Supplemental Balance Sheet and Income Statement Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense	$ 41,714	$ 51,206	$ 84,689	$ 105,928
General and administrative expenses	51,580	46,244	106,240	103,628
Income (loss) from continuing operations before income taxes	(165,684)	(133,522)	(284,288)	(490,098)
Tax expense (benefit)	24,719	4,446	34,444	22,139
Net income (loss)	(190,395)	(137,945)	(318,705)	(512,307)
Reclassification out of Accumulated Other Comprehensive Income
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense		142		284
General and administrative expenses	52	52	104	104
Income (loss) from continuing operations before income taxes	(52)	(194)	(104)	(388)
Tax expense (benefit)	(12)	(47)	(24)	(94)
Net income (loss)	$ (40)	$ (147)	$ (80)	$ (294)