GT Advanced (GTAT) 10-Q 7 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 28, 2013	Nov. 01, 2013
Document and Entity Information	'	'
Entity Registrant Name	'GT Advanced Technologies Inc.	'
Entity Central Index Key	'0001394954	'
Document Type	'10-Q	'
Document Period End Date	28-Sep-13	'
Amendment Flag	'false	'
Current Fiscal Year End Date	'--12-31	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	123,830,191
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 28, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Current assets:	'	'
Cash and cash equivalents	$258,472	$418,095
Accounts receivable, net	7,471	23,829
Inventories	123,189	133,286
Deferred costs	2,274	30,248
Vendor advances	12,630	32,440
Deferred income taxes	22,937	28,226
Refundable income taxes	'	1,516
Prepaid expenses and other current assets	6,340	9,168
Total current assets	433,313	676,808
Property, plant and equipment, net	65,755	77,980
Other assets	92,081	86,920
Intangible assets, net	98,918	90,516
Deferred cost	26,344	24,423
Goodwill	54,765	48,021
Total assets	771,176	1,004,668
Current liabilities:	'	'
Current portion of long-term debt	9,063	7,250
Accounts payable	20,326	44,848
Accrued expenses	46,947	30,928
Contingent consideration	1,294	4,901
Customer deposits	36,218	111,777
Deferred revenue	13,700	86,098
Accrued income taxes	11,982	21,716
Total current liabilities	139,530	307,518
Long-term debt	86,875	132,313
Convertible notes	165,390	157,440
Deferred income taxes	6,034	24,459
Customer deposits	55,598	71,340
Deferred revenue	48,613	35,848
Contingent consideration	16,229	5,414
Other non-current liabilities	2,418	2,323
Accrued income taxes	27,748	25,762
Total liabilities	548,435	762,417
Commitments and contingencies (Note 14)	'	'
Stockholders' equity:	'	'
Preferred stock, 10,000 shares authorized, none issued and outstanding	'	'
Common stock, $0.01 par value; 500,000 shares authorized, 123,758 and 119,293 shares issued and outstanding as of September 28, 2013 and December 31, 2012, respectively	1,237	1,193
Additional paid-in capital	208,631	183,565
Accumulated other comprehensive income	1,066	806
Retained earnings	11,807	56,687
Total stockholders' equity	222,741	242,251
Total liabilities and stockholders' equity	$771,176	$1,004,668

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 28, 2013	Dec. 31, 2012
In Thousands, except Per Share data, unless otherwise specified
Condensed Consolidated Balance Sheets	'	'
Preferred stock, shares authorized	10,000	10,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized	500,000	500,000
Common stock, shares issued	123,758	119,293
Common stock, shares outstanding	123,758	119,293

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Condensed Consolidated Statements of Operations	'	'	'	'
Revenue	$40,291	$110,061	$266,397	$631,203
Cost of revenue	22,514	75,033	176,389	383,641
Gross profit	17,777	35,028	90,008	247,562
Operating expenses:	'	'	'	'
Research and development	21,075	18,767	56,039	47,954
Selling and marketing	3,496	3,123	10,870	9,657
General and administrative	17,427	15,428	48,507	45,731
Contingent consideration expense (income)	4,971	-9,943	997	-9,261
Restructuring charges	4,010	'	6,868	'
Amortization of intangible assets	2,976	2,538	8,098	7,631
Total operating expenses	53,955	29,913	131,379	101,712
(Loss) income from operations	-36,178	5,115	-41,371	145,850
Other income (expense):	'	'	'	'
Interest income	122	27	286	50
Interest expense	-6,456	-1,620	-20,462	-3,398
Other, net	62	-431	73	-968
(Loss) income before income taxes	-42,450	3,091	-61,474	141,534
(Benefit) provision for income taxes	-4,304	747	-16,594	45,360
Net (loss) income	($38,146)	$2,344	($44,880)	$96,174
Net (loss) income per share:	'	'	'	'
Basic (in dollars per share)	($0.31)	$0.02	($0.37)	$0.81
Diluted (in dollars per share)	($0.31)	$0.02	($0.37)	$0.80
Weighted-average number of shares used in per share calculations:	'	'	'	'
Basic (in shares)	122,183	118,769	119,752	118,873
Diluted (in shares)	122,183	119,874	119,752	120,126

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive (Loss) Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Condensed Consolidated Statements of Comprehensive (Loss) Income	'	'	'	'
Net (loss) income	($38,146)	$2,344	($44,880)	$96,174
Other comprehensive (loss) income, net of tax:	'	'	'	'
Change in fair value of cash flow hedging instruments, net of tax effect of $0, ($274), $11 and ($1,268), respectively	'	338	-54	1,752
Foreign currency translation adjustments	66	192	314	-62
Other comprehensive income	66	530	260	1,690
Comprehensive (loss) income	($38,080)	$2,874	($44,620)	$97,864

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive (Loss) Income (Parenthetical) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Condensed Consolidated Statements of Comprehensive (Loss) Income	'	'	'	'
Change in fair value of cash flow hedging instruments, tax effect	$0	($274)	$11	($1,268)

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012
Cash flows from operating activities:	'	'
Net (loss) income	($44,880)	$96,174
Adjustments to reconcile net (loss) income to net cash used in operating activities:	'	'
Amortization expense	8,098	7,631
Depreciation expense	11,881	10,256
Convertible notes discount amortization	7,950	62
Contingent consideration expense (income)	997	-13,991
Impairment on longed lived assets	4,010	'
Deferred income tax expense (benefit)	-23,057	-6,275
Provision for excess and obsolete inventory	1,848	4,106
Share-based compensation expense	13,883	13,091
Excess tax benefits from share-based awards	-242	-285
Amortization of deferred financing costs	2,914	697
Loss on disposal of assets	966	2,038
Other adjustments, net	500	864
Changes in operating assets and liabilities (excluding impact of acquired assets and assumed liabilities):	'	'
Restricted cash	'	96,202
Accounts receivable	17,510	39,185
Inventories	13,246	-22,435
Deferred costs	26,069	189,172
Vendor advances	21,747	-23,204
Prepaid expenses and other assets	1,542	2,086
Accounts payable and accrued expenses	-14,738	-25,495
Customer deposits	-93,812	-56,283
Deferred revenue	-59,633	-337,900
Income taxes	-6,216	896
Other, net	254	704
Net cash used in operating activities	-109,163	-22,704
Cash flows from investing activities:	'	'
Purchases and deposits on property, plant and equipment	-3,710	-35,541
Other investing activities	52	293
Net cash used in investing activities	-3,658	-35,248
Cash flows from financing activities:	'	'
Borrowings under credit facility	'	145,000
Principal payments under credit facility	-43,625	-1,813
Proceeds from issuance of convertible notes	'	220,000
Cash paid for bond hedges	'	-57,923
Proceeds from issuance of warrants	'	41,623
Proceeds and related excess tax benefits from exercise of share-based awards	358	1,507
Payments of contingent consideration from business combinations	'	-4,903
Payments related to share repurchases to satisfy statutory minimum tax withholdings	-1,516	-1,153
Deferred financing costs	-2,266	-11,471
Other financing activities	-35	-498
Net cash (used in) provided by financing activities	-47,084	330,369
Effect of foreign exchange rates on cash	282	-76
(Decrease) increase in cash and cash equivalents	-159,623	272,341
Cash and cash equivalents at beginning of period	418,095	206,878
Cash and cash equivalents at end of period	258,472	479,219
Supplemental cash flow information:	'	'
Cash paid for interest	8,254	2,470
Non-cash investing and financing activities:	'	'
Decrease in accounts payable and accrued expenses for property, plant and equipment	-683	-3,469
Fair value of shares issued for acquisition	14,463	'
Contingent consideration issued for acquisition	6,211	'
Unpaid deferred financing costs	'	$635

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 28, 2013
Basis of Presentation	'
Basis of Presentation	'
	1. Basis of Presentation
	These accompanying unaudited condensed consolidated financial statements of GT Advanced Technologies Inc. and subsidiaries (the “Company”) have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and the Securities and Exchange Commission’s (“SEC”) instructions for interim financial information. In the opinion of management, the accompanying financial statements contain all adjustments consisting of normal recurring adjustments necessary to present fairly in all material respects the financial position, results of operations and cash flows for the periods presented. The results for the three and nine months ended September 28, 2013 are not necessarily indicative of the results to be expected for any other interim period or for any future year. The accompanying financial statements should be read in conjunction with the audited consolidated financial statements and footnotes included in the Company’s Transition Report on Form 10-K (“Transition Report”) for the nine-month period ended December 31, 2012, filed with the SEC on March 1, 2013.
	The condensed consolidated balance sheet as of December 31, 2012 has been derived from the audited financial statements as of that date but does not include all of the information and footnotes required by U.S. GAAP for complete financial statements.
	Reclassifications
	Certain reclassifications have been made to prior year financial statements to conform to the current year presentation. Specifically, contingent consideration income of $9,943 and $9,261 for the three and nine-month periods ended September 29, 2012, respectively, was previously included in general and administrative expense, but is now stated separately in the Company’s condensed consolidated statements of operations.
	Recent Developments
	The polysilicon, photovoltaic (“PV”) and sapphire (including LED) industries continue to face the significant challenges described in the Company’s Transition Report, including, among others, (i) oversupply of, or limited demand for, end products that are manufactured with equipment sold by the Company; (ii) ongoing trade disputes between the U.S., European Union and South Korea, on the one hand, and China on the other, which have adversely impacted the businesses of the Company’s customers in China (where a majority of the Company’s customers are located) continues to create uncertainty among the Company’s customers and the industries the Company serves; (iii) liquidity challenges being faced by companies in the polysilicon, PV and sapphire industries, due in part to changes in the global capital markets which have resulted in a more stringent lending environment which in turn has caused decreased spending within the industries the Company serves, as customers try to preserve their liquidity; (iv) deterioration of the financial health of the Company’s customers and (v) structural changes in the PV industry which, the Company believes, will require that any recovery in the PV market will be driven by changes in monocrystalline technology and development of other materials for higher efficiency solar cells. As a result, demand for existing multicrystalline products (DSS) will be very limited.
	Taking these factors into account, during December 2012, the Company took a number of strategic actions, including, (i) intending to discontinue any significant future investments in the DSS product line and (ii) determining that the vast majority of the amounts in the Company’s backlog attributable to DSS equipment is at risk of not converting into revenue and, accordingly, future sales of DSS will be limited. The Company has taken a number of strategic actions, including idling the Company’s continuously-fed Czochralski (HiCz) Hazelwood facility in St. Louis and shifting the related research and development to Merrimack, New Hampshire. HiCz is a growth technology designed to enable the production of high efficiency monocrystalline solar cells. The factors above triggered impairment assessments that resulted in impairment charges in December 2012 of $60,192 related to PV inventory, $8,352 related to all remaining PV vendor advances, $57,037 related to PV goodwill, and $29,261 related to certain long-lived, intangible and other assets located at the Company’s HiCz Hazelwood facility.
	For the three month period ended September 28, 2013, the Company incurred a loss from operations of $36,178 and a net loss of $38,146. For the nine month period ended September 28, 2013, the Company incurred a loss from operations of $41,371, a net loss of $44,880, and used $109,163 in cash for operating activities.
	On October 30, 2013, the Company terminated the 2012 Credit Agreement (the “Credit Agreement”).  As of September 28, 2013, there was approximately $96,000 outstanding borrowings under the 2012 Term Facility which was paid in full on October 30, 2013 by using available cash.  As of October 30, 2013, there are no amounts outstanding under the 2012 Revolving Credit Facility and no outstanding stand-by letters of credit under the 2012 Revolving Credit Facility.  In connection with the termination of the 2012 Credit Agreement, the Company expects to recognize a charge in the fourth quarter of approximately $3,639 relating to deferred issuance costs that will be written off upon the termination of the agreement.  For additional information, refer to Note 21, Subsequent Events.
	Management believes that the Company has sufficient cash resources to fund operations for at least the next twelve months.
	SDR-400™
	During the nine months ended September 28, 2013, the Company determined that it had obtained sufficient evidence that the SDR-400™, a product within the Polysilicon business unit, is an established product in accordance with the Company’s revenue recognition policy and accordingly, there is no longer uncertainty around meeting the requirements of customer acceptance conditions in agreements that contain the standard or demonstrated objective specifications of the SDR-400™. In concluding that the SDR-400™ is now an established product, the Company considered the stability of the product’s technology, the ability to test the product prior to shipment, and the historical performance results of over 30 product installations at one of our customers’ facilities.  As a result of classifying the SDR-400™ as an established product, the Company recognized revenue and gross profit of $3,080 and $681, and $148,740 and $59,501, in the three and nine months ended September 28, 2013, respectively, from two customer arrangements that included SDR-400™’s prior to formal customer acceptance of the products.  Non-refundable payments received under these customer arrangements exceed the recognized revenue and were previously recorded as deferred revenue. The Company continues to report deferred revenue related to these arrangements for advance payments on other deliverables included in the arrangements.  Revenue recognized in the nine months ended September 28, 2013 related to the SDR-400™ was material to both the Polysilicon reporting segment and the consolidated results within the Company’s condensed consolidated statement of operations.

