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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows from operating activities:    
Net Income (Loss) $ 5,611 $ 5,754
Adjustments to reconcile net income to net cash provided by operating activities:    
Stock-based compensation 13,205 9,913
Depreciation 6,722 5,965
Amortization of intangible assets 20,938 15,871
Non-cash interest expense and amortization of convertible debt issuance costs 3,523 3,326
Excess tax benefits from stock-based compensation, Operating Activities 0 (591)
Deferred income taxes 514 2,816
(Gain) loss from disposal of property, plant and equipment 180 (37)
Effect of Exchange Rate on assumed cash liability from acquisition 0 624
Change in operating assets and liabilities, net of impact of acquisitions:    
Accounts receivable (13,152) 14,809
Prepaid expenses and other assets 5,116 (1,319)
Inventories 304 (537)
Accounts payable (396) 2,167
Accrued salaries and benefits and other liabilities (4,122) (9,046)
Deferred revenue 4,090 1,794
Net cash provided by operating activities 42,533 50,261
Cash flows from investing activities:    
Purchases of property, plant and equipment (3,482) (3,557)
Purchases of marketable securities 0 54,869
Maturities of marketable securities 32,048 81,971
Proceeds from sale of marketable securities 4,450 44,546
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 33,033 (12,432)
Cash flows from financing activities:    
Excess tax benefits from stock-based compensation, Financing Activities 0 591
Proceeds received from issuance of common stock under employee stock plans 8,345 8,259
Principal payments against lease financing obligation (395) (295)
Payments Related to Tax Withholding for Share-based Compensation (2,824) (1,572)
Payments for Repurchase of Common Stock (50,036) 0
Net cash provided by (used in) financing activities (44,910) 6,983
Effect of Exchange Rate on Cash and Cash Equivalents 1,257 (565)
Net increase in cash and cash equivalents 31,913 44,247
Cash and cash equivalents at beginning of period 135,294 143,764
Cash and cash equivalents at end of period 167,207 188,011
Non-cash investing and financing activities during the period:    
Assumed cash liability from acquisition 0 11,476
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 176 $ 246