10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

__________________________________________

FORM 10-Q

__________________________________________

ý QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2013

OR

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission File Number 001-33155

IPG PHOTONICS CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	04-3444218
(State or other jurisdiction of	(I.R.S. Employer
incorporation or organization)	Identification Number)
50 Old Webster Road, Oxford, Massachusetts	01540
(Address of principal executive offices)	(Zip code)

(508) 373-1100

(Registrant’s telephone number, including area code)

__________________________________________

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    YES  ý    NO  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data file required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    YES  ý    NO  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer”, “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large Accelerated Filer	ý	Accelerated Filer	¨
Non-Accelerated Filer	¨	Smaller Reporting Company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    YES  ¨    NO  ý

As of November 5, 2013, there were 51,680,453 shares of the registrant’s common stock issued and outstanding.

TABLE OF CONTENTS

	Page
Part I. Financial Information	1
Item 1. Financial Statements	1
Consolidated Balance Sheets: September 30, 2013 and December 31, 2012	1
Consolidated Statements of Income: Three and Nine Months Ended September 30, 2013 and 2012	2
Consolidated Statements of Comprehensive Income: Three and Nine Months Ended September 30, 2013 and 2012	3
Consolidated Statements of Cash Flows: Nine Months Ended September 30, 2013 and 2012	4
Consolidated Statements of Equity: Nine Months Ended September 30, 2013 and 2012	5
Notes to Consolidated Financial Statements	6
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations	13
Item 3. Quantitative and Qualitative Disclosures About Market Risk	19
Item 4. Controls and Procedures	20
Part II. Other Information	21
Item 1. Legal Proceedings	21
Item 1A. Risk Factors	21
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	21
Item 3. Defaults Upon Senior Securities	21
Item 4. Mine Safety Disclosures	21
Item 5. Other Information	21
Item 6. Exhibits	21
Signatures	23
EX-12.1 STATEMENT RE COMPUTATION OF EARNINGS TO FIXED CHARGES
EX-31.1 CERTIFICATION OF CEO PURSUANT TO RULE 13a-14(a)
EX-31.2 CERTIFICATION OF CFO PURSUANT TO RULE 13a-14(a)
EX-32 CERTIFICATION OF CEO AND CFO PURSUANT TO SECTION 1350
EX-101.INS XBRL INSTANCE DOCUMENT
EX-101.SCH XBRL TAXONOMY EXTENSION SCHEMA
EX-101.CAL XBRL TAXONOMY EXTENSION CALCULATION LINKBASE
EX-101.LAB XBRL TAXONOMY EXTENSION LABEL LINKBASE
EX-101.PRE XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
EX-101.DEF XBRL TAXONOMY EXTENSION DEFINITION LINKBASE

PART I-FINANCIAL INFORMATION

ITEM 1. UNAUDITED INTERIM FINANCIAL STATEMENTS

IPG PHOTONICS CORPORATION

CONSOLIDATED BALANCE SHEETS

	September 30,			December 31,
	2013			2012
	(In thousands, except share and per share data)
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	398,355		$	384,053
Accounts receivable, net	120,640			96,630
Inventories	171,268			139,618
Prepaid income taxes and income taxes receivable	17,326			13,071
Prepaid expenses and other current assets	30,072			18,639
Deferred income taxes, net	11,547			12,948
Total current assets	749,208			664,959
DEFERRED INCOME TAXES, NET	6,100			2,107
GOODWILL	455			2,898
INTANGIBLE ASSETS, NET	10,131			7,510
PROPERTY, PLANT AND EQUIPMENT, NET	236,507			210,563
OTHER ASSETS	7,395			7,461
TOTAL	$	1,009,796		$	895,498
LIABILITIES AND EQUITY
CURRENT LIABILITIES:
Revolving line-of-credit facilities	$	1,547		$	2,442
Current portion of long-term debt	1,333			1,505
Accounts payable	14,293			17,783
Accrued expenses and other liabilities	59,553			51,451
Deferred income taxes, net	2,050			9,831
Income taxes payable	27,031			42,443
Total current liabilities	105,807			125,455
DEFERRED INCOME TAXES AND OTHER LONG-TERM LIABILITIES	16,635			13,102
LONG-TERM DEBT, NET OF CURRENT PORTION	11,667			14,014
Total liabilities	134,109			152,571
COMMITMENTS AND CONTINGENCIES (NOTE 12)
IPG PHOTONICS CORPORATION STOCKHOLDERS’ EQUITY:
Common stock, $0.0001 par value, 175,000,000 shares authorized; 51,604,568 shares issued and outstanding at September 30, 2013; 51,359,247 shares issued and outstanding at December 31, 2012	5			5
Additional paid-in capital	526,481			511,039
Retained earnings	354,162			234,977
Accumulated other comprehensive loss	(4,961		)	(3,094		)
Total IPG Photonics Corporation stockholders’ equity	875,687			742,927
TOTAL	$	1,009,796		$	895,498

See notes to consolidated financial statements.

1

IPG PHOTONICS CORPORATION

CONSOLIDATED STATEMENTS OF INCOME

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
	(in thousands, except per share data)
NET SALES	$	172,152		$	156,379		$	482,175		$	417,498
COST OF SALES	79,339			70,420			223,799			187,945
GROSS PROFIT	92,813			85,959			258,376			229,553
OPERATING EXPENSES:
Sales and marketing	6,801			5,785			19,514			16,771
Research and development	11,501			7,762			30,782			22,131
General and administrative	13,175			10,609			37,814			29,294
Loss (gain) on foreign exchange	1,563			1,796			972			(272		)
Total operating expenses	33,040			25,952			89,082			67,924
OPERATING INCOME	59,773			60,007			169,294			161,629
OTHER INCOME (EXPENSE), Net:
Interest income (expense), net	63			55			(25		)	541
Other income (expense), net	218			205			49			(981		)
Total other income (expense)	281			260			24			(440		)
INCOME BEFORE PROVISION FOR INCOME TAXES	60,054			60,267			169,318			161,189
PROVISION FOR INCOME TAXES	(17,716		)	(17,832		)	(50,133		)	(48,357		)
NET INCOME	42,338			42,435			119,185			112,832
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	—			—			—			2,740
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION	$	42,338		$	42,435		$	119,185		$	110,092
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE:
Basic	$	0.82		$	0.83		$	2.32		$	2.20
Diluted	$	0.81		$	0.81		$	2.28		$	2.16
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic	51,495			51,090			51,474			50,204
Diluted	52,367			52,102			52,346			51,281

See notes to consolidated financial statements.

2

IPG PHOTONICS CORPORATION

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Three Months Ended September 30,				Nine Months Ended September 30,
	2013		2012		2013			2012
					(In thousands)
Net income	$	42,338	$	42,435	$	119,185		$	112,832
Other comprehensive income (loss), net of tax:
Translation adjustments	11,892		10,479		(2,094		)	3,676
Unrealized gain on derivatives	53		24		227			130
Total other comprehensive income (loss)	11,945		10,503		(1,867		)	3,806
Comprehensive income	54,283		52,938		117,318			116,638
Comprehensive income attributable to noncontrolling interest & redeemable noncontrolling interest	—		—		—			1,908
Comprehensive income attributable to IPG Photonics Corporation	$	54,283	$	52,938	$	117,318		$	114,730

See notes to consolidated financial statements.

3

IPG PHOTONICS CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Nine Months Ended September 30,
	2013			2012
	(In thousands)
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	119,185		$	112,832
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,414			19,168
Deferred income taxes	(7,591		)	2,705
Stock-based compensation	8,604			6,358
Gains on foreign currency transactions	972			1,484
Other	369			38
Provisions for inventory, warranty & bad debt	18,203			14,762
Changes in assets and liabilities that (used) provided cash:
Accounts receivable	(26,942		)	(36,514		)
Inventories	(43,705		)	(17,050		)
Prepaid expenses and other current assets	(3,478		)	(3,335		)
Accounts payable	(2,008		)	2,170
Accrued expenses and other liabilities	2,734			(1,281		)
Income and other taxes payable	(25,186		)	19,038
Tax benefit from exercise of employee stock options	(3,610		)	(3,870		)
Net cash provided by operating activities	60,961			116,505
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(48,333		)	(51,715		)
Proceeds from sales of property, plant and equipment	202			—
Proceeds from short-term investments	—			25,452
Acquisition of businesses	(5,555		)	(11,596		)
Other	442			(313		)
Net cash used in investing activities	(53,244		)	(38,172		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line-of-credit facilities	14,124			9,647
Payments on line-of-credit facilities	(15,019		)	(11,605		)
Purchase of noncontrolling interests	—			(700		)
Purchase of redeemable noncontrolling interests	—			(55,400		)
Principal payments on long-term borrowings	(2,519		)	(1,848		)
Exercise of employee stock options and issuances under employee stock purchase plan	3,228			4,275
Tax benefit from exercise of employee stock options	3,610			3,870
Proceeds from follow-on public offering, net of offering expenses	—			167,963
Net cash provided by financing activities	3,424			116,202
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	3,161			(2,200		)
NET INCREASE IN CASH AND CASH EQUIVALENTS	14,302			192,335
CASH AND CASH EQUIVALENTS — Beginning of period	384,053			180,234
CASH AND CASH EQUIVALENTS — End of period	$	398,355		$	372,569
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	$	190		$	553
Cash paid for income taxes	$	74,107		$	20,967
Non-cash transactions:
Demonstration units transferred from inventory to other assets	$	3,185		$	2,098
Amounts related to acquisition of businesses included in accounts payable and accrued expenses and other long-term liabilities	$	—		$	2,444
Additions to property, plant and equipment included in accounts payable	$	679		$	545

See notes to consolidated financial statements.

4

IPG PHOTONICS CORPORATION

CONSOLIDATED STATEMENTS OF EQUITY

	Nine Months Ended September 30,
	2013				2012
	(In thousands, except share and per share data)
	Shares	Amount			Shares	Amount
COMMON STOCK
Balance, beginning of year	51,359,247	$	5		47,616,115	$	5
Exercise of stock options	231,408	—			385,428	—
Common stock issued under employee stock purchase plan	13,913	—			18,654	—
Common stock issued in a public offering	—	—			3,250,000	—
Balance, end of period	51,604,568	5			51,270,197	5
ADDITIONAL PAID-IN CAPITAL
Balance, beginning of year		511,039				332,585
Stock-based compensation		8,604				6,358
Exercise of stock options and related tax benefit from exercise		6,120				7,585
Common stock issued under employee stock purchase plan		718				560
Purchase of redeemable noncontrolling interests ("NCI")		—				(7,794		)
Common stock issued in follow-on public offering		—				167,964
Premium on purchase of NCI		—				(404		)
Balance, end of period		526,481				506,854
RETAINED EARNINGS
Balance, beginning of year		234,977				122,833
Net income attributable to IPG Photonics Corporation		119,185				110,092
Adjustments to redemption value of redeemable NCI		—				493
Balance, end of period		354,162				233,418
ACCUMULATED OTHER COMPREHENSIVE LOSS
Balance, beginning of year		(3,094		)		(12,100		)
Translation adjustments		(2,094		)		3,676
Unrealized gain on derivatives, net of tax		227				130
Purchase of NCI & redeemable NCI		—				(3,243		)
Attribution to NCI & redeemable NCI		—				832
Balance, end of period		(4,961		)		(10,705		)
TOTAL IPG PHOTONICS CORPORATION STOCKHOLDERS’ EQUITY		875,687				729,572
NONCONTROLLING INTERESTS
Balance, beginning of year		—				287
Sale of NCI		—				(700		)
Other comprehensive income attributable to NCI		—				9
Premium on purchase of NCI		—				404
Balance, end of period		—				—
TOTAL STOCKHOLDERS' EQUITY		$	875,687			$	729,572

See notes to consolidated financial statements.

5

IPG PHOTONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(In thousands, except share and per share data)

1. BASIS OF PRESENTATION

The accompanying unaudited consolidated financial statements have been prepared by IPG Photonics Corporation, or “IPG”, “we”, “our”, “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, 2012.

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.

2. RECENT ACCOUNTING PRONOUNCEMENTS

Accounting standards that have been issued or proposed by the FASB or other standards-setting bodies that do not require

adoption until a future date are not expected to have a material impact on the Company's financial statements upon adoption.

3. INVENTORIES

Inventories consist of the following:

	September 30,		December 31,
	2013		2012
Components and raw materials	$	56,738	$	53,436
Work-in-process	60,391		46,240
Finished goods	54,139		39,942
Total	$	171,268	$	139,618

The Company recorded inventory provisions totaling $4,286 and $2,486 for the three months ended September 30, 2013 and 2012, respectively, and $7,842 and $6,129 for the nine months ended September 30, 2013 and 2012, 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 goods.

