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Income Taxes - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Section 1231 gain (loss) |  |  |  |  |  |  |  |  | $ 0 |  |  |
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 151,000,000 | $ 170,000,000 | $ 833,000,000 |
Income (loss) before income taxes | $ (2,866,000) | $ 13,957,000 | $ 78,182,000 | $ 128,410,000 | $ 149,329,000 | $ (19,062,000) | $ 25,708,000 | $ 20,345,000 | 217,683,000 | 176,320,000 | 838,577,000 |
Income tax benefit (expense) |  |  |  |  |  |  |  |  | 10,000,000 | 12,000,000 | 13,000,000 |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | (14,573,000) | (18,253,000) | (18,525,000) |
Net operating loss carryforward | 68,444,000 |  |  |  | 33,771,000 |  |  |  | 68,444,000 | 33,771,000 | 20,559,000 |
Unrecognized Tax Benefits | 469,000 |  |  |  | 469,000 |  |  |  | 469,000 | 469,000 | 0 | $ 0
Accrued interest | 70,000 |  |  |  |  |  |  |  | 70,000 |  |  |
Amount that tax basis of net assets is less than reported amounts | 1,500,000,000 |  |  |  | $ 1,200,000,000 |  |  |  | 1,500,000,000 | 1,200,000,000 | 1,400,000,000 |
UK |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  |  |  | (11,000,000) |
Down R E I T |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from continuing operations before income taxes |  |  |  |  |  |  |  |  | 80,000,000 | 200,000,000 | 852,000,000 |
TRS |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 71,000,000 | $ (30,000,000) | $ (8,000,000) |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  | 33,000,000 |  |  |
Net operating loss carryforward | 283,000,000 |  |  |  |  |  |  |  | 283,000,000 |  |  |
Net operating loss carryforwards subject to expiration | 22,000,000 |  |  |  |  |  |  |  | 22,000,000 |  |  |
Net operating loss carryforwards not subject to expiration | $ 261,000,000 |  |  |  |  |  |  |  | $ 261,000,000 |  |  |

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