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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Cash Flows from Operating Activities      
Net income (loss) $ (8,391) $ (78,733) $ (407,088)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:      
Depreciation and amortization 30,697 34,399 49,998
Non-cash interest expense 13,792 12,676 11,762
Deferred income taxes (299) 360 (27,620)
Share-based compensation expense 12,703 15,270 16,074
Loss on extinguishment of debt 7,841    
Asset impairment 281 4,020 375,172
Impairment of equity investments 0 20,973 0
Provision for bad debts 140 392  
Changes in operating assets and liabilities:      
Accounts receivable and contract assets (30,361) 5,796 21,821
Inventories and deferred cost of sales (11,528) 14,969 (24,678)
Prepaid expenses and other current assets (2,610) 7,520 11,216
Accounts payable and accrued expenses 15,959 (26,945) (19,672)
Customer deposits and deferred revenue 12,424 (17,866) (39,296)
Income taxes receivable and payable, net 86 (655) (4,800)
Other, net 2,287 408 (627)
Net cash provided by (used in) operating activities 43,021 (7,416) (37,738)
Cash Flows from Investing Activities      
Capital expenditures (6,802) (10,873) (12,654)
Proceeds from the sale of investments 173,530 127,349 90,065
Payments for purchases of investments (248,023) (192,988) (93,046)
Proceeds from held for sale assets, net of costs to sell 9,503 645  
Acquisitions of businesses, net of cash acquired     (2,662)
Net cash provided by (used in) investing activities (71,792) (75,867) (18,297)
Cash Flows from Financing Activities      
Proceeds from issuance of 2025 Notes and 2027 Notes, net of issuance costs 120,095    
Purchase of capped calls (10,313)    
Repurchase of 2023 Notes (81,240)    
Proceeds (net of tax withholdings) from option exercises and employee stock purchase plan 2,878 3,106 3,064
Restricted stock tax withholdings (2,322) (2,980) (3,069)
Purchases of common stock     (11,457)
Net cash provided by (used in) financing activities 29,098 126 (11,462)
Effect of exchange rate changes on cash and cash equivalents 5 26 (4)
Net increase (decrease) in cash, cash equivalents, and restricted cash 332 (83,131) (67,501)
Cash, cash equivalents, and restricted cash - beginning of period 129,951 213,082 280,583
Cash, cash equivalents, and restricted cash - end of period 130,283 129,951 213,082
Supplemental Disclosure of Cash Flow Information      
Interest paid 12,700 9,408 9,708
Income taxes paid 329 2,931 4,799
Non-cash operating and financing activities      
Net transfer of property, plant and equipment to inventory 1,624 (4,916) $ (1,479)
Right-of-use assets obtained in exchange for lease obligations $ 1,741 $ 5,576