4. ACCRUED EXPENSES AND OTHER LIABLILITES

Accrued expenses and other liabilities consist of the following:

	September 30,		December 31,
	2013		2012
Accrued compensation	$	24,863	$	21,972
Customer deposits and deferred revenue	19,929		17,174
Current portion of accrued warranty	7,697		7,838
Other	7,064		4,467
Total	$	59,553	$	51,451

6

IPG PHOTONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(In thousands, except share and per share data)

5. FINANCING ARRANGEMENTS

The Company’s borrowings under existing financing arrangements consist of the following:

	September 30,			December 31,
	2013			2012
Revolving line-of-credit facilities:
European overdraft facilities	$	820		$	1,135
Euro line of credit	727			956
U.S. line of credit	—			351
Total	$	1,547		$	2,442
Term debt:
U.S. long-term note	$	13,000		$	14,000
Other notes payable	—			1,519
Less: current portion	(1,333		)	(1,505		)
Total long-term debt	$	11,667		$	14,014

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.

6. 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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Net income attributable to IPG Photonics Corporation	$	42,338	$	42,435	$	119,185	$	110,092
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		493
Net income attributable to common stockholders	42,338		42,435		119,185		110,585
Weighted average shares	51,495		51,090		51,474		50,204
Dilutive effect of common stock equivalents	872		1,012		872		1,077
Diluted weighted average common shares	52,367		52,102		52,346		51,281
Basic net income attributable to IPG Photonics Corporation per share	$	0.82	$	0.83	$	2.32	$	2.19
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		0.01
Basic net income attributable to common stockholders	$	0.82	$	0.83	$	2.32	$	2.20
Diluted net income attributable to IPG Photonics Corporation per share	$	0.81	$	0.81	$	2.28	$	2.15
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		0.01
Diluted net income attributable to common stockholders	$	0.81	$	0.81	$	2.28	$	2.16

The computation of diluted weighted average common shares excludes options to purchase 31,000 shares and 75,000 shares for the three months ended September 30, 2013 and 2012, respectively, and 210,000 shares and 9,000 shares for the nine months ended September 30, 2013 and 2012, respectively, because the effect would be anti-dilutive.

The Company computes net income per share in accordance with ASC 260-Earnings Per Share. Under the provisions of ASC 260, the Company is required to present basic and diluted earnings per share information separately for each class of equity instruments that participate in any income distribution with primary equity instruments. The Company calculates earnings per share in periods where a class of common stock was redeemable for other than fair value through the application of the two-class method. Until June 29, 2012, the Company had redeemable noncontrolling interests reported in the accompanying consolidated financial statements related to a 22.5% minority interest of the Company's subsidiary, NTO IRE-Polus.

7

IPG PHOTONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(In thousands, except share and per share data)

7. DERIVATIVE FINANCIAL 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 used foreign currency forward contracts as cash flow hedges of forecasted intercompany settlements denominated in foreign currencies of major industrial countries. The Company has no outstanding foreign currency forward contracts. The Company has interest rate swaps that are classified as a cash flow hedge of its variable rate debt. The Company has no derivatives that are not accounted for as a hedging instrument.

Cash flow hedges– The Company’s cash flow hedges are interest rate swaps under which it pays fixed rates of interest. The fair value amounts in the consolidated balance sheet were:

	Notional Amounts1				Other Assets				Other Long-Term Liabilities
	September 30,		December 31,		September 30,		December 31,		September 30,		December 31,
	2013		2012		2013		2012		2013		2012
Interest rate swap	$	13,000	$	14,000	$	—	$	—	$	493	$	855
Total	$	13,000	$	14,000	$	—	$	—	$	493	$	855

(1) Notional amounts represent the gross contract/notional amount of the derivatives outstanding.

The derivative gains (losses) in the consolidated statements of income related to the Company’s interest rate swap contracts were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Effective portion recognized in other comprehensive gain (loss), pretax:
Interest rate swap	$	186		$	219		$	733		$	667
Effective portion reclassified from other comprehensive gain (loss) to interest expense, pretax:
Interest rate swap	$	(101	)	$	(140	)	$	(371	)	$	(436	)
Ineffective portion recognized in income:
Interest rate swap	$	—		$	—		$	—		$	—

8. FAIR VALUE MEASUREMENTS

The Company’s financial instruments consist of cash equivalents, accounts receivable, auction rate securities, accounts payable, drawings on revolving lines of credit, long-term debt and certain derivative instruments.

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, accounts receivable, accounts payable and drawings on revolving lines of credit are considered reasonable estimates of their fair market value, due to the short maturity of these instruments or as a result of the competitive market interest rates, which have been negotiated. If measured at fair value, accounts receivable and accounts payable would be classified as Level 3 and drawings on the revolving lines of credit would be classified as Level 2.

The following table presents information about the Company’s cash equivalents and assets and liabilities measured at fair value:

8

IPG PHOTONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(In thousands, except share and per share data)

			Fair Value Measurements at September 30, 2013
	Total		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	219,248	$	219,248	$	—	$	—
Auction rate securities	1,118		—		—		1,118
Total assets	$	220,366	$	219,248	$	—	$	1,118
Liabilities
Contingent purchase consideration	$	375	$	—	$	—	$	375
Interest rate swaps	493		—		493		—
Total liabilities	$	868	$	—	$	493	$	375
			Fair Value Measurements at December 31, 2012
	Total		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	237,049	$	237,049	$	—	$	—
Auction rate securities	1,112		—		—		1,112
Total assets	$	238,161	$	237,049	$	—	$	1,112
Liabilities
Contingent purchase consideration	$	3,023	$	—	$	—	$	3,023
Interest rate swaps	855		—		855		—
Total liabilities	$	3,878	$	—	$	855	$	3,023

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 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 consideration.

During the second quarter of 2013, the Company reduced the fair value of the accrued contingent purchase consideration associated with a 2012 purchase of a manufacturer of laser-based systems by $2,463 as management assessed that there was no possibility that any earn-out amounts included in the purchase agreement with the former owners would be achieved (see Note 9). During the third quarter of 2013, the Company reduced the fair value of the accrued contingent purchase consideration associated with a 2011 purchase of a technology developer by $196. These adjustments are included in total other (expense) income, net.

During the first quarter of 2012, the Company determined a final payment of contingent consideration and other related matters in association with the purchase of a technology company in 2010, increased the liability by $987 and reclassed the revised obligation to accrued expenses. The adjustment was included in total other (expense) income, net. As the payment was then fixed, it was no longer measured at its fair value.

Also, during the nine months ended September 30, 2012, the Company terminated a warrant held by a former investor in NTO IRE-Polus as part of the redemption of the investor's redeemable noncontrolling interest for its fair value of $77.

9

IPG PHOTONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(In thousands, except share and per share data)

	Three Months Ended September 30,					Nine Months Ended September 30,
	2013			2012		2013			2012
Auction Rate Securities
Balance, beginning of period	$	1,116		$	1,108	$	1,112		$	1,104
Period transactions	—			—		—			—
Change in fair value	2			2		6			6
Redeemed by issuers at par	—			—		—			—
Balance, end of period	$	1,118		$	1,110	$	1,118		$	1,110
Contingent Purchase Consideration
Balance, beginning of period	$	559		$	597	$	3,023		$	999
Period transactions	—			1,847		—			1,847
Adjustment for determination of final payment	—			—		—			987
Change in fair value	(184		)	—		(2,648		)	28
Reclass of determined final payment	—			—		—			(1,417		)
Balance, end of period	$	375		$	2,444	$	375		$	2,444
Warrant
Balance, beginning of period	$	—		$	—	$	—		$	77
Period transactions	—			—		—			(77		)
Change in fair value	—			—		—			—
Balance, end of period	$	—		$	—	$	—		$	—

9. GOODWILL AND INTANGIBLES

The following table sets forth the changes in the carrying amount of goodwill for the nine months ended September 30, 2013:

	Amounts
Balance at January 1	$	2,898
Adjustment	(95		)
Impairment	(2,803		)
Total goodwill arising from acquisition	455
Balance at September 30	$	455

Intangible assets, subject to amortization, consisted of the following:

	September 30, 2013								December 31, 2012
	Gross  Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted- Average  Lives	Gross  Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted- Average  Lives
Patents	$	4,667	$	(4,066	)	$	601	6 Years	$	4,664	$	(4,193	)	$	471	6 Years
Customer relationships	4,054		(3,101		)	953		5 Years	3,993		(2,363		)	1,630		5 Years
Production know-how	7,029		(1,494		)	5,535		8 Years	2,514		(656		)	1,858		9 Years
Technology, trademark and tradename	4,249		(1,207		)	3,042		8 Years	4,229		(678		)	3,551		8 Years
	$	19,999	$	(9,868	)	$	10,131		$	15,400	$	(7,890	)	$	7,510

On March 13, 2013, the Company acquired the working capital and long term assets of Mobius Photonics Inc., a manufacturer of high-power pulsed ultra-violet ("UV") fiber lasers for micro-machining and fine processing applications. As a result of the acquisition, the Company recorded intangible assets of $4,480 of which all related to technology and know-how. Additionally, the Company recorded $455 of goodwill related to expected synergies for the Company's expansion of product offerings with UV and short pulsed fiber lasers.

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IPG PHOTONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(In thousands, except share and per share data)

Amortization expense for the three months ended September 30, 2013 and 2012 was $596 and $572, respectively. Amortization expense for the nine months ended September 30, 2013 and 2012 was $1,705 and $1,669, respectively.The estimated future amortization expense for intangibles for the remainder of 2013 and subsequent years is as follows:

2013	2014	2015	2016	2017	Thereafter	Total
$596	$2,047	$1,637	$1,451	$1,451	$2,949	$10,131

In accordance with ASC 350-Intangibles-Goodwill and Other, the Company assesses the impairment of its long-lived assets including its definite-lived intangible assets and goodwill, at least annually for goodwill, and whenever changes in events or circumstances indicate that the carrying value of such assets may not be recoverable. During each reporting period, the Company assesses for factors that may be present which would cause an impairment review.

 During the second quarter of 2013, the Company undertook an impairment analysis of long-lived assets and goodwill related to IPG Microsystems ("IPGM"), the assets of which were acquired in September 2012. The Company undertook the analysis because of certain qualitative factors including a decline in sales and bookings due to underlying weakness in the markets IPGM serves.

The Company performed an impairment analysis to assess whether there was impairment of long-lived assets of IPGM including identifiable intangibles included in the table above using the guidance in ASU 360-10-35. The Company concluded that no impairment existed as the undiscounted cash flows from IPGM are forecasted to be greater than the carrying value of identified long-lived assets.

The Company carried out the two-step goodwill impairment test in accordance with the provisions of ASU 350-20-35. That analysis indicated that the fair value of IPGM, based on a discounted cash flow analysis, was less than the carrying value. The implied value of goodwill, as measured in step 2, was zero. Accordingly, the Company adjusted the value of goodwill associated with IPGM to $0. The adjustment was included in total other (expense) income, net.

10. 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 nine months ended September 30, 2013 and 2012.

	2013			2012
Balance at January 1	$	10,714		$	8,631
Provision for warranty accrual	7,867			6,548
Warranty claims and other reductions	(4,977		)	(4,775		)
Foreign currency translation	136			(14		)
Balance at September 30	$	13,740		$	10,390

Accrued warranty reported in the accompanying consolidated financial statements as of September 30, 2013 and December 31, 2012 consist of $7,697 and $7,838 in accrued expenses and other liabilities and $6,043 and $2,876 in other long-term liabilities, respectively.

11. INCOME TAXES

A reconciliation of the total amounts of unrecognized tax benefits is as follows:

	2013			2012
Balance at January 1	$	5,392		$	4,509
Reductions of prior period positions	(63		)	—
Additions for tax positions in prior period	—			—
Additions for tax positions in current period	293			556
Balance at September 30	$	5,622		$	5,065

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IPG PHOTONICS CORPORATION

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - (Continued)

(In thousands, except share and per share data)

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.

12. 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. In August 2013, the Company was sued for misappropriation of certain trade secrets, unfair trade practices, and correction of inventorship on a patent owned by the Company related to beam couplers and beam switches. The plaintiff seeks damages in an unspecified amount, double damages for misappropriation of trade secrets and treble damages for unfair trade practices. The Company has filed to dismiss the trade secret misappropriation claims. The Company intends to vigorously defend the claims. At this time, no loss is deemed probable and no amounts have been accrued in respect of this contingency.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

You should read the following discussion in conjunction with our consolidated financial statements and related notes included elsewhere in this Quarterly Report on Form 10-Q. This discussion contains forward looking statements that are based on management’s current expectations, estimates and projections about our business and operations. Our actual results may differ materially from those currently anticipated and expressed in such forward-looking statements. See “Cautionary Statement Regarding Forward-Looking Statements.”

