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Fair Value of Assets and Liabilities (Details) $ in Thousands | Sep. 30, 2016 USD ($) note property shares | Jun. 30, 2016 property | Dec. 31, 2015 USD ($)
--- | --- | --- | ---
Assets and liabilities measured at fair value |  |  |
Number of public issues of unsecured senior notes | note | 6 |  |
Senior unsecured notes | $ 1,722,032 |  | $ 1,478,536
Secured mortgage debt and capital leases | 1,168,827 |  | 679,295
Carrying value |  |  |
Assets and liabilities measured at fair value |  |  |
Senior unsecured notes | 1,722,032 |  | 1,478,536
Secured mortgage debt and capital leases | 1,168,827 |  | 679,295
Debt Instrument | 2,890,859 |  | 2,157,831
Fair value |  |  |
Assets and liabilities measured at fair value |  |  |
Senior unsecured notes | 1,830,935 |  | 1,548,613
Secured mortgage debt and capital leases | 1,195,240 |  | 724,615
Debt Instrument | $ 3,026,175 |  | $ 2,273,228
MOBs |  |  |
Assets and liabilities measured at fair value |  |  |
Number of properties classified as held for sale | property | 2 | 5 |
Five Star |  |  |
Assets and liabilities measured at fair value |  |  |
Investment in common shares (in shares) | shares | 4,235,000 |  |
Five Star | Common Shares |  |  |
Assets and liabilities measured at fair value |  |  |
Investment in common shares (in shares) | shares | 4,235,000 |  |
Amount of investment acquired | $ 14,230 |  |
Unrealized loss | $ 6,141 |  |
RMR Inc | Class A common shares |  |  |
Assets and liabilities measured at fair value |  |  |
Investment in common shares (in shares) | shares | 2,637,408 |  |
Amount of investment acquired | $ 69,826 |  |
Unrealized gain | 30,237 |  |
Recurring |  |  |
Assets and liabilities measured at fair value |  |  |
Investments in available for sale securities | 108,152 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets and liabilities measured at fair value |  |  |
Investments in available for sale securities | 108,152 |  |
Recurring | Significant Unobservable Inputs (Level 3) |  |  |
Assets and liabilities measured at fair value |  |  |
Investments in available for sale securities | 0 |  |
Nonrecurring |  |  |
Assets and liabilities measured at fair value |  |  |
Assets held for sale | 3,627 |  |
Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets and liabilities measured at fair value |  |  |
Assets held for sale | 0 |  |
Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |
Assets and liabilities measured at fair value |  |  |
Assets held for sale | $ 3,627 |  |

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