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Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Assets and liabilities measured at fair value |  |  |  |
Investments in available for sale securities | $ 115,612 | $ 115,612 | $ 51,472 |
Impairment of assets | 2,795 | 18,674 | 194 | $ (10)
Senior unsecured notes | 1,722,758 | 1,722,758 | 1,478,536 |
Recurring |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investments in available for sale securities | 115,612 | 115,612 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investments in available for sale securities | $ 115,612 | $ 115,612 |  |
Five Star |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investment in common shares | 4,235,000 | 4,235,000 |  |
Five Star | Common Shares |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investment in common shares | 4,235,000 | 4,235,000 |  |
Amount of investment acquired | $ 11,435 | $ 11,435 |  |
RMR Inc. | Class A common shares |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investment in common shares | 2,637,408 | 2,637,408 |  |
Amount of investment acquired | $ 69,826 | $ 69,826 |  |
Unrealized gain | 34,352 | 34,352 |  |
Carrying Amount |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Senior unsecured notes | 1,722,758 | 1,722,758 | 1,478,536 |
Secured debt | 1,106,183 | 1,106,183 | 667,138 |
Secured and secured debt | 2,828,941 | 2,828,941 | 2,145,674 |
Estimated Fair Value |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Senior unsecured notes | 1,755,715 | 1,755,715 | 1,548,613 |
Secured debt | 1,090,515 | 1,090,515 | 712,459 |
Secured and secured debt | $ 2,846,230 | $ 2,846,230 | $ 2,261,072 |

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