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Fair Value of Assets and Liabilities - Assets and Liabilities (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Jun. 26, 2019 | Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Other Liability | $ 197,788 |  | $ 197,788 |  |  | $ 219,653
Unrealized gain (loss) on equity securities | $ (64,448) | $ 23,265 | $ (41,516) | $ 50,506 |  |
Five Star |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities investment (in shares) | 4,235,000 |  | 4,235,000 |  |  |
Recurring | RMR Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | $ 123,905 |  | $ 123,905 |  |  |
Share price (in dollars per share) |  |  |  |  | $ 40.00 |
Recurring | Five Star |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | 1,953 |  | 1,953 |  |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | RMR Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | 123,905 |  | 123,905 |  |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Five Star |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | 1,953 |  | 1,953 |  |  |
Recurring | Significant Other Observable Inputs (Level 2) | RMR Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |  |  |
Recurring | Significant Other Observable Inputs (Level 2) | Five Star |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |  |  |
Recurring | Significant Unobservable Inputs (Level 3) | RMR Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |  |  |
Recurring | Significant Unobservable Inputs (Level 3) | Five Star |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Investments in affiliates, fair value | 0 |  | 0 |  |  |
Nonrecurring |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Real estate properties held for sale | 7,613 |  | 7,613 |  |  |
Other Liability | 18,409 |  | 18,409 |  |  |
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Real estate properties held for sale | 0 |  | 0 |  |  |
Other Liability | 0 |  | 0 |  |  |
Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Real estate properties held for sale | 7,613 |  | 7,613 |  |  |
Other Liability | 18,409 |  | 18,409 |  |  |
Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Real estate properties held for sale | 0 |  | 0 |  |  |
Other Liability | $ 0 |  | $ 0 |  |  |
Class A common shares | RMR Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities investment (in shares) | 2,637,408 |  | 2,637,408 |  |  |
Historical cost basis for shares owned | $ 69,826 |  | $ 69,826 |  |  |
Unrealized gain (loss) on equity securities | $ (36,925) |  | $ (16,089) |  |  |
Common Shares | Five Star |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Equity securities investment (in shares) | 4,235,000 |  | 4,235,000 |  |  |
Historical cost basis for shares owned | $ 6,353 |  | $ 6,353 |  |  |
Unrealized gain (loss) on equity securities | (2,176) |  | (80) |  |  |
Disposal Group, Held-for-sale, Not Discontinued Operations | Class A common shares | RMR Inc |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on equity securities | (18,409) |  | (18,409) |  |  |
Expense related to sale of investment | $ 6,938 |  | $ 6,938 |  |  |

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