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Related Person Transactions (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 1 Months Ended | 3 Months Ended | 0 Months Ended | 3 Months Ended |  |  | 3 Months Ended | 1 Months Ended | 3 Months Ended |  | 3 Months Ended | 1 Months Ended |  | 1 Months Ended | 3 Months Ended |
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Jan. 31, 2013 | Mar. 31, 2013 item | Mar. 31, 2012 | Apr. 16, 2013 Agreement to acquire Senior living communities Cumming, GA item | Mar. 27, 2013 RMR | Mar. 31, 2013 RMR item | Mar. 31, 2012 RMR | Mar. 31, 2013 Five Star item | Mar. 31, 2012 Five Star | Dec. 31, 2012 Five Star | May 31, 2011 Five Star | Mar. 31, 2013 Five Star AL Pooling Agreement item | Aug. 31, 2012 Five Star IL Pooling Agreement item | Mar. 31, 2013 Five Star Senior living communities item | Mar. 31, 2013 Five Star Rehabilitation hospitals item | Mar. 31, 2013 Five Star Acquisition | May 31, 2011 Five Star Acquisition Senior living communities item | Mar. 31, 2013 Five Star Acquisition Senior living communities New York item | Jun. 30, 2012 AIC | Mar. 31, 2013 AIC | Mar. 31, 2012 AIC | Dec. 31, 2012 AIC
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreements to avail management and administrative services |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Managing Trustees also serving as managing trustee of Five Star |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business management agreement expense |  |  |  |  |  | $ 6,550 | $ 6,360 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued in payment of an incentive fee for services rendered from RMR |  |  |  |  | 21,968 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common shares issued in public offering | 11,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net proceeds from issuance of common shares issued in public offering | 262,068 | 261,859 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Management fees payable under property management agreement as a percentage of gross rents |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |
Property management agreement expense |  |  |  |  |  | 1,600 | 1,399 | 2,295 | 1,068 |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership of common shares (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in common shares |  |  |  |  |  |  |  | 4,235,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total shares outstanding |  |  |  |  |  |  |  | 8.80% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  |  |  |  |  |  |  |  |  |  |  |  | 188 | 2 |  |  |  |  |  |  |
Minimum annual rent payable to entity |  |  |  |  |  |  |  | 198,357 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rental income recognized |  |  |  |  |  |  |  | 49,444 | 48,811 |  |  |  |  |  |  |  |  |  |  |  |  |
Rents receivable |  |  |  |  |  |  |  | 17,620 |  | 17,680 |  |  |  |  |  |  |  |  |  |  |  |
Deferred percentage rent |  |  |  |  |  |  |  | 1,254 | 1,211 |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements purchased |  |  |  |  |  |  |  | 8,171 |  |  |  |  |  |  |  | 8,171 |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  |  |  |  | 654 |  |  |  |  |  |  |  | 656 |  |  |  |  |  |
Number of pooling agreement |  |  |  |  |  |  |  | 3 |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Number of communities that include assisted living units |  |  |  |  |  |  |  |  |  |  |  | 20 |  |  |  |  |  |  |  |  |  |
Number of communities that include independent living units |  |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Number of properties acquired, referred to as managed properties |  |  |  |  |  |  |  |  |  |  |  |  |  | 39 |  |  |  |  |  |  |  |
Number of living units |  |  |  | 93 |  |  |  |  |  |  |  |  |  |  |  |  |  | 310 |  |  |  |
Aggregate purchase price of properties acquired, excluding closing costs |  |  |  | 22,030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount agreed to be lent under Bridge Loan Agreement |  |  |  |  |  |  |  |  |  |  | 80,000 |  |  |  |  |  |  |  |  |  |  |
Interest and other income |  | 173 | 482 |  |  |  |  |  | 275 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of other shareholders in the equity method investee company |  | 5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage held by us, RMR, Five Star, CWH and four other companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12.50% |  |
The entity owns less than this percentage of an equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |
Number of properties acquired or agreed to be acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6 |  |  |  |  |
Amount invested in equity investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,209 |  |
Equity method investments, carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,697 |  | 5,629
Earnings and losses recognized related to equity investments |  | 76 | 45 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 76 | 45 |
Period for which property insurance program was extended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Coverage of property insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |
Total premiums including taxes and fees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,438 |  |  |

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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33749-111570 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 6 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 19 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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