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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Mar. 31, 2019
Valuation Allowance [Line Items] |  |  |  |  |  |
Gross deferred federal, state and local tax expense (benefit) | $ (27,400) |  | $ 36,800 |  |  |
Gain on sale of assets | 2,209 | $ 579 | 374,019 | $ 2,723 |  |
Deferred federal, state and local tax benefit |  |  | (56,300) |  |  |
Increase (decrease) in valuation allowance | 40,000 |  | (39,500) |  |  |
Tax benefit |  | (19,400) |  | (40,700) |  |
Deferred tax asset related to employee compensation |  | 1,700 |  | 1,700 |  | $ 1,700
Valuation allowance | $ 369,400 |  | 369,400 |  | $ 408,900 |
Federal and State |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Deferred federal, state and local tax benefit |  | $ (19,400) |  | (39,000) |  |
ASC 842 |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | 13,800 |  |  |
Current operating loss |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | 78,100 | $ 39,400 |  |
CCRC Ventures, LLC |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Gain on sale of assets |  |  | 93,100 |  |  |
Healthpeak |  |  |  |  |  |
Valuation Allowance [Line Items] |  |  |  |  |  |
Increase (decrease) in valuation allowance |  |  | $ (117,600) |  |  |

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