Overview

We develop and manufacture a broad line of high-performance fiber lasers, fiber amplifiers and diode lasers that are used in numerous applications, primarily in materials processing. We sell our products globally to original equipment manufacturers ("OEMs"), system integrators and end users. We market our products internationally primarily through our direct sales force.

We are vertically integrated such that we design and manufacture most of our key components used in our finished products, from semiconductor diodes to optical fiber preforms, finished fiber lasers and amplifiers. We also manufacture certain complementary products used with our lasers, including optical delivery cables, fiber couplers, beam switches, optical heads and chillers. In addition, we offer laser-based systems for certain markets and applications.

Factors and Trends That Affect Our Operations and Financial Results

In reading our financial statements, you should be aware of the following factors and trends that our management believes are important in understanding our financial performance.

Net sales. We derive net sales primarily from the sale of fiber lasers and amplifiers. We also sell diode lasers, communications systems, laser systems and complementary products. We sell our products through our direct sales organization and our network of distributors and sales representatives, as well as system integrators. We sell our products to OEMs that supply materials processing laser systems, communications systems and medical laser systems to end users. We also sell our products to end users that build their own systems which incorporate our products or use our products as an energy or light source. Our scientists and engineers work closely with OEMs, systems integrators and end users to analyze their system requirements and match appropriate fiber laser or amplifier specifications. Our sales cycle varies substantially, ranging from a period of a few weeks to as long as one year or more, but is typically several months.

Sales of our products generally are recognized upon shipment, provided that no obligations remain and collection of the receivable is reasonably assured. Our sales typically are made on a purchase order basis rather than through long-term purchase commitments.

We develop our products to standard specifications and use a common set of components within our product architectures. Our major products are based upon a common technology platform. We continually enhance these and other products by improving their components and developing new components and new product designs.

The average selling prices of our products generally decrease as the products mature. These decreases result from factors such as decreased manufacturing costs and increases in unit volumes, increased competition, the introduction of new products and market share considerations. In the past, we have lowered our selling prices in order to penetrate new markets and applications. Furthermore, we may negotiate discounted selling prices from time to time with certain customers that purchase multiple units.

Gross margin. Our total gross margin in any period can be significantly affected by total net sales in any period, by product mix, that is, the percentage of our revenue in the period that is attributable to higher or lower-power products, by sales mix between OEM customers and other customers, by mix of sales in different geographies and by other factors, some of which are not under our control.

Our product mix affects our margins because the selling price per watt is generally higher for low, mid-power devices and certain specialty products than for high-power devices sold in large volumes. The overall cost of high-power lasers may be partially offset by improved absorption of fixed overhead costs associated with sales of larger volumes of higher-power products because they use a greater number of optical components and drive economies of scale in manufacturing. Also, the profit margins on systems can be lower than margins for our laser and amplifier sources, depending on the configuration, volume and competitive forces, among other factors.

The mix of sales between OEM customers and other customers can affect gross margin because we provide sales price discounts on products based on the number of units ordered. As the number of OEM customers increases and the number of

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units ordered increases, the average sales price per unit will be reduced. We expect that the impact of reduced sales price per unit will be offset by the manufacturing efficiency provided by high unit volume orders, but the timing and extent of achieving these efficiencies may not always match the mix of sales in any given time period.

A high proportion of our costs is fixed so they are generally difficult or slow to adjust in response to changes in demand. In addition, our fixed costs increase as we expand our capacity. If we expand capacity faster than is required by sales growth, gross margins could be negatively affected. Gross margins generally decline if production volumes are lower as a result of a decrease in sales or a reduction in inventory because the absorption of fixed manufacturing costs will be reduced. Gross margins generally improve when the opposite occurs. If both sales and inventory decrease in the same period, the decline in gross margin may be greater if we cannot reduce fixed costs or choose not to reduce fixed costs to match the decrease in the level of production. If we experience a decline in sales that reduces absorption of our fixed costs, or if we have production issues or inventory write-downs, our gross margins will be negatively affected.

We also regularly review our inventory for items that are slow-moving, have been rendered obsolete or determined to be excess. Any write-off of such slow-moving, obsolete or excess inventory affects our gross margins. For example, we recorded provisions for inventory totaling $4.2 million and $2.5 million for the three months ended September 30, 2013 and 2012, respectively, and $7.8 million and $6.1 million for the nine months ended September 30, 2013 and 2012, respectively, and $8.2 million, $6.1 million and $2.7 million for the years ended December 31, 2012, 2011 and 2010, respectively.

Sales and marketing expense. We expect to continue to expand our worldwide direct sales organization, build and expand applications centers, hire additional personnel involved in marketing in our existing and new geographic locations, increase the number of units for demonstration purposes and otherwise increase expenditures on sales and marketing activities in order to support the growth in our net sales. As such, we expect that our sales and marketing expenses will increase in the aggregate.

Research and development expense. We plan to continue to invest in research and development to improve our existing components and products and develop new components, products and systems. The amount of research and development expense we incur may vary from period to period. In general, if net sales continue to increase we expect research and development expense to increase in the aggregate.

General and administrative expense. We expect our general and administrative expenses to increase as we continue to invest in systems and resources to support our worldwide operations. Legal expenses vary from quarter to quarter based primarily upon the level of litigation and transaction activities.

Major customers. While we have historically depended on a few customers for a large percentage of our annual net sales, the composition of this group can change from year to year. Net sales derived from our five largest customers as a percentage of our net sales were 23% for the nine months ended September 30, 2013 and 16%, 17% and 19% for the full years 2012, 2011 and 2010, respectively. We seek to add new customers and to expand our relationships with existing customers. We anticipate that the composition of our significant customers will continue to change. If any of our significant customers were to substantially reduce their purchases from us, our results would be adversely affected.

Results of Operations for the three months ended September 30, 2013 compared to the three months ended September 30, 2012

Net sales. Net sales increased by $15.8 million, or 10.1%, to $172.2 million for the three months ended September 30, 2013 from $156.4 million for the three months ended September 30, 2012.

	Three Months Ended September 30,
	2013				2012				Change
			% of Total				% of Total
Materials processing	$	164,101	95.3	%	$	137,725	88.1	%	$	26,376		19.2	%
Other applications	8,051		4.7	%	18,654		11.9	%	(10,603		)	(56.8	)%
Total	$	172,152	100.0	%	$	156,379	100.0	%	$	15,773		10.1	%

Sales for materials processing applications increased primarily due to higher sales of high-power, medium-power and QCW lasers used in cutting and welding applications, offset by decreased sales of pulsed lasers used in marking and engraving applications. We continue to see increased acceptance of the advantages of fiber laser technology. A growing number of OEM customers have developed cutting systems that use our high-power lasers and sales of these systems are gaining sales from gas laser systems. In addition, new welding processes using fiber lasers have been developed, increasing sales of lasers for this application, which are replacing traditional laser and non-laser welding technologies. Among other factors contributing to sales

14

growth, QCW lasers are displacing lamp pumped YAG lasers with our OEM customers. Lower pulsed laser sales were attributable to high consumer electronics demand a year ago and increased competition for certain models of pulsed lasers. The decrease in other applications sales relates primarily to a decrease in sales of lasers for advanced applications in the current year following fulfillment of a large order a year ago and lower telecommunications sales in Russia and North America. Orders for certain advanced applications can be uneven and of high unit value so that they can both benefit and impact sales depending on their timing.

Cost of sales and gross margin. Cost of sales increased by $8.9 million, or 12.7%, to $79.3 million for the three months ended September 30, 2013 from $70.4 million for the three months ended September 30, 2012. Our gross margin decreased to 53.9% for the three months ended September 30, 2013 from 55.0% for the three months ended September 30, 2012. Gross margin decreased due to geographical mix of sales and an increase in sales volume to OEM customers which earn volume sales discounts. Product mix reduced gross margin due to lower sales of high brightness lasers in the quarter. High brightness lasers have a higher average selling price per watt than other products.

Sales and marketing expense. Sales and marketing expense increased by $1.0 million, or 17.6%, to $6.8 million for the three months ended September 30, 2013 from $5.8 million for the three months ended September 30, 2012, primarily as a result of increases in personnel costs and trade shows to support the increase in revenue. As a percentage of sales, sales and marketing expense increased to 4.0% for the three months ended September 30, 2013 from 3.7% for the three months ended September 30, 2012.

Research and development expense. Research and development expense increased by $3.7 million, or 48.2%, to $11.5 million for the three months ended September 30, 2013, compared to $7.8 million for the three months ended September 30, 2012, primarily as a result of increases in personnel costs and costs of material used for research and development. Of the total increase in research and development expense, $1.8 million is associated with the ongoing research and development costs of acquisitions made in the third quarter of 2012 and first quarter of 2013. Research and development continues to focus on developing new products at different wavelengths including ultra-violet ("UV"), green and mid-infrared, new pulsed products, enhancing the performance of our internally manufactured components, refining production processes to improve manufacturing yields, developing new accessories and achieving higher output powers. As a percentage of sales, research and development expense increased to 6.7% for the three months ended September 30, 2013 from 5.0% for the three months ended September 30, 2012.

General and administrative expense. General and administrative expense increased by $2.6 million, or 24.2%, to $13.2 million for the three months ended September 30, 2013 from $10.6 million for the three months ended September 30, 2012, primarily as a result of increased personnel costs, consulting costs, depreciation and premises costs and increased reserves for bad debt. Of the total increase in general and administrative expense, $0.8 million is associated with the ongoing general and administrative costs of acquisitions made in the third quarter of 2012 and first quarter of 2013. As a percentage of sales, general and administrative expense increased to 7.7% for the three months ended September 30, 2013 from 6.8% for the three months ended September 30, 2012.

Effect of exchange rates on net sales, gross profit and operating expenses. We estimate that, if exchange rates had been the same as one year ago, net sales for the three months ended September 30, 2013 would have been approximately the same, gross profit would have been approximately the same and total operating expenses would have been $0.1 million lower.

Loss (gain) on foreign exchange. We incurred a foreign exchange loss of $1.6 million for the three months ended September 30, 2013 as compared to $1.8 millionloss for the three months ended September 30, 2012. The change is primarily attributable to the changes of the U.S. Dollar against the Euro, Russian Ruble, Korean Won and Chinese Yuan.

Interest income (expense), net. Interest income (expense), net remained consistent at $0.1 million of income for the three months ended September 30, 2013 and for the three months ended September 30, 2012.

Other income (expense), net. Other income (expense), net remained consistent at $0.2 million of income for the three months ended September 30, 2013 and for the three months ended September 30, 2012.

Provision for income taxes. Provision for income taxes was $17.7 million for the three months ended September 30, 2013 compared to $17.8 million for the three months ended September 30, 2012. The effective tax rates were 29.5% and 29.6% for the three months ended September 30, 2013 and 2012, respectively.

Net income attributable to IPG Photonics Corporation. Net income attributable to IPG Photonics Corporation decreased by $0.1 million to $42.3 million for the three months ended September 30, 2013 compared to $42.4 million for the three months ended September 30, 2012. Net income attributable to IPG Photonics Corporation as a percentage of our net sales

15

decreased by 2.5 percentage points to 24.6% for the three months ended September 30, 2013 from 27.1% for the three months ended September 30, 2012 due to the factors described above.

Results of Operations for the nine months ended September 30, 2013 compared to the six months ended September 30, 2012

Net sales. Net sales increased by $64.7 million, or 15.5%, to $482.2 million for the nine months ended September 30, 2013 from $417.5 million for the nine months ended September 30, 2012.

	Nine Months Ended September 30,
	2013				2012				Change
			% of Total				% of Total
Materials processing	$	453,199	94.0	%	$	365,525	87.6	%	$	87,674		24.0	%
Other applications	28,977		6.0	%	51,973		12.4	%	(22,996		)	(44.2	)%
Total	$	482,176	100.0	%	$	417,498	100.0	%	$	64,678		15.5	%

Sales for materials processing applications increased primarily due to higher sales of high-power, medium-power and QCW lasers used in cutting and welding applications, offset by decreased sales of pulsed lasers used in marking and engraving applications. We continue to see increased acceptance of the advantages of fiber laser technology. A growing number of OEM customers have developed cutting systems that use our high-power lasers and sales of these systems are gaining sales from gas laser systems. In addition, new welding processes using fiber lasers have been developed, increasing sales of lasers for this application, which are replacing traditional laser and non-laser welding technologies. We also increased sales of QCW lasers used for cutting and welding thin sheet metal because of higher demand in consumer electronics applications and from increased OEM demand driven in part by the displacement of lamp pumped YAG lasers. Lower pulsed laser sales were attributable to high consumer electronics demand a year ago and increased competition for certain models of pulsed lasers. The decrease in other applications sales relates primarily to a decrease in sales of lasers for advanced applications in the current year following fulfillment of large orders a year ago and lower telecommunications sales in Russia and North America. Orders for certain advanced applications can be uneven and of high unit value so that they can both benefit and impact sales depending on their timing.