Significant_Accounting_Policie

Significant Accounting Policies	9 Months Ended
	Sep. 28, 2013
Significant Accounting Policies	'
Significant Accounting Policies	'
	2. Significant Accounting Policies
	The Company’s significant accounting policies are disclosed in Note 2 to the Consolidated Financial Statements included in the Transition Report. There were no significant changes to the significant accounting policies during the nine months ended September 28, 2013.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 28, 2013
Recent Accounting Pronouncements	'
Recent Accounting Pronouncements	'
	3. Recent Accounting Pronouncements
	In July 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2013-11, Income Taxes (Topic 740): Presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The guidance eliminates diversity in practice surrounding the presentation of unrecognized tax benefits when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. The new guidance requires entities to net an unrecognized tax benefit with a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward if the carryforward would be used to settle additional tax due upon disallowance of a tax position. The amendment is effective for fiscal periods beginning after December 15, 2013 with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our financial statements.
	Recently Adopted Accounting Pronouncements
	Effective January 1, 2013, the Company adopted Accounting Standards Update (ASU) No. 2013-02, Comprehensive Income (Topic 220): Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income. The guidance is intended to provide disclosure on items reclassified out of accumulated other comprehensive income either in the notes or parenthetically on the face of the income statement. The required disclosure is in Note 18 below.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 28, 2013
Acquisitions	'
Acquisitions	'
	4. Acquisitions
	Acquisition of Certain Assets of Thermal Technology, LLC
	On May 16, 2013, the Company acquired substantially all of the business of Thermal Technology, LLC, (“Thermal Technology”), a developer and seller of a wide range of high temperature thermal and vacuum products used in the fabrication of advanced materials that are deployed across multiple industries including LED, medical devices, oil and gas and automotive.  This acquisition was achieved by the Company acquiring an entity to which certain assets and trade payables of Thermal Technology had been transferred immediately prior to the acquisition.  The acquisition of Thermal Technology provides the Company with key technologies that will allow the Company, it believes, to address new markets with production equipment options that can be optimized around customers’ specific needs. The purchase consideration consisted of 3.4 million shares of the Company’s common stock valued at an aggregate of $14,463 (as of the date of acquisition) and potential contingent consideration of $35,000 based upon meeting certain financial metrics. The final purchase price is subject to a net working capital adjustment, dependent upon the level of working capital at the acquisition date, that has not yet been finalized.  The fair value of the contingent consideration was $6,211 at the date of acquisition.
	The transaction has been accounted for as a business combination and the results are included in the Company’s results of operations from May 16, 2013, the date of acquisition. The acquired business contributed revenues of $3,545 and a loss of $3,071 to the consolidated results of the Company for the period from acquisition to September 28, 2013. The results of the acquired business are included in the Company’s sapphire business reporting segment.
	Significant judgment is required in estimating the fair value of intangible assets acquired in a business combination and in assigning their respective useful lives. The fair value estimates are based on available historical information and on future expectations and assumptions deemed reasonable by management.
	The Company employs the income method to estimate the fair value of intangible assets, which is based on forecasts of the expected future cash flows attributable to the respective assets. Significant estimates and assumptions inherent in the valuations reflect a consideration of other marketplace participants, and include the amount and timing of future cash flows (including expected growth rates and profitability), the underlying product life cycles, economic barriers to entry, a brand’s relative market position and the discount rate applied to the cash flows, among others.
	Each period the Company will revalue the contingent consideration obligations associated with the acquisition to fair value and record changes in the fair value as contingent consideration expense or income. Increases or decreases in the fair value of the contingent consideration obligations can result from changes in assumed discount periods and rates, changes in the assumed timing and amount of revenue and expense estimates and changes in assumed probability with respect to the attainment of certain financial and operational metrics. Significant judgment is employed in determining these assumptions as of the acquisition date and for each subsequent period. Accordingly, future business and economic conditions, as well as changes in any of the assumptions described above, can materially impact the amount of contingent consideration expense (income) recorded in any given period.
	As of September 28, 2013, the purchase price (including the estimated contingent consideration) and related allocations for the acquisition are preliminary. The Company is currently in the process of investigating the facts and circumstances existing as of the acquisition date in order to finalize its valuation and establish the related tax basis. As a result of the preliminary purchase price allocation, the Company recognized $6,744 of goodwill, which is primarily due to the expected future cash flows from synergies with the operations of the Company and assembled workforce. The goodwill created by the transaction is nondeductible for tax purposes. A summary of the preliminary purchase price allocation for the acquisition of Thermal Technology business is as follows:
	Fair value of consideration transferred:
	Common stock	$	14,463
	Contingent consideration obligations	6,211
	Preliminary estimate of net working capital adjustment	(735		)
	Total fair value of consideration	$	19,939
	Fair value of assets acquired and liabilities assumed:
	Accounts receivable	$	1,008
	Inventory	7,861
	Property, plant and equipment	1,700
	Deferred tax asset	411
	Other assets	439
	Intangible assets	14,500
	Goodwill	6,744
	Accounts payable and accrued expenses	(7,057		)
	Customer deposits	(2,509		)
	Deferred tax liability	(3,149		)
	Other current liabilities	(9		)
	Total net assets acquired	$	19,939
	The purchase consideration includes contingent consideration payable by the Company upon the attainment of certain financial targets through the period ending December 31, 2018. Specifically, the contingent consideration is based upon a portion of revenue achieved for the remainder of 2013 to 2018, subject to certain thresholds and a cap on total payments. The Company determined the fair value of the contingent consideration obligations based on a probability-weighted income approach derived from future revenue estimates. The undiscounted range of outcomes that the Company used to value the contingent consideration arrangement was between $7,507 and $20,205. During the three and nine months ended September 28, 2013, the Company recorded contingent consideration income of $1,075 and $934, respectively, related to change in the fair value of the liability at September 28, 2013.
	The Company incurred transaction costs of $1,188, which consisted primarily of legal and accounting fees. These costs have been recorded as general and administrative expense for the nine months ended September 28, 2013. The acquisition of Thermal Technology’s business did not have a material effect on the Company’s results of operations. Pro forma results of operations have not been presented due to the immaterial impact the amounts would have had on the Company’s historical results of operations.
	Acquisition of Certain Assets of Twin Creeks Technologies, Inc.
	On November 8, 2012, the Company acquired certain assets and intellectual property of Twin Creeks Technologies, Inc. (“Twin Creeks”), a privately owned company involved in the development of an ion implanter technology, which the Company refers to as the Hyperion ion implanter. The assets were purchased from Twin Creeks’ lenders in a private sale for total consideration with a fair value of $15,372. The purchase consideration consisted of $10,172 in cash and a potential additional $40,000 of contingent consideration. The fair value of the contingent consideration was estimated at $5,200 at the date of acquisition.
	The acquisition of these select assets, including the associated in-process research and development, is intended to have a broad application in the production of engineered substrates for power semiconductors, uses within the sapphire and LED industries and thin wafers for solar applications and certain other potential applications. In addition, the Company expects to pursue the development of thin sapphire laminates for use in applications such as cover and touch screen devices.
	The transaction has been accounted for as a business combination and is included in the Company’s results of operations from the acquisition date of November 8, 2012. The acquired assets did not contribute revenues from the acquisition date to September 28, 2013.  The goodwill created by the transaction is expected to be deductible for tax purposes.  The results of the acquired assets, including goodwill, are included in the Company’s PV and sapphire segments.
	As of September 28, 2013, the valuation of acquired assets, and assumed liabilities is preliminary. The Company is in the process of investigating the facts and circumstances existing as of the acquisition date in order to finalize its valuation. Based on new information gathered about facts and circumstances that existed as of the acquisition date related to the valuation of certain acquired assets and assumed liabilities, the Company updated the preliminary valuations of assets acquired during the three months ended March 30, 2013 which resulted in an increase to goodwill of $2,000 and a decrease to deferred tax assets of $2,000 as reflected in the table below. The adjustments have been retrospectively applied to the December 31, 2012 balance sheet. These adjustments had no impact on the statement of operations or statement of cash flows. A summary of the preliminary purchase price allocation for the acquisition of certain assets and assumed liabilities of Twin Creeks is as follows:
	Fair value of consideration transferred:
	Cash	$	10,172
	Contingent consideration obligations	5,200
	Total fair value of consideration	$	15,372
	Fair value of assets acquired and liabilities assumed:
	Property, plant and equipment	$	1,529
	Other assets	23
	In-process research and development	12,300
	Goodwill	2,907
	Accounts payable	(1,362		)
	Other current liabilities	(25		)
	Total net assets acquired	$	15,372
	The purchase consideration includes contingent consideration payable by the Company in the form of a royalty on net sales of hydrogen ion implantation systems, related equipment, parts and accessories and materials made from hydrogen ion implantation systems and of royalties from any sub-licenses granted by the Company of the underlying intellectual property acquired. These payments are subject to the Company’s right to set-off up to $6,000 for infringement claims brought by third-parties related to the intellectual property acquired. The royalty amount payable is capped at the earlier of payment of $40,000 of royalties or the end of the 15-year term of the license agreement. The Company determined the fair value of the contingent consideration obligations based on a probability-weighted income approach derived from assessments of future revenue. The weighted-average undiscounted probable outcome that the Company initially used to value the contingent consideration arrangement was $27,562. During the three and nine months ended September 28, 2013, the Company recorded contingent consideration expense of $6,046 and $6,747, respectively, related to change in the fair value of the liability at September 28, 2013.
	Intangible assets are composed of the estimated fair value of acquired in-process research and development (“IPR&D”) related to the Hyperion™ ion implanter technology. At the date of acquisition and through September 28, 2013, the Hyperion™ ion implanter technology had not reached commercial technological feasibility nor had an alternative future use and is therefore considered to be IPR&D. The estimated fair value was determined using a probability-weighted income approach, which discounts expected future cash flows to present value. The projected cash flows from the Hyperion™ tool were based on certain key assumptions, including estimates of future revenue and expenses and taking into account the stage of development of the technology at the acquisition date and the time and resources needed to complete development. The Company used a discount rate of 28% and cash flows that have been probability-adjusted to reflect the risks of product commercialization. This discount rate used is comparable to the estimated internal rate of return on Twin Creeks operations and represents the rate that market participants would use to value the intangible assets.
	The major risks and uncertainties associated with the timely and successful completion of development of the IPR&D include the Company’s ability to demonstrate technological feasibility of the product and to successfully complete this task within budgeted costs. Consequently, the eventual realized value of the acquired IPR&D may vary from its estimated fair value at the date of acquisition.
	The acquisition of certain select assets of Twin Creeks did not have a material effect on the Company’s results of operations for the three and nine months ended September 28, 2013. Pro forma results of operations have not been presented due to the immaterial impact the amounts would have had on the Company’s historical results of operations.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 28, 2013
Fair Value Measurements	'
Fair Value Measurements	'
	5. Fair Value Measurements
	Fair value is an exit price, representing the amount that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants based on assumptions that market participants would use in pricing an asset or liability. As a basis for classifying the assumptions used, a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value, is applied as follows: (Level 1) observable inputs such as quoted prices in active markets for identical assets or liabilities; (Level 2) inputs other than the quoted prices in active markets that are observable either directly or indirectly; and (Level 3) unobservable inputs in which there is little or no market data, which requires the Company to develop its own assumptions. This hierarchy requires the Company to use observable market data, when available, and to minimize the use of unobservable inputs when determining fair value. There were no transfers between such levels in the nine month period ended September 28, 2013.
	The following table provides the assets and liabilities measured and reported at fair value on a recurring basis at September 28, 2013 and December 31, 2012:
		September 28, 2013
		Total		Fair Value Measurements Using
		Carrying
		Value		(Level 1)			(Level 2)		(Level 3)
	Assets:
	Money market mutual funds	$	179,144	$	179,144		$	—	$	—
	Liabilities:
	Contingent consideration	$	17,523	$	—		$	—	$	17,523
		December 31, 2012
		Total		Fair Value Measurements Using
		Carrying
		Value		(Level 1)			(Level 2)		(Level 3)
	Assets:
	Money market mutual funds	$	200,041	$	200,041		$	—	$	—
	Forward foreign exchange contracts	230		—			230		—
	Liabilities:
	Contingent consideration	$	10,315	$	—		$	—	$	10,315
	The Company’s money market mutual funds are valued using readily available quoted market prices for identical assets.
	The Company’s counterparties to its forward foreign exchange contracts are financial institutions. These forward foreign exchange contracts are measured at fair value using a valuation which represents a good faith estimate of the midmarket value of the position, based on estimated bids and offers for the positions, which are updated each reporting period. The Company considers the effect of credit standings in these fair value measurements (level 2). There have been no changes in the valuation techniques used to measure the fair value of the Company’s forward foreign exchange contracts (see Note 8 below for additional information about the Company’s derivatives and hedging activities).
	The Company has classified contingent consideration related to its acquisitions within Level 3 of the fair value hierarchy because the fair value is derived using significant unobservable inputs, which include discount rates and probability-weighted cash flows. The Company determined the fair value of its contingent consideration obligations based on a probability-weighted income approach derived from financial performance estimates and probability assessments of the attainment of certain targets. The Company establishes discount rates to be utilized in its valuation models based on the cost to borrow that would be required by a market participant for similar instruments. In determining the probability of attaining certain technical, financial and operation targets, the Company utilizes data regarding similar milestone events from its own experience, while considering the inherent difficulties and uncertainties in developing a product. On a quarterly basis, the Company reassesses the probability factors associated with the financial, operational and technical targets for its contingent consideration obligations. Significant judgment is employed in determining the appropriateness of these assumptions as of the acquisition date and for each subsequent period.
	The key assumptions as of September 28, 2013 related to the contingent consideration from the acquisition of certain assets of Twin Creeks used in the model include: (i) discount rate of 28% for purposes of discounting the low and base case scenarios associated with achievement of the revenue based earn-out. The probabilities assigned to these scenarios were 25%, and 75% for the low and base case scenarios, respectively. An increase or decrease in the probability of achievement of any scenario could result in a significant increase or decrease to the estimated fair value of the contingent consideration liability.
	The key assumptions as of September 28, 2013 related to the contingent consideration from the acquisition of substantially all of the business of Thermal Technology used in the model include: (i) discount rate of 20.4% for purposes of discounting the most likely scenario associated with achievement of the revenue based earn-out. An increase or decrease in the probability of achievement of the projected revenues could result in a significant increase or decrease to the estimated fair value of the contingent consideration liability.
	During the three months ended June 29, 2013, the Company reversed the contingent consideration liability related to the Confluence Solar acquisition with a corresponding reduction to contingent consideration expense.  This reversal of approximately $4,816 was the result of failing to achieve the required operational and technical targets required to earn such consideration.
	The Company recorded contingent consideration expense (income) in the condensed consolidated statements of operations of $4,971 and $997 for the three and nine months ended September 28, 2013 and ($9,943) and ($9,261) for the three and nine months ended September 29, 2012, and all of which was allocated to the corporate services reporting segment.  Changes in the fair value of the Company’s Level 3 contingent consideration obligations during the three and nine months ended September 28, 2013 and three and nine months ended September 29, 2012 were as follows:
		Three Months Ended					Nine Months Ended
		September 28,		September 29,			September 28, 2013		September 29,
		2013		2012					2012
	Fair value as of the beginning of the period	$	12,552	$	14,762		$	10,315	$	23,713
	Acquisition date fair value of contingent consideration obligations related to acquisitions	—		—			6,211		—
	Changes in the fair value of contingent consideration obligations	4,971		(9,943		)	997		(9,261		)
	Payments of contingent consideration obligations	—		—			—		(9,633		)
	Fair value at the end of the period	$	17,523	$	4,819		$	17,523	$	4,819
	The carrying amounts reflected in the Company’s condensed consolidated balance sheets for cash, accounts receivable, prepaid expenses and other current assets, accounts payable, accrued expenses and customer deposits approximate fair value due to their short-term maturities. The Company did not hold any short-term investments at September 28, 2013 or December 31, 2012. The following table provides the carrying and fair values of the Company’s long-term debt obligations and convertible notes as of September 28, 2013 and December 31, 2012:
				Fair Value Measurements Using
	Description	Total Carrying Value		(Level 1)			(Level 2)		(Level 3)			Fair Value
	2012 Term Facility, including current portion
	September 28, 2013	$	95,938	$	—		$	96,138	$	—		$	96,138
	December 31, 2012	$	139,563	$	—		$	139,563	$	—		$	139,563
	3.00% Senior Convertible Notes
	September 28, 2013	$	165,390	$	—		$	282,659	$	—		$	282,659
	December 31, 2012	$	157,440	$	—		$	157,300	$	—		$	157,300
	Certain assets have been measured at fair value on a nonrecurring basis using significant unobservable inputs (Level 3). The following table presents nonrecurring fair value measurements recognized for the nine-month period ended September 28, 2013 and for the nine-month period ended December 31, 2012
		September 28, 2013					December 31, 2012
		Fair Value		Total Losses			Fair Value		Total Losses
	Long-lived asset group at our Hazelwood facility	$	1,155	$	4,010		$	5,165	$	29,261
	For Level 3 assets that were measured at fair value on a non-recurring basis during the nine-month period ended September 28, 2013, the following table presents the fair value of those assets as of the measurement date, valuation techniques and related unobservable inputs of those assets:
		Fair Value		Valuation Technique(s)		Unobservable		Range, Median
						Input		or Average
	Long-lived asset group at our Hazelwood facility	$	1,155	Cost Approach and Market Approach		Depreciation factors		Average of 75%
	The fair value of the long-lived asset group of the Hazelwood facility at December 31, 2012 was calculated based on a probability assessment of potential outcomes. An estimation of fair value, assuming the assets would be used by a market participant as is, was determined using a cost approach which was based on current replacement and/or reproduction costs of the asset as new, less depreciation factors attributable to physical, functional and economic obsolescence and utilizing data from various indexes. A separate estimate of fair value was determined using a market approach assuming an orderly liquidation. At December 31, 2012, equal weighting was applied to the cost and market approaches, however, due to a lack of interest by market participants, the Company’s fair value as of September 28, 2013 of $1,155 is primarily based on expected value upon liquidation.
	Significant changes in any of the significant unobservable inputs used could result in significantly higher or lower fair value measurements.

