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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash flows from operating activities:    
Net Income (Loss) $ 18,360 $ (23,971)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 11,195 11,885
Depreciation 10,350 11,566
Amortization of intangible assets 20,295 21,420
Non-cash interest expense and amortization of convertible debt issuance costs 13,226 13,369
Impairment of investment in non-marketable equity security 600 1,400
Impairment of goodwill and long-lived assets 0 8,070
Deferred income taxes 6,475 605
Non-cash restructuring 0 653
Gain from sale of intellectual property (170) (1,388)
Change in operating assets and liabilities, net of effects of acquisitions:    
Accounts receivable (2,848) (1,068)
Prepaid expenses and other assets (1,714) 5,898
Accounts payable 425 (399)
Accrued salaries and benefits and other liabilities (21,780) (17,589)
Income taxes payable (3,999) 380
Net cash provided by operating activities 50,415 30,831
Cash flows from investing activities:    
Purchases of property, plant and equipment (5,593) (5,942)
Acquisition of intangible assets 0 (2,500)
Purchases of marketable securities (200,211) (101,596)
Maturities of marketable securities 86,636 97,300
Proceeds from sale of marketable securities 17,689 0
Proceeds from sale of intellectual property 2,500 2,250
Net cash used in investing activities (98,979) (10,488)
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 8,336 4,610
Principal payments against lease financing obligation (226) (119)
Payments under installment payment arrangement (56) (84)
Repayment of convertible senior notes (172,500) 0
Proceeds from issuance of convertible senior notes 0 138,000
Issuance costs related to the issuance of convertible senior notes 0 (3,603)
Net cash provided by (used in) financing activities (164,446) 138,804
Effect of exchange rate changes on cash and cash equivalents 0 (170)
Net increase (decrease) in cash and cash equivalents (213,010) 158,977
Cash and cash equivalents at beginning of period 338,696 148,984
Cash and cash equivalents at end of period 125,686 307,961
Non-cash investing and financing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 762 $ 252