Supplemental Balance Sheet and Income Statement Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense	$ 42,217	$ 52,403	$ 126,906	$ 158,331
General and administrative expenses	52,897	46,168	159,137	149,796
Income (loss) from continuing operations before income taxes	(112,918)	(150,377)	(397,206)	(640,475)
Tax expense (benefit)	2,784	(3,695)	37,228	18,444
Net income (loss)	(115,722)	(146,660)	(434,427)	(658,967)
Reclassification out of Accumulated Other Comprehensive Income
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense		(124)		160
General and administrative expenses	52	52	156	156
Income (loss) from continuing operations before income taxes	(52)	72	(156)	(316)
Tax expense (benefit)	(12)	(35)	(36)	(129)
Net income (loss)	$ (40)	$ 107	$ (120)	$ (187)