Cost of sales and gross margin. Cost of sales increased by $35.9 million, or 19.1%, to $223.8 million for the nine months ended September 30, 2013 from $187.9 million for the nine months ended September 30, 2012. Our gross margin decreased to 53.6% from 55.0% for the nine months ended September 30, 2013 and 2012, respectively. Gross margin decreased due to product and geographical mix of sales and an increase in sales volume to OEM customers which earn volume sales discounts. Product mix reduced gross margin due to lower sales of high brightness lasers in the nine months ended September 30, 2013. High brightness lasers have a higher average selling price per watt than other products.

Sales and marketing expense. Sales and marketing expense increased by $2.7 million, or 16.4%, to $19.5 million for the nine months ended September 30, 2013 from $16.8 million for the nine months ended September 30, 2012, primarily as a result of an increase in personnel costs, advertising and trade shows to support the increase in revenue. As a percentage of sales, sales and marketing expense remained relatively flat at 4.0% for the nine months ended September 30, 2013 and for the nine months ended September 30, 2012.

Research and development expense. Research and development expense increased by $8.7 million, or 39.1%, to $30.8 million for the nine months ended September 30, 2013, compared to $22.1 million for the nine months ended September 30, 2012, primarily as a result of increases in personnel costs and costs of material used for research and development. Included in the increase are $3.5 million of research and development costs associated with the ongoing research and development costs of companies which were acquired in the third quarter of 2012 and first quarter of 2013. Research and development continues to focus on developing new products at different wavelengths including UV, green and mid-infrared, new pulsed products, improving the electrical efficiency of high power products, enhancing the performance of our internally manufactured components, refining production processes to improve manufacturing yields, developing new accessories and achieving higher output powers. As a percentage of sales, research and development expense increased to 6.4% for the nine months ended September 30, 2013 from 5.3% for the nine months ended September 30, 2012.

General and administrative expense. General and administrative expense increased by $8.5 million, or 29.1%, to $37.8 million for the nine months ended September 30, 2013 from $29.3 million for the nine months ended September 30, 2012, primarily due to increased personnel costs, accounting and legal, travel and premises expenses. General and administrative costs increased $2.4 million due to the additions of general and administrative costs for companies acquired in the third quarter of 2012 and the first quarter of 2013. As a percentage of sales, general and administrative expense increased to 7.8% for the nine months ended September 30, 2013 from 7.0% for the nine months ended September 30, 2012.

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Effect of exchange rates on net sales, gross profit and operating expenses. We estimate that, if exchange rates had been the same as one year ago, net sales for the nine months ended September 30, 2013 would have been $1.7 million higher, gross profit would have been $0.9 million higher and total operating expenses would have been $0.2 million higher.

Loss (gain) on foreign exchange. We incurred a foreign exchange loss of $1.0 million for the nine months ended September 30, 2013 as compared to $0.3 million gain for the nine months ended September 30, 2012. The change is primarily attributable to the changes of the U.S. Dollar against the Euro, Russian Ruble, Chinese Yuan and Korean Won.

Interest income (expense), net. Interest income (expense), net decreased to $0.1 million of expense for the nine months ended September 30, 2013 compared to $0.5 million of income for the nine months ended September 30, 2012. The decrease is the result of lower interest bearing deposits as compared to the prior period.

Other income (expense), net. Other income (expense), net increased to $0.1 million of income for the nine months ended September 30, 2013 compared to $1.0 million of expense for the nine months ended September 30, 2012. Included in other income (expense), net for the nine months ended September 30, 2013 were $2.9 million goodwill impairment charge partially offset by a $2.7 million reduction in contingent consideration related to prior year acquisitions. For the nine months ended September 30, 2012, $1.1 million of expense is included related to final payments on a contingent consideration agreement from a prior acquisition.

Provision for income taxes. Provision for income taxes was $50.1 million for the nine months ended September 30, 2013 compared to $48.4 million for the nine months ended September 30, 2012, representing an effective tax rate of 29.6% and 30.0% for the nine months ended September 30, 2013 and 2012, respectively. The increase in the provision for income taxes was primarily the result of increased income before provision for income taxes. The decrease in effective rate was due primarily to the mix of income earned in various tax jurisdictions as well as the benefit of 2012 research and development credits included in the American Taxpayer Relief Act of 2012 (the “Act”) which was signed into law on January 2, 2013. Because a change in tax law is accounted for in the period of enactment, certain provisions of the Act benefiting our 2012 U.S. federal taxes, including the research and experimentation credit, could not be recognized in our 2012 financial results and instead were reflected in our first quarter 2013 financial results.

Net income attributable to IPG Photonics Corporation. Net income attributable to IPG Photonics Corporation increased by $9.1 million to $119.2 million, or 8.3% for the nine months ended September 30, 2013 compared to $110.1 million for the nine months ended September 30, 2012. Net income attributable to IPG Photonics Corporation as a percentage of our net sales decreased by 1.7 percentage point to 24.7% for the nine months ended September 30, 2013 from 26.4% for the nine months ended September 30, 2012 due to the factors described above.

Liquidity and Capital Resources

Our principal sources of liquidity as of September 30, 2013 consisted of cash and cash equivalents of $398.4 million, unused credit lines and overdraft facilities of $63.1 million and working capital (excluding cash and cash equivalents) of $245.0 million. This compares to cash and cash equivalents of $384.1 million, unused credit lines and overdraft facilities of $61.4 million and working capital (excluding cash and cash equivalents) of $155.5 million as of December 31, 2012. The increase in cash and cash equivalents of $14.3 million from December 31, 2012 relates primarily to cash provided by operating activities in the nine months ended September 30, 2013 of $61.0 million. Cash provided by financing activities of $3.4 million was partially offset by cash used in investing activities of $53.2 million which mostly relate to investments in fixed assets and an acquisition during the first quarter.

Our long-term debt consists primarily of a $13.0 million secured variable-rate note, of which $1.3 million is the current portion. This debt matures in June 2015, at which time the outstanding debt balance would be $10.7 million. The variable interest rate was fixed by means of an interest rate swap instrument.

We believe that our existing cash and marketable securities, our cash flows from operations and our existing lines of credit provides us with the financial flexibility to meet our liquidity and capital needs, as well as to complete certain acquisitions of complementary businesses and technologies. Our future long-term capital requirements will depend on many factors including our level of sales, the impact of economic environment on our sales levels, the timing and extent of spending to support development efforts, the expansion of the global sales and marketing activities, the timing and introductions of new products, the need to ensure access to adequate manufacturing capacity and the continuing market acceptance of our products.

The following table details our line-of-credit facilities as of September 30, 2013:

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Description	Available Principal	Interest Rate	Maturity	Security
U.S. Revolving Line of Credit (1)	Up to $35.0 million	LIBOR plus 1.125% to 1.625%, depending on our performance	June 2015	Unsecured
Euro Credit Facility (Germany)(2)	Euro 20.0 million ($27.0 million)	Euribor + 1.25% or EONIA 1.75%	June 2014	Unsecured, guaranteed by parent company
Euro Overdraft Facilities	Euro 1.9 million ($2.6 million)	1.3%-6.5%	October 2014	Common pool of assets of German and Italian subsidiaries

(1) $14.1 million of this revolving credit facility is available to our foreign subsidiaries in their respective local currencies, including India, China, Japan and South Korea. There were no drawings at September 30, 2013.

(2) $17.6 million of this credit facility is available to our German subsidiary, $4.0 million is available to our Russian subsidiary and $5.4 million is available to our Italian subsidiary. Total drawings at September 30, 2013 was $1.5 million with an interest rate of 1.3%.

Our largest committed credit lines are with Bank of America and Deutsche Bank in the amounts of $35.0 million and $27.0 million, respectively, and neither of them is syndicated.

We are required to meet certain financial covenants associated with our U.S. revolving line of credit and long-term debt facilities. These covenants, tested quarterly, include a debt service coverage ratio and a funded debt to earnings before interest, taxes, depreciation and amortization (“EBITDA”) ratio. The debt service coverage covenant requires that we maintain a trailing twelve month ratio of cash flow to debt service that is greater than 1.5:1. Debt service is defined as required principal and interest payments during the period. Cash flow is defined as EBITDA less unfunded capital expenditures. The funded debt to EBITDA covenant requires that the sum of all indebtedness for borrowed money on a consolidated basis shall be less than two times our trailing twelve months EBITDA. We were in compliance with all such financial covenants as of and for the three months ended September 30, 2013.

The financial covenants in our loan documents may cause us to not take or to delay investments and actions that we might otherwise undertake because of limits on capital expenditures and amounts that we can borrow or lease. In the event that we do not comply with any one of these covenants, we would be in default under the loan agreement or loan agreements, which may result in acceleration of the debt, cross-defaults on other debt or a reduction in available liquidity, any of which could harm our results of operations and financial condition.

Operating activities. Net cash provided by operating activities decreased by $55.5 million to $61.0 million for the nine months ended September 30, 2013 from $116.5 million for the nine months ended September 30, 2012, primarily resulting from:

• A decrease in income and other taxes payable of $25.2 million in the nine months ended September 30, 2013 compared to an increase of $19.0 million in the nine months ended September 30, 2012, which includes cash payments for corporation tax in Germany of approximately $32 million for a final payment of fiscal year 2011 and revised estimated payment for fiscal year 2012 which both became due when we filed our fiscal year 2011 German tax return;

• An increase in inventory of $43.7 million in the nine months ended September 30, 2013 compared to an increase of $17.1 million in the nine months ended September 30, 2012; offset by

• An increase in accounts receivable of $26.9 million in the nine months ended September 30, 2013 compared to an increase of $36.5 million in the nine months ended September 30, 2012;

• An increase in cash provided by net income after adding back non-cash charges of $163.2 million in the nine months ended September 30, 2013 as compared to $157.3 million in the same period in 2012.

Given our vertical integration, rigorous and time-consuming testing procedures for both internally manufactured and externally purchased components and the lead time required to manufacture components used in our finished products, the rate at which we turn inventory has historically been comparatively low when compared to our cost of sales. Also, our historic growth rates required investment in inventories to support future sales and enable us to quote short delivery times to our customers, providing what we believe is a competitive advantage. Furthermore, if there was a disruption to the manufacturing capacity of any of our key technologies, our inventories of components should enable us to continue to build finished products for a reasonable period of time. We believe that we will continue to maintain a relatively high level of inventory compared to

18

our cost of sales. As a result, we expect to have a significant amount of working capital invested in inventory. A reduction in our level of net sales or the rate of growth of our net sales from their current levels would mean that the rate at which we are able to convert our inventory into cash would decrease.

Investing activities. Net cash used in investing activities was $53.2 million and $38.2 million in the nine months ended September 30, 2013 and 2012, respectively. The cash used in investing activities in 2013 related to the construction of new buildings in the United States, Germany and Russia as well as purchases of machinery and equipment and an acquisition during the first quarter of 2013. The cash used in investing activities in 2012 related to the construction of new buildings in the United States, Germany and Russia. These expenditures were partially offset by the proceeds from the maturity of short-term investments of $25.5 million.

We expect to incur approximately $65 million to $70 million in capital expenditures, excluding acquisitions in 2013, as we continue to upgrade facilities and add capacity world wide to support our anticipated revenue growth. The timing and extent of any capital expenditures in and between periods can have a significant effect on our cash flow. Many of the capital expenditure projects that we undertake have long lead times and are difficult to cancel or defer to a later period.

Financing activities. Net cash provided by financing activities was $3.4 million and $116.2 million in the nine months ended September 30, 2013 and 2012, respectively. The cash provided by financing activities in 2013 was primarily related to the cash provided by the exercise of stock options, issuances under our employee stock purchase plan and the related tax benefits of the exercises partially offset by the payments on our long-term debt and line-of-credit facilities. The cash provided by financing activities in 2012 was primarily related to the follow-on public stock offering for which we received $168.0 million, net of offering expenses partially offset by the repurchased 22.5% redeemable noncontrolling interest in our Russian subsidiary of $55.4 million.

