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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 65,316	$ 160,278	$ 446,002	$ 673,975
Depreciation and amortization	339	6,991	1,176	28,776
Share-based compensation expense	119	173	387	920
Loss on impairment of assets	25,000	0	25,000	0
Other direct costs	64,681	188,284	343,317	561,528
Operating income (loss)	(24,823)	(35,170)	76,122	82,751
Other non-operating income (loss)	(252)	(5,674)	6,276	(18,794)
Pretax income (loss) of discontinued operations	(25,075)	(40,844)	82,398	63,957
Income tax (expense) benefit	(2,062)	2,939	(15,926)	(40,406)
Income (loss) from discontinued operations, net of tax	$ (27,137)	$ (37,905)	66,472	23,551
Operating cash flows of discontinued operations			45,237	155,367
Investing cash flows of discontinued operations			(16,007)	(40,043)
Financing cash flows of discontinued operations			$ (44,984)	$ (17,306)

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

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Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. 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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