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Fair Value of Assets and Liabilities (Details) (USD $) In Thousands, except Share data, unless otherwise specified | Jun. 30, 2014 item property | Dec. 31, 2013
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Assets and liabilities measured at fair value |  |
Number of properties classified as held for sale | 9 |
Cumulative impairments of properties held for sale | $ 22,545 |
Number of public issues of unsecured senior notes | 6 |
Senior notes | 1,742,893 | 1,093,337
Excess of fair value over aggregate book value | 84,860 |
CommonWealth REIT (EQC) |  |
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 | 13,249 |
Investments in available for sale securities | 27,797 |
Unsecured senior notes | 1,827,753 |
Secured debt | 735,341 |
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 | 27,797 |
Unsecured senior notes | 1,827,753 |
Recurring and Nonrecurring | Significant Other Observable Inputs (Level 2) |  |
Assets and liabilities measured at fair value |  |
Assets held for sale | 13,249 |
Recurring and Nonrecurring | Significant Unobservable Inputs (Level 3) |  |
Assets and liabilities measured at fair value |  |
Secured debt | $ 735,341 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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