Cautionary Statement Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934, and we intend that such forward-looking statements be subject to the safe harbors created thereby. For this purpose, any statements contained in this Quarterly Report on Form 10-Q except for historical information are forward-looking statements. Without limiting the generality of the foregoing, words such as “may,” “will,” “expect,” “believe,” “anticipate,” “intend,” “could,” “estimate,” or “continue” or the negative or other variations thereof or comparable terminology are intended to identify forward-looking statements. In addition, any statements that refer to projections of our future financial performance, trends in our businesses, or other characterizations of future events or circumstances are forward-looking statements.

The forward-looking statements included herein are based on current expectations of our management based on available information and involve a number of risks and uncertainties, all of which are difficult or impossible to accurately predict and many of which are beyond our control. As such, our actual results may differ significantly from those expressed in any forward-looking statements. Factors that may cause or contribute to such differences include, but are not limited to, those discussed in more detail in Item 1, “Business” and Item 1A, “Risk Factors” of Part I of our Annual Report on Form 10-K for the year ended December 31, 2012. Readers should carefully review these risks, as well as the additional risks described in other documents we file from time to time with the Securities and Exchange Commission. In light of the significant risks and uncertainties inherent in the forward-looking information included herein, the inclusion of such information should not be regarded as a representation by us or any other person that such results will be achieved, and readers are cautioned not to rely on such forward-looking information. We undertake no obligation to revise the forward-looking statements contained herein to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.

Recent Accounting Pronouncements

Accounting standards that have been issued or proposed by the FASB or other standards-setting bodies that do not require

adoption until a future date are not expected to have a material impact on our financial statements upon adoption.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We are exposed to market risk in the ordinary course of business, which consists primarily of interest rate risk associated with our cash and cash equivalents and our debt and foreign exchange rate risk.

Interest rate risk. Our investments have limited exposure to market risk. To minimize this risk, we maintain a portfolio of cash, cash equivalents and short-term investments, consisting primarily of bank deposits, money market funds and short-term government securities. The interest rates are variable and fluctuate with current market conditions. Because of the short-term nature of these instruments, a sudden change in market interest rates would not be expected to have a material impact on our financial condition or results of operations.

19

We are also exposed to market risk as a result of increases or decreases in the amount of interest expense we must pay on our bank debt and borrowings on our bank credit facilities. Our interest obligations on our long-term debt are fixed by means of interest rate swap agreements. Although our U.S. revolving line of credit and our Euro credit facility have variable rates, we do not believe that a 10% change in market interest rates would have a material impact on our financial position or results of operations.

Exchange rates. Due to our international operations, a significant portion of our net sales, cost of sales and operating expenses are denominated in currencies other than the U.S. Dollar, principally the Euro, the Japanese Yen, the Russian Ruble, and Chinese Yuan. As a result, our international operations give rise to transactional market risk associated with exchange rate movements of the U.S. Dollar, the Euro, the Japanese Yen, the Russian Ruble, and Chinese Yuan. Loss on foreign exchange transactions totaled $1.6 million for the three months ended September 30, 2013. Loss on foreign exchange transactions totaled $1.8 million for the three months ended September 30, 2012. Management attempts to hedge these exposures by partially or fully off-setting foreign currency denominated assets and liabilities at our subsidiaries that operate in different functional currencies. Foreign currency derivative instruments can also be used to hedge exposures and reduce the risks of certain foreign currency transactions; however, these instruments provide only limited protection and can carry significant cost. We have no foreign currency hedges as of September 30, 2013. We will continue to analyze our exposure to currency exchange rate fluctuations and may engage in financial hedging techniques in the future to attempt to minimize the effect of these potential fluctuations. Exchange rate fluctuations may adversely affect our financial results in the future.

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Under the supervision of our chief executive officer and our chief financial officer, our management has evaluated the effectiveness of the design and operation of our “disclosure controls and procedures” (as defined in Rules 13a-15(e) and 15d-15(e) promulgated under the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), as of the end of the period covered by this Quarterly Report on Form 10-Q (the “Evaluation Date”). Based upon that evaluation, our chief executive officer and our chief financial officer have concluded that, as of the Evaluation Date, our disclosure controls and procedures are effective.

Changes in Internal Controls

There was no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) promulgated under the Exchange Act) that occurred during the last fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

20

PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time, we are party to various legal proceedings and other disputes incidental to our business. There have been no material developments to those proceedings reported in our Annual Report on Form 10-K for the year ended December 31, 2012, and our Quarterly Report on Form 10-Q for the quarter ended June 30, 2013.

ITEM  1A. RISK FACTORS

In addition to the other information set forth in this report, you should carefully consider the factors discussed in Part I, “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2012, and our Quarterly Report on Form 10-Q for the quarter ended June 30, 2013, which could materially affect our business, financial condition or future results. The risks described in our Annual Report on Form 10-K and Quarterly Reports on Form 10-Q are not the only risks facing our Company. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially adversely affect our business, financial condition and/or operating results.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

Issuer Purchases of Equity Securities

Date	Total Number of Shares (or Units) Purchased			Average Price Paid per Share (or Unit)		Total Number of Shares (or Units) Purchased as Part of Publicly Announced Plans or Programs		Maximum Number (or Approximate Dollar Value) of Shares (or Units) that May Yet Be Purchased Under the Plans or Programs
March 1, 2013 — March 31, 2013	48	(1	)	$	60.11	$	—	$	—
April 1, 2013 — April 30, 2013	55	(1	)	66.41		—		—
June 1, 2013 — June 30, 2013	89	(1	)	59.30		—		—
July 1, 2013 — July 31, 2013	55	(1	)	60.73		—		—
August 1, 2013 — August 31, 2013	—	(1	)	—		—		—
September 1, 2013 — September 30, 2013	75	(1	)	53.76		—		—
Total	322			$	59.59	$	—	$	—

(1) Our Board of Directors approved “withhold to cover” as a tax payment method for vesting of restricted stock awards for certain employees. Pursuant to the “withhold to cover” method, we withheld from such employees the shares noted in the table above to cover tax withholding related to the vesting of their awards. The average prices listed in the above table are averages of the fair market prices at which we valued shares withheld for purposes of calculating the number of shares to be withheld.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

(a) Exhibits

21

Exhibit No.	Description
12.1	Statement Re Computation of Earnings to Fixed Charges
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)
32	Certification of Chief Executive Officer and Chief Financial Officer pursuant to Section 1350
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation Linkbase
101.LAB	XBRL Taxonomy Extension Label Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase
101.DEF	XBRL Taxonomy Extension Definition Linkbase

22

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this Report to be signed on its behalf by the undersigned thereunto duly authorized.

	IPG PHOTONICS CORPORATION
Date: November 8, 2013	By:	/s/ Valentin P. Gapontsev
		Valentin P. Gapontsev
		Chairman and Chief Executive Officer (Principal Executive Officer)
Date: November 8, 2013	By:	/s/ Timothy P.V. Mammen
		Timothy P.V. Mammen Senior Vice President and Chief Financial Officer (Principal Financial Officer)

23

EX-12.1

Exhibit 12.1

STATEMENT RE COMPUTATION OF EARNINGS TO FIXED CHARGES

	Nine Months Ended September 30,		Year Ended December 31,
(In thousands, except ratios)	2013		2012		2011		2010		2009		2008
Ratio of Earnings to Fixed Charges
Earnings:
Income before income taxes	$	169,318	$	209,215	$	174,584	$	79,252	$	7,769	$	56,564
Add:
Amortization of capitalized interest	56		43		38		36		35		32
Fixed charges, net of capitalized interest	376		1,179		1,403		1,749		1,966		2,151
Income before income taxes and fixed charges, net	$	169,750	$	210,437	$	176,025	$	81,037	$	9,770	$	58,747
Fixed Charges:
Total interest expense	$	213	$	946	$	1,141	$	1,508	$	1,695	$	1,669
Capitalized interest	387		142		46		18		75		390
Interest factor in rents	163		233		262		241		271		482
Total fixed charges	$	763	$	1,321	$	1,449	$	1,767	$	2,041	$	2,541
Ratio of earnings to fixed charges	222.5x		159.3x		121.5x		45.9x		4.8x		23.1x

EX-31.1

Exhibit 31.1

Certification of Chief Executive Officer

Pursuant to Rule 13a – 14(a) or Rule 15d – 14(a) of the Securities Exchange Act of 1934

I, Valentin P. Gapontsev, certify that:

1. I have reviewed this quarterly report on Form 10-Q of IPG Photonics Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 8, 2013

By:	/s/ Valentin P. Gapontsev
	Valentin P. Gapontsev
	Chairman and Chief Executive Officer (Principal Executive Officer)

EX-31.2

Exhibit 31.2

Certification of Chief Financial Officer

Pursuant to Rule 13a – 14(a) or Rule 15d – 14(a) of the Securities Exchange Act of 1934

I, Timothy P.V. Mammen, certify that:

1. I have reviewed this quarterly report on Form 10-Q of IPG Photonics Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 8, 2013

By:	/s/ Timothy P.V. Mammen
	Timothy P.V. Mammen
	Vice President and Chief Financial Officer (Principal Financial Officer)

EX-32

Exhibit 32

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the filing of the Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2013 (the “Report”) by IPG Photonics Corporation (the “Company”), Valentin P. Gapontsev, as the Chief Executive Officer of the Company, and Timothy P.V. Mammen, as the Chief Financial Officer of the Company, each hereby certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to the best of his knowledge:

1 the Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

2 the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 8, 2013

/s/ Valentin P. Gapontsev

Valentin P. Gapontsev

Chairman and Chief Executive Officer

/s/ Timothy P.V. Mammen

Timothy P.V. Mammen

Vice President and Chief Financial Officer

A signed original of this written statement required by 18 U.S.C. Section 1350 has been provided to IPG Photonics Corporation and will be retained by IPG Photonics Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Product Warranties

9 Months Ended

Sep. 30, 2013

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 nine months ended September 30, 2013 and 2012.

	2013			2012
Balance at January 1	$	10,714		$	8,631
Provision for warranty accrual	7,867			6,548
Warranty claims and other reductions	(4,977		)	(4,775		)
Foreign currency translation	136			(14		)
Balance at September 30	$	13,740		$	10,390

Accrued warranty reported in the accompanying consolidated financial statements as of September 30, 2013 and December 31, 2012 consist of $7,697 and $7,838 in accrued expenses and other liabilities and $6,043 and $2,876 in other long-term liabilities, respectively.

XML

Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
NET SALES	$ 172,152	$ 156,379	$ 482,175	$ 417,498
COST OF SALES	79,339	70,420	223,799	187,945
GROSS PROFIT	92,813	85,959	258,376	229,553
OPERATING EXPENSES:
Sales and marketing	6,801	5,785	19,514	16,771
Research and development	11,501	7,762	30,782	22,131
General and administrative	13,175	10,609	37,814	29,294
Loss (gain) on foreign exchange	1,563	1,796	972	(272)
Total operating expenses	33,040	25,952	89,082	67,924
OPERATING INCOME	59,773	60,007	169,294	161,629
OTHER INCOME (EXPENSE), Net:
Interest income (expense), net	63	55	(25)	541
Other income (expense), net	218	205	49	(981)
Total other income (expense)	281	260	24	(440)
INCOME BEFORE PROVISION FOR INCOME TAXES	60,054	60,267	169,318	161,189
PROVISION FOR INCOME TAXES	(17,716)	(17,832)	(50,133)	(48,357)
NET INCOME	42,338	42,435	119,185	112,832
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	0	0	0	2,740
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION	$ 42,338	$ 42,435	$ 119,185	$ 110,092
NET INCOME ATTRIBUTABLE TO IPG PHOTONICS CORPORATION PER SHARE:
Basic (in dollars per share)	$ 0.82	$ 0.83	$ 2.32	$ 2.20
Diluted (in dollars per share)	$ 0.81	$ 0.81	$ 2.28	$ 2.16
WEIGHTED AVERAGE SHARES OUTSTANDING:
Basic (shares)	51,495	51,090	51,474	50,204
Diluted (shares)	52,367	52,102	52,346	51,281

XML

Inventories

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Inventories

INVENTORIES

Inventories consist of the following:

	September 30,		December 31,
	2013		2012
Components and raw materials	$	56,738	$	53,436
Work-in-process	60,391		46,240
Finished goods	54,139		39,942
Total	$	171,268	$	139,618

The Company recorded inventory provisions totaling $4,286 and $2,486 for the three months ended September 30, 2013 and 2012, respectively, and $7,842 and $6,129 for the nine months ended September 30, 2013 and 2012, 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 goods.