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 28, 2013
Goodwill and Other Intangible Assets	'
Goodwill and Other Intangible Assets	'
	6. Goodwill and Other Intangible Assets
	The following table contains the change in the Company’s goodwill during the nine months ended September 28, 2013:
		Photovoltaic			Sapphire
		Business			Business			Total
	Balance as of December 31, 2012
	Goodwill	$	61,399		$	43,659		$	105,058
	Accumulated impairment losses	(57,037		)	—			(57,037		)
		$	4,362		$	43,659		$	48,021
	Acquisition of Thermal Technology, LLC	—			6,744			6,744
	Balance as of September 28, 2013
	Goodwill	$	61,399		$	50,403		$	111,802
	Accumulated impairment losses	(57,037		)	—			(57,037		)
		$	4,362		$	50,403		$	54,765
	As noted in Note 4, during the three months ended March 30, 2013, the Company updated the preliminary valuation of assets acquired of Twin Creeks, which resulted in an increase to goodwill of $2,000 and a decrease to deferred tax assets of $2,000.  This adjustment was retrospectively recorded as of December 31, 2012 in the balance sheet and table above.
	No impairment losses have been recorded on the Company’s goodwill during the nine months ended September 28, 2013.
	Acquired intangible assets subject to amortization at September 28, 2013 and December 31, 2012 consisted of the following:
		Weighted
		Average		September 28, 2013								December 31, 2012
		Amortization		Gross			Accumulated					Gross		Accumulated
		Period		Amount			Amortization			Net		Amount		Amortization		Net
	Finite-lived intangible assets
	Photovoltaic:
	Technology	9.5 years		$	74,200		$	19,977		$	54,223	$	72,200	$	14,951	$	57,249
	Trade names / Trademarks	8.6 years		7,100			3,388			3,712		7,100		3,036		4,064
	Subtotal:			81,300			23,365			57,935		79,300		17,987		61,313
	Polysilicon:
	Technology	2.6 years		1,500			1,500			—		1,500		1,500		—
	Subtotal:			1,500			1,500			—		1,500		1,500		—
	Sapphire:
	Customer relationships	6.4 years		7,300			2,331			4,969		4,100		1,651		2,449
	Technology	9.3 years		28,600			5,983			22,617		17,300		4,181		13,119
	Order backlog	1.2 years		500			500			—		500		500		—
	Trade names	8.0 years		1,100			435			665		1,100		332		768
	Non-compete agreements	5.8 years		1,000			568			432		1,000		433		567
	Subtotal:			38,500			9,817			28,683		24,000		7,097		16,903
	Total finite-lived intangible assets			121,300			34,682			86,618		104,800		26,584		78,216
	Indefinite-lived intangible assets
	In-process research and development			12,300			—			12,300		12,300		—		12,300
	Total intangible assets			$	133,600		$	34,682		$	98,918	$	117,100	$	26,584	$	90,516
	The weighted average remaining amortization periods for the (i) photovoltaic, (ii) polysilicon and (iii) sapphire intangibles were 7.09 years, 0 years and 6.44 years, respectively, as of September 28, 2013. As of September 28, 2013, the estimated future amortization expense for the Company’s intangible assets is as follows:
	Year Ending December 31,	Amortization
		Expense
	2013 (remaining three months)	$	2,975
	2014	11,881
	2015	11,852
	2016	11,519
	2017	11,052
	2018	10,990
	Thereafter	38,649

Customer_Concentrations

Customer Concentrations

9 Months Ended

Sep. 28, 2013

Customer Concentrations

'

Customer Concentrations

'

7. Customer Concentrations

The following customers comprised 10% or more of the Company’s total revenue or accounts receivable for the, or as of, the periods indicated:

Three Months Ended

Nine Months Ended

As of

September 28, 2013

September 29, 2012

September 28, 2013

September 29, 2012

September 28, 2013

December 31, 2012

% of

% of

% of

% of

Accounts

% of

Accounts

% of

Revenue

Total

Revenue

Total

Revenue

Total

Revenue

Total

Receivable

Total

Receivable

Total

Photovoltaic Customers

Customer #1

*

*

*

*

*

*

*

*

*

*

$

2,478

10

%

Polysilicon Customers

Customer #2

$

17,600

44

%

*

*

*

*

*

*

*

*

*

*

Customer #3

7,919

20

%

*

*

$

108,579

41

%

*

*

*

*

*

*

Customer #4

*

*

*

*

45,268

17

%

*

*

*

*

9,085

38

%

Customer #5

*

*

*

*

34,915

13

%

*

*

*

*

*

*

Customer #6 (1)

*

*

$

43,459

39

%

*

*

$

139,337

22

%

*

*

*

*

Customer #7

*

*

39,142

36

%

*

*

*

*

$

1,200

16

%

3,248

14

%

Customer #8

*

*

*

*

*

*

82,316

13

%

*

*

*

*

Customer #9

*

*

*

*

*

*

77,870

12

%

*

*

*

*

Customer #10

*

*

*

*

*

*

*

*

1,450

19

%

*

*

Sapphire Customers

Customer #11

*

*

*

*

*

*

63,950

10

%

*

*

*

*

*                      Amounts from these customers were less than 10% of the total as of, or for, the respective period.

(1)                   Presented in the table are revenues from a significant customer in the Polysilicon segment.  Total revenue recognized from this customer for the three months ended September 29, 2012 was $43,769 or 40% of total revenue.  Total revenue recognized from this customer for the nine months ended September 29, 2012 was $174,127 or 28% of total revenue. Not included in the table above for the three and nine months ended September 29, 2012 are $310 or less than 1% and $34,790 or 6% of total revenue for these periods for sales to this customer that have been included in the Sapphire segment.

The Company requires most of its customers to either post letters of credit and/or make advance payments of a portion of the selling price prior to delivery. Approximately $3,174 (or 42%) and $16,557 (or 69%) of total accounts receivable as of September 28, 2013 and December 31, 2012, respectively, were secured by letters of credit.

Derivative_and_Hedging_Activit

Derivative and Hedging Activities

9 Months Ended

Sep. 28, 2013

Derivative and Hedging Activities

'

Derivative and Hedging Activities

'

8. Derivative and Hedging Activities

The Company enters into forward foreign currency exchange contracts to hedge portions of foreign currency denominated inventory purchases. These contracts typically expire within 12 months of entering into the contract. As of September 28, 2013, the Company had no open forward foreign currency exchange contracts.

The following table sets forth the balance sheet locations and fair value of the Company’s forward foreign currency exchange contracts at December 31, 2012:

Instruments Designated as Cash Flow Hedges

Balance Sheet

December 31, 2012

Location

Forward foreign currency exchange contracts—assets

Prepaid expenses and other current assets

$

230

The following table sets forth the effect of the Company’s forward foreign currency exchange contracts designated as hedging instruments on the condensed consolidated statements of operations for the three and nine months ended September 28, 2013 and September 29, 2012:

Instruments Designated as Cash Flow Hedges

Amount of

Location of Gain or

Amount of Gain or

Location of

(Gain) or Loss

(Loss) Reclassified

(Loss) Reclassified

Gain or (Loss)

Amount of Gain or

Recognized in OCI

from AOCI

from AOCI

Recognized in

(Loss) Recognized in

on Derivative

into Income

into Income

Income on Derivative

Income on Derivative

(Effective Portion)

(Effective Portion)

(Effective Portion)

(Ineffective Portion)

(Ineffective Portion)

Three Months Ended

September 28, 2013

$

—

Cost of revenue

$

—

Other, net

$

—

September 29, 2012

173

Cost of revenue

(498

)

Other, net

—

Nine Months Ended

September 28, 2013

4

Cost of revenue

60

Other, net

—

September 29, 2012

641

Cost of revenue

(2,775

)

Other, net

—

Derivatives Not Designated as Hedging Instruments

Location of

Gain or (Loss)

Amount of Gain or

Recognized in

(Loss) Recognized in

Income on Derivative

Income on Derivative

Three Months Ended

September 28, 2013

Other, net

$

—

September 29, 2012

Other, net

(287

)

Nine Months Ended

September 28, 2013

Other, net

$

—

September 29, 2012

Other, net

(886

)

During the nine months ended September 28, 2013, there were no losses reclassified into earnings as a result of the Company discontinuing cash flow hedging. No amount of accumulated gain included in other comprehensive income as of September 28, 2013 is expected to be reclassified into earnings over the next twelve months.

Inventories

Inventories	9 Months Ended
	Sep. 28, 2013
Inventories	'
Inventories	'
	9. Inventories
	Inventories consisted of the following:
		September 28, 2013		December 31, 2012
	Raw materials	$	109,137	$	97,957
	Work-in-process	8,563		5,100
	Finished goods	5,489		30,229
		$	123,189	$	133,286

Other_Assets

Other Assets	9 Months Ended
	Sep. 28, 2013
Other Assets	'
Other Assets	'
	10. Other Assets
	Other assets consisted of the following:
		September 28, 2013		December 31, 2012
	Inventory	$	36,724	$	33,834
	Vendor advances	18,524		20,664
	Deferred financing fees	7,945		8,787
	Deferred income taxes	21,222		15,424
	Other	7,666		8,211
		$	92,081	$	86,920

Warranty

Warranty	9 Months Ended
	Sep. 28, 2013
Warranty	'
Warranty	'
	11. Warranty
	The following table presents warranty activities:
		Nine Months Ended
		September 28, 2013			September 29, 2012
	Product warranty liability, beginning of the period	$	10,711		$	4,764
	Accruals for warranties issued	7,157			9,029
	Payments under warranty	(5,500		)	(4,578		)
	Product warranty liability, end of period	$	12,368		$	9,215

Restructuring_Charges_and_Asse

Restructuring Charges and Asset Impairments	9 Months Ended
	Sep. 28, 2013
Restructuring Charges and Asset Impairments	'
Restructuring Charges and Asset Impairments	'
	12. Restructuring Charges and Asset Impairments
	October 2012 Restructuring
	As part of a program to reduce costs and increase operational efficiencies, the Company announced, on October 31, 2012, a plan to streamline worldwide operations to better align its cost structure with market conditions by reducing its global workforce and closing or consolidating certain facilities. In the nine months ended September 28, 2013 the Company recorded $362 of severance related expense, of which $145, $159, $14 and $44 related to the corporate, PV, polysilicon and sapphire segments, respectively.
	Hazelwood Facility Idling
	On January 10, 2013, the Company announced its plan to idle operations at its Hazelwood, Missouri facility (“Hazelwood facility”). The idling of the Hazelwood facility is part of the Company’s effort to reduce costs and optimize its research and development activities and the idling of the facility was completed by March 30, 2013. In connection with this action, the Company terminated the employment of 37 of the Hazelwood facility employees at various dates in the first quarter of fiscal 2013. The Company determined that as of December 31, 2012 it was probable that employees would be entitled to receive severance and related benefits and that these amounts were estimable and accordingly recorded the expense during the three months ended December 31, 2012. In connection with the idling of the Hazelwood facility, the Company recorded $29,782 of restructuring and asset impairment expense during the three months ended December 31, 2012 to the PV segment, comprised of $521 of severance and related benefits and $29,261 for the write-down to fair value of certain long-lived, intangible assets and other assets associated with the Hazelwood facility. During the three months ended September 28, 2013, the Company recorded $4,010 of additional asset impairment expense related to the certain long-lived intangible assets and other assets noted above. At December 31, 2012, equal weighting was applied to the cost and market approaches, however, due to a lack of interest by market participants, the Company’s fair value as of September 28, 2013 of $1,155 is primarily based on expected value upon liquidation. During the nine months ended September 28, 2013, the Company recorded $1,854 of additional charges related to the Hazelwood facility’s lease exit costs, $642 of other contract termination costs related to this facility and $4,010 of impairment charges related to the fair value of the HiCz fixed assets, respectively. The Company has determined the long-lived asset group of the Hazelwood facility, which has a carrying value of $1,155, does not meet the held-for-sale criteria at September 28, 2013.
	The Company reports expense for its restructuring charges and asset impairments separately in the condensed consolidated statements of operations. The restructuring charges and remaining accrued expenses, which are included in accrued expenses on the Company’s condensed consolidated balance sheet as of September 28, 2013 are as follows:
		Employee Related			Lease Exit and Contract			Asset Impairments			Total
		Benefits			Termination Costs
	Balance as of December 31, 2012	$	2,076		$	133		$	—		$	2,209
	Charges	362			2,496			4,010			6,868
	Cash payments	(2,044		)	(1,065		)	—			(3,109		)
	Asset impairments	—			—			(4,010		)	(4,010		)
	Balance as of September 28, 2013	$	394		$	1,564		$	—		$	1,958

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 28, 2013
Income Taxes	'
Income Taxes	'
	13. Income Taxes
	The Company has concluded that the effective tax rate for the year is no longer sensitive to the projected ordinary income for the year given that small fluctuations in profits do have a material impact on the effective tax rate. As a result and in accordance with authoritative guidance for accounting for income taxes in interim periods, the Company has computed its provision using its estimated annual effective tax rate which takes into account operations in the U.S. and in other tax jurisdictions. Changes in the mix of income recognized between the U.S. and foreign tax jurisdictions impacts the Company’s effective tax rate. Any discrete tax adjustments are recorded in the specific quarter they arise.
	The Company’s effective tax rate for the three and nine months ended September 28, 2013 and September 29, 2012, was 10.1% and 26.9%, and 24.2% and 32%, respectively. The effective rate differs from the U.S. federal statutory rate due to a favorable permanent adjustment related to contingent consideration which is non-includable for tax purposes and the jurisdictional mix of income/loss. The Company incurred proportionally larger losses in the U.S., a higher tax jurisdiction than in lower tax jurisdictions, namely Hong Kong.
	A reconciliation of the change in unrecognized tax benefits for the nine months ended September 28, 2013 is as follows:
	Unrecognized tax benefits at December 31, 2012	$	26,322
	Increases related to current year tax positions	272
	Increases related to prior year tax positions	372
	Settlements with tax authorities	(1,464		)
	Unrecognized tax benefits at September 28, 2013	$	25,502
	The Company also recognizes interest and penalties related to unrecognized tax benefits as a component of income tax expense. During the three and nine month period ending September 28, 2013, the Company recorded an income tax provision of $277 and $355, respectively, related to interest and penalty accruals.
	The Company files income tax returns in the U.S. federal jurisdiction and various state and foreign jurisdictions. The Company is subject to examination by federal, state, and foreign tax authorities. The Company’s U.S. tax returns have been settled through fiscal years ending March 31, 2008. The Company continues to be under examination by the Internal Revenue Service, or IRS for its fiscal years ending March 28, 2009 and April 3, 2010. In addition, the statute of limitations is open for all state and foreign jurisdictions.  During the nine months ended September 28, 2013 and September 29, 2012, the Company paid $16,109 and $51,079 for estimated taxes, respectively.
	In September 2013, the U.S. Department of the Treasury and the Internal Revenue Service released final regulations relating to guidance on applying tax rules to amounts paid to acquire, produce or improve tangible personal property as well as rules for materials and supplies. These regulations are effective for tax years beginning on or after January 1, 2014, with early adoption permitted. Transition guidance providing the procedural rules to comply with such regulations is expected to be released in the near term. The Company is currently assessing these rules, but does not believe there will be a material impact on the condensed consolidated financial statements when they are adopted.

