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Held for Sale and Discontinued Operations Financial results for discontinued operations (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Goodwill and other asset impairment charges | $ 0 | $ 124,892 | $ 3,106
Valuation adjustment on disposal group | 0 | 0 | 316,840
Loss on sale of discontinued operations before taxes | (24,248) | (23,022) |
Net (loss) income from discontinued operations, net of tax | (9,653) | 105,483 | (457,038)
DMG - discontinued operations | Discontinued Operations, Held-for-sale |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Net revenues | 0 | 2,713,059 | 4,963,792
Expenses | 0 | 2,543,865 | 4,962,686
Goodwill and other asset impairment charges | 0 | 0 | 41,537
Valuation adjustment on disposal group | 0 | 0 | 316,840
Income (loss) from discontinued operations before taxes | 0 | 169,194 | (357,271)
Loss on sale of discontinued operations before taxes | (7,996) | (23,022) | 0
Income tax expense | $ 1,657 | $ 40,689 | $ 99,768

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