XML

Derivative Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair Value Of Cash Flow Hedges

The fair value amounts in the consolidated balance sheet were:

	Notional Amounts1				Other Assets				Other Long-Term Liabilities
	September 30,		December 31,		September 30,		December 31,		September 30,		December 31,
	2013		2012		2013		2012		2013		2012
Interest rate swap	$	13,000	$	14,000	$	—	$	—	$	493	$	855
Total	$	13,000	$	14,000	$	—	$	—	$	493	$	855

(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 (losses) in the consolidated statements of income related to the Company’s interest rate swap contracts were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Effective portion recognized in other comprehensive gain (loss), pretax:
Interest rate swap	$	186		$	219		$	733		$	667
Effective portion reclassified from other comprehensive gain (loss) to interest expense, pretax:
Interest rate swap	$	(101	)	$	(140	)	$	(371	)	$	(436	)
Ineffective portion recognized in income:
Interest rate swap	$	—		$	—		$	—		$	—

XML

Income Taxes

9 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

A reconciliation of the total amounts of unrecognized tax benefits is as follows:

	2013			2012
Balance at January 1	$	5,392		$	4,509
Reductions of prior period positions	(63		)	—
Additions for tax positions in prior period	—			—
Additions for tax positions in current period	293			556
Balance at September 30	$	5,622		$	5,065

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.

XML

Goodwill And Intangibles (Changes In The Carrying Amount Of Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Goodwill [Roll Forward]
Balance at January 1	$ 2,898
Adjustment	(95)
Impairment	(2,803)
Total goodwill arising from acquisition	455
Balance at September 30	$ 455

XML

Product Warranties (Tables)

9 Months Ended

Sep. 30, 2013

Product Warranties Disclosures [Abstract]

Summary Of Product Warranty Activity

The following table summarizes product warranty activity recorded during the nine months ended September 30, 2013 and 2012.

	2013			2012
Balance at January 1	$	10,714		$	8,631
Provision for warranty accrual	7,867			6,548
Warranty claims and other reductions	(4,977		)	(4,775		)
Foreign currency translation	136			(14		)
Balance at September 30	$	13,740		$	10,390

XML

Goodwill And Intangibles (Tables)

9 Months Ended

Sep. 30, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Changes In The Carrying Amount Of Goodwill

The following table sets forth the changes in the carrying amount of goodwill for the nine months ended September 30, 2013:

	Amounts
Balance at January 1	$	2,898
Adjustment	(95		)
Impairment	(2,803		)
Total goodwill arising from acquisition	455
Balance at September 30	$	455

Intangible Assets

Intangible assets, subject to amortization, consisted of the following:

	September 30, 2013								December 31, 2012
	Gross  Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted- Average  Lives	Gross  Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted- Average  Lives
Patents	$	4,667	$	(4,066	)	$	601	6 Years	$	4,664	$	(4,193	)	$	471	6 Years
Customer relationships	4,054		(3,101		)	953		5 Years	3,993		(2,363		)	1,630		5 Years
Production know-how	7,029		(1,494		)	5,535		8 Years	2,514		(656		)	1,858		9 Years
Technology, trademark and tradename	4,249		(1,207		)	3,042		8 Years	4,229		(678		)	3,551		8 Years
	$	19,999	$	(9,868	)	$	10,131		$	15,400	$	(7,890	)	$	7,510

Estimated Future Amortization Expense For Intangibles

The estimated future amortization expense for intangibles for the remainder of 2013 and subsequent years is as follows:

2013	2014	2015	2016	2017	Thereafter	Total
$596	$2,047	$1,637	$1,451	$1,451	$2,949	$10,131

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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, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Interest rate swap
Derivative Instruments, Gain (Loss) [Line Items]
Effective portion recognized in other comprehensive gain (loss), pretax:	$ 186	$ 219	$ 733	$ 667
Effective portion reclassified from other comprehensive gain (loss) to interest expense, pretax:	(101)	(140)	(371)	(436)
Ineffective portion recognized in income:	$ 0	$ 0	$ 0	$ 0

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Goodwill And Intangibles (Estimated Future Amortization Expense For Intangibles) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Goodwill and Intangible Assets Disclosure [Abstract]
2013	$ 596
2014	2,047
2015	1,637
2016	1,451
2017	1,451
Thereafter	2,949
Net Carrying Amount	$ 10,131	$ 7,510

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Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	$ 1,547	$ 2,442
Less: current portion	(1,333)	(1,505)
Total long-term debt	11,667	14,014
European overdraft facilities
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	820	1,135
Euro line of credit
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	727	956
U.S. line of credit
Debt Instrument [Line Items]
Revolving line-of-credit facilities:	0	351
U.S. long-term note
Debt Instrument [Line Items]
Term debt:	13,000	14,000
Other notes payable
Debt Instrument [Line Items]
Term debt:	$ 0	$ 1,519

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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 5,392	$ 4,509
Reductions of prior period positions	(63)	0
Additions for tax positions in prior period	0	0
Additions for tax positions in current period	293	556
Balance at September 30	$ 5,622	$ 5,065

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Assets And Liabilities Measured At Fair Value

The following table presents information about the Company’s cash equivalents and assets and liabilities measured at fair value:

			Fair Value Measurements at September 30, 2013
	Total		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	219,248	$	219,248	$	—	$	—
Auction rate securities	1,118		—		—		1,118
Total assets	$	220,366	$	219,248	$	—	$	1,118
Liabilities
Contingent purchase consideration	$	375	$	—	$	—	$	375
Interest rate swaps	493		—		493		—
Total liabilities	$	868	$	—	$	493	$	375
			Fair Value Measurements at December 31, 2012
	Total		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	237,049	$	237,049	$	—	$	—
Auction rate securities	1,112		—		—		1,112
Total assets	$	238,161	$	237,049	$	—	$	1,112
Liabilities
Contingent purchase consideration	$	3,023	$	—	$	—	$	3,023
Interest rate swaps	855		—		855		—
Total liabilities	$	3,878	$	—	$	855	$	3,023

Fair Value Of Auction Rate Securities

	Three Months Ended September 30,					Nine Months Ended September 30,
	2013			2012		2013			2012
Auction Rate Securities
Balance, beginning of period	$	1,116		$	1,108	$	1,112		$	1,104
Period transactions	—			—		—			—
Change in fair value	2			2		6			6
Redeemed by issuers at par	—			—		—			—
Balance, end of period	$	1,118		$	1,110	$	1,118		$	1,110
Contingent Purchase Consideration
Balance, beginning of period	$	559		$	597	$	3,023		$	999
Period transactions	—			1,847		—			1,847
Adjustment for determination of final payment	—			—		—			987
Change in fair value	(184		)	—		(2,648		)	28
Reclass of determined final payment	—			—		—			(1,417		)
Balance, end of period	$	375		$	2,444	$	375		$	2,444
Warrant
Balance, beginning of period	$	—		$	—	$	—		$	77
Period transactions	—			—		—			(77		)
Change in fair value	—			—		—			—
Balance, end of period	$	—		$	—	$	—		$	—

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Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 119,185	$ 112,832
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	23,414	19,168
Deferred income taxes	(7,591)	2,705
Stock-based compensation	8,604	6,358
Gains on foreign currency transactions	972	1,484
Other	369	38
Provisions for inventory, warranty & bad debt	18,203	14,762
Changes in assets and liabilities that (used) provided cash:
Accounts receivable	(26,942)	(36,514)
Inventories	(43,705)	(17,050)
Prepaid expenses and other current assets	(3,478)	(3,335)
Accounts payable	(2,008)	2,170
Accrued expenses and other liabilities	2,734	(1,281)
Income and other taxes payable	(25,186)	19,038
Tax benefit from exercise of employee stock options	(3,610)	(3,870)
Net cash provided by operating activities	60,961	116,505
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property, plant and equipment	(48,333)	(51,715)
Proceeds from sales of property, plant and equipment	202	0
Proceeds from short-term investments	0	25,452
Acquisition of businesses	(5,555)	(11,596)
Other	442	(313)
Net cash used in investing activities	(53,244)	(38,172)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from line-of-credit facilities	14,124	9,647
Payments on line-of-credit facilities	(15,019)	(11,605)
Purchase of noncontrolling interests	0	(700)
Purchase of redeemable noncontrolling interests	0	(55,400)
Principal payments on long-term borrowings	(2,519)	(1,848)
Exercise of employee stock options and issuances under employee stock purchase plan	3,228	4,275
Tax benefit from exercise of employee stock options	3,610	3,870
Proceeds from follow-on public offering, net of offering expenses	0	167,963
Net cash provided by financing activities	3,424	116,202
EFFECT OF CHANGES IN EXCHANGE RATES ON CASH AND CASH EQUIVALENTS	3,161	(2,200)
NET INCREASE IN CASH AND CASH EQUIVALENTS	14,302	192,335
CASH AND CASH EQUIVALENTS — Beginning of period	384,053	180,234
CASH AND CASH EQUIVALENTS — End of period	398,355	372,569
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION:
Cash paid for interest	190	553
Cash paid for income taxes	74,107	20,967
Non-cash transactions:
Demonstration units transferred from inventory to other assets	3,185	2,098
Amounts related to acquisition of businesses included in accounts payable and accrued expenses and other long-term liabilities	0	2,444
Additions to property, plant and equipment included in accounts payable	$ 679	$ 545

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Basis Of Presentation

9 Months Ended

Sep. 30, 2013

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”, “we”, “our”, “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, 2012.

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.

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Accrued Expenses And Other Liabilities

9 Months Ended

Sep. 30, 2013

Payables and Accruals [Abstract]

Accrued Expenses And Other Liabilities

ACCRUED EXPENSES AND OTHER LIABLILITES

Accrued expenses and other liabilities consist of the following:

	September 30,		December 31,
	2013		2012
Accrued compensation	$	24,863	$	21,972
Customer deposits and deferred revenue	19,929		17,174
Current portion of accrued warranty	7,697		7,838
Other	7,064		4,467
Total	$	59,553	$	51,451

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Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2013

Accounting Changes and Error Corrections [Abstract]

Recent Accounting Pronouncements

RECENT ACCOUNTING PRONOUNCEMENTS

Accounting standards that have been issued or proposed by the FASB or other standards-setting bodies that do not require

adoption until a future date are not expected to have a material impact on the Company's financial statements upon adoption.

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Product Warranties (Narrative) (Details) (USD $) In Thousands, unless otherwise specified			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Minimum	Sep. 30, 2013 Maximum
Product Warranties [Line Items]
Service warranties on lasers and amplifiers			1 year	3 years
Accrued warranty reported in accrued expenses and other liabilities	$ 7,697	$ 7,838
Accrued warranty reported in other long-term liabilities	$ 6,043	$ 2,876

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2013

Income Tax Disclosure [Abstract]

Reconciliation Of The Total Amounts Of Unrecognized Tax Benefits

A reconciliation of the total amounts of unrecognized tax benefits is as follows:

	2013			2012
Balance at January 1	$	5,392		$	4,509
Reductions of prior period positions	(63		)	—
Additions for tax positions in prior period	—			—
Additions for tax positions in current period	293			556
Balance at September 30	$	5,622		$	5,065

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Net Income Attributable To IPG Photonics Corporation Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 29, 2012 Russian Subsidiary, Nto Ire Polus
Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Line Items]
Net income attributable to IPG Photonics Corporation	$ 42,338	$ 42,435	$ 119,185	$ 110,092
Adjustments to redemption value of redeemable NCI	0	0	0	493
Net income attributable to common stockholders	$ 42,338	$ 42,435	$ 119,185	$ 110,585
Weighted average shares (shares)	51,495	51,090	51,474	50,204
Dilutive effect of common stock equivalents (shares)	872	1,012	872	1,077
Diluted weighted average common shares (shares)	52,367	52,102	52,346	51,281
Basic net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 0.82	$ 0.83	$ 2.32	$ 2.19
Adjustments to redemption value of redeemable noncontrolling interests (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Basic net income attributable to common stockholders (in dollars per share)	$ 0.82	$ 0.83	$ 2.32	$ 2.20
Diluted net income attributable to IPG Photonics Corporation per share (in dollars per share)	$ 0.81	$ 0.81	$ 2.28	$ 2.15
Adjustments to redemption value of redeemable noncontrolling interests (in dollars per share)	$ 0.00	$ 0.00	$ 0.00	$ 0.01
Diluted net income attributable to common stockholders (in dollars per share)	$ 0.81	$ 0.81	$ 2.28	$ 2.16
Options excluded from computation of diluted weighted average common shares	31	75	210	9
Percentage of redeemable noncontrolling interests					22.50%

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Goodwill And Intangibles (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended			0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Mar. 13, 2013 Mobius Photonics	Sep. 30, 2013 IPG Microsystems
Business Acquisition [Line Items]
Acquired finite-lived intangible asset						$ 4,480,000
Total goodwill arising from acquisition			455,000			455,000
Amortization expense of intangibles	596,000	572,000	1,705,000	1,669,000
Adjusted value of goodwill	$ 455,000		$ 455,000		$ 2,898,000		$ 0

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Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2013	Dec. 31, 2012
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	51,604,568	51,359,247
Common stock, shares outstanding	51,604,568	51,359,247

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Derivative Financial Instruments

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Financial Instruments

DERIVATIVE FINANCIAL 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 used foreign currency forward contracts as cash flow hedges of forecasted intercompany settlements denominated in foreign currencies of major industrial countries. The Company has no outstanding foreign currency forward contracts. The Company has interest rate swaps that are classified as a cash flow hedge of its variable rate debt. The Company has no derivatives that are not accounted for as a hedging instrument.

