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Held for Sale and Discontinued Operations Schedule of Financial Results of DMG's Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (loss) income from discontinued operations, net of tax	$ (5,786)	$ 6,433
DMG | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	1,227,932	1,086,985
Expenses	1,226,407	1,074,452
Income from discontinued operations before taxes	1,525	12,533
Income tax expense	$ 7,311	$ 6,100

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