Held for Sale and Discontinued Operations Schedule of Financial Results of DMG's Discontinued Operations (Details) - 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]
Net (loss) income from discontinued operations, net of tax	$ (6,843)	$ (211,739)	$ 102,854	$ (147,829)
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	0	1,252,909	2,713,059	3,733,270
Expenses	1,996	1,260,814	2,541,783	3,679,747
Valuation adjustment	0	98,201	0	98,201
(Loss) income from discontinued operations before taxes	(1,996)	(106,106)	171,276	(44,678)
Loss on sale of discontinued operations before taxes	0	0	(23,022)	0
Income tax expense	$ 4,847	$ 105,633	$ 45,400	$ 103,151

Disposal Group Including Discontinued Operations Valuation Adjustment.

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