Discontinued Operations and Assets Held for Sale - Summarized operating results of the Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	$ 86,661	$ (300,069)	$ 86,243	$ (407,849)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	232,114	513,372	471,863	882,856
Depreciation and amortization expense	0	(22,002)	0	(46,513)
Share-based compensation expense	(585)	(888)	(827)	(1,333)
Loss on impairment of assets	(204)	(421,312)	(1,268)	(421,312)
Other direct costs	(171,469)	(350,822)	(372,665)	(729,704)
Other non-operating expense	(4,389)	(10,020)	(15,551)	(65,076)
Gain (loss) on sale of discontinued operations before taxes, net	30,131	(11,440)	13,293	(34,993)
Pretax income (loss) of discontinued operations	85,598	(303,112)	94,845	(416,075)
Income tax (expense) benefit	1,063	3,043	(8,602)	8,226
Income (loss) from discontinued operations, net of tax	$ 86,661	$ (300,069)	86,243	(407,849)
Operating cash flows of discontinued operations			56,567	193,459
Investing cash flows of discontinued operations			(9,941)	(29,632)
Financing cash flows of discontinued operations			$ (18,059)	$ 14,135