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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net Income (Loss) $ 198,396 $ 18,360
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 11,749 11,195
Depreciation 9,374 10,350
Amortization of intangible assets 18,914 20,295
Impairment of investment in non-marketable equity security 0 600
Non-cash interest expense and amortization of convertible debt issuance costs 4,744 13,226
Deferred income taxes (171,509) 6,475
Gain from sale of intellectual property and property, plant and equipment, net (3,257) (170)
Change in operating assets and liabilities:    
Accounts receivable (4,313) (2,848)
Prepaid expenses and other assets (3,736) (1,714)
Accounts payable (1,001) 425
Accrued salaries and benefits and other liabilities (7,370) (23,541)
Income taxes payable 593 (3,999)
Deferred revenue 1,674 1,761
Net cash provided by operating activities 54,258 50,415
Cash flows from investing activities:    
Purchases of property, plant and equipment (4,749) (5,593)
Purchases of marketable securities (124,862) (200,211)
Maturities of marketable securities 81,396 86,636
Proceeds from sale of marketable securities 43,134 17,689
Proceeds from sale of intellectual property and property, plant and equipment 3,510 2,500
Net cash used in investing activities (1,571) (98,979)
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 10,081 8,336
Principal payments against lease financing obligation (341) (226)
Payments under installment payment arrangement 0 (56)
Repayment of convertible senior notes 0 172,500
Net cash provided by (used in) financing activities 9,740 (164,446)
Net increase (decrease) in cash and cash equivalents 62,427 (213,010)
Cash and cash equivalents at beginning of period 154,126 338,696
Cash and cash equivalents at end of period 216,553 125,686
Non-cash investing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 542 $ 762