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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 6 Months Ended 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain (Loss) On Disposition Of Business Interests Before Tax     $ (16,252) $ (23,022)  
Net (loss) income from discontinued operations, net of tax $ 0 $ 79,392 9,980 109,697  
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 1,330,777 0 2,713,059  
Expenses 0 1,201,633 0 2,539,787  
(Loss) income from discontinued operations before taxes 0 129,144 0 173,272  
Gain (Loss) On Disposition Of Business Interests Before Tax 0 (23,022)   (23,022) $ (23,022)
Income tax expense $ 0 $ 26,730 0 $ 40,553  
Coronavirus Aid Relief And Economic Security Act Additional Tax Benefit | DMG held for sale | Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Gain (Loss) On Disposition Of Business Interests Before Tax     $ 9,980