Discontinued Operations and Assets Held for Sale - Summarized operating results of the Discontinued Operations (Details) - Discontinued Operations - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 25,550	$ 157,347	$ 58,796	$ 380,686
Depreciation and amortization	0	399	0	834
Share-based compensation expense	6	106	9	269
Loss on impairment of assets	9,967	0	9,967	0
Other direct costs	23,274	126,202	50,822	278,639
Operating (loss) income	(7,697)	30,640	(2,002)	100,944
Other non-operating (loss) income	(2,565)	3,362	(10,582)	6,528
Pretax (loss) income of discontinued operations	(10,262)	34,002	(12,584)	107,472
Income tax expense	1,909	3,722	3,391	13,863
(Loss) income from discontinued operations, net of tax	$ (12,171)	$ 30,280	(15,975)	93,609
Operating cash flows of discontinued operations			(4,708)	31,309
Investing cash flows of discontinued operations			(551)	(11,561)
Financing cash flows of discontinued operations			$ (1,856)	$ (31,964)

Disposal Group, Including Discontinued Operation, Asset Impairment Charges

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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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Amount of tax expense (benefit) attributable to income (loss) from operations classified as a discontinued operation. Excludes tax expense (benefit) for gain (loss) on disposal and for provision for gain (loss) until disposal.

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