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CONSOLIDATED STATEMENTS OF CASH FLOWS
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Statement of Cash Flows [Abstract]      
Restricted Cash, Current $ 342 $ 328 $ 0
Cash flows from operating activities:      
Net income (loss) (90,419) (157,957) (22,862)
Adjustments to reconcile net loss to net cash provided by operating activities:      
Stock-based compensation 26,476 21,736 27,403
Depreciation expense and amortization of operating leases' right of use assets 23,507 10,745 13,275
Amortization of intangible assets 17,058 29,341 41,962
Non-cash interest expense and amortization of convertible debt issuance costs 6,854 9,243 7,578
Loss on extinguishment of debt 0 0 1,082
Deferred tax (benefit) provision (1,816) 79,954 39,535
Non-cash restructuring 0 670 0
Loss from divestiture 7,439 0 0
Gain (Loss) on Disposition of Other Assets 0 (1,266) 0
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments 0 (291) 0
Gain (Loss) on Sale of Equity Investments 696 67 0
Gain from sale of intellectual property and property, plant and equipment, net 157 395 227
Change in operating assets and liabilities, net of effects of acquisitions and divestiture:      
Accounts receivable 4,994 (24,933) (1,110)
Increase (Decrease) in Unbilled Receivables 151,513 145,164 0
Prepaid expenses and other assets 4,064 (4,084) 4,354
Inventories (3,353) (1,856) 473
Accounts payable 2,934 (2,268) (651)
Accrued salaries and benefits and other accrued liabilities 7,135 (3,221) 4,703
Increase (Decrease) in Income Taxes Payable (15,925) (14,550) 861
Deferred revenue (3,497) 228 607
Increase (decrease) in operating lease liabilities (9,282) 0 0
Net cash provided by operating activities 128,535 87,117 117,437
Cash flows from investing activities:      
Purchases of property, plant and equipment (6,472) (10,762) (9,385)
Payments to Acquire Intangible Assets 0 350 120
Purchases of marketable securities (657,433) (282,117) (102,497)
Maturities of marketable securities 507,385 223,079 32,048
Proceeds from sale of marketable securities 6,758 0 4,450
Proceeds from sale of intellectual property and property, plant and equipment, net 29 10 33
Proceeds from Divestiture of Businesses, Net of Cash Divested 76,039 0 0
Proceeds from Sale of Other Assets 0 3,754 0
Proceeds from Sale of Available-for-sale Securities, Equity 0 1,350 0
Payments to Acquire Investments (1,000) (3,000) 0
Acquisition of businesses, net of cash acquired (66,780) 0 0
Net cash used in investing activities (141,474) (68,036) (75,471)
Cash flows from financing activities:      
Proceeds from Issuance of Senior Long-term Debt 0 0 172,500
Payments of Debt Issuance Costs 0 0 (3,277)
Payments for Hedge, Financing Activities 0 0 (33,523)
Proceeds from Issuance of Warrants 0 0 23,173
Repayment of senior convertible notes 0 (81,207) (72,257)
Proceeds received from issuance of common stock under employee stock plans 15,104 11,402 15,826
Payments under Installment (8,379) 0 0
Principal payments against financing lease obligation 0 (1,080) (860)
Repurchase and retirement of common stock, including prepayment under accelerated share repurchase program 0 (50,033) (50,038)
Payments Related to Tax Withholding for Share-based Compensation (7,023) (6,766) (5,099)
Net cash provided by (used in) financing activities (298) (127,684) 46,445
Effect of exchange rate changes on cash and cash equivalents (497) (989) 2,139
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect (13,734) (109,592) 90,550
Cash, cash equivalents and restricted cash at beginning of year 116,252 225,844 135,294
Cash, cash equivalents and restricted cash at end of year 102,518 116,252 225,844
Cash paid during the period for:      
Interest 2,372 3,044 1,553
Income taxes, net of refunds 17,835 23,581 22,733
Non-cash investing and financing activities:      
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities $ 29,844 $ 8,225 $ 1,092