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Held for Sale and Discontinued Operations Schedule of Cash Flows of Discontinued Operations Related to DMG (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Discontinued Operations and Disposal Groups [Abstract]    
Net cash provided by operating activities from discontinued operations $ 0 $ 103,848
Net cash used in investing activities from discontinued operations $ 0 $ (43,442)