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 28, 2013
Commitments and Contingencies	'
Commitments and Contingencies	'
	14. Commitments and Contingencies
	Purchase Commitments
	The Company’s commitments to purchase raw materials, research and development and other services from various suppliers and vendors are estimated to be $329,147 and $214,611 as of September 28, 2013 and December 31, 2012, respectively. The majority of these commitments as of September 28, 2013 are due within the next twelve months.
	As a result of the factors outlined under the “Recent Developments” in Note 1 above, the Company expects to terminate purchase commitments with vendors for DSS inventory components in fiscal 2013 and beyond. These purchase contracts generally require a payment to the vendors to reimburse them for costs incurred, if any, through the termination date. No amount has been accrued as of September 28, 2013, as these purchase orders have not been terminated at September 28, 2013. The gross amount of remaining purchases under these purchase orders was $14,284 as of September 28, 2013, and the Company may negotiate with the vendors to determine the amount payable upon termination of these purchase orders.
	Litigation Contingencies
	The Company is subject to various routine legal proceedings and claims incidental to its business which management believes will not have a material effect on the Company’s financial position, results of operations or cash flows.
	In October 2013, the Company settled a vendor contract dispute. The terms of the settlement, which includes no admission of liability or wrongdoing by the Company or by any other defendants, provides for a full and complete release of all claims that were or could have been brought against the Company. The Company paid $3,250 in the fourth quarter to settle this matter. The Company has recorded this expense in general and administrative expense during the three months ended September 28, 2013.
	Customer Indemnifications
	In certain cases, the Company indemnifies, under pre-determined conditions and limitations, its customers for infringement of third-party intellectual property rights by the Company’s products or services (and, in limited instances, the Company also indemnifies other third parties for certain potential damages). The Company generally seeks to limit its liability for such indemnity to an amount not to exceed the sales price of the products or services (or the price paid for products or services) subject to its indemnification obligations, but not all agreements contain such limitations on liability. The Company does not believe, based on information available, that it is probable that any material amounts will be paid under these indemnification provisions.

LongTerm_Debt_and_Convertible_

Long-Term Debt and Convertible Notes	9 Months Ended
	Sep. 28, 2013
Long-Term Debt and Convertible Notes	'
Long-Term Debt and Convertible Notes	'
	15. Long-Term Debt and Convertible Notes
	Bank of America Credit Agreement
	On January 31, 2012, the Company, its principal U.S. operating subsidiary (the “U.S. Borrower”) and its Hong Kong subsidiary (the “Hong Kong Borrower”) entered into a credit agreement (the “2012 Credit Agreement”), with Bank of America, N.A., as administrative agent, Swing Line Lender and L/C Issuer (or “Bank of America”) and the lenders from time to time party thereto. The 2012 Credit Agreement consists of a term loan facility (the “2012 Term Facility”) provided to the U.S. Borrower in an aggregate principal amount of $75,000 with a final maturity date of January 31, 2016, a revolving credit facility (the “U.S. Revolving Credit Facility”) available to the U.S. Borrower in an aggregate principal amount of $25,000 with a final maturity date of January 31, 2016 (this revolving facility is no longer available pursuant to the 2013 Amendment) and a revolving credit facility (the “Hong Kong Revolving Credit Facility”; together with the U.S. Revolving Credit Facility, the “2012 Revolving Credit Facility”; and together with the 2012 Term Facility, the “2012 Credit Facilities”) available to the Hong Kong Borrower in an aggregate principal amount of $150,000 (which was reduced to $125,000 pursuant to the 2013 Amendment) with a final maturity date of January 31, 2016.
	On various dates between June 15, 2012 and June 25, 2012, the Company, the U.S. Borrower and the Hong Kong Borrower requested and received approval for increases in the 2012 Term Facility for the U.S. Borrower in an aggregate amount equal to $70,000 (the “Incremental Term Loans”) pursuant to the 2012 Credit Agreement.
	As a result of the Incremental Term Loans, the aggregate term loan under the 2012 Credit Agreement was increased from $75,000 to $145,000, all of which was borrowed by the U.S. Borrower. The Company pre-paid $40,000 of the 2012 Term Facility pursuant to the 2013 Amendment which payment did not reduce the amortization of the Term Loan.
	All of the material terms and conditions related to the Incremental Term Loans were identical to the terms and conditions that apply to the 2012 Term Facility, including the final maturity date of January 31, 2016 and the interest rate. The Incremental Term Loans amortize over the same period, and in proportional amounts, as the 2012 Term Facility, commencing with the first amortization payment under both term facilities in June 2012.
	On October 30, 2013, the Company terminated the 2012 Credit Agreement (the “Credit Agreement”).  As of September 28, 2013, there was approximately $96,000 outstanding borrowings under the 2012 Term Facility, which was paid in full on October 30, 2013 by using available cash.  As of October 30, 2013, there are no amounts outstanding under the 2012 Revolving Credit Facility and no outstanding stand-by letters of credit under the 2012 Revolving Credit Facility.  In connection with the termination of the 2012 Credit Agreement, the Company expects to recognize a charge in the fourth quarter of approximately $3,639 relating to deferred issuance costs that will be written off upon the termination of the agreement.  For additional information, refer to Note 21, Subsequent Events.
	Interest expense related to 2012 Term Facility and 2012 Revolving Credit Facility was $1,859 and $6,839 for the three and nine month periods ended September 28, 2013, respectively, and $1,470 and $3,185 for the three and nine month periods ended September 29, 2012, respectively, which includes amortization of debt fees related to both facilities, as well as the associated commitment fees. The weighted average interest rates for the three and nine month periods ended September 28, 2013 was 4.69% and 4.25%, respectively. There was no interest capitalized on construction-in-process contracts for the three or nine-months ended September 28, 2013. The balance of deferred financing costs at September 28, 2013 was $3,639 and is included in other assets on the condensed consolidated balance sheet.
	The Company used amounts available under the Hong Kong Revolving Credit Facility in connection with standby letters of credit related to customer deposits. As of September 28, 2013, the Company had $539 of outstanding letters of credit pursuant to the Hong Kong Revolving Credit Facility resulting in $124,461 of available credit under the Hong Kong Revolving Credit Facility.
	3.00% Convertible Senior Notes due 2017
	On September 28, 2012, the Company issued $220,000 aggregate principal amount of 3.00% Convertible Senior Notes due 2017 (the “Notes”). The net proceeds from the issuance of the Notes were approximately $212,592, after deducting fees paid to the initial purchasers and other offering costs. The Notes are senior unsecured obligations of the Company, which pay interest in cash semi-annually (on April 1 and October 1 of each year) at a rate of 3.00% per annum beginning on April 1, 2013. The Notes are governed by an Indenture dated September 28, 2012 with U.S. Bank National Association, as trustee (the “Indenture”). The Notes are not redeemable by the Company.
	The Notes will mature on October 1, 2017, unless earlier repurchased or converted in accordance with their terms prior to such date. The Notes may be converted, under certain conditions, based on an initial conversion rate of 129.7185 shares of common stock per $1,000 principal amount of Notes (approximately 28.5 million shares) (which represents an initial effective conversion price of the Notes of $7.71 per share), subject to adjustment as described in the Indenture.
	The effective interest rate on the liability component of the Notes was 10.7% as of September 28, 2013. Interest expense incurred in connection with the Notes consisted of the following:
		Three Months Ended			Nine Months Ended
		September 28, 2013			September 28, 2013
	Contractual coupon rate of interest	$	1,659		$	4,969
	Discount amortization	3,158			8,633
	Interest expense - Convertible Notes	$	4,817		$	13,602
	The carrying value of our Notes consisted of the following:
		September 28, 2013
	Principal balance	$	220,000
	Discount, net of accumulated amortization of $10,506	(54,610		)
	Carrying amount	$	165,390
	The Company will be required to repay the following principal amounts under the 2012 Term Facility, Incremental Term Loans and Notes:
		Principal
	Fiscal Year Ending	Payments
	2013 (remaining 3 months)	$	3,625
	2014	12,688
	2015	14,500
	2016	65,125
	2017	220,000
	Total	$	315,938
	On October 30, 2013, the principal amounts due in the fiscal years ending 2013, 2014, 2015 and 2016 were paid in full using available cash. For additional information, refer to Note 21, Subsequent Events.

ShareBased_Compensation

Share-Based Compensation	9 Months Ended
	Sep. 28, 2013
Share-Based Compensation	'
Share-Based Compensation	'
	16. Share-Based Compensation
	The Company recorded $4,555, $13,883, $4,818, and $13,091 of expense related to share-based compensation during the three and nine months ended September 28, 2013 and September 29, 2012, respectively. Share-based compensation cost capitalized as part of inventory was not material for all periods presented.
	During the nine months ended September 28, 2013, no option awards were granted.
	During the nine months ended September 28, 2013, the Company granted restricted stock units to certain executives, employees and directors of the Company for 3,158 shares of the Company’s common stock. Restricted stock units provide for the holder to receive shares of the Company’s common stock at the time such units vest or restrictions on such units lapse in accordance with the terms of the restricted stock unit agreement. The total fair value of the restricted stock units, which was based on the fair value of the Company’s common stock on the date of grant, was $10,771 or $3.41 per share on a weighted average basis.
	During the nine months ended September 28, 2013, the Company granted certain executives 890 market based restricted stock units which are earned based upon achievement of certain stock price thresholds (and if these price thresholds are satisfied, the units vest upon meeting certain continued service requirements).  The total fair value of these market-based restricted stock units was determined through the use of a Monte Carlo simulation model, which utilizes multiple input variables that determine the probability of satisfying the market condition requirements applicable to each award; these inputs include the expected volatility factor, risk free interest rate, expected term (in years) and expected dividend yield. The total fair value of these restricted stock units was $2,688, or $3.02 per share on a weighted average basis.
	As of September 28, 2013, the Company had unamortized share-based compensation expense related to stock options, restricted stock unit awards, market-based restricted stock unit awards and performance-based restricted stock unit awards of approximately $23,516 after estimated forfeitures. The remaining unamortized share-based compensation expense related to stock options, restricted stock unit awards and performance and market-based restricted stock unit awards will be recognized over an estimated weighted average remaining requisite service period of 1.69 years.

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 28, 2013
Stockholders' Equity	'
Stockholders' Equity	'
	17. Stockholders’ Equity
	The following table presents the changes in stockholders’ equity for the nine months ended September 28, 2013:
		Common Stock					Additional			Retained			Accumulated Other		Total
							Paid-in								Stockholders’
		Shares		Par Value			Capital			Earnings			Comprehensive Income		Equity
	Balance as of January 1, 2013	119,293		$	1,193		$	183,565		$	56,687		$	806	$	242,251
	Net loss	—		—			—			(44,880		)	—		(44,880		)
	Other comprehensive income	—		—			—			—			260		260
	Common stock issued for Thermal Tech acquisition (net of $46 of registration costs)	3,356		33			14,384			—			—		14,417
	Option exercises and vesting of restricted stock units	1,448		14			101			—			—		115
	Share-based compensation expense	—		—			13,490			—			—		13,490
	Excess tax deficiency from share-based award activity	—		—			(1,396		)	—			—		(1,396		)
	Minimum tax withholding payments for employee share-based awards	(339	)	(3		)	(1,513		)	—			—		(1,516		)
	Balance as of September 28, 2013	123,758		$	1,237		$	208,631		$	11,807		$	1,066	$	222,741

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 28, 2013
Accumulated Other Comprehensive Income	'
Accumulated Other Comprehensive Income	'
	18. Accumulated Other Comprehensive Income
	The changes in accumulated other comprehensive income by component, net of tax, for the three and nine months ended September 28, 2013 are as follows:
		Unrealized Gains and Losses on Cash			Foreign Currency Items		Total
		Flow Hedges
	Beginning balance as of June 29, 2013	$	(591	)	$	1,591	$	1,000
	Other comprehensive income (loss) before reclassifications				66		66
	Amounts reclassified from accumulated other comprehensive income	—			—		—
	Net other comprehensive income	$	—		$	66	66
	Balance as of September 28, 2013	$	(591	)	$	1,657	$	1,066
		Unrealized Gains and Losses on Cash			Foreign Currency Items		Total
		Flow Hedges
	Beginning balance as of January 1, 2013	$	(537	)	$	1,343	$	806
	Other comprehensive income (loss) before reclassifications	(3		)	314		311
	Amounts reclassified from accumulated other comprehensive income	(51		)	—		(51		)
	Net other comprehensive income	$	(54	)	$	314	260
	Balance as of September 28, 2013	$	(591	)	$	1,657	$	1,066
	There were no amounts reclassified out of accumulated other comprehensive income for the three months ended September 28, 2013. The reclassification out of accumulated other comprehensive income for the nine months ended September 28, 2013 was ($51). Such reclassifications impacted cost of revenue within the Company’s condensed consolidated statement of operations.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 28, 2013
Earnings Per Share	'
Earnings Per Share	'
	19. Earnings Per Share
	Basic earnings (loss) per share is computed by dividing the Company’s earnings (loss) by only the weighted average number of common shares outstanding during the period. For a period in which the Company reports net income, diluted earnings per share is computed by dividing the Company’s earnings by the weighted average number of common shares and, when dilutive, the weighted average number of potential common shares outstanding during the period, as determined using the treasury stock method. Potential common shares consist of common stock issuable upon the exercise of outstanding stock options and the vesting of restricted stock units.
	The following table sets forth the computation of the weighted average shares used in computing basic and diluted earnings per share:
		Three Months Ended		Nine Months Ended
		September 28, 2013	September 29, 2012	September 28, 2013	September 29, 2012
	Weighted average common shares—basic	122,183	118,769	119,752	118,873
	Dilutive common stock options and restricted stock unit awards (1) (2) (3)	—	1,105	—	1,253
	Weighted average common and common equivalent shares—diluted	122,183	119,874	119,752	120,126
	(1) Holders of the Notes may convert the Notes into shares of the Company’s common stock, at the applicable conversion rate, subject to certain conditions. Since it is the Company’s stated intent to settle the principal amount of the Notes in cash, the Company has used the treasury stock method for determining the potential dilution in the diluted earnings per share computation. Since the average price of the Company’s common stock was less than the effective conversion price for such Notes during the reporting periods, the Notes were not dilutive for such periods.
	(2) Upon exercise of outstanding Warrants, holders of the Warrants may acquire up to 28,500 shares of the Company’s common stock at an exercise price of $9.9328. If the market price per share of the Company’s common stock for the period exceeds the established strike price, the Warrants will have a dilutive effect on its diluted net income per share using the treasury-stock-type method.  Since the average price of the Company’s common stock was less than the strike price of the warrants for the reporting periods, such Warrants were also not dilutive.
	(3) As the Company was in a loss position for the three and nine months ended September 28, 2013, certain shares have not been included in the calculation of earnings per share, as their impact would be anti-dilutive. The total number of shares excluded from the calculation of earnings per share because they would be anti-dilutive was 11,584 and 11,463 for the three and nine months ended September 28, 2013, respectively. In addition, for the three and nine months ended September 29, 2012, the total number of shares excluded from the calculation of earnings per share because they would be anti-dilutive was 3,739 and 2,961 shares, respectively.
	As shares have been placed in escrow for any indemnifications and liabilities in connection with the acquisition of substantially all of the business of Thermal Technology, LLC, these shares have not been included in the calculation of basic earnings per share. Upon the resolution of any contingencies and indemnifications, which will be with the associated release of the shares from escrow, such shares will be included in basic earnings per share as calculated in the period the contingencies are resolved.

