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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flows from operating activities:      
Net income (loss) $ (43,053) $ 150,917 $ (92,186)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Stock-based compensation 27,996 30,548 31,585
Depreciation 11,894 10,101 10,661
Amortization of intangible assets 20,191 5,066 2,984
Non-cash interest expense and amortization of convertible debt issuance costs 12,622 11,075 16,624
Deferred tax benefit (246) (73) (354)
Non-cash acquisition of patents (3,000)    
Loss (gain) on disposal of property, plant and equipment   (153) 15
Loss on sale of marketable security   87  
Impairment of investments     164
Change in assets and liabilities, net of effects of acquisition:      
Accounts receivable 2,714 (1,651) 554
Prepaids and other assets 8,810 4,643 997
Accounts payable 10,452 (3,811) 2,520
Accrued salaries and benefits and other accrued liabilities (783) 28,050 (5,063)
Accrued litigation expenses 6,442 (1,087) (9,118)
Income taxes payable (1,047) 1,506 25
Net cash provided by (used in) operating activities 52,992 235,218 (40,592)
Cash flows from investing activities:      
Acquisition of businesses, net of cash acquired (167,381) (17,000) (26,000)
Purchases of property, plant and equipment (19,431) (26,700) (2,665)
Acquisition of intangible assets (1,210) (7,760) (2,500)
Purchases of marketable securities (173,996) (428,768) (183,217)
Maturities of marketable securities 337,880 296,639 240,927
Proceeds from sale of marketable securities 33 1,829  
Proceeds from sale of property, plant and equipment   257  
Investment in non-marketable security     (2,000)
Net cash provided by (used in) investing activities (24,105) (181,503) 24,545
Cash flows from financing activities:      
Payment to redeem contingently redeemable common stock pursuant to the settlement agreement with Samsung (100,000)    
Proceeds received from issuance of contingently redeemable common stock and common stock pursuant to the settlement agreement with Samsung   192,000  
Proceeds from landlord for tenant improvements 8,800 292  
Proceeds received from issuance of common stock under employee stock plans 12,282 16,514 20,692
Payments under installment payment arrangement (2,531) (4,274)  
Principal payments against financing lease obligation (456)    
Repurchase and retirement of common stock, including prepayment under share purchase contract   (195,108)  
Repayment of convertible senior notes   (136,950)  
Issuance costs related to the issuance of convertible senior notes     (4,313)
Proceeds from issuance of convertible senior notes     172,500
Net cash provided by (used in) financing activities (81,905) (127,526) 188,879
Net increase (decrease) in cash and cash equivalents (53,018) (73,811) 172,832
Cash and cash equivalents at beginning of year 215,262 289,073 116,241
Cash and cash equivalents at end of year 162,244 215,262 289,073
Cash paid during the period for:      
Interest 8,625 8,625 3,943
Income taxes, net of refunds 16,254 56,689 123
Non-cash investing and financing activities:      
Common stock, net, issued pursuant to acquisition 86,143    
Non-cash obligation for property, plant and equipment 7,409 2,260 25,100
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities 3,093 7,714 200
Intangible assets acquired under installment payment arrangement   $ 500