Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 18,930	$ 2,164
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	40,367	37,642
Non-cash interest expense, net	8,649	8,563
Non-cash change in fair-value	(5,501)	710
Gain on asset acquisition	0	(14,175)
Change in deferred revenue	(22,683)	(62,754)
Loss on extinguishment of debt	0	5,488
Deferred income taxes	(6,920)	(5,714)
Share-based compensation	6,631	4,212
Other	259	623
(Increase) decrease in assets:
Receivables	8,892	(22,169)
Deferred charges and other assets	(1,470)	(6,463)
Increase (decrease) in liabilities:
Accounts payable	(3,575)	(3,105)
Accrued compensation and other expenses	(760)	2,326
Accrued taxes payable and other tax contingencies	51	(871)
Net cash provided by (used in) operating activities	42,870	(53,523)
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of short-term investments	(120,977)	(92,074)
Sales of short-term investments	132,363	267,289
Purchases of property and equipment	(3,771)	(2,862)
Capitalized patent costs	(13,849)	(17,840)
Net cash provided by (used in) investing activities	(6,234)	154,513
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from exercise of stock options	1,792	2
Payments on long-term debt	(94,909)	(221,091)
Proceeds from issuance of convertible senior notes	0	400,000
Purchase of convertible bond hedge	0	(72,000)
Payment for warrant unwind	0	(4,184)
Prepayment penalty on long-term debt	0	(10,763)
Proceeds from hedge unwind	0	9,038
Proceeds from issuance of warrants	0	47,600
Payments of debt issuance costs	0	(7,300)
Proceeds from non-controlling interests	0	10,333
Dividends paid	(21,509)	(22,789)
Taxes withheld upon restricted stock unit vestings	(1,480)	(4,137)
Repurchase of common stock	(349)	(171,269)
Net cash used in financing activities	(116,455)	(46,560)
NET INCREASE (DECREASE) IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(79,819)	54,430
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	757,098	488,733
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	$ 677,279	$ 543,163

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