Segment_and_Geographical_Infor

Segment and Geographical Information	9 Months Ended
	Sep. 28, 2013
Segment and Geographical Information	'
Segment and Geographical Information	'
	20. Segment and Geographical Information
	Segment Information
	The Company reports its results in three segments: the PV business, the polysilicon business and the sapphire business. The Company evaluates performance and allocates resources based on revenues and gross margin of each segment. The Company defines segment gross margin as the cost of goods sold associated with segment revenues. Operating expenses are reviewed and evaluated at the consolidated level and are not allocated to the respective operating segments for purposes of allocating resources or evaluating performance of the business segment.
	The PV business manufactures and sells directional solidification, or DSS, crystallization furnaces and ancillary equipment used to cast crystalline silicon ingots by melting and cooling polysilicon in a precisely controlled process. These ingots are used to make photovoltaic wafers which are, in turn, used to make solar cells.
	The polysilicon business manufactures and sells Silicon Deposition Reactors (SDR™) and related equipment used to produce polysilicon, the key raw material used in silicon-based solar wafers and cells, while also providing engineering services and related equipment.
	The sapphire business manufactures and sells advanced sapphire crystal growth systems, as well as sapphire materials used in LED applications, and sapphire components used in other specialty markets. On May 16, 2013, the Company acquired substantially all of the business of Thermal Technology which are included in the sapphire segment. Thermal Technology is a developer and seller of a wide range of high temperature thermal and vacuum products used in the fabrication of advanced materials that have been deployed across multiple industries including LED, medical devices, oil and gas and automotive. The acquisition of Thermal Technology provides the Company with key technologies, in particular a sapphire annealing furnace product, that we believe will allow us to address potential new markets with production equipment options that can be optimized around customer’s specific needs.
	Financial information for the Company’s reportable segments is as follows:
		Three Months Ended						Nine Months Ended
		September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Revenue:
	PV	$	4,369		$	1,556		$	20,144		$	42,357
	Polysilicon	28,564			95,856			217,279			371,320
	Sapphire	7,358			12,649			28,974			217,526
	Total revenue	40,291			110,061			266,397			631,203
	Gross Profit:
	PV	$	2,893		$	(3,312	)	$	2,290		$	14,473
	Polysilicon	20,032			35,095			95,119			148,412
	Sapphire	(5,148		)	3,245			(7,401		)	84,677
	Total gross profit	17,777			35,028			90,008			247,562
	Research and development	21,075			18,767			56,039			47,954
	Sales and marketing	3,496			3,123			10,870			9,657
	General and administrative	17,427			15,428			48,507			45,731
	Contingent consideration expense (income)	4,971			(9,943		)	997			(9,261		)
	Restructuring charges	4,010			—			6,868			—
	Amortization of intangible assets	2,976			2,538			8,098			7,631
	Income (loss) from operations	(36,178		)	5,115			(41,371		)	145,850
	Interest income	122			27			286			50
	Interest expense	(6,456		)	(1,620		)	(20,462		)	(3,398		)
	Other, net	62			(431		)	73			(968		)
	Income (loss) before taxes	$	(42,450	)	$	3,091		$	(61,474	)	$	141,534
	Geographic Information
	The following table presents revenue by geographic region, which is based on the destination of the shipments:
		Three Months Ended						Nine Months Ended
		September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	China	$	8,969		$	14,038		$	39,652		$	267,001
	Korea	17,796			83,001			54,343			216,431
	Other Asia	9,334			9,191			161,349			134,829
	Europe	848			397			1,767			1,604
	United States	3,298			2,285			9,158			7,623
	Other	46			1,149			128			3,715
	Total	$	40,291		$	110,061		$	266,397		$	631,203
	A summary of long-lived assets by geographical region is as follows:
		September 28, 2013(1)			December 31, 2012(1)
	United States	$	158,202		$	150,738
	Luxembourg	59,646			63,024
	China	664			1,382
	Taiwan	84			121
	Hong Kong	842			1,252
	Total	$	219,438		$	216,517
	(1) Long-lived assets at September 28, 2013 and December 31, 2012, include intangible assets and goodwill of $153,683 and $138,537, respectively, all located in the United States, with the exception of $1,711 and $61,313 of goodwill and intangibles, respectively, at December 31, 2012, which are located in Luxembourg.  At September 28, 2013 the amounts of goodwill and intangibles that were not located in the United States, but in Luxembourg were $1,711 and $57,935, respectively.

Subsequent_Event

Subsequent Event	9 Months Ended
	Sep. 28, 2013
Subsequent Event	'
Subsequent Event	'
	21. Subsequent Event
	Agreements with Apple Inc.
	On October 31, 2013, GTAT Corporation (“GTAT”), a wholly-owned subsidiary of GT Advanced Technologies Inc, and Apple Inc. (“Apple”) entered into a Master Development and Supply Agreement and related Statement of Work (the “MDSA”), pursuant to which GTAT will supply sapphire material exclusively to Apple for consumer electronics.  GTAT has granted Apple certain intellectual property rights in connection with its sapphire growth technologies.
	On October 31, 2013, GTAT also entered into a Prepayment Agreement with Apple pursuant to which GTAT will receive approximately $578 million (the “Prepayment Amount”), in four separate installments, as payment in advance for the purchase of sapphire goods.  GTAT is required to repay this amount ratably over a five year period ending in January 2020, either as a credit against Apple purchases of sapphire goods under the MDSA or as a direct cash payment.  GTAT’s obligation to repay the Prepayment Amount may be accelerated under certain circumstances.  GTAT’s obligations under the Prepayment Agreement are secured by certain of its assets.  While the MDSA specifies GTAT’s minimum and maximum supply commitments, there are no minimum purchase requirements under the terms of the MDSA.
	Finally, on October 31, 2013, GTAT entered into a lease agreement (the “Lease Agreement”) with an affiliate of Apple in order to lease a facility in Mesa, Arizona that GTAT will use for the purpose of manufacturing the sapphire goods under the MDSA.
	The foregoing does not purport to be a complete description of the MDSA, the Prepayment Agreement or the Lease Agreement, which are filed with this Quarterly Report on Form 10-Q.
	Termination of Credit Agreement with Bank of America N.A.
	On October 30, 2013, GT Advanced Technologies Inc. terminated its credit agreement (the “Credit Agreement”), with Bank of America, N.A., (“Bank of America”) and the other lenders from time to time party thereto.  As of September 28, 2013, there was approximately $96 million outstanding under the term loan component of the Credit Agreement, which was paid in full on October 30, 2013 by the Company using its available cash.  As of October 30, 2013, there were no amounts outstanding under the revolving loan component of the Credit Agreement and no outstanding stand-by letters of credit under the Credit Agreement.

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 28, 2013
Basis of Presentation	'
Reclassifications	'
	Reclassifications
	Certain reclassifications have been made to prior year financial statements to conform to the current year presentation. Specifically, contingent consideration income of $9,943 and $9,261 for the three and nine-month periods ended September 29, 2012, respectively, was previously included in general and administrative expense, but is now stated separately in the Company’s condensed consolidated statements of operations.

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 28, 2013
Thermal Technology, LLC	'
Acquisitions	'
Summary of the purchase price allocation for the acquisition of privately-held company	'
	Fair value of consideration transferred:
	Common stock	$	14,463
	Contingent consideration obligations	6,211
	Preliminary estimate of net working capital adjustment	(735		)
	Total fair value of consideration	$	19,939
	Fair value of assets acquired and liabilities assumed:
	Accounts receivable	$	1,008
	Inventory	7,861
	Property, plant and equipment	1,700
	Deferred tax asset	411
	Other assets	439
	Intangible assets	14,500
	Goodwill	6,744
	Accounts payable and accrued expenses	(7,057		)
	Customer deposits	(2,509		)
	Deferred tax liability	(3,149		)
	Other current liabilities	(9		)
	Total net assets acquired	$	19,939
Twin Creeks Technologies, Inc.	'
Acquisitions	'
Summary of the purchase price allocation for the acquisition of privately-held company	'
	Fair value of consideration transferred:
	Cash	$	10,172
	Contingent consideration obligations	5,200
	Total fair value of consideration	$	15,372
	Fair value of assets acquired and liabilities assumed:
	Property, plant and equipment	$	1,529
	Other assets	23
	In-process research and development	12,300
	Goodwill	2,907
	Accounts payable	(1,362		)
	Other current liabilities	(25		)
	Total net assets acquired	$	15,372

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 28, 2013
Fair Value Measurements	'
Schedule of assets and liabilities measured and reported at fair value on a recurring basis	'
		September 28, 2013
		Total		Fair Value Measurements Using
		Carrying
		Value		(Level 1)			(Level 2)		(Level 3)
	Assets:
	Money market mutual funds	$	179,144	$	179,144		$	—	$	—
	Liabilities:
	Contingent consideration	$	17,523	$	—		$	—	$	17,523
		December 31, 2012
		Total		Fair Value Measurements Using
		Carrying
		Value		(Level 1)			(Level 2)		(Level 3)
	Assets:
	Money market mutual funds	$	200,041	$	200,041		$	—	$	—
	Forward foreign exchange contracts	230		—			230		—
	Liabilities:
	Contingent consideration	$	10,315	$	—		$	—	$	10,315
Schedule of changes in the fair value of the Company's Level 3 contingent consideration obligations	'
		Three Months Ended					Nine Months Ended
		September 28,		September 29,			September 28, 2013		September 29,
		2013		2012					2012
	Fair value as of the beginning of the period	$	12,552	$	14,762		$	10,315	$	23,713
	Acquisition date fair value of contingent consideration obligations related to acquisitions	—		—			6,211		—
	Changes in the fair value of contingent consideration obligations	4,971		(9,943		)	997		(9,261		)
	Payments of contingent consideration obligations	—		—			—		(9,633		)
	Fair value at the end of the period	$	17,523	$	4,819		$	17,523	$	4,819
Schedule of carrying and fair values of long-term debt obligations	'
				Fair Value Measurements Using
	Description	Total Carrying Value		(Level 1)			(Level 2)		(Level 3)			Fair Value
	2012 Term Facility, including current portion
	September 28, 2013	$	95,938	$	—		$	96,138	$	—		$	96,138
	December 31, 2012	$	139,563	$	—		$	139,563	$	—		$	139,563
	3.00% Senior Convertible Notes
	September 28, 2013	$	165,390	$	—		$	282,659	$	—		$	282,659
	December 31, 2012	$	157,440	$	—		$	157,300	$	—		$	157,300
Schedule of fair value of certain assets on a nonrecurring basis using significant unobservable inputs (Level 3)	'
		September 28, 2013					December 31, 2012
		Fair Value		Total Losses			Fair Value		Total Losses
	Long-lived asset group at our Hazelwood facility	$	1,155	$	4,010		$	5,165	$	29,261
Schedule of fair value of assets as of the measurements date, valuation techniques and related unobservable inputs	'
		Fair Value		Valuation Technique(s)		Unobservable		Range, Median
						Input		or Average
	Long-lived asset group at our Hazelwood facility	$	1,155	Cost Approach and Market Approach		Depreciation factors		Average of 75%

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 28, 2013
Goodwill and Other Intangible Assets	'
Schedule of changes in the Company's goodwill	'
		Photovoltaic			Sapphire
		Business			Business			Total
	Balance as of December 31, 2012
	Goodwill	$	61,399		$	43,659		$	105,058
	Accumulated impairment losses	(57,037		)	—			(57,037		)
		$	4,362		$	43,659		$	48,021
	Acquisition of Thermal Technology, LLC	—			6,744			6,744
	Balance as of September 28, 2013
	Goodwill	$	61,399		$	50,403		$	111,802
	Accumulated impairment losses	(57,037		)	—			(57,037		)
		$	4,362		$	50,403		$	54,765
Schedule of acquired intangible assets subject to amortization	'
		Weighted
		Average		September 28, 2013								December 31, 2012
		Amortization		Gross			Accumulated					Gross		Accumulated
		Period		Amount			Amortization			Net		Amount		Amortization		Net
	Finite-lived intangible assets
	Photovoltaic:
	Technology	9.5 years		$	74,200		$	19,977		$	54,223	$	72,200	$	14,951	$	57,249
	Trade names / Trademarks	8.6 years		7,100			3,388			3,712		7,100		3,036		4,064
	Subtotal:			81,300			23,365			57,935		79,300		17,987		61,313
	Polysilicon:
	Technology	2.6 years		1,500			1,500			—		1,500		1,500		—
	Subtotal:			1,500			1,500			—		1,500		1,500		—
	Sapphire:
	Customer relationships	6.4 years		7,300			2,331			4,969		4,100		1,651		2,449
	Technology	9.3 years		28,600			5,983			22,617		17,300		4,181		13,119
	Order backlog	1.2 years		500			500			—		500		500		—
	Trade names	8.0 years		1,100			435			665		1,100		332		768
	Non-compete agreements	5.8 years		1,000			568			432		1,000		433		567
	Subtotal:			38,500			9,817			28,683		24,000		7,097		16,903
	Total finite-lived intangible assets			121,300			34,682			86,618		104,800		26,584		78,216
	Indefinite-lived intangible assets
	In-process research and development			12,300			—			12,300		12,300		—		12,300
	Total intangible assets			$	133,600		$	34,682		$	98,918	$	117,100	$	26,584	$	90,516
Schedule of estimated future amortization expense for the Company's intangible assets	'
	Year Ending December 31,	Amortization
		Expense
	2013 (remaining three months)	$	2,975
	2014	11,881
	2015	11,852
	2016	11,519
	2017	11,052
	2018	10,990
	Thereafter	38,649

Customer_Concentrations_Tables

Customer Concentrations (Tables)

9 Months Ended

Sep. 28, 2013

Customer Concentrations

'

Schedule of customers comprising 10% or more of the Company's total revenue or accounts receivable

'

Three Months Ended

Nine Months Ended

As of

September 28, 2013

September 29, 2012

September 28, 2013

September 29, 2012

September 28, 2013

December 31, 2012

% of

% of

% of

% of

Accounts

% of

Accounts

% of

Revenue

Total

Revenue

Total

Revenue

Total

Revenue

Total

Receivable

Total

Receivable

Total

Photovoltaic Customers

Customer #1

*

*

*

*

*

*

*

*

*

*

$

2,478

10

%

Polysilicon Customers

Customer #2

$

17,600

44

%

*

*

*

*

*

*

*

*

*

*

Customer #3

7,919

20

%

*

*

$

108,579

41

%

*

*

*

*

*

*

Customer #4

*

*

*

*

45,268

17

%

*

*

*

*

9,085

38

%

Customer #5

*

*

*

*

34,915

13

%

*

*

*

*

*

*

Customer #6 (1)

*

*

$

43,459

39

%

*

*

$

139,337

22

%

*

*

*

*

Customer #7

*

*

39,142

36

%

*

*

*

*

$

1,200

16

%

3,248

14

%

Customer #8

*

*

*

*

*

*

82,316

13

%

*

*

*

*

Customer #9

*

*

*

*

*

*

77,870

12

%

*

*

*

*

Customer #10

*

*

*

*

*

*

*

*

1,450

19

%

*

*

Sapphire Customers

Customer #11

*

*

*

*

*

*

63,950

10

%

*

*

*

*

*                      Amounts from these customers were less than 10% of the total as of, or for, the respective period.

(1)                   Presented in the table are revenues from a significant customer in the Polysilicon segment.  Total revenue recognized from this customer for the three months ended September 29, 2012 was $43,769 or 40% of total revenue.  Total revenue recognized from this customer for the nine months ended September 29, 2012 was $174,127 or 28% of total revenue. Not included in the table above for the three and nine months ended September 29, 2012 are $310 or less than 1% and $34,790 or 6% of total revenue for these periods for sales to this customer that have been included in the Sapphire segment.