Cash flow hedges– The Company’s cash flow hedges are interest rate swaps under which it pays fixed rates of interest. The fair value amounts in the consolidated balance sheet were:

	Notional Amounts1				Other Assets				Other Long-Term Liabilities
	September 30,		December 31,		September 30,		December 31,		September 30,		December 31,
	2013		2012		2013		2012		2013		2012
Interest rate swap	$	13,000	$	14,000	$	—	$	—	$	493	$	855
Total	$	13,000	$	14,000	$	—	$	—	$	493	$	855

(1) Notional amounts represent the gross contract/notional amount of the derivatives outstanding.

The derivative gains (losses) in the consolidated statements of income related to the Company’s interest rate swap contracts were as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2013			2012			2013			2012
Effective portion recognized in other comprehensive gain (loss), pretax:
Interest rate swap	$	186		$	219		$	733		$	667
Effective portion reclassified from other comprehensive gain (loss) to interest expense, pretax:
Interest rate swap	$	(101	)	$	(140	)	$	(371	)	$	(436	)
Ineffective portion recognized in income:
Interest rate swap	$	—		$	—		$	—		$	—

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Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income	$ 42,338	$ 42,435	$ 119,185	$ 112,832
Other comprehensive income (loss), net of tax:
Translation adjustments	11,892	10,479	(2,094)	3,676
Unrealized gain on derivatives	53	24	227	130
Total other comprehensive income (loss)	11,945	10,503	(1,867)	3,806
Comprehensive income	54,283	52,938	117,318	116,638
Comprehensive income attributable to noncontrolling interest & redeemable noncontrolling interest	0	0	0	1,908
Comprehensive income attributable to IPG Photonics Corporation	$ 54,283	$ 52,938	$ 117,318	$ 114,730

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
CURRENT ASSETS:
Cash and cash equivalents	$ 398,355	$ 384,053
Accounts receivable, net	120,640	96,630
Inventories	171,268	139,618
Prepaid income taxes and income taxes receivable	17,326	13,071
Prepaid expenses and other current assets	30,072	18,639
Deferred income taxes, net	11,547	12,948
Total current assets	749,208	664,959
DEFERRED INCOME TAXES, NET	6,100	2,107
GOODWILL	455	2,898
INTANGIBLE ASSETS, NET	10,131	7,510
PROPERTY, PLANT AND EQUIPMENT, NET	236,507	210,563
OTHER ASSETS	7,395	7,461
TOTAL	1,009,796	895,498
CURRENT LIABILITIES:
Revolving line-of-credit facilities	1,547	2,442
Current portion of long-term debt	1,333	1,505
Accounts payable	14,293	17,783
Accrued expenses and other liabilities	59,553	51,451
Deferred income taxes, net	2,050	9,831
Income taxes payable	27,031	42,443
Total current liabilities	105,807	125,455
DEFERRED INCOME TAXES AND OTHER LONG-TERM LIABILITIES	16,635	13,102
LONG-TERM DEBT, NET OF CURRENT PORTION	11,667	14,014
Total liabilities	134,109	152,571
COMMITMENTS AND CONTINGENCIES (NOTE 12)
IPG PHOTONICS CORPORATION STOCKHOLDERS’ EQUITY:
Common stock, $0.0001 par value, 175,000,000 shares authorized; 51,604,568 shares issued and outstanding at September 30, 2013; 51,359,247 shares issued and outstanding at December 31, 2012	5	5
Additional paid-in capital	526,481	511,039
Retained earnings	354,162	234,977
Accumulated other comprehensive loss	(4,961)	(3,094)
Total IPG Photonics Corporation stockholders’ equity	875,687	742,927
TOTAL	$ 1,009,796	$ 895,498

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Inventories (Components Of Inventories) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Inventory Disclosure [Abstract]
Components and raw materials	$ 56,738		$ 56,738		$ 53,436
Work-in-process	60,391		60,391		46,240
Finished goods	54,139		54,139		39,942
Total	171,268		171,268		139,618
Inventory provisions	$ 4,286	$ 2,486	$ 7,842	$ 6,129

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Net Income Attributable To IPG Photonics Corporation Per Share (Tables)

9 Months Ended

Sep. 30, 2013

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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Net income attributable to IPG Photonics Corporation	$	42,338	$	42,435	$	119,185	$	110,092
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		493
Net income attributable to common stockholders	42,338		42,435		119,185		110,585
Weighted average shares	51,495		51,090		51,474		50,204
Dilutive effect of common stock equivalents	872		1,012		872		1,077
Diluted weighted average common shares	52,367		52,102		52,346		51,281
Basic net income attributable to IPG Photonics Corporation per share	$	0.82	$	0.83	$	2.32	$	2.19
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		0.01
Basic net income attributable to common stockholders	$	0.82	$	0.83	$	2.32	$	2.20
Diluted net income attributable to IPG Photonics Corporation per share	$	0.81	$	0.81	$	2.28	$	2.15
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		0.01
Diluted net income attributable to common stockholders	$	0.81	$	0.81	$	2.28	$	2.16

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Commitments and Contingencies (Details) (Misappropriation of Trade Secrets, Unfair Trade Practices, and Correction of Inventorship on a Patent Owned, Pending Litigation, USD $)	9 Months Ended
	Sep. 30, 2013
Misappropriation of Trade Secrets, Unfair Trade Practices, and Correction of Inventorship on a Patent Owned | Pending Litigation
Loss Contingencies [Line Items]
Loss deemed probable	$ 0
Amount accrued in respect of contingency	$ 0

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Goodwill And Intangibles (Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 19,999	$ 15,400
Accumulated Amortization	(9,868)	(7,890)
Net Carrying Amount	10,131	7,510
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,667	4,664
Accumulated Amortization	(4,066)	(4,193)
Net Carrying Amount	601	471
Weighted- Average Lives	6 years	6 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,054	3,993
Accumulated Amortization	(3,101)	(2,363)
Net Carrying Amount	953	1,630
Weighted- Average Lives	5 years	5 years
Production know-how
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,029	2,514
Accumulated Amortization	(1,494)	(656)
Net Carrying Amount	5,535	1,858
Weighted- Average Lives	8 years	9 years
Technology, trademark and tradename
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	4,249	4,229
Accumulated Amortization	(1,207)	(678)
Net Carrying Amount	$ 3,042	$ 3,551
Weighted- Average Lives	8 years	8 years

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Fair Value Measurements (Assets And Liabilities Measured At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2012	Dec. 31, 2012	Sep. 30, 2012 Rusnano	Sep. 30, 2013 Level 1	Dec. 31, 2012 Level 1	Sep. 30, 2013 Level 2	Dec. 31, 2012 Level 2	Sep. 30, 2013 Level 3	Dec. 31, 2012 Level 3	Sep. 30, 2013 Cash equivalents	Dec. 31, 2012 Cash equivalents	Sep. 30, 2013 Cash equivalents Level 1	Dec. 31, 2012 Cash equivalents Level 1	Sep. 30, 2013 Auction rate securities	Dec. 31, 2012 Auction rate securities	Sep. 30, 2013 Auction rate securities Level 3	Dec. 31, 2012 Auction rate securities Level 3	Sep. 30, 2013 Contingent purchase consideration	Dec. 31, 2012 Contingent purchase consideration	Sep. 30, 2013 Contingent purchase consideration Level 3	Dec. 31, 2012 Contingent purchase consideration Level 3	Sep. 30, 2013 Interest rate swap	Dec. 31, 2012 Interest rate swap	Sep. 30, 2013 Interest rate swap Level 2	Dec. 31, 2012 Interest rate swap Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 220,366			$ 238,161		$ 219,248	$ 237,049			$ 1,118	$ 1,112	$ 219,248	$ 237,049	$ 219,248	$ 237,049	$ 1,118	$ 1,112	$ 1,118	$ 1,112
Total liabilities	868			3,878				493	855	375	3,023									375	3,023	375	3,023	493	855	493	855
Increase in accrued liability for the estimated fair value of contingent consideration	196	2,463	987
Redeemable noncontrolling interest fair value					$ 77

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Fair Value Measurements (Fair Value Of Auction Rate Securities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Auction rate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	$ 1,108	$ 1,116	$ 1,112	$ 1,104
Period transactions	0	0	0	0
Change in fair value	2	2	6	6
Redeemed by issuers at par	0	0	0	0
Balance, end of period	1,118	1,110	1,118	1,110
Contingent purchase consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	597	559	3,023	999
Period transactions	0	1,847	0	1,847
Adjustment for determination of final payment	0	0	0	987
Change in fair value	(184)	0	(2,648)	28
Reclass of determined final payment	0	0	0	(1,417)
Balance, end of period	375	2,444	375	2,444
Warrant
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance, beginning of period	0	0	0	77
Period transactions	0	0	0	(77)
Change in fair value	0	0	0	0
Balance, end of period	$ 0	$ 0	$ 0	$ 0

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Net Income Attributable To IPG Photonics Corporation Per Share

9 Months Ended

Sep. 30, 2013

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 September 30,				Nine Months Ended September 30,
	2013		2012		2013		2012
Net income attributable to IPG Photonics Corporation	$	42,338	$	42,435	$	119,185	$	110,092
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		493
Net income attributable to common stockholders	42,338		42,435		119,185		110,585
Weighted average shares	51,495		51,090		51,474		50,204
Dilutive effect of common stock equivalents	872		1,012		872		1,077
Diluted weighted average common shares	52,367		52,102		52,346		51,281
Basic net income attributable to IPG Photonics Corporation per share	$	0.82	$	0.83	$	2.32	$	2.19
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		0.01
Basic net income attributable to common stockholders	$	0.82	$	0.83	$	2.32	$	2.20
Diluted net income attributable to IPG Photonics Corporation per share	$	0.81	$	0.81	$	2.28	$	2.15
Adjustments to redemption value of redeemable noncontrolling interests	—		—		—		0.01
Diluted net income attributable to common stockholders	$	0.81	$	0.81	$	2.28	$	2.16

The computation of diluted weighted average common shares excludes options to purchase 31,000 shares and 75,000 shares for the three months ended September 30, 2013 and 2012, respectively, and 210,000 shares and 9,000 shares for the nine months ended September 30, 2013 and 2012, respectively, because the effect would be anti-dilutive.

The Company computes net income per share in accordance with ASC 260-Earnings Per Share. Under the provisions of ASC 260, the Company is required to present basic and diluted earnings per share information separately for each class of equity instruments that participate in any income distribution with primary equity instruments. The Company calculates earnings per share in periods where a class of common stock was redeemable for other than fair value through the application of the two-class method. Until June 29, 2012, the Company had redeemable noncontrolling interests reported in the accompanying consolidated financial statements related to a 22.5% minority interest of the Company's subsidiary, NTO IRE-Polus.

