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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Cash flows from operating activities:    
Net Income (Loss) $ 16,363 $ 12,847
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 8,181 7,754
Depreciation 6,295 6,979
Amortization of intangible assets 12,645 13,554
Non-cash interest expense and amortization of convertible debt issuance costs 3,140 11,711
Deferred income taxes 1,233 5,941
Gain from sale of intellectual property and property, plant and equipment (3,151) (170)
Change in operating assets and liabilities:    
Accounts receivable (744) (10,252)
Prepaid expenses and other assets (2,106) (1,283)
Accounts payable (1,873) 756
Accrued salaries and benefits and other liabilities (3,843) (19,630)
Income taxes payable 282 (3,982)
Deferred revenue 2,418 2,229
Net cash provided by operating activities 38,840 26,454
Cash flows from investing activities:    
Purchases of property, plant and equipment (3,117) (4,293)
Purchases of marketable securities (97,665) (166,070)
Maturities of marketable securities 70,396 51,428
Proceeds from sale of marketable securities 26,648 17,689
Proceeds from sale of intellectual property and property, plant and equipment 3,404 2,500
Net cash used in investing activities (334) (98,746)
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 9,053 5,855
Principal payments against lease financing obligation (208) (132)
Payments under installment payment arrangement 0 (56)
Repayments of Senior Debt 0 172,500
Net cash provided by (used in) financing activities 8,845 (166,833)
Net increase (decrease) in cash and cash equivalents 47,351 (239,125)
Cash and cash equivalents at beginning of period 154,126 338,696
Cash and cash equivalents at end of period 201,477 99,571
Non-cash investing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 677 $ 166