Derivative_and_Hedging_Activit1

Derivative and Hedging Activities (Tables)

9 Months Ended

Sep. 28, 2013

Derivative and Hedging Activities

'

Schedule of balance sheet locations and fair value of the Company's forward foreign currency exchange contracts

'

Balance Sheet

December 31, 2012

Location

Forward foreign currency exchange contracts—assets

Prepaid expenses and other current assets

$

230

Schedule of effect of the Company's forward foreign currency exchange contracts designated as hedging instruments on the condensed consolidated statement of operations

'

Instruments Designated as Cash Flow Hedges

Amount of

Location of Gain or

Amount of Gain or

Location of

(Gain) or Loss

(Loss) Reclassified

(Loss) Reclassified

Gain or (Loss)

Amount of Gain or

Recognized in OCI

from AOCI

from AOCI

Recognized in

(Loss) Recognized in

on Derivative

into Income

into Income

Income on Derivative

Income on Derivative

(Effective Portion)

(Effective Portion)

(Effective Portion)

(Ineffective Portion)

(Ineffective Portion)

Three Months Ended

September 28, 2013

$

—

Cost of revenue

$

—

Other, net

$

—

September 29, 2012

173

Cost of revenue

(498

)

Other, net

—

Nine Months Ended

September 28, 2013

4

Cost of revenue

60

Other, net

—

September 29, 2012

641

Cost of revenue

(2,775

)

Other, net

—

Derivatives Not Designated as Hedging Instruments

Location of

Gain or (Loss)

Amount of Gain or

Recognized in

(Loss) Recognized in

Income on Derivative

Income on Derivative

Three Months Ended

September 28, 2013

Other, net

$

—

September 29, 2012

Other, net

(287

)

Nine Months Ended

September 28, 2013

Other, net

$

—

September 29, 2012

Other, net

(886

)

Inventories_Tables

Inventories (Tables)	9 Months Ended
	Sep. 28, 2013
Inventories	'
Schedule of inventories	'
		September 28, 2013		December 31, 2012
	Raw materials	$	109,137	$	97,957
	Work-in-process	8,563		5,100
	Finished goods	5,489		30,229
		$	123,189	$	133,286

Other_Assets_Tables

Other Assets (Tables)	9 Months Ended
	Sep. 28, 2013
Other Assets	'
Schedule of other assets	'
		September 28, 2013		December 31, 2012
	Inventory	$	36,724	$	33,834
	Vendor advances	18,524		20,664
	Deferred financing fees	7,945		8,787
	Deferred income taxes	21,222		15,424
	Other	7,666		8,211
		$	92,081	$	86,920

Warranty_Tables

Warranty (Tables)	9 Months Ended
	Sep. 28, 2013
Warranty	'
Schedule of warranty activities	'
		Nine Months Ended
		September 28, 2013			September 29, 2012
	Product warranty liability, beginning of the period	$	10,711		$	4,764
	Accruals for warranties issued	7,157			9,029
	Payments under warranty	(5,500		)	(4,578		)
	Product warranty liability, end of period	$	12,368		$	9,215

Restructuring_Charges_and_Asse1

Restructuring Charges and Asset Impairments (Tables)	9 Months Ended
	Sep. 28, 2013
Restructuring Charges and Asset Impairments	'
Schedule of restructuring charges and remaining accrued expenses	'
		Employee Related			Lease Exit and Contract			Asset Impairments			Total
		Benefits			Termination Costs
	Balance as of December 31, 2012	$	2,076		$	133		$	—		$	2,209
	Charges	362			2,496			4,010			6,868
	Cash payments	(2,044		)	(1,065		)	—			(3,109		)
	Asset impairments	—			—			(4,010		)	(4,010		)
	Balance as of September 28, 2013	$	394		$	1,564		$	—		$	1,958

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 28, 2013
Income Taxes	'
Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits	'
	Unrecognized tax benefits at December 31, 2012	$	26,322
	Increases related to current year tax positions	272
	Increases related to prior year tax positions	372
	Settlements with tax authorities	(1,464		)
	Unrecognized tax benefits at September 28, 2013	$	25,502

LongTerm_Debt_and_Convertible_1

Long-Term Debt and Convertible Notes (Tables)	9 Months Ended
	Sep. 28, 2013
Long-Term Debt and Convertible Notes	'
Schedule of interest expense	'
		Three Months Ended			Nine Months Ended
		September 28, 2013			September 28, 2013
	Contractual coupon rate of interest	$	1,659		$	4,969
	Discount amortization	3,158			8,633
	Interest expense - Convertible Notes	$	4,817		$	13,602
Schedule of carrying value of the notes	'
		September 28, 2013
	Principal balance	$	220,000
	Discount, net of accumulated amortization of $10,506	(54,610		)
	Carrying amount	$	165,390
Schedule of repayment of principal amounts under the Term Facility	'
		Principal
	Fiscal Year Ending	Payments
	2013 (remaining 3 months)	$	3,625
	2014	12,688
	2015	14,500
	2016	65,125
	2017	220,000
	Total	$	315,938

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 28, 2013
Stockholders' Equity	'
Schedule of changes in stockholders' equity	'
		Common Stock					Additional			Retained			Accumulated Other		Total
							Paid-in								Stockholders’
		Shares		Par Value			Capital			Earnings			Comprehensive Income		Equity
	Balance as of January 1, 2013	119,293		$	1,193		$	183,565		$	56,687		$	806	$	242,251
	Net loss	—		—			—			(44,880		)	—		(44,880		)
	Other comprehensive income	—		—			—			—			260		260
	Common stock issued for Thermal Tech acquisition (net of $46 of registration costs)	3,356		33			14,384			—			—		14,417
	Option exercises and vesting of restricted stock units	1,448		14			101			—			—		115
	Share-based compensation expense	—		—			13,490			—			—		13,490
	Excess tax deficiency from share-based award activity	—		—			(1,396		)	—			—		(1,396		)
	Minimum tax withholding payments for employee share-based awards	(339	)	(3		)	(1,513		)	—			—		(1,516		)
	Balance as of September 28, 2013	123,758		$	1,237		$	208,631		$	11,807		$	1,066	$	222,741

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 28, 2013
Accumulated Other Comprehensive Income	'
Schedule of changes in accumulated other comprehensive income (loss) by component	'
		Unrealized Gains and Losses on Cash			Foreign Currency Items		Total
		Flow Hedges
	Beginning balance as of June 29, 2013	$	(591	)	$	1,591	$	1,000
	Other comprehensive income (loss) before reclassifications				66		66
	Amounts reclassified from accumulated other comprehensive income	—			—		—
	Net other comprehensive income	$	—		$	66	66
	Balance as of September 28, 2013	$	(591	)	$	1,657	$	1,066
		Unrealized Gains and Losses on Cash			Foreign Currency Items		Total
		Flow Hedges
	Beginning balance as of January 1, 2013	$	(537	)	$	1,343	$	806
	Other comprehensive income (loss) before reclassifications	(3		)	314		311
	Amounts reclassified from accumulated other comprehensive income	(51		)	—		(51		)
	Net other comprehensive income	$	(54	)	$	314	260
	Balance as of September 28, 2013	$	(591	)	$	1,657	$	1,066

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 28, 2013
Earnings Per Share	'
Schedule of computation of the weighted average shares used in computing basic and diluted earnings per share	'
		Three Months Ended		Nine Months Ended
		September 28, 2013	September 29, 2012	September 28, 2013	September 29, 2012
	Weighted average common shares—basic	122,183	118,769	119,752	118,873
	Dilutive common stock options and restricted stock unit awards (1) (2) (3)	—	1,105	—	1,253
	Weighted average common and common equivalent shares—diluted	122,183	119,874	119,752	120,126
	(1) Holders of the Notes may convert the Notes into shares of the Company’s common stock, at the applicable conversion rate, subject to certain conditions. Since it is the Company’s stated intent to settle the principal amount of the Notes in cash, the Company has used the treasury stock method for determining the potential dilution in the diluted earnings per share computation. Since the average price of the Company’s common stock was less than the effective conversion price for such Notes during the reporting periods, the Notes were not dilutive for such periods.
	(2) Upon exercise of outstanding Warrants, holders of the Warrants may acquire up to 28,500 shares of the Company’s common stock at an exercise price of $9.9328. If the market price per share of the Company’s common stock for the period exceeds the established strike price, the Warrants will have a dilutive effect on its diluted net income per share using the treasury-stock-type method.  Since the average price of the Company’s common stock was less than the strike price of the warrants for the reporting periods, such Warrants were also not dilutive.
	(3) As the Company was in a loss position for the three and nine months ended September 28, 2013, certain shares have not been included in the calculation of earnings per share, as their impact would be anti-dilutive. The total number of shares excluded from the calculation of earnings per share because they would be anti-dilutive was 11,584 and 11,463 for the three and nine months ended September 28, 2013, respectively. In addition, for the three and nine months ended September 29, 2012, the total number of shares excluded from the calculation of earnings per share because they would be anti-dilutive was 3,739 and 2,961 shares, respectively.

Segment_and_Geographical_Infor1

Segment and Geographical Information (Tables)	9 Months Ended
	Sep. 28, 2013
Segment and Geographical Information	'
Schedule of financial information for the Company's reportable segments	'
		Three Months Ended						Nine Months Ended
		September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	Revenue:
	PV	$	4,369		$	1,556		$	20,144		$	42,357
	Polysilicon	28,564			95,856			217,279			371,320
	Sapphire	7,358			12,649			28,974			217,526
	Total revenue	40,291			110,061			266,397			631,203
	Gross Profit:
	PV	$	2,893		$	(3,312	)	$	2,290		$	14,473
	Polysilicon	20,032			35,095			95,119			148,412
	Sapphire	(5,148		)	3,245			(7,401		)	84,677
	Total gross profit	17,777			35,028			90,008			247,562
	Research and development	21,075			18,767			56,039			47,954
	Sales and marketing	3,496			3,123			10,870			9,657
	General and administrative	17,427			15,428			48,507			45,731
	Contingent consideration expense (income)	4,971			(9,943		)	997			(9,261		)
	Restructuring charges	4,010			—			6,868			—
	Amortization of intangible assets	2,976			2,538			8,098			7,631
	Income (loss) from operations	(36,178		)	5,115			(41,371		)	145,850
	Interest income	122			27			286			50
	Interest expense	(6,456		)	(1,620		)	(20,462		)	(3,398		)
	Other, net	62			(431		)	73			(968		)
	Income (loss) before taxes	$	(42,450	)	$	3,091		$	(61,474	)	$	141,534
Schedule of revenue by geographic region based on the destination of the shipments	'
		Three Months Ended						Nine Months Ended
		September 28, 2013			September 29, 2012			September 28, 2013			September 29, 2012
	China	$	8,969		$	14,038		$	39,652		$	267,001
	Korea	17,796			83,001			54,343			216,431
	Other Asia	9,334			9,191			161,349			134,829
	Europe	848			397			1,767			1,604
	United States	3,298			2,285			9,158			7,623
	Other	46			1,149			128			3,715
	Total	$	40,291		$	110,061		$	266,397		$	631,203
Summary of long-lived assets by geographical region	'
		September 28, 2013(1)			December 31, 2012(1)
	United States	$	158,202		$	150,738
	Luxembourg	59,646			63,024
	China	664			1,382
	Taiwan	84			121
	Hong Kong	842			1,252
	Total	$	219,438		$	216,517
	(1) Long-lived assets at September 28, 2013 and December 31, 2012, include intangible assets and goodwill of $153,683 and $138,537, respectively, all located in the United States, with the exception of $1,711 and $61,313 of goodwill and intangibles, respectively, at December 31, 2012, which are located in Luxembourg.  At September 28, 2013 the amounts of goodwill and intangibles that were not located in the United States, but in Luxembourg were $1,711 and $57,935, respectively.

Basis_of_Presentation_Details

Basis of Presentation (Details) (USD $)	1 Months Ended	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Reclassifications	'	'	'	'	'
Contingent consideration income	'	'	$9,943	'	$9,261
Impairment charges on PV inventory	60,192	'	'	'	'
Impairment charges on PV vendor advances	8,352	'	'	'	'
Impairment of goodwill	57,037	'	'	0	'
Impairment charges on PV long-lived, intangible and other assets	29,261	'	'	'	'
Income (loss) from operations	'	-36,178	5,115	-41,371	145,850
Net (Loss) income	'	-38,146	2,344	-44,880	96,174
Cash for operating activities	'	'	'	109,163	22,704
Impairment charge related to certain intangible assets in PV business	'	$0	'	'	'

Basis_of_Presentation_Details_

Basis of Presentation (Details 2) (2012 Term Facility and Incremental Term Loans, Bank of America, USD $)	0 Months Ended	3 Months Ended
In Thousands, unless otherwise specified	Oct. 30, 2013	Dec. 31, 2013	Sep. 28, 2013
2012 Term Facility and Incremental Term Loans | Bank of America	'	'	'
Debt Instrument [Line Items]	'	'	'
Outstanding borrowings under the term loan component of the Credit Agreement paid	$96,000	'	'
Stand-by letters of credit principal amount outstanding	0	'	'
Deferred loan costs expected to be recognized	'	3,639	'
Debt balance outstanding	$0	'	$96,000

Basis_of_Presentation_Details_1

Basis of Presentation (Details 3) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Basis of presentation	'	'	'	'
Revenue	$40,291	$110,061	$266,397	$631,203
Gross profit	17,777	35,028	90,008	247,562
SDR-400	'	'	'	'
Basis of presentation	'	'	'	'
Number of product installations	'	'	30	'
Number of customers' facilities at which product installations are done	'	'	1	'
Revenue	3,080	'	148,740	'
Gross profit	$681	'	$59,501	'
Number of customer arrangements from which revenue is generated	'	'	2	'

Acquisitions_Details

Acquisitions (Details) (USD $)	3 Months Ended		9 Months Ended		9 Months Ended	3 Months Ended	4 Months Ended	9 Months Ended
In Thousands, except Share data in Millions, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013	Sep. 28, 2013	Nov. 08, 2012	Sep. 28, 2013	Sep. 28, 2013	Sep. 28, 2013	Sep. 28, 2013	16-May-13	Sep. 28, 2013	Sep. 28, 2013
	Twin Creeks Technologies, Inc.	Twin Creeks Technologies, Inc.	Twin Creeks Technologies, Inc.	Twin Creeks Technologies, Inc.	Twin Creeks Technologies, Inc.	Thermal Technology, LLC	Thermal Technology, LLC	Thermal Technology, LLC	Thermal Technology, LLC	Thermal Technology, LLC	Thermal Technology, LLC
					Maximum					Minimum	Maximum
Acquisitions	'	'	'	'	'	'	'	'	'	'	'
Common stock purchase consideration (in shares)	'	'	'	'	'	'	'	'	3.4	'	'
Aggregate value of common stock	'	'	'	'	'	$14,463	$14,463	$14,463	$14,463	'	'
Revenue contribution of acquired business	'	'	'	'	'	'	3,545	'	'	'	'
Purchase consideration paid in cash	10,172	'	10,172	10,172	'	'	'	'	'	'	'
Potential additional contingent consideration	'	'	'	40,000	'	'	'	'	35,000	'	'
Fair value of the contingent consideration	5,200	'	5,200	5,200	'	6,211	6,211	6,211	6,211	'	'
Loss from acquired business	'	'	'	'	'	'	3,071	'	'	'	'
Fair value of consideration transferred:	'	'	'	'	'	'	'	'	'	'	'
Common stock	'	'	'	'	'	14,463	14,463	14,463	14,463	'	'
Cash	10,172	'	10,172	10,172	'	'	'	'	'	'	'
Contingent consideration obligations	5,200	'	5,200	5,200	'	6,211	6,211	6,211	6,211	'	'
Preliminary estimate of net working capital adjustment	'	'	'	'	'	-735	-735	-735	'	'	'
Total fair value of consideration	15,372	'	15,372	15,372	'	19,939	19,939	19,939	'	'	'
Fair value of assets acquired and liabilities assumed:	'	'	'	'	'	'	'	'	'	'	'
Accounts receivable	'	'	'	'	'	1,008	1,008	1,008	'	'	'
Inventory	'	'	'	'	'	7,861	7,861	7,861	'	'	'
Property, plant and equipment	1,529	'	1,529	'	'	1,700	1,700	1,700	'	'	'
Deferred tax asset	'	'	'	'	'	411	411	411	'	'	'
Other assets	23	'	23	'	'	439	439	439	'	'	'
Intangible assets	'	'	'	'	'	14,500	14,500	14,500	'	'	'
In-process research and development	12,300	'	12,300	'	'	'	'	'	'	'	'
Goodwill	2,907	'	2,907	'	'	6,744	6,744	6,744	6,744	'	'
Accounts payable	-1,362	'	-1,362	'	'	'	'	'	'	'	'
Accounts payable and accrued expenses	'	'	'	'	'	-7,057	-7,057	-7,057	'	'	'
Customer deposits	'	'	'	'	'	-2,509	-2,509	-2,509	'	'	'
Deferred tax liability	'	'	'	'	'	-3,149	-3,149	-3,149	'	'	'
Other current liabilities	-25	'	-25	'	'	-9	-9	-9	'	'	'
Total net assets acquired	15,372	'	15,372	'	'	19,939	19,939	19,939	'	'	'
Increase to goodwill due to update of preliminary valuation of assets acquired	'	2,000	'	'	'	'	'	'	'	'	'
Decrease to deferred tax assets due to update of preliminary valuation of assets acquired	'	2,000	'	'	'	'	'	'	'	'	'
Set-off amount for infringement claims brought by third-parties related to the Intellectual property acquired	'	'	'	'	6,000	'	'	'	'	'	'
Term of license agreement	'	'	'15 years	'	'	'	'	'	'	'	'
Undiscounted probable outcomes used to value contingent consideration	27,562	'	27,562	'	'	'	'	'	'	7,507	20,205
Transaction cost incurred in connection with acquisition	'	'	'	'	'	'	'	1,188	'	'	'
Contingent consideration (income) expense	$6,046	'	$6,747	'	'	($1,075)	'	($934)	'	'	'
Discount rate (as a percent)	'	'	-28.00%	'	'	'	'	'	'	'	'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)

