Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 30, 2014
Mar. 31, 2013
Cash Flows from Operating Activities:    
Net loss $ (22,495) $ (14,435)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 26,306 20,379
Gain on recovery from impaired investments (449) (1,200)
Benefit from deferred income taxes (47) (25)
Net gain on sale and disposal of property, plant and equipment (34) (592)
Loss on repurchase of 7.875% Senior Notes 1,137  
Compensation recognized under employee stock plans 8,481 8,624
Changes in assets and liabilities 6,480 (5,237)
Net cash provided by operating activities 19,379 7,514
Cash Flows from Investing Activities:    
Proceeds from recovery of impaired investments 449 1,530
Proceeds from sale of property, plant and equipment 96 612
Proceeds from sales and maturities of marketable securities 8,382 28,346
Purchases of property, plant and equipment (10,316) (12,883)
Purchases of marketable securities (9,876) (24,024)
Net cash used for investing activities (11,265) (6,419)
Cash Flows from Financing Activities:    
Proceeds from issuance of common stock due to options exercised 5,341 620
Refinancing cost on Term Loan and Revolver   (114)
Payments on financing arrangements   (2,064)
Repurchase of 7.875% Senior Notes including costs (96,319)  
Cash settlement of hedging activities   (268)
Net proceeds from sale of Sunnyvale property 58,908  
Net cash used for financing activities (32,070) (1,826)
Effect of exchange rate changes on cash and cash equivalents 360 286
Net decrease in cash and cash equivalents (23,596) (445)
Cash and cash equivalents, beginning of period 286,069 262,177
Cash and cash equivalents, end of period 262,473 261,732
Purchase of Property, Plant and Equipment [Member]
   
Non-cash investing and financing activities:    
Liabilities recorded for purchases of property, plant and equipment $ 11,788 $ 7,168