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Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2014 property item | Dec. 31, 2013
Assets and liabilities measured at fair value |  |  |
Number of properties classified as held for sale |  | 13 |
Cumulative impairments of properties held for sale |  | $ 41,911 |
Number of properties in long-lived assets held and used |  | 1 |
Impairment of assets charge related to long-lived assets held and used | 1,304 |  |
Number of public issues of unsecured senior notes |  | 4 |
Senior notes |  | 1,093,658 | 1,093,337
Excess of fair value over aggregate book value |  | 36,685 |
CommonWealth REIT (CWH) |  |  |
Assets and liabilities measured at fair value |  |  |
Investment in common shares |  | 250,000 |
Five Star |  |  |
Assets and liabilities measured at fair value |  |  |
Investment in common shares |  | 4,235,000 |
Recurring and Nonrecurring | Total |  |  |
Assets and liabilities measured at fair value |  |  |
Assets held for sale |  | 25,644 |
Long-lived assets held and used |  | 653 |
Investments in available for sale securities |  | 27,157 |
Unsecured senior notes |  | 1,130,343 |
Secured debt |  | 753,953 |
Recurring and Nonrecurring | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets and liabilities measured at fair value |  |  |
Investments in available for sale securities |  | 27,157 |
Unsecured senior notes |  | 1,130,343 |
Recurring and Nonrecurring | Significant Other Observable Inputs (Level 2) |  |  |
Assets and liabilities measured at fair value |  |  |
Assets held for sale |  | 25,644 |
Long-lived assets held and used |  | 653 |
Recurring and Nonrecurring | Significant Unobservable Inputs (Level 3) |  |  |
Assets and liabilities measured at fair value |  |  |
Secured debt |  | $ 753,953 |

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