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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash flows from operating activities:      
Net income (loss) $ (157,957) $ (22,862) $ 6,820
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Stock-based compensation 21,736 27,403 21,013
Depreciation 10,745 13,275 12,965
Amortization of intangible assets 29,341 41,962 37,138
Non-cash interest expense and amortization of convertible debt issuance costs 9,243 7,578 6,749
Loss on extinguishment of debt 0 1,082 0
Impairment of in-process research and development intangible asset 0 0 18,300
Change in contingent consideration liability 0 0 (6,845)
Deferred tax (benefit) provision 79,954 39,535 (7,116)
Excess Tax Benefit from Share-based Compensation, Operating Activities 0 0 (1,196)
Non-cash restructuring 670 0 0
Gain (Loss) on Disposition of Other Assets (1,266) 0 0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments (291) 0 0
Gain (Loss) on Sale of Equity Investments 67 0 0
Gain from sale of intellectual property and property, plant and equipment, net 395 227 0
Effect of Exchange Rate on assumed cash liability from acquisition 0 0 (1,558)
Change in operating assets and liabilities, net of effects of acquisitions:      
Accounts receivable (24,933) (1,110) 5,797
Increase (Decrease) in Unbilled Receivables 145,164 0 0
Prepaid expenses and other assets (4,084) 4,354 (6,205)
Inventories (1,856) 473 1,748
Accounts payable (2,268) (651) 2,373
Accrued salaries and benefits and other accrued liabilities (3,221) 4,703 (1,519)
Increase (Decrease) in Income Taxes Payable (14,550) 861 (175)
Deferred revenue 228 607 7,313
Net cash provided by operating activities 87,117 117,437 95,602
Cash flows from investing activities:      
Purchases of property, plant and equipment (10,762) (9,385) (8,556)
Payments to Acquire Intangible Assets 350 120 0
Purchases of marketable securities (282,117) (102,497) (54,869)
Maturities of marketable securities 223,079 32,048 110,081
Proceeds from sale of marketable securities 0 4,450 50,546
Proceeds from sale of intellectual property and property, plant and equipment, net 10 33 113
Proceeds from Sale of Other Assets 3,754 0 0
Proceeds from Sale of Available-for-sale Securities, Equity 1,350 0 0
Payments to Acquire Investments (3,000) 0 0
Acquisition of businesses, net of cash acquired 0 0 202,523
Net cash used in investing activities (68,036) (75,471) (105,208)
Cash flows from financing activities:      
Proceeds from Issuance of Senior Long-term Debt 0 172,500 0
Payments of Debt Issuance Costs 0 (3,277) 0
Payments for Hedge, Financing Activities 0 (33,523) 0
Proceeds from Issuance of Warrants 0 23,173 0
Repayment of senior convertible notes (81,207) (72,257) 0
Proceeds received from issuance of common stock under employee stock plans 11,402 15,826 15,436
Principal payments against financing lease obligation (1,080) (860) (661)
Payment of additional purchase consideration from acquisition 0 0 10,206
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program (50,033) (50,038) 0
Incremental tax benefits from stock-based compensation 0 0 1,196
Payments Related to Tax Withholding for Share-based Compensation (6,766) (5,099) (3,064)
Net cash provided by (used in) financing activities (127,684) 46,445 2,701
Effect of exchange rate changes on cash and cash equivalents (989) 2,139 (1,565)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (109,592)    
Net increase (decrease) in cash and cash equivalents   90,550 (8,470)
Cash and cash equivalents at beginning of year 225,844 135,294 143,764
Cash and cash equivalents at end of year 115,924 225,844 135,294
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents 116,252    
Cash paid during the period for:      
Interest 3,044 1,553 1,553
Income taxes, net of refunds 23,581 22,733 26,787
Non-cash investing and financing activities:      
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities $ 8,225 $ 1,092 $ 576