Discontinued Operations and Assets Held for Sale - Summarized operating results of the Discontinued Operations (Details) - Discontinued Operations - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 459,442	$ 561,748	$ 1,342,298	$ 1,952,952
Depreciation and amortization	13,656	28,523	60,168	84,666
Share-based compensation expense	1,045	334	2,378	2,044
Loss on impairment of assets	208,040	25,000	639,319	25,222
Other direct costs	340,657	468,573	1,070,363	1,572,733
Operating (loss) income	(103,956)	39,318	(429,930)	268,287
Other non-operating loss	(14,731)	(32,402)	(79,807)	(45,278)
Pretax (loss) income of discontinued operations	(118,687)	6,916	(509,737)	223,009
Income tax (expense) benefit	51,081	(24,070)	48,214	(17,364)
(Loss) income from discontinued operations, net of tax	$ (169,768)	$ 30,986	(557,951)	240,373
Operating cash flows of discontinued operations			248,972	313,647
Investing cash flows of discontinued operations			(40,578)	(69,653)
Financing cash flows of discontinued operations			$ 8,725	$ (68,824)

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Disposal Group, Including Discontinued Operation, Nonoperating Income (Expense)

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Disposal Group Including Discontinued Operation, Share-Based Compensation Expense

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Amount of cash inflow (outflow) of financing activities of discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) of investing activities of discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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