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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Cash flows from operating activities:    
Net Income (Loss) $ (51,046) $ 5,611
Adjustments to reconcile net income (loss) to net cash provided by operating activities:    
Stock-based compensation 9,402 13,205
Depreciation 5,529 6,722
Amortization of intangible assets 19,269 20,938
Non-cash interest expense and amortization of convertible debt issuance costs 5,396 3,523
Deferred income taxes (10,202) 514
Restructuring Costs 670 0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments 291 0
Gain (Loss) on Disposition of Assets Held for Sale (1,266) 0
(Gain) loss from disposal of property, plant and equipment 47 180
Change in operating assets and liabilities, net of impact of acquisitions:    
Accounts receivable (13,665) (13,152)
Unbilled Receivables 67,905 0
Prepaid expenses and other assets (2,615) 5,116
Inventories (1,040) 304
Accounts payable (798) (396)
Accrued salaries and benefits and other liabilities 4,780 499
Increase (Decrease) in Income Taxes Payable (5,204) (4,621)
Deferred revenue (6,441) 4,090
Net cash provided by operating activities 20,430 42,533
Cash flows from investing activities:    
Purchases of property, plant and equipment (5,287) (3,482)
Purchases of marketable securities (79,207) 0
Maturities of marketable securities 131,823 32,048
Proceeds from Sale of Available-for-sale Securities, Equity 1,350 0
Proceeds from Sale of Available-for-sale Securities 0 4,450
Proceeds from Sale of Assets Held for Sale 3,754 0
Proceeds from sale of property, plant, and equipment 10 17
Net cash provided by investing activities 52,443 33,033
Cash flows from financing activities:    
Proceeds received from issuance of common stock under employee stock plans 5,850 8,345
Principal payments against lease financing obligation (499) (395)
Payments Related to Tax Withholding for Share-based Compensation (5,195) (2,824)
Payments for Repurchase of Common Stock (50,031) (50,036)
Net cash used in financing activities (49,875) (44,910)
Effect of Exchange Rate on Cash and Cash Equivalents (558) 1,257
Net increase in cash and cash equivalents 22,440 31,913
Cash and cash equivalents at beginning of period 225,844 135,294
Cash and cash equivalents at end of period 248,284 167,207
Non-cash investing and financing activities during the period:    
Property, plant and equipment received and accrued in accounts payable and other liabilities $ 1,793 $ 176