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Accrued Expenses And Other Liabilities (Components Of Accrued Expenses And Other Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Payables and Accruals [Abstract]
Accrued compensation	$ 24,863	$ 21,972
Customer deposits and deferred revenue	19,929	17,174
Current portion of accrued warranty	7,697	7,838
Other	7,064	4,467
Total	$ 59,553	$ 51,451

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Product Warranties (Summary Of Product Warranty Activity) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]
Balance at January 1	$ 10,714	$ 8,631
Provision for warranty accrual	7,867	6,548
Warranty claims and other reductions	(4,977)	(4,775)
Foreign currency translation	136	(14)
Balance at September 30	$ 13,740	$ 10,390

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Goodwill And Intangibles

9 Months Ended

Sep. 30, 2013

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 nine months ended September 30, 2013:

	Amounts
Balance at January 1	$	2,898
Adjustment	(95		)
Impairment	(2,803		)
Total goodwill arising from acquisition	455
Balance at September 30	$	455

Intangible assets, subject to amortization, consisted of the following:

	September 30, 2013								December 31, 2012
	Gross  Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted- Average  Lives	Gross  Carrying Amount		Accumulated Amortization			Net  Carrying Amount		Weighted- Average  Lives
Patents	$	4,667	$	(4,066	)	$	601	6 Years	$	4,664	$	(4,193	)	$	471	6 Years
Customer relationships	4,054		(3,101		)	953		5 Years	3,993		(2,363		)	1,630		5 Years
Production know-how	7,029		(1,494		)	5,535		8 Years	2,514		(656		)	1,858		9 Years
Technology, trademark and tradename	4,249		(1,207		)	3,042		8 Years	4,229		(678		)	3,551		8 Years
	$	19,999	$	(9,868	)	$	10,131		$	15,400	$	(7,890	)	$	7,510

On March 13, 2013, the Company acquired the working capital and long term assets of Mobius Photonics Inc., a manufacturer of high-power pulsed ultra-violet ("UV") fiber lasers for micro-machining and fine processing applications. As a result of the acquisition, the Company recorded intangible assets of $4,480 of which all related to technology and know-how. Additionally, the Company recorded $455 of goodwill related to expected synergies for the Company's expansion of product offerings with UV and short pulsed fiber lasers.

Amortization expense for the three months ended September 30, 2013 and 2012 was $596 and $572, respectively. Amortization expense for the nine months ended September 30, 2013 and 2012 was $1,705 and $1,669, respectively.The estimated future amortization expense for intangibles for the remainder of 2013 and subsequent years is as follows:

2013	2014	2015	2016	2017	Thereafter	Total
$596	$2,047	$1,637	$1,451	$1,451	$2,949	$10,131

In accordance with ASC 350-Intangibles-Goodwill and Other, the Company assesses the impairment of its long-lived assets including its definite-lived intangible assets and goodwill, at least annually for goodwill, and whenever changes in events or circumstances indicate that the carrying value of such assets may not be recoverable. During each reporting period, the Company assesses for factors that may be present which would cause an impairment review.

 During the second quarter of 2013, the Company undertook an impairment analysis of long-lived assets and goodwill related to IPG Microsystems ("IPGM"), the assets of which were acquired in September 2012. The Company undertook the analysis because of certain qualitative factors including a decline in sales and bookings due to underlying weakness in the markets IPGM serves.

The Company performed an impairment analysis to assess whether there was impairment of long-lived assets of IPGM including identifiable intangibles included in the table above using the guidance in ASU 360-10-35. The Company concluded that no impairment existed as the undiscounted cash flows from IPGM are forecasted to be greater than the carrying value of identified long-lived assets.

The Company carried out the two-step goodwill impairment test in accordance with the provisions of ASU 350-20-35. That analysis indicated that the fair value of IPGM, based on a discounted cash flow analysis, was less than the carrying value. The implied value of goodwill, as measured in step 2, was zero. Accordingly, the Company adjusted the value of goodwill associated with IPGM to $0. The adjustment was included in total other (expense) income, net.

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Financing Arrangements

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Financing Arrangements

FINANCING ARRANGEMENTS

The Company’s borrowings under existing financing arrangements consist of the following:

	September 30,			December 31,
	2013			2012
Revolving line-of-credit facilities:
European overdraft facilities	$	820		$	1,135
Euro line of credit	727			956
U.S. line of credit	—			351
Total	$	1,547		$	2,442
Term debt:
U.S. long-term note	$	13,000		$	14,000
Other notes payable	—			1,519
Less: current portion	(1,333		)	(1,505		)
Total long-term debt	$	11,667		$	14,014

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.

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Consolidated Statements Of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	COMMON STOCK	ADDITIONAL PAID-IN CAPITAL	RETAINED EARNINGS	ACCUMULATED OTHER COMPREHENSIVE LOSS	TOTAL IPG PHOTONICS CORPORATION STOCKHOLDERS’ EQUITY	NONCONTROLLING INTERESTS
Balance at Dec. 31, 2011		$ 5	$ 332,585	$ 122,833	$ (12,100)		$ 287
Balance, shares at Dec. 31, 2011		47,616,115
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			6,358
Exercise of stock options, shares		385,428
Exercise of stock options and related tax benefit from exercise		0	7,585
Common stock issued under employee stock purchase plan, shares		18,654
Common stock issued under employee stock purchase plan		0	560
Common stock issued in a public offering, shares		3,250,000
Purchase of redeemable noncontrolling interests (NCI)			(7,794)
Common stock issued in follow-on public offering		0	167,964
Premium on purchase of NCI			404
Net income attributable to IPG Photonics Corporation	110,092			110,092
Adjustments to redemption value of redeemable NCI	493			493
Translation adjustments	3,676				3,676
Unrealized gain on derivatives, net of tax	130				130
Purchase of NCI & redeemable NCI					(3,243)
Attribution to NCI & redeemable NCI					832
Sale of NCI							(700)
Other comprehensive income attributable to NCI	(1,908)						9
Premium on purchase of NCI							404
Balance at Sep. 30, 2012	729,572	5	506,854	233,418	(10,705)	729,572	0
Balance, shares at Sep. 30, 2012		51,270,197
Balance at Dec. 31, 2012		5	511,039	234,977	(3,094)		0
Balance, shares at Dec. 31, 2012		51,359,247
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation			8,604
Exercise of stock options, shares		231,408
Exercise of stock options and related tax benefit from exercise		0	6,120
Common stock issued under employee stock purchase plan, shares		13,913
Common stock issued under employee stock purchase plan		0	718
Common stock issued in a public offering, shares		0
Purchase of redeemable noncontrolling interests (NCI)			0
Common stock issued in follow-on public offering		0	0
Premium on purchase of NCI			0
Net income attributable to IPG Photonics Corporation	119,185			119,185
Adjustments to redemption value of redeemable NCI	0			0
Translation adjustments	(2,094)				(2,094)
Unrealized gain on derivatives, net of tax	227				227
Purchase of NCI & redeemable NCI					0
Attribution to NCI & redeemable NCI					0
Sale of NCI							0
Other comprehensive income attributable to NCI	0						0
Premium on purchase of NCI							0
Balance at Sep. 30, 2013	$ 875,687	$ 5	$ 526,481	$ 354,162	$ (4,961)	$ 875,687	$ 0
Balance, shares at Sep. 30, 2013		51,604,568

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Derivative Financial Instruments (Fair Value Of Cash Flow Hedges) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	$ 13,000,000	[1]	$ 14,000,000	[1]
Foreign currency forward contract
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	0
Interest rate swap
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	13,000,000	[1]	14,000,000	[1]
Other Assets
Derivatives, Fair Value [Line Items]
Derivative asset fair value	0		0
Other Assets | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative asset fair value	0		0
Other Long-Term Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability fair value	493,000		855,000
Other Long-Term Liabilities | Interest rate swap
Derivatives, Fair Value [Line Items]
Derivative liability fair value	493,000		855,000
Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	$ 0

[1] Notional amounts represent the gross contract/notional amount of the derivatives outstanding.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2013

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. In August 2013, the Company was sued for misappropriation of certain trade secrets, unfair trade practices, and correction of inventorship on a patent owned by the Company related to beam couplers and beam switches. The plaintiff seeks damages in an unspecified amount, double damages for misappropriation of trade secrets and treble damages for unfair trade practices. The Company has filed to dismiss the trade secret misappropriation claims. The Company intends to vigorously defend the claims. At this time, no loss is deemed probable and no amounts have been accrued in respect of this contingency.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The Company’s financial instruments consist of cash equivalents, accounts receivable, auction rate securities, accounts payable, drawings on revolving lines of credit, long-term debt and certain derivative instruments.

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, accounts receivable, accounts payable and drawings on revolving lines of credit are considered reasonable estimates of their fair market value, due to the short maturity of these instruments or as a result of the competitive market interest rates, which have been negotiated. If measured at fair value, accounts receivable and accounts payable would be classified as Level 3 and drawings on the revolving lines of credit would be classified as Level 2.

The following table presents information about the Company’s cash equivalents and assets and liabilities measured at fair value:

			Fair Value Measurements at September 30, 2013
	Total		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	219,248	$	219,248	$	—	$	—
Auction rate securities	1,118		—		—		1,118
Total assets	$	220,366	$	219,248	$	—	$	1,118
Liabilities
Contingent purchase consideration	$	375	$	—	$	—	$	375
Interest rate swaps	493		—		493		—
Total liabilities	$	868	$	—	$	493	$	375
			Fair Value Measurements at December 31, 2012
	Total		Level 1		Level 2		Level 3
Assets
Cash equivalents	$	237,049	$	237,049	$	—	$	—
Auction rate securities	1,112		—		—		1,112
Total assets	$	238,161	$	237,049	$	—	$	1,112
Liabilities
Contingent purchase consideration	$	3,023	$	—	$	—	$	3,023
Interest rate swaps	855		—		855		—
Total liabilities	$	3,878	$	—	$	855	$	3,023

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 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 consideration.

During the second quarter of 2013, the Company reduced the fair value of the accrued contingent purchase consideration associated with a 2012 purchase of a manufacturer of laser-based systems by $2,463 as management assessed that there was no possibility that any earn-out amounts included in the purchase agreement with the former owners would be achieved (see Note 9). During the third quarter of 2013, the Company reduced the fair value of the accrued contingent purchase consideration associated with a 2011 purchase of a technology developer by $196. These adjustments are included in total other (expense) income, net.

During the first quarter of 2012, the Company determined a final payment of contingent consideration and other related matters in association with the purchase of a technology company in 2010, increased the liability by $987 and reclassed the revised obligation to accrued expenses. The adjustment was included in total other (expense) income, net. As the payment was then fixed, it was no longer measured at its fair value.

Also, during the nine months ended September 30, 2012, the Company terminated a warrant held by a former investor in NTO IRE-Polus as part of the redemption of the investor's redeemable noncontrolling interest for its fair value of $77.

	Three Months Ended September 30,					Nine Months Ended September 30,
	2013			2012		2013			2012
Auction Rate Securities
Balance, beginning of period	$	1,116		$	1,108	$	1,112		$	1,104
Period transactions	—			—		—			—
Change in fair value	2			2		6			6
Redeemed by issuers at par	—			—		—			—
Balance, end of period	$	1,118		$	1,110	$	1,118		$	1,110
Contingent Purchase Consideration
Balance, beginning of period	$	559		$	597	$	3,023		$	999
Period transactions	—			1,847		—			1,847
Adjustment for determination of final payment	—			—		—			987
Change in fair value	(184		)	—		(2,648		)	28
Reclass of determined final payment	—			—		—			(1,417		)
Balance, end of period	$	375		$	2,444	$	375		$	2,444
Warrant
Balance, beginning of period	$	—		$	—	$	—		$	77
Period transactions	—			—		—			(77		)
Change in fair value	—			—		—			—
Balance, end of period	$	—		$	—	$	—		$	—

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Financing Arrangements (Tables)

9 Months Ended

Sep. 30, 2013

Debt Disclosure [Abstract]

Borrowings Under Existing Financing Arrangements

The Company’s borrowings under existing financing arrangements consist of the following:

	September 30,			December 31,
	2013			2012
Revolving line-of-credit facilities:
European overdraft facilities	$	820		$	1,135
Euro line of credit	727			956
U.S. line of credit	—			351
Total	$	1,547		$	2,442
Term debt:
U.S. long-term note	$	13,000		$	14,000
Other notes payable	—			1,519
Less: current portion	(1,333		)	(1,505		)
Total long-term debt	$	11,667		$	14,014

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Inventories (Tables)

9 Months Ended

Sep. 30, 2013

Inventory Disclosure [Abstract]

Components Of Inventories

Inventories consist of the following:

	September 30,		December 31,
	2013		2012
Components and raw materials	$	56,738	$	53,436
Work-in-process	60,391		46,240
Finished goods	54,139		39,942
Total	$	171,268	$	139,618

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Document And Entity Information	9 Months Ended
	Sep. 30, 2013	Nov. 05, 2013
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2013
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2013
Entity Registrant Name	IPG PHOTONICS CORP
Entity Central Index Key	0001111928
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		51,680,453

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Accrued Expenses And Other Liabilities (Tables)

9 Months Ended

Sep. 30, 2013

Payables and Accruals [Abstract]

Components Of Accrued Expenses And Other Liabilities

Accrued expenses and other liabilities consist of the following:

	September 30,		December 31,
	2013		2012
Accrued compensation	$	24,863	$	21,972
Customer deposits and deferred revenue	19,929		17,174
Current portion of accrued warranty	7,697		7,838
Other	7,064		4,467
Total	$	59,553	$	51,451