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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) property shares | Dec. 31, 2018 USD ($) property shares | Dec. 31, 2017 USD ($)
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Unrealized gains (losses) on equity securities, net |  | $ (41,898) | $ (20,724) | $ 0
Impairment of assets |  | $ 115,201 | 66,346 | $ 5,082
Number of properties owned | property |  | 424 |  |
Five Star |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Unrealized gains (losses) on equity securities, net |  | $ (462) | $ (4,320) |
Impairment of assets | $ 5,082 |  |  |
Five Star | Common Shares |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Investment in common shares (in shares) | shares |  | 423,500 | 423,500 |
Cost basis for shares owned |  | $ 6,353 |  |
Recurring | Five Star |  |  |  |
Recurring Fair Value Measurements Assets: |  |  |  |
Investments in Five Star |  | 1,571 |  |
Recurring | Five Star | Level 1 |  |  |  |
Recurring Fair Value Measurements Assets: |  |  |  |
Investments in Five Star |  | 1,571 |  |
Recurring | Five Star | Level 2 |  |  |  |
Recurring Fair Value Measurements Assets: |  |  |  |
Investments in Five Star |  | 0 |  |
Recurring | Five Star | Level 3 |  |  |  |
Recurring Fair Value Measurements Assets: |  |  |  |
Investments in Five Star |  | 0 |  |
Nonrecurring |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Real estate properties held for sale |  | 88,656 |  |
Real estate properties at fair value |  | 106,850 |  |
Nonrecurring | Level 1 |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Real estate properties held for sale |  | 0 |  |
Real estate properties at fair value |  | 0 |  |
Nonrecurring | Level 2 |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Real estate properties held for sale |  | 88,656 |  |
Real estate properties at fair value |  | 0 |  |
Nonrecurring | Level 3 |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Real estate properties held for sale |  | 0 |  |
Office Portfolio |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Impairment of assets |  | $ 43,035 | $ 46,797 |
Number of properties owned | property |  | 20 |  |
Office Portfolio | Nonrecurring |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Sale price less estimated cost to sell |  | $ 71,121 |  |
Office Portfolio | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Number of real estate properties held for sale | property |  | 15 | 2 |
Office Portfolio | Disposal Group, Held-for-sale, Not Discontinued Operations | Nonrecurring |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Impairment of assets |  | $ 16,977 |  |
Number of real estate properties held for sale | property |  | 14 |  |
Sale price less estimated cost to sell |  | $ 2,141 |  |
Senior Living Communities |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Impairment of assets |  | $ 72,166 |  |
Number of properties owned | property |  | 25 |  |
Senior Living Communities | Nonrecurring |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Real estate properties at fair value |  | $ 106,850 |  |
Impairment of assets |  | 51,797 |  |
Sale price less estimated cost to sell |  | $ 17,535 |  |
Number of properties owned | property |  | 7 |  |
Senior Living Communities | Disposal Group, Held-for-sale, Not Discontinued Operations |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Number of real estate properties held for sale | property |  | 2 |  |
Senior Living Communities | Disposal Group, Held-for-sale, Not Discontinued Operations | Nonrecurring |  |  |  |
Non-Recurring Fair Value Measurements Assets: |  |  |  |
Impairment of assets |  | $ 4,984 |  |
Number of real estate properties held for sale | property |  | 2 |  |
Sale price less estimated cost to sell |  | $ 515 |  |

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