Discontinued Operations and Assets Held for Sale - Summarized operating results of the Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on sale of discontinued operations before taxes, net	$ 370,527	$ (513,390)	$ 456,770	$ (921,239)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	70,787	459,442	542,650	1,342,298
Depreciation and amortization expense	0	(13,656)	0	(60,168)
Share-based compensation expense	(371)	(1,045)	(1,198)	(2,378)
Other direct costs	(58,123)	(340,657)	(430,789)	(1,070,362)
Loss on impairment of assets	0	(10,275)	(1,268)	(431,587)
Other non-operating expense	(4,938)	(14,731)	(20,489)	(79,807)
Gain (loss) on sale of discontinued operations before taxes, net	612,010	(488,674)	625,304	(523,667)
Pretax income (loss) of discontinued operations	619,365	(409,596)	714,210	(825,671)
Income tax expense	(248,838)	(103,794)	(257,440)	(95,568)
Income (loss) from discontinued operations, net of tax	$ 370,527	$ (513,390)	456,770	(921,239)
Operating cash flows of discontinued operations			16,420	248,972
Investing cash flows of discontinued operations			(11,161)	(40,578)
Financing cash flows of discontinued operations			$ (18,054)	$ 8,725