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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from operating activities:      
Net income (loss) $ 211,388 $ 26,201 $ (33,748)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Stock-based compensation 15,096 14,730 14,981
Depreciation 12,379 13,625 15,451
Amortization of intangible assets 25,074 26,618 28,909
Non-cash interest expense and amortization of convertible debt issuance costs 6,372 14,763 19,296
Impairment of goodwill and long-lived assets 0 0 17,751
Impairment of investment in non-marketable equity security 0 600 1,400
Deferred tax (benefit) provision (173,453) 1,829 1,619
Non-cash restructuring 583 0 653
Gain from sale of intellectual property and property, plant and equipment, net 3,670 3,529 1,024
Change in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable (10,407) (3,750) (1,722)
Prepaids and other assets (4,454) (2,431) 6,174
Accounts payable (2,621) 2,006 (1,544)
Accrued salaries and benefits and other accrued liabilities (4,030) (20,125) (8,791)
Income taxes payable 1,078 2,263 (716)
Deferred revenue 3,107 3,667 (7,647)
Net cash provided by operating activities 76,442 76,467 51,042
Cash flows from investing activities:      
Purchases of property, plant and equipment (6,132) (7,204) (6,938)
Acquisition of intangible assets 0 0 (2,656)
Purchases of marketable securities (157,811) (240,281) (125,554)
Maturities of marketable securities 112,721 118,735 119,600
Proceeds from sale of marketable securities 48,380 24,986 11,020
Proceeds from sale of intellectual property and property, plant and equipment, net 3,933 5,859 2,255
Net cash provided by (used in) investing activities 1,091 (97,905) (2,273)
Cash flows from financing activities:      
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program 100,113 0 0
Incremental tax benefits from stock-based compensation 747 481 300
Proceeds from issuance of convertible senior notes 0 0 138,000
Issuance costs related to issuance of convertible senior notes 0 0 (3,603)
Proceeds received from issuance of common stock under employee stock plans 13,783 11,079 8,391
Payments under installment payment arrangement (1,717) (1,773) (1,829)
Principal payments against financing lease obligation (478) (322) (178)
Repayment of senior convertible notes 0 (172,500) 0
Net cash provided by (used in) financing activities (87,778) (163,035) 141,081
Effect of exchange rate changes on cash and cash equivalents (117) (97) (138)
Net increase (decrease) in cash and cash equivalents (10,362) (184,570) 189,712
Cash and cash equivalents at beginning of year 154,126 338,696 148,984
Cash and cash equivalents at end of year 143,764 154,126 338,696
Cash paid during the period for:      
Interest 1,553 5,861 8,625
Income taxes, net of refunds 21,679 20,691 18,720
Non-cash investing and financing activities:      
Re-measurement of investment upon initial public offering 1,264 0 0
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities $ 240 $ 548 $ 5,909