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Held for Sale and Discontinued Operations Schedule of Cash Flows of Discontinued Operations Related to DMG (Details) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Net cash provided by operating activities from discontinued operations $ 112,683 $ 101,215
Net cash used in investing activities from discontinued operations $ (20,982) $ (85,289)