9 Months Ended

In Thousands, unless otherwise specified

Sep. 28, 2013

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

item

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Recurring basis

Level 1

Level 1

Level 2

Level 2

Level 2

Level 2

Level 3

Level 3

Fair Value

Fair Value

Fair Value

Fair Value

Total Carrying Value

Total Carrying Value

Total Carrying Value

Total Carrying Value

3.00% Senior Convertible Notes

3.00% Senior Convertible Notes

3.00% Senior Convertible Notes

3.00% Senior Convertible Notes

3.00% Senior Convertible Notes

3.00% Senior Convertible Notes

Fair Value Measurements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Asset transfers between levels

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liability transfers between levels

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Money market mutual funds

'

179,144

200,041

'

'

'

'

'

'

'

'

'

'

179,144

200,041

'

'

Forward foreign exchange contracts

'

'

'

'

230

'

'

'

'

'

'

'

'

'

230

'

'

Liabilities:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Contingent consideration

'

'

'

'

'

'

'

17,523

10,315

'

'

'

'

17,523

10,315

'

'

Long-term debt obligations

'

'

'

$96,138

$139,563

$282,659

$157,300

'

'

$96,138

$139,563

$282,659

$157,300

$95,938

$139,563

$165,390

$157,440

Number of changes in the valuation techniques used to measure the fair value of forward foreign exchange contracts

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair_Value_Measurements_Detail1

Fair Value Measurements (Details 2) (USD $)

1 Months Ended

3 Months Ended

9 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 28, 2013

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Jun. 29, 2013

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Hazelwood facility

Non - recurring basis

Non - recurring basis

Weighted average

Confluence Solar, Inc.

Contingent consideration obligations

Contingent consideration obligations

Contingent consideration obligations

Contingent consideration obligations

Contingent consideration obligations

Contingent consideration obligations

Contingent consideration obligations

Level 3

Level 3

Non - recurring basis

Twin Creeks

Twin Creeks

Thermal Technology, LLC

Hazelwood facility

Hazelwood facility

Level 3

Minimum

Weighted average

Hazelwood facility

Changes in the fair value of the Company's Level 3 liabilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair value as of the beginning of the period

'

'

'

'

'

'

'

'

$12,552

$14,762

$10,315

$23,713

'

'

'

Acquisition date fair value of contingent consideration obligations related to acquisitions

'

'

'

'

'

'

'

'

'

'

6,211

'

'

'

'

Changes in the fair value of contingent consideration obligations

'

'

'

'

'

'

'

'

4,971

-9,943

997

-9,261

'

'

'

Payments of contingent consideration obligations

'

'

'

'

'

'

'

'

'

'

'

-9,633

'

'

'

Fair value at the end of the period

'

'

'

'

'

'

'

'

17,523

4,819

17,523

4,819

'

'

'

Revised probability factor associated with the technical target (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

28.00%

28.00%

20.40%

Probability adjusted discount rate for revenue target (as a percent)

'

'

'

'

'

'

'

'

'

'

'

'

25.00%

75.00%

'

Reversal of the contingent consideration liability

'

'

'

'

'

'

'

4,816

'

'

'

'

'

'

'

Contingent consideration expense (income)

'

-9,943

-9,261

'

'

'

'

'

4,971

-9,943

997

-9,261

'

'

'

Assets:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-lived asset group

'

'

'

1,155

1,155

5,165

'

'

'

'

'

'

'

'

'

Long-lived asset group, Total Losses

29,261

'

'

'

4,010

29,261

'

'

'

'

'

'

'

'

'

Long-lived asset group of the Hazelwood facility

'

'

'

'

'

'

$1,155

'

'

'

'

'

'

'

'

Percentage of projected option cost as an input to measure fair value

'

'

'

'

'

'

75.00%

'

'

'

'

'

'

'

'

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details) (USD $)	1 Months Ended	9 Months Ended		3 Months Ended					9 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2012	Sep. 28, 2013	Sep. 28, 2013	Mar. 30, 2013	Sep. 28, 2013	Dec. 31, 2012	Sep. 28, 2013	Dec. 31, 2012	Sep. 28, 2013
			Thermal Technology, LLC	Twin Creeks	Photovoltaic Business	Photovoltaic Business	Sapphire Business	Sapphire Business	Sapphire Business
									Thermal Technology, LLC
Change in the Company's goodwill	'	'	'	'	'	'	'	'	'
Goodwill, gross at the beginning of the period	'	$105,058	'	'	$61,399	$61,399	$50,403	$43,659	'
Accumulated impairment losses at the beginning of the period	'	-57,037	'	'	-57,037	-57,037	'	'	'
Goodwill, net at the beginning of the period	'	48,021	'	'	4,362	4,362	50,403	43,659	'
Acquisitions	'	'	6,744	'	'	'	'	'	6,744
Goodwill, gross at the end of the period	105,058	111,802	'	'	61,399	61,399	50,403	43,659	'
Accumulated impairment losses at the end of the period	-57,037	-57,037	'	'	-57,037	-57,037	'	'	'
Goodwill, net at the end of the period	48,021	54,765	'	'	4,362	4,362	50,403	43,659	'
Goodwill impairment loss	57,037	0	'	'	'	'	'	'	'
Increase to goodwill due to update of preliminary valuation of assets acquired	'	'	'	2,000	'	'	'	'	'
Decrease to deferred tax assets due to update of preliminary valuation of assets acquired	'	'	'	$2,000	'	'	'	'	'

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Details 2) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Photovoltaic Business

Photovoltaic Business

Photovoltaic Business

Photovoltaic Business

Photovoltaic Business

Photovoltaic Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Technology

Technology

Trade names / Trademarks

Trade names / Trademarks

Technology

Technology

Customer relationships

Customer relationships

Technology

Technology

Order backlog

Order backlog

Trade names

Trade names

Non-compete agreements

Non-compete agreements

Acquired intangible assets subject to amortization

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted Average Amortization Period

'

'

'

'

'9 years 6 months

'

'8 years 7 months 6 days

'

'

'

'2 years 7 months 6 days

'

'

'

'6 years 4 months 24 days

'

'9 years 3 months 18 days

'

'1 year 2 months 12 days

'

'8 years

'

'5 years 9 months 18 days

'

Gross Amount

$121,300

$104,800

$81,300

$79,300

$74,200

$72,200

$7,100

$7,100

$1,500

$1,500

$1,500

$1,500

$38,500

$24,000

$7,300

$4,100

$28,600

$17,300

$500

$500

$1,100

$1,100

$1,000

$1,000

Accumulated Amortization

34,682

26,584

23,365

17,987

19,977

14,951

3,388

3,036

1,500

1,500

1,500

1,500

9,817

7,097

2,331

1,651

5,983

4,181

500

500

435

332

568

433

Net

86,618

78,216

57,935

61,313

54,223

57,249

3,712

4,064

'

'

'

'

28,683

16,903

4,969

2,449

22,617

13,119

'

'

665

768

432

567

Indefinite-lived intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

In-process research and development

12,300

12,300

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross Amount

133,600

117,100

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net

98,918

90,516

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Impairment charge related to certain intangible assets

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Weighted average remaining amortization period

'

'

'7 years 1 month 2 days

'

'

'

'

'

'0 years

'

'

'

'6 years 5 months 8 days

'

'

'

'

'

'

'

'

'

'

'

Estimated future amortization expense for the Company's intangible assets

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2013 (remaining three months)

2,975

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2014

11,881

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2015

11,852

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2016

11,519

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2017

11,052

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2018

10,990

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Thereafter

$38,649

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Customer_Concentrations_Detail

Customer Concentrations (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Dec. 31, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Sep. 29, 2012

Dec. 31, 2012

Dec. 31, 2012

Sep. 28, 2013

Dec. 31, 2012

Sep. 28, 2013

Photovoltaic Business

Photovoltaic Business

Photovoltaic Business

Photovoltaic Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Revenue

Accounts Receivable

Accounts Receivable

Accounts Receivable

Accounts Receivable

Accounts Receivable

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Customer concentration

Credit concentration

Credit concentration

Credit concentration

Credit concentration

Credit concentration

Customer #6

Customer #6

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Sapphire Business

Sapphire Business

Sapphire Business

Sapphire Business

Photovoltaic Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Polysilicon Business

Customer #2

Customer #3

Customer #3

Customer #4

Customer #5

Customer #6

Customer #6

Customer #7

Customer #8

Customer #9

Customer #6

Customer #6

Customer #6

Customer #11

Customer #1

Customer #4

Customer #7

Customer #7

Customer #10

Maximum

Customer Concentrations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Revenue

$40,291

$110,061

$266,397

$631,203

'

$4,369

$1,556

$20,144

$42,357

$28,564

$95,856

$217,279

$371,320

$7,358

$12,649

$28,974

$217,526

'

'

$17,600

$7,919

$108,579

$45,268

$34,915

$43,459

$139,337

$39,142

$82,316

$77,870

$310

$34,790

'

$63,950

'

'

'

'

'

Accounts receivable, net

7,471

'

7,471

'

23,829

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,478

9,085

1,200

3,248

1,450

% of Total

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44.00%

20.00%

41.00%

17.00%

13.00%

39.00%

22.00%

36.00%

13.00%

12.00%

'

6.00%

1.00%

10.00%

10.00%

38.00%

16.00%

14.00%

19.00%

Total accounts receivable secured by letters of credit

3,174

'

3,174

'

16,557

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total accounts receivable secured by letters of credit (as a percent)

42.00%

'

42.00%

'

69.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of total revenue from customer

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40.00%

28.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total revenue from customer

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$43,769

$174,127

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative_and_Hedging_Activit2

Derivative and Hedging Activities (Details) (Instruments Designated as Cash Flow Hedges, Forward foreign currency exchange contracts, USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013
Instruments Designated as Cash Flow Hedges | Forward foreign currency exchange contracts	'
Derivative and Hedging Activities	'
Derivative contracts expiration period	'12 months
Amount of forward foreign currency exchange purchase contracts	$0

Derivative_and_Hedging_Activit3

Derivative and Hedging Activities (Details 2) (Instruments designated as hedging instruments, Forward foreign currency exchange contracts, USD $)	Dec. 31, 2012
In Thousands, unless otherwise specified
Instruments designated as hedging instruments | Forward foreign currency exchange contracts	'
Derivative and Hedging Activities	'
Assets	$230

Derivative_and_Hedging_Activit4

Derivative and Hedging Activities (Details 3) (USD $)	3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended		3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Sep. 29, 2012	Sep. 29, 2012	Sep. 28, 2013
			Instruments designated as hedging instruments	Instruments designated as hedging instruments	Instruments designated as hedging instruments	Derivatives Not Designated as Hedging Instruments	Derivatives Not Designated as Hedging Instruments	Cash Flow Hedges.
			Forward foreign currency exchange contracts	Forward foreign currency exchange contracts	Forward foreign currency exchange contracts	Forward foreign currency exchange contracts	Forward foreign currency exchange contracts	Forward foreign currency exchange contracts
Derivative and Hedging Activities	'	'	'	'	'	'	'	'
Amount of (Gain) or Loss recognized in OCI on Derivative (Effective Portion)	'	'	$173	$4	$641	'	'	'
Amount of Gain or (Loss) Reclassified from AOCI into Income (Effective Portion)	0	-51	-498	60	-2,775	'	'	'
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	'	'	'	'	'	-287	-886	'
Loss recognized in earnings due to discontinuation of cash flow hedging	'	'	'	'	'	'	'	0
Accumulated gain expected to be reclassified into earnings over the next twelve months	'	'	'	'	'	'	'	$0

Inventories_Details

Inventories (Details) (USD $)	Sep. 28, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Inventories	'	'
Raw materials	$109,137	$97,957
Work-in-process	8,563	5,100
Finished goods	5,489	30,229
Inventories	$123,189	$133,286

Other_Assets_Details

Other Assets (Details) (USD $)	Sep. 28, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Assets	'	'
Inventory	$36,724	$33,834
Vendor advances	18,524	20,664
Deferred financing fees	7,945	8,787
Deferred income taxes	21,222	15,424
Other	7,666	8,211
Total other assets	$92,081	$86,920

Warranty_Details

Warranty (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012
Warranty activities	'	'
Product warranty liability, beginning of the period	$10,711	$4,764
Accruals for warranties issued	7,157	9,029
Payments under warranty	-5,500	-4,578
Product warranty liability, end of the period	$12,368	$9,215

Restructuring_Charges_and_Asse2

Restructuring Charges and Asset Impairments (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Mar. 30, 2013

Dec. 31, 2012

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

October 2012 Restructuring

Hazelwood Facility

Hazelwood Facility

Hazelwood Facility

Hazelwood facility

Employee related benefits

Lease Exit and Contract Termination Costs

Lease Exit and Contract Termination Costs

Asset impairments

Photovoltaic Business

Photovoltaic Business

Polysilicon Business

Sapphire Business

Corporate Services

item

Hazelwood Facility

October 2012 Restructuring

Lease Exit and Contract Termination Costs

October 2012 Restructuring

October 2012 Restructuring

October 2012 Restructuring

Hazelwood Facility

Restructuring Charges and Asset Impairments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring and asset impairment expense

'

'

'

'

$29,782

'

'

'

'

'

'

'

'

'

'

'

Severance and related benefits

'

'

362

'

521

'

'

'

'

'

'

159

'

14

44

145

Write-down of assets associated with personnel reductions and facility consolidations

'

'

'

'

29,261

'

'

'

'

'

'

'

'

'

'

'

Number of employees terminated

'

'

'

37

'

'

'

'

'

'

'

'

'

'

'

'

Additional charges related to the facilities lease exit costs

'

'

'

'

'

'

'

'

'

1,854

'

'

'

'

'

'

Other costs related to facility

'

'

'

'

'

'

'

'

'

642

'

'

'

'

'

'

Impairment charge related to certain intangible assets

0

'

'

'

'

'

'

'

'

'

'

'

4,010

'

'

'

Restructuring reserves

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Restructuring charges as of the beginning of the period

'

2,209

'

'

'

'

'

2,076

133

'

'

'

'

'

'

'

Restructuring charges

'

6,868

'

'

'

'

'

362

2,496

'

4,010

'

'

'

'

'

Cash payments

'

-3,109

'

'

'

'

'

-2,044

-1,065

'

'

'

'

'

'

'

Asset impairments

'

-4,010

'

'

'

'

'

'

'

'

-4,010

'

'

'

'

'

Restructuring charges at the end of the period

1,958

1,958

'

'

'

'

'

394

1,564

'

'

'

'

'

'

'

Fair value of assets

'

'

'

'

'

'

1,155

'

'

'

'

'

'

'

'

'

Long-lived asset group that does not meet the criteria of held-for-sale

'

'

'

'

'

$1,155

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Income Taxes	'	'	'	'
Effective tax rate (as a percent)	10.10%	24.20%	26.90%	32.00%
Reconciliation of the beginning and ending amount of the consolidated liability for unrecognized tax benefits	'	'	'	'
Unrecognized tax benefits, balance at the beginning of the period	'	'	$26,322	'
Increases related to current year tax positions	'	'	272	'
Increases related to prior year tax positions	'	'	372	'
Settlements with tax authorities	'	'	-1,464	'
Unrecognized tax benefits, balance at the end of the period	25,502	'	25,502	'
Income tax provision recorded on reversing certain interest and penalty accruals	277	'	355	'
Estimated income taxes paid	'	'	$16,109	$51,079

Commitments_and_Contingencies_

Commitments and Contingencies (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Dec. 31, 2012
Purchase commitments	'	'
Amount accrued under purchase orders	$0	'
Gross amount outstanding under purchase orders	14,284	'
Purchase Commitments	'	'
Purchase commitments	'	'
Estimated commitments to purchase raw materials, research and development and other services	329,147	214,611
Period within which majority of commitments are due	'12 months	'
Vendor contract dispute	'	'
Purchase commitments	'	'
Settlement payable	$3,250	'

LongTerm_Debt_and_Convertible_2

Long-Term Debt and Convertible Notes (Details) (USD $)

3 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

0 Months Ended

In Thousands, unless otherwise specified

Sep. 28, 2013

Sep. 28, 2013

Sep. 28, 2013

Sep. 29, 2012

Sep. 28, 2013

Sep. 29, 2012

Oct. 30, 2013

Feb. 27, 2013

Dec. 31, 2013

Sep. 28, 2013

Jan. 31, 2012

Jun. 25, 2012

Sep. 28, 2013

Jan. 31, 2012

Feb. 27, 2013

Jan. 31, 2012

2012 Credit Agreement

2012 Credit Agreement

2012 Credit Agreement

2012 Credit Agreement

2012 Term Facility and Incremental Term Loans

2012 Term Facility and Incremental Term Loans

2012 Term Facility and Incremental Term Loans

2012 Term Facility and Incremental Term Loans

2012 Term Facility and Incremental Term Loans

Incremental term loan

Hong Kong Revolving Credit Facility

Hong Kong Revolving Credit Facility

Hong Kong Revolving Credit Facility

Hong Kong Revolving Credit Facility

U.S.

