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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net Income (Loss) $ (35,689) $ 3,006
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 7,514 6,596
Depreciation 2,942 3,392
Amortization of intangible assets 10,531 10,488
Non-cash interest expense and amortization of convertible debt issuance costs 2,680 1,749
Deferred income taxes (8,834) (214)
Restructuring Costs 670 0
Available-for-sale Securities, Gross Unrealized Gain (Loss) (155) 0
(Gain) loss from disposal of property, plant and equipment (45) (13)
Change in operating assets and liabilities, net of impact of acquisitions:    
Accounts receivable (761) (5,484)
Unbilled Receivables (47,778) 0
Prepaid expenses and other assets (2,236) 4,665
Inventories (595) (208)
Accounts payable (1,531) (978)
Accrued salaries and benefits and other liabilities (1,120) (4,943)
Increase (Decrease) in Income Taxes Payable (562) 241
Deferred revenue (3,817) (1,120)
Net cash provided by operating activities 16,770 17,177
Cash flows from investing activities:    
Purchases of property, plant and equipment (1,688) (1,918)
Purchases of marketable securities 79,207 0
Maturities of marketable securities 14,225 27,048
Proceeds from sale of property, plant, and equipment 10 17
Net cash provided by (used in) investing activities (66,660) 25,147
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 1,058 2,247
Principal payments against lease financing obligation (241) (190)
Payments Related to Tax Withholding for Share-based Compensation (4,893) (2,593)
Payments for Repurchase of Common Stock (50,000) 0
Net cash used in financing activities (54,076) (536)
Effect of Exchange Rate on Cash and Cash Equivalents 483 373
Net increase (decrease) in cash and cash equivalents (103,483) 42,161
Cash and cash equivalents at beginning of period 225,844 135,294
Cash and cash equivalents at end of period 122,361 177,455
Non-cash investing and financing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 286 $ 152