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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	$ 151,430	$ 164,793	$ 635,223	$ 682,079
Depreciation and amortization	6,321	15,994	26,632	46,885
Share-based compensation expense	173	679	920	1,755
Other direct costs	176,686	178,675	526,706	560,028
Operating income	(31,750)	(30,555)	80,965	73,411
Other non-operating expense	(5,621)	(4,425)	(18,794)	(14,239)
Pretax income of discontinued operations	(37,371)	(34,980)	62,171	59,172
Income tax expense	2,905	(1,329)	(39,712)	(15,125)
Income (loss) from discontinued operations, net of tax	$ (34,466)	$ (36,309)	22,459	44,047
Operating cash flows of discontinued operations			148,251	153,707
Investing cash flows of discontinued operations			(38,876)	(25,056)
Financing cash flows of discontinued operations			$ (15,284)	$ (34,909)

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) 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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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