 53,621 53,267 Basic net income attributable to IPG Photonics Corporation per share $ 0.93 $ 1.09 Diluted net income attributable to IPG Photonics Corporation per share $ 0.92 $ 1.08

Derivative Financial Instrume25

Derivative Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Gains (Losses) In The Consolidated Statements Of Income Related To Interest Rate Swap Contracts	The derivative gains and losses in the consolidated statements of income related to the Company's interest rate swap contract was as follows: Three Months Ended March 31, 2016 2015 Effective portion recognized in other comprehensive loss, pretax: Interest rate swap $ — $ 133 Effective portion reclassified from other comprehensive loss to interest expense, pretax: Interest rate swap $ — $ (67 ) Ineffective portion recognized in income: Interest rate swap $ — $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 Total Level 1 Level 2 Level 3 Assets Cash equivalents $ 368,725 $ 368,725 $ — $ — Short-term investments 126,217 126,217 — — Auction rate securities 1,138 — — 1,138 Total assets $ 496,080 $ 494,942 $ — $ 1,138 Liabilities Collateralized long-term note $ 19,167 $ 19,167 $ — $ — Contingent purchase consideration 21 — — 21 Total liabilities $ 19,188 $ 19,167 $ — $ 21 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 note $ 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 March 31, 2016 2015 Auction Rate Securities Balance, beginning of period $ 1,136 $ 1,128 Change in fair value and accretion 2 2 Balance, end of period $ 1,138 $ 1,130 Contingent Purchase Consideration Balance, beginning of period $ 20 $ 98 Change in fair value and currency fluctuations 1 (15 ) Balance, end of period $ 21 $ 83

Goodwill And Intangibles (Table

Goodwill And Intangibles (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets	Intangible assets, subject to amortization, consisted of the following: March 31, 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 $ (4,661 ) $ 1,980 6 Years $ 6,641 $ (4,573 ) $ 2,068 6 Years Customer relationships 3,437 (3,213 ) 224 5 Years 3,325 (3,092 ) 233 5 Years Production know-how 6,734 (3,574 ) 3,160 8 Years 6,672 (3,339 ) 3,333 8 Years Technology, trademark and tradename 7,900 (2,198 ) 5,702 8 Years 8,247 (1,977 ) 6,270 8 Years $ 24,712 $ (13,646 ) $ 11,066 $ 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 $1,837 $2,195 $2,130 $2,025 $1,324 $1,555 $11,066

Product Warranties (Tables)

Product Warranties (Tables)	3 Months Ended
	Mar. 31, 2016
Product Warranties Disclosures [Abstract]
Summary Of Product Warranty Activity	The following table summarizes product warranty activity recorded during the three months ended March 31, 2016 and 2015 . 2016 2015 Balance at January 1 $ 28,210 $ 19,272 Provision for warranty accrual 4,814 4,549 Warranty claims (3,562 ) (2,588 ) Foreign currency translation 780 (1,437 ) Balance at March 31 $ 30,242 $ 19,796

Inventories (Components Of Inve

Inventories (Components Of Inventories) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Inventory Disclosure [Abstract]
Components and raw materials	$ 81,922		$ 70,394
Work-in-process	39,648		43,259
Finished components and devices	105,337		90,085
Total	226,907		$ 203,738
Inventory provisions	$ 3,953	$ 3,326

Accrued Expenses And Other Li30

Accrued Expenses And Other Liabilities (Components Of Accrued Expenses And Other Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued compensation	$ 26,437	$ 33,617
Customer deposits and deferred revenue	23,427	21,525
Current portion of accrued warranty	13,501	14,871
Other	7,622	5,654
Total	$ 70,987	$ 75,667

Financing Arrangements (Borrowi

Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details) - USD ($)	Oct. 31, 2019	Mar. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Revolving line-of-credit facilities:		$ 0	$ 0
Term debt:
Less: current portion		(2,000,000)	(2,000,000)
Total long-term debt		17,167,000	17,667,000
U.S. line-of-credit
Debt Instrument [Line Items]
Revolving line-of-credit facilities:		0	0
European overdraft facilities
Debt Instrument [Line Items]
Revolving line-of-credit facilities:		0	0
Euro line-of-credit
Debt Instrument [Line Items]
Revolving line-of-credit facilities:		0	0
Term debt:
Guarantees issued		7,173,000	8,221,000
Amount drawn on line of credit		0	0
Collateralized long-term note
Term debt:
Collateralized long-term note		19,167,000	19,667,000
Collateralized long-term note | Collateralized long-term note
Term debt:
Amount due on collateralized long-term note		19,167,000
Current portion of collateralized long-term note		$ 2,000,000
Interest rate percentage		2.81%
Collateralized long-term note | Collateralized long-term note | Scenario, Forecast
Term debt:
Amount due on collateralized long-term note	$ 12,000,000
US Long Term Note
Term debt:
Guarantees issued		$ 110,000	2,828,000
Amount drawn on line of credit		$ 0	$ 0

