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Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets and liabilities measured at fair value |  |
Senior unsecured notes | $ 1,723,484 | $ 1,722,758
Carrying value |  |
Assets and liabilities measured at fair value |  |
Senior unsecured notes | 1,723,484 | 1,722,758
Secured Debt | 1,103,518 | 1,106,183
Debt Instrument | 2,827,002 | 2,828,941
Fair value |  |
Assets and liabilities measured at fair value |  |
Senior unsecured notes | 1,806,912 | 1,755,715
Secured Debt | 1,101,363 | 1,090,515
Debt Instrument | $ 2,908,275 | $ 2,846,230
Five Star |  |
Assets and liabilities measured at fair value |  |
Investment in common shares (in shares) | 4,235,000 |
Five Star | Common Shares |  |
Assets and liabilities measured at fair value |  |
Investment in common shares (in shares) | 4,235,000 |
RMR Inc | Class A common shares |  |
Assets and liabilities measured at fair value |  |
Investment in common shares (in shares) | 2,637,408 |
Recurring |  |
Assets and liabilities measured at fair value |  |
Investments in available for sale securities | $ 139,657 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets and liabilities measured at fair value |  |
Investments in available for sale securities | 139,657 |
Recurring | Significant Unobservable Inputs (Level 3) |  |
Assets and liabilities measured at fair value |  |
Investments in available for sale securities | $ 0 |

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