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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 211,053 $ 92,061 $ 42,188
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 77,792 78,571 78,193
Non-cash interest income (expense), net (18,601) 1,645 6,867
Non-cash change in fair value (10,130) 1,686 (7,649)
Change in deferred revenue (49,176) 85,403 (16,868)
Deferred income taxes (34,665) 18,518 (7,503)
Share-based compensation 35,741 22,127 28,736
Loss on extinguishment of debt 0 11,190 0
Impairment of assets 2,500 2,427 13,228
Other 415 0 0
(Increase) decrease in assets:      
Receivables (64,110) (22,069) (15,103)
Deferred charges and other assets 866 (13,453) (9,894)
(Decrease) Increase in liabilities:      
Accounts payable (2,513) 6,868 (1,803)
Accrued compensation and other expenses 64,561 1,065 20,000
Net cash provided by operating activities 213,733 286,039 130,392
CASH FLOWS FROM INVESTING ACTIVITIES:      
Purchases of short-term investments (836,370) (532,724) (527,800)
Sales of short-term investments 797,703 260,771 744,353
Purchases of property and equipment (4,268) (3,156) (2,511)
Capitalized patent costs (40,358) (39,597) (33,416)
Acquisition of patents 0 0 (2,350)
Long-term investments (1,877) 0 1,363
Net cash (used in) provided by investing activities (85,170) (314,706) 179,639
CASH FLOWS FROM FINANCING ACTIVITIES:      
Proceeds from issuance of convertible senior notes 0 460,000 0
Purchase of convertible bond hedge 0 (80,500) 0
Proceeds from issuance of warrants 0 43,700 0
Payments on long-term debt 0 (282,499) 0
Proceeds from bond hedge unwind 0 11,851 0
Payment for warrant unwind 0 (3,837) 0
Payments of debt issuance costs (100) (9,829) 0
Repurchase of common stock (339,704) (74,445) (30,000)
Net proceeds from exercise of stock options 1,252 1,226 7,950
Non-controlling interest contribution 1,750 1,500 100
Non-controlling interest distribution 0 0 (2,512)
Taxes withheld upon restricted stock unit vestings (12,507) (6,257) (6,950)
Dividends paid (39,454) (42,306) (43,058)
Net cash (used in) provided by financing activities (388,763) 18,604 (74,470)
NET (DECREASE) INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH (260,200) (10,063) 235,561
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 703,161 713,224 477,663
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 442,961 $ 703,161 $ 713,224