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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Cash flows from operating activities:    
Net Income (Loss) $ 1,878 $ 9,502
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 4,864 3,766
Depreciation 2,969 3,227
Amortization of intangible assets 7,719 6,322
Non-cash interest expense and amortization of convertible debt issuance costs 1,651 1,559
Incremental tax benefits from stock-based compensation, Operating Activities (485) (182)
Deferred income taxes 1,142 644
Gain from sale of intellectual property and property, plant and equipment, net (37) (2,267)
Change in operating assets and liabilities:    
Accounts receivable 10,015 (540)
Prepaid expenses and other assets (2,398) (1,436)
Accounts payable 266 (965)
Accrued salaries and benefits and other liabilities (9,857) (5,959)
Income taxes payable (233) (86)
Deferred revenue (1,236) 1,272
Net cash provided by operating activities 16,258 14,857
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,599) (1,095)
Purchases of marketable securities 0 (46,779)
Maturities of marketable securities 54,585 40,070
Proceeds from sale of marketable securities 0 6,600
Proceeds from sale of intellectual property and property, plant and equipment 0 2,280
Acquisition of business, net of cash acquired (80,523) 0
Net cash provided by (used in) investing activities (27,537) 1,076
Cash flows from financing activities:    
Incremental tax benefits from stock-based compensation, Financing Activities 485 182
Proceeds received from issuance of common stock under employee stock plans 3,799 1,424
Principal payments against lease financing obligation (140) (98)
Net cash provided by financing activities 4,144 1,508
Net increase (decrease) in cash and cash equivalents (7,135) 17,441
Cash and cash equivalents at beginning of period 143,764 154,126
Cash and cash equivalents at end of period 136,629 171,567
Non-cash investing activities during the period:    
Assumed cash liability from acquisition 12,100 0
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 830 $ 248