U.S.

U.S.

U.S.

Bank of America

Bank of America

Bank of America

Bank of America

Bank of America

U.S.

Bank of America

U.S.

Hong Kong

Hong Kong

Bank of America

Bank of America

Bank of America

Long-Term Debt and Revolving Credit Facility

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Aggregate maximum principal amount

'

'

'

'

'

'

'

'

'

$145,000

$75,000

'

'

$25,000

$125,000

'

Aggregate principal amount of debt before amendment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

150,000

Aggregate increase in principal amount of debt

'

'

'

'

'

'

'

'

'

'

'

70,000

'

'

'

'

Interest expense which includes amortization of debt fees

'

'

1,859

1,470

6,839

3,185

'

'

'

'

'

'

'

'

'

'

Weighted average interest rate (as a percent)

'

'

4.69%

'

4.25%

'

'

'

'

'

'

'

'

'

'

'

Interest capitalized on construction-in-process contracts

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred financing costs

'

'

3,639

'

3,639

'

'

'

'

'

'

'

'

'

'

'

Outstanding letters of credit

'

'

'

'

'

'

'

'

'

'

'

'

539

'

'

'

Available credit

'

'

'

'

'

'

'

'

'

'

'

'

124,461

'

'

'

Stand-by letters of credit principal amount outstanding

'

'

'

'

'

'

0

'

'

'

'

'

'

'

'

'

Pre-payment of term facility pursuant to amendment

'

'

'

'

'

'

'

40,000

'

'

'

'

'

'

'

'

Outstanding borrowings under the term loan component of the Credit Agreement paid

'

'

'

'

'

'

96,000

'

'

'

'

'

'

'

'

'

Deferred loan costs expected to be recognized

'

'

'

'

'

'

'

'

3,639

'

'

'

'

'

'

'

Debt balance outstanding

'

'

'

'

'

'

$0

'

'

$96,000

'

'

'

'

'

'

LongTerm_Debt_and_Convertible_3

Long-Term Debt and Convertible Notes (Details 2) (USD $)	9 Months Ended					0 Months Ended	3 Months Ended	9 Months Ended
Share data in Millions, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Dec. 31, 2012	Sep. 28, 2012	Sep. 28, 2013	Sep. 28, 2012	Sep. 28, 2013	Sep. 28, 2013
				Call options purchased	2012 Term Facility and Incremental Term Loans	3.00% Convertible Senior Notes due 2017	3.00% Convertible Senior Notes due 2017	3.00% Convertible Senior Notes due 2017
					Bank of America
Long-Term Debt and Revolving Credit Facility	'	'	'	'	'	'	'	'
Aggregate increase in principal amount of debt	'	'	'	'	'	$220,000,000	'	'
Net proceeds from notes issued after deducting fees paid to the initial purchasers and other offering costs	'	'	'	'	'	212,592,000	'	'
Stated interest rate of notes issued (as a percent)	'	'	'	'	'	3.00%	3.00%	3.00%
Debt instrument, initial conversion rate (as a percent)	'	'	'	'	'	'	'	0.1297185
Conversion ratio, principal amount	'	'	'	'	'	'	'	1,000
Debt instrument, number of shares issued on conversion	'	'	'	'	'	'	'	28.5
Debt Instrument, Convertible, Effective Conversion Price (in dollars per share)	'	'	'	$7.71	'	'	'	'
Effective interest rate on the liability component (as a percent)	'	'	'	'	'	'	'	10.70%
Principal balance	'	'	'	'	'	'	220,000,000	220,000,000
Discount, net of accumulated amortization of $10,506	'	'	'	'	'	'	-54,610,000	-54,610,000
Carrying amount	'	'	'	'	'	'	165,390,000	165,390,000
Accumulated Amortization	34,682,000	'	26,584,000	'	'	'	10,506,000	10,506,000
Principal amount required to be paid over the next four fiscal years	'	'	'	'	'	'	'	'
2013 (remaining 3 months)	'	'	'	'	3,625,000	'	'	'
2014	'	'	'	'	12,688,000	'	'	'
2015	'	'	'	'	14,500,000	'	'	'
2016	'	'	'	'	65,125,000	'	'	'
2017	'	'	'	'	220,000,000	'	'	'
Total	'	'	'	'	315,938,000	'	'	'
Contractual coupon rate of interest	'	'	'	'	'	'	1,659,000	4,969,000
Convertible notes discount amortization	7,950,000	62,000	'	'	'	'	3,158,000	8,633,000
Interest expense - Convertible Notes	'	'	'	'	'	'	$4,817,000	$13,602,000

ShareBased_Compensation_Detail

Share-Based Compensation (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Share-Based Compensation	'	'	'	'
Stock-based compensation expense	$4,555	$4,818	$13,883	$13,091
Unamortized share-based compensation expense	23,516	'	23,516	'
Weighted average remaining requisite service period	'	'	'1 year 8 months 8 days	'
Restricted Stock Units	'	'	'	'
Share-Based Compensation	'	'	'	'
Granted (in shares)	'	'	3,158	'
Total fair value of awards granted	'	'	10,771	'
Granted (in dollars per share)	'	'	$3.41	'
Market-based restricted stock units	'	'	'	'
Share-Based Compensation	'	'	'	'
Granted (in shares)	'	'	890	'
Total fair value of awards granted	'	'	$2,688	'
Granted (in dollars per share)	'	'	$3.02	'
Stock options	'	'	'	'
Share-Based Compensation	'	'	'	'
Awards granted (in shares)	'	'	0	'

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Increase (Decrease) in Stockholders' Equity	'	'	'	'
Balance	'	'	$242,251	'
Balance (in shares)	'	'	119,293	'
Net (loss) income	-38,146	2,344	-44,880	96,174
Other comprehensive income	66	530	260	1,690
Common stock issued for Thermal Tech acquisition (net of $46 of registration costs)	'	'	14,417	'
Registration costs related to acquisition	'	'	33	'
Option exercises and vesting of restricted stock units	'	'	115	'
Share-based compensation expense	'	'	13,490	'
Excess tax deficiency from share-based award activity	'	'	-1,396	'
Minimum tax withholding payments for employee share-based awards	'	'	-1,516	'
Balance	222,741	'	222,741	'
Balance (in shares)	123,758	'	123,758	'
Common Stock	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'
Balance	'	'	1,193	'
Balance (in shares)	'	'	119,293	'
Common stock issued for Thermal Tech acquisition (net of $46 of registration costs)	'	'	46	'
Common stock issued for Thermal Tech acquisition (net of $46 of registration costs) (in shares)	'	'	3,356	'
Option exercises and vesting of restricted stock units	'	'	14	'
Option exercises and vesting of restricted stock units (in shares)	'	'	1,448	'
Minimum tax withholding payments for employee share-based awards	'	'	-3	'
Minimum tax withholding payments for employee share-based awards (in shares)	'	'	-339	'
Balance	1,237	'	1,237	'
Balance (in shares)	123,758	'	123,758	'
Additional Paid-in Capital	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'
Balance	'	'	183,565	'
Common stock issued for Thermal Tech acquisition (net of $46 of registration costs)	'	'	14,384	'
Option exercises and vesting of restricted stock units	'	'	101	'
Share-based compensation expense	'	'	13,490	'
Excess tax deficiency from share-based award activity	'	'	-1,396	'
Minimum tax withholding payments for employee share-based awards	'	'	-1,513	'
Balance	208,631	'	208,631	'
Retained Earnings	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'
Balance	'	'	56,687	'
Net (loss) income	'	'	-44,880	'
Balance	11,807	'	11,807	'
Accumulated Other Comprehensive Income	'	'	'	'
Increase (Decrease) in Stockholders' Equity	'	'	'	'
Balance	'	'	806	'
Other comprehensive income	'	'	260	'
Balance	$1,066	'	$1,066	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)	3 Months Ended	9 Months Ended			3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 28, 2013	Sep. 28, 2013	Jun. 29, 2013	Sep. 28, 2013	Sep. 28, 2013
			Unrealized Gains and Losses on Cash Flow Hedges	Unrealized Gains and Losses on Cash Flow Hedges	Foreign Currency Items	Foreign Currency Items
Changes in accumulated balances of other comprehensive income	'	'	'	'	'	'
Balance at the beginning of the period	$1,000	$806	($537)	($591)	$1,591	$1,343
Other comprehensive income (loss) before reclassifications	66	311	-3	'	66	314
Amounts reclassified from accumulated other comprehensive income	'	-51	-51	'	'	'
Net other comprehensive income	66	260	-54	'	66	314
Balance at the end of the period	1,066	1,066	-591	-591	1,657	1,657
Amount of gain (loss) reclassified from AOCI to cost of revenue	$0	($51)	'	'	'	'

Earnings_Per_Share_Details

Earnings Per Share (Details)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Weighted-average number of shares used in per share calculations:	'	'	'	'
Weighted average common shares-basic	122,183	118,769	119,752	118,873
Dilutive common stock options and restricted stock unit awards (in shares)	'	1,105	'	1,253
Weighted average common and common equivalent shares-diluted	122,183	119,874	119,752	120,126

Earnings_Per_Share_Details_2

Earnings Per Share (Details 2) (USD $)	3 Months Ended		9 Months Ended
	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
Stock options and restricted stock units	'	'	'	'
Long-Term Debt and Revolving Credit Facility	'	'	'	'
Anti-dilutive securities excluded from computation of earnings per share	11,584,000	3,739,000	11,463,000	2,961,000
Warrant transactions	'	'	'	'
Long-Term Debt and Revolving Credit Facility	'	'	'	'
Number of shares of common stock that can be acquired upon exercise of warrants or rights	28,500,000	'	28,500,000	'
Exercise price of shares of common stock that can be acquired upon exercise of warrants (in dollars per share)	9.9328	'	9.9328	'

Segment_and_Geographical_Infor2

Segment and Geographical Information (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012
			segment
Segment and Geographical Information	'	'	'	'
Number of reportable segments	'	'	3	'
Financial information for the Company's business segments	'	'	'	'
Revenue	$40,291	$110,061	$266,397	$631,203
Gross profit	17,777	35,028	90,008	247,562
Research and development	21,075	18,767	56,039	47,954
Sales and marketing	3,496	3,123	10,870	9,657
General and administrative	17,427	15,428	48,507	45,731
Contingent consideration expense (income)	4,971	-9,943	997	-9,261
Restructuring charges	4,010	'	6,868	'
Amortization of intangible assets	2,976	2,538	8,098	7,631
(Loss) income from operations	-36,178	5,115	-41,371	145,850
Interest income	122	27	286	50
Interest expense	-6,456	-1,620	-20,462	-3,398
Other, net	62	-431	73	-968
(Loss) income before income taxes	-42,450	3,091	-61,474	141,534
PV	'	'	'	'
Financial information for the Company's business segments	'	'	'	'
Revenue	4,369	1,556	20,144	42,357
Gross profit	2,893	-3,312	2,290	14,473
Polysilicon Business	'	'	'	'
Financial information for the Company's business segments	'	'	'	'
Revenue	28,564	95,856	217,279	371,320
Gross profit	20,032	35,095	95,119	148,412
Sapphire Business	'	'	'	'
Financial information for the Company's business segments	'	'	'	'
Revenue	7,358	12,649	28,974	217,526
Gross profit	($5,148)	$3,245	($7,401)	$84,677

Segment_and_Geographical_Infor3

Segment and Geographical Information (Details 2) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 28, 2013	Sep. 29, 2012	Sep. 28, 2013	Sep. 29, 2012	Dec. 31, 2012
Revenues and long-lived assets information	'	'	'	'	'
Revenue	$40,291	$110,061	$266,397	$631,203	'
Long-lived assets	219,438	'	219,438	'	216,517
Goodwill	54,765	'	54,765	'	48,021
Intangibles	98,918	'	98,918	'	90,516
China	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Revenue	8,969	14,038	39,652	267,001	'
Long-lived assets	664	'	664	'	1,382
Korea	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Revenue	17,796	83,001	54,343	216,431	'
Other Asia	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Revenue	9,334	9,191	161,349	134,829	'
Europe	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Revenue	848	397	1,767	1,604	'
United States	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Revenue	3,298	2,285	9,158	7,623	'
Long-lived assets	158,202	'	158,202	'	150,738
Intangible assets and goodwill	153,683	'	153,683	'	138,537
Other	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Revenue	46	1,149	128	3,715	'
Luxembourg	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Long-lived assets	59,646	'	59,646	'	63,024
Goodwill	1,711	'	1,711	'	1,711
Intangibles	57,935	'	57,935	'	61,313
Taiwan	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Long-lived assets	84	'	84	'	121
Hong Kong	'	'	'	'	'
Revenues and long-lived assets information	'	'	'	'	'
Long-lived assets	$842	'	$842	'	$1,252

Subsequent_Event_Details

Subsequent Event (Details) (USD $)	0 Months Ended			0 Months Ended
	Oct. 30, 2013	Sep. 28, 2013	Oct. 31, 2013	Oct. 30, 2013	Sep. 28, 2013
	Bank of America	Bank of America	Subsequent event	Subsequent event	Subsequent event
	Credit Agreement	Credit Agreement	item	Bank of America	Bank of America
				Credit Agreement	Credit Agreement
Subsequent event	'	'	'	'	'
Prepayment agreement amount	'	'	$578,000,000	'	'
Number of installments	'	'	4	'	'
Period of prepayment agreement	'	'	'5 years	'	'
Outstanding borrowings under the term loan component of the Credit Agreement paid	96,000,000	'	'	96,000,000	'
Debt balance outstanding	0	96,000,000	'	0	96,000,000
Stand-by letters of credit principal amount outstanding	$0	'	'	$0	'