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Fair Value of Assets and Liabilities - Assets (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unrealized gain on equity securities | $ 22,932 | $ 27,241
Five Star |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities investment (in shares) | 4,235,000 |
Recurring | RMR Inc |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in affiliates, fair value | $ 160,830 |
Recurring | Five Star |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investments in affiliates, fair value | 4,129 |
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 | 160,830 |
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 | 4,129 |
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 |
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 |
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 |
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 |
Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Real estate properties held for sale | 7,489 |
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 |
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 | 7,489 |
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 |
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 |
Historical cost basis for shares owned | $ 69,826 |
Unrealized gain on equity securities | $ 20,836 |
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 |
Historical cost basis for shares owned | $ 6,353 |
Unrealized gain on equity securities | $ 2,096 |

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