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Discontinued Operations and Assets Held for Sale - Summarized operating results of the Discontinued Operations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Costs and Expenses [Abstract]      
(Loss) income from discontinued operations, net of tax expense of $114,257, $33,681 and $105,880, respectively $ (298,104) $ 1,088,147 $ 562,247
Discontinued Operations, Held-for-sale or Disposed of by Sale      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues 1,674,602 2,539,995 3,075,320
Costs and Expenses [Abstract]      
Depreciation and amortization expense (60,378) (111,376) (155,430)
Share-based compensation expense (3,050) (2,669) (4,217)
Other direct costs (1,313,258) (2,026,187) (2,436,416)
Loss on impairment of assets (438,258) (691) (13,112)
Other non-operating expense (68,553) (70,719) (91,132)
(Loss) income from discontinued operations, net of tax expense of $114,257, $33,681 and $105,880, respectively 25,048 793,475 293,114
Pretax (loss) income of discontinued operations (183,847) 1,121,828 668,127
Income tax expense (114,257) (33,681) (105,880)
(Loss) income from discontinued operations, net of tax (298,104) 1,088,147 562,247
Operating cash flows of discontinued operations 288,271 315,406 396,042
Investing cash flows of discontinued operations (48,428) (99,725) (169,082)
Financing cash flows of discontinued operations $ (969) $ (103,583) $ (61,622)