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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash flows from operating activities:    
Net Income (Loss) $ 3,006 $ 1,878
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 6,596 4,864
Depreciation 3,392 2,969
Amortization of intangible assets 10,488 7,719
Non-cash interest expense and amortization of convertible debt issuance costs 1,749 1,651
Excess tax benefits from stock-based compensation, Operating Activities 0 (485)
Deferred income taxes (214) 1,142
Gain from sale of intellectual property and property, plant and equipment, net (13) (37)
Change in operating assets and liabilities, net of impact of acquisitions:    
Accounts receivable (5,484) 10,015
Prepaid expenses and other assets 4,665 (1,560)
Inventories (208) (838)
Accounts payable (978) 266
Accrued salaries and benefits and other liabilities (4,702) (8,566)
Deferred revenue (1,120) (1,236)
Net cash provided by operating activities 17,177 17,782
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,918) (1,599)
Maturities of marketable securities 27,048 54,585
Proceeds from sale of property, plant and equipment 17 0
Acquisitions of businesses, net of cash acquired 0 (80,523)
Net cash provided by (used in) investing activities 25,147 (27,537)
Cash flows from financing activities:    
Excess tax benefits from stock-based compensation, Financing Activities 0 485
Proceeds received from issuance of common stock under employee stock plans 2,247 3,799
Principal payments against lease financing obligation (190) (140)
Payments Related to Tax Withholding for Share-based Compensation (2,593) (1,482)
Net cash provided by (used in) financing activities (536) 2,662
Effect of Exchange Rate on Cash and Cash Equivalents 373 (42)
Net increase (decrease) in cash and cash equivalents 42,161 (7,135)
Cash and cash equivalents at beginning of period 135,294 143,764
Cash and cash equivalents at end of period 177,455 136,629
Non-cash investing and financing activities during the period:    
Assumed cash liability from acquisition 0 12,100
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 152 $ 830