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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income (loss) $ 38,288 $ (2,839)
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 40,436 39,550
Non-cash interest expense, net 3,058 3,861
Non-cash change in fair-value (1,404) (949)
Change in deferred revenue (127,700) (86,659)
Loss on extinguishment of long-term debt 11,190 0
Deferred income taxes 9,850 (2,409)
Share-based compensation 9,363 5,928
Asset impairment 2,427 11,000
(Increase) Decrease in assets    
Receivables (17,688) 4,006
Deferred charges and other assets 1,434 (6,384)
Increase (Decrease) increase in liabilities:    
Accounts payable 5,701 (375)
Accrued compensation and other expenses (26,695) (1,831)
Net cash used in operating activities (51,740) (37,101)
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of short-term investments (1,929) (327,426)
Sales of short-term investments 166,729 354,165
Purchases of property and equipment (762) (937)
Capitalized patent costs (21,323) (20,228)
Long-term investments 0 (1,091)
Net cash provided by investing activities 142,715 4,483
CASH FLOWS FROM FINANCING ACTIVITIES:    
Proceeds from issuance of convertible senior notes 460,000 0
Purchase of convertible bond hedge (80,500) 0
Proceeds from issuance of warrants 43,700 0
Payments on long-term debt (282,499) 0
Proceeds from hedge unwind 11,851 0
Payment for warrant unwind (3,837) 0
Payments of debt issuance costs (8,726) 0
Repurchase of common stock (74,445) (11,141)
Net proceeds from exercise of stock options 1,226 4,369
Net proceeds from exercise of stock options 1,500 0
Non-controlling interest distribution 0 (1,109)
Taxes withheld upon restricted stock unit vestings (5,733) (3,673)
Dividends paid (21,544) (21,525)
Net cash provided by (used in) financing activities 40,993 (33,079)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 131,968 (65,697)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 713,224 477,663
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 845,192 $ 411,966