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Fair Value of Assets and Liabilities (Details) $ in Thousands | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
May. 31, 2015 USD ($) property | Sep. 30, 2015 USD ($) property building item shares | Apr. 30, 2015 shares | Dec. 31, 2014 USD ($)
Assets and liabilities measured at fair value |  |  |  |
Number of properties classified as held for sale | property |  | 1 |  |
Number of buildings classified as held for sale | building |  | 1 |  |
Cumulative impairments of properties held for sale |  | $ 2,283 |  |
Carrying value of assets held for sale |  | $ 4,703 |  |
Number of additional properties classified as held for sale | property |  | 1 |  |
Number of additional buildings classified as held for sale | building |  | 1 |  |
Number of public issues of unsecured senior notes | item |  | 6 |  |
Senior notes |  | $ 1,744,694 |  | $ 1,743,628
Excess of fair value over aggregate book value |  | 66,116 |  |
Secured Debt |  | 723,170 |  |
Excess of fair value over aggregate book value |  | $ 60,036 |  |
CommonWealth REIT (EQC) |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investment in common shares | shares |  |  | 250,000 |
Five Star |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investment in common shares | shares |  | 4,235,000 |  |
Acquisition |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Number of properties acquired | property |  | 23 |  |
Significant Unobservable Inputs (Level 3) | Acquisition | Senior Living Leased Community |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Other liabilities recorded | $ 1,000 |  |  |
Significant Unobservable Inputs (Level 3) | Acquisition | Senior Living Leased Community | Georgia |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Number of properties acquired | property | 1 |  |  |
Real Estate Aggregate Purchase Price | $ 9,750 |  |  |
Nonrecurring |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Assets held for sale |  | $ 374 |  |
Additional purchase consideration |  | 1,000 |  |
Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Assets held for sale |  | 374 |  |
Additional purchase consideration |  | 1,000 |  |
Recurring |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investments in available for sale securities |  | 13,086 |  |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |  |
Assets and liabilities measured at fair value |  |  |  |
Investments in available for sale securities |  | $ 13,086 |  |

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