Supplemental Balance Sheet and Income Statement Information - Reclass Accumulated Other (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense	$ 42,975	$ 54,722
General and administrative expenses	54,660	57,384
Income (loss) from continuing operations before income taxes	(118,604)	(356,576)
Tax expense (benefit)	9,725	17,693
Net income (loss)	(128,310)	(374,362)
Reclassification out of Accumulated Other Comprehensive Income
Unrealized (gains) losses on available-for-sale securities that were reclassified from net income
Interest expense		142
General and administrative expenses	52	52
Income (loss) from continuing operations before income taxes	(52)	(194)
Tax expense (benefit)	(12)	(47)
Net income (loss)	$ (40)	$ (147)