Net Income Attributable To IP32

Net Income Attributable To IPG Photonics Corporation Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Earnings Per Share [Abstract]
Net income attributable to IPG Photonics Corporation (in dollars)	$ 49,326	$ 57,359
Weighted average shares	52,898,000	52,486,000
Dilutive effect of common stock equivalents	723,000	781,000
Diluted weighted average common shares	53,621,000	53,267,000
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 0.93	$ 1.09
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 0.92	$ 1.08
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares	65,100,000	88,000,000
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares	49,600,000	67,500,000
PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from computation of diluted weighted average common shares	15,000,000	0

Derivative Financial Instrume33

Derivative Financial Instruments (Fair Value Of Cash Flow Hedges) (Details)	Mar. 31, 2016USD ($)
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	$ 0

Derivative Financial Instrume34

Derivative Financial Instruments (Derivative Gains (Losses) In The Consolidated Statements Of Income Related To Interest Rate Swap Contracts) (Details) - Interest rate swap - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion recognized in other comprehensive loss, pretax:	$ 0	$ 133
Effective portion reclassified from other comprehensive loss to interest expense, pretax:	0	(67)
Ineffective portion recognized in income:	$ 0	$ 0

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilities Measured At Fair Value) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 496,080	$ 321,743
Liabilities	19,188	19,687
Short-term investments	126,273	106,584
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	494,942	320,607
Liabilities	19,167	19,667
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	0	0
Liabilities	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,138	1,136
Liabilities	21	20
Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	368,725	214,232
Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	368,725	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	126,217	106,375
Short-term investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	126,217	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
Auction rate securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	1,138	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	1,138	1,136
Collateralized long-term note
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	19,167	19,667
Collateralized long-term note | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	19,167	19,667
Collateralized long-term note | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities	0	0
Collateralized long-term note | 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	21	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	21	20
Held-to-maturity Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable Securities, Unrealized Gain (Loss)	$ 56	$ 209

Fair Value Measurements (Fair V

Fair Value Measurements (Fair Value Of Auction Rate Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Auction Rate Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 1,136	$ 1,128
Change in fair value and accretion	2	2
Balance, end of period	1,138	1,130
Contingent Purchase Consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	20	98
Change in fair value and currency fluctuations	1	(15)
Balance, end of period	$ 21	$ 83

Goodwill And Intangibles (Narra

Goodwill And Intangibles (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Carrying amount of goodwill	$ 502		$ 505
Amortization expense	$ 543	$ 512

Goodwill And Intangibles (Intan

Goodwill And Intangibles (Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 24,712	$ 24,885
Accumulated Amortization	(13,646)	(12,981)
Net Carrying Amount	11,066	11,904
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,641	6,641
Accumulated Amortization	(4,661)	(4,573)
Net Carrying Amount	$ 1,980	$ 2,068
Weighted- Average Lives	6 years	6 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 3,437	$ 3,325
Accumulated Amortization	(3,213)	(3,092)
Net Carrying Amount	$ 224	$ 233
Weighted- Average Lives	5 years	5 years
Production know-how
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 6,734	$ 6,672
Accumulated Amortization	(3,574)	(3,339)
Net Carrying Amount	$ 3,160	$ 3,333
Weighted- Average Lives	8 years	8 years
Technology, trademark and tradename
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 7,900	$ 8,247
Accumulated Amortization	(2,198)	(1,977)
Net Carrying Amount	$ 5,702	$ 6,270
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, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
2,016	$ 1,837
2,017	2,195
2,018	2,130
2,019	2,025
2,020	1,324
Thereafter	1,555
Net Carrying Amount	$ 11,066	$ 11,904

Product Warranties (Narrative)

Product Warranties (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Product Warranty Liability [Line Items]
Accrued warranty reported in accrued expenses and other liabilities	$ 13,501	$ 14,871
Accrued warranty reported in other long-term liabilities	$ 16,741	$ 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	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 28,210	$ 19,272
Provision for warranty accrual	4,814	4,549
Warranty claims	(3,562)	(2,588)
Foreign currency translation	780	(1,437)
Balance at March 31	$ 30,242	$ 19,796

Income Taxes (Details)

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

Commitments And Contingencies C

Commitments And Contingencies Commitments And Contingencies (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Mar. 31, 2015
Business Acquisition [Line Items]
Payments to acquire property, plant, and equipment		$ 24,960	$ 14,027
Scenario, Forecast
Business Acquisition [Line Items]
Payments to acquire property, plant, and equipment	$ 23,750
Menara Networks | Scenario, Forecast
Business Acquisition [Line Items]
Business combination, consideration transferred	$ 46,750