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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands
 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Cash flows from operating activities:    
Net income (loss) $ (14,815) $ 138,409
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 14,319 15,765
Depreciation 5,471 4,859
Amortization of intangible assets 5,981 2,288
Non-cash interest expense and amortization of convertible debt issuance costs 6,072 5,444
Deferred tax benefit (49) (49)
Loss on sale of marketable security   72
Change in operating assets and liabilities, net of effects of acquisition:    
Accounts receivable 2,386 705
Prepaid expenses and other assets 2,485 (1,877)
Accounts payable 6,185 (325)
Accrued salaries and benefits and other accrued liabilities (22,235) 12,645
Accrued litigation expenses 3,575 (2,115)
Income taxes payable (1,020) 432
Deferred revenue 7,092 187
Net cash provided by operating activities 15,447 176,440
Cash flows from investing activities:    
Acquisitions, net of cash acquired (167,381) (2,000)
Purchases of marketable securities (94,172) (189,610)
Maturities of marketable securities 208,003 95,806
Proceeds from sale of marketable security 11 1,518
Purchases of property and equipment (11,015) (2,543)
Acquisition of intangible assets   (2,250)
Net cash used in investing activities (64,554) (99,079)
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 7,953 9,487
Proceeds from landlord for tenant improvements 6,997  
Payments under installment payment arrangement (861) (1,150)
Principal payments against lease financing obligation (440)  
Proceeds received from issuance of contingently redeemable common stock and common stock pursuant to the settlement agreement with Samsung   192,000
Repayment of convertible senior notes   (136,950)
Repurchase and retirement of common stock   (95,285)
Net cash provided by (used in) financing activities 13,649 (31,898)
Net increase (decrease) in cash and cash equivalents (35,458) 45,463
Cash and cash equivalents at beginning of period 215,262 289,073
Cash and cash equivalents at end of period 179,804 334,536
Non-cash investing and financing activities:    
Common stock issued pursuant to acquisition 88,438  
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities 540 1,700
Non-cash obligation for property, plant and equipment   800
Intangible assets acquired under installment payment arrangement   $ 731