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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:    
Net income $ 2,999 $ 58,615
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 56,907 47,024
Non-cash interest expense, net 13,586 10,684
Non-cash change in fair-value 710 0
Gain on asset acquisition and sale of business (22,690) 0
Change in deferred revenue 875 9,822
Loss on extinguishment of debt 5,488 0
Deferred income taxes (8,014) (27,673)
Share-based compensation 6,017 4,875
Impairment of long-term investment 3,312 200
Loss on disposal of assets 119 8,176
Other 623 (2)
(Increase) decrease in assets:    
Receivables 11,659 36,861
Deferred charges and other assets (2,181) (63,783)
Increase (decrease) in liabilities:    
Accounts payable (2,547) 5,640
Accrued compensation and other expenses 6,428 (5,618)
Accrued taxes payable and other tax contingencies (1,315) 91,796
Net cash provided by operating activities 71,976 176,617
CASH FLOWS FROM INVESTING ACTIVITIES:    
Purchases of short-term investments (92,270) (142,562)
Sales of short-term investments 355,649 317,447
Purchases of property and equipment (3,062) (1,882)
Proceeds from sale of business 10,000 0
Capitalized patent costs (26,123) (23,845)
Acquisition of patents 0 (2,250)
Acquisition of business, net of cash acquired 0 (142,985)
Long-term investments 0 (6,686)
Net cash provided by (used in) investing activities 244,194 (2,763)
CASH FLOWS FROM FINANCING ACTIVITIES:    
Net proceeds from exercise of stock options 2 6,362
Payments on long-term debt (221,091) 0
Proceeds from issuance of convertible senior notes 400,000 0
Purchase of convertible bond hedge (72,000) 0
Payment for warrant unwind (4,184) 0
Prepayment penalty on long-term debt (10,763) 0
Proceeds from hedge unwind 9,038 0
Proceeds from issuance of warrants 47,600 0
Payments of debt issuance costs (8,375) 0
Proceeds from non-controlling interests 10,333 0
Dividends paid (33,683) (36,472)
Taxes withheld upon restricted stock unit vestings (4,316) (8,479)
Repurchase of common stock (171,269) (43,508)
Net cash used in financing activities (58,708) (82,097)
NET INCREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH 257,462 91,757
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD 488,733 433,014
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD $ 746,195 $ 524,771