Held for Sale and Discontinued Operations Schedule of Financial Results of DMG's Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment charges	$ 3,106	$ 10,498	$ 3,106	$ 34,696	$ 36,196
Net income (loss) from discontinued operations, net of tax	69,696	(24,520)	63,910	(18,087)
DMG held for sale \| Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	1,252,430	1,196,066	2,480,362	2,283,050
Expenses	1,192,528	1,157,901	2,418,935	2,232,352
Goodwill impairment charges	0	50,619	0	50,619
Income (loss) from discontinued operations before taxes	59,902	(12,454)	61,427	79
Income tax benefit (expense)	$ 9,794	$ (12,066)	$ 2,483	$ (18,166)

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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