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Related Person Transactions (Details) (USD $) | 3 Months Ended |  |  |  | 3 Months Ended |  | 3 Months Ended | 1 Months Ended | 3 Months Ended |  | 1 Months Ended | 3 Months Ended |  | 1 Months Ended
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Mar. 31, 2014 item property | Mar. 31, 2013 | Apr. 30, 2014 item | Mar. 31, 2014 Senior living communities item | Dec. 31, 2013 Senior living communities item | Mar. 31, 2014 Five Star item | Mar. 31, 2013 Five Star | Dec. 31, 2001 Five Star | Mar. 31, 2014 Five Star AL Pooling Agreement item | Mar. 31, 2014 Five Star IL Pooling Agreement item | Aug. 31, 2013 Five Star Senior living communities property item | Jun. 30, 2013 Five Star Senior living communities property | Mar. 31, 2014 Five Star Senior living communities item | Mar. 31, 2014 Five Star Acquisition Senior living communities New York item | Jan. 31, 2014 Five Star Sale Senior living communities property item | Aug. 31, 2013 Five Star Sale Senior living communities item | Jan. 31, 2014 Five Star Sale Senior living communities Texas item | Mar. 31, 2014 RMR item | Mar. 31, 2013 RMR | Mar. 31, 2014 AIC | Mar. 31, 2013 AIC | Dec. 31, 2013 AIC | Apr. 30, 2014 AIC Subsequent event
Related person transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial ownership of common shares (as a percent) |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in common shares |  |  |  |  |  | 4,235,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total shares outstanding |  |  |  |  |  | 8.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of real estate properties leased |  |  |  |  |  |  |  |  |  |  |  |  | 186 |  |  |  |  |  |  |  |  |  |
Minimum annual rent payable to entity |  |  |  |  |  | $ 190,614,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total rental income recognized |  |  |  |  |  | 47,506,000 | 49,444,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rents receivable |  |  |  |  |  | 15,835,000 | 17,620,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred estimated percentage rent |  |  |  |  |  | 1,416,000 | 1,254,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Real estate improvements purchased |  |  |  |  |  | 8,614,000 | 8,171,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable |  |  |  |  |  | 689,000 | 654,000 |  |  |  | 255,000 |  |  |  | 210,000 |  |  |  |  |  |  |  |
Number of properties agreed to be offered for sale | 13 |  |  | 9 | 10 |  |  |  |  |  | 10 |  | 9 |  |  |  |  |  |  |  |  |  |
Sale price of properties under agreement to be sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | 2,550,000 | 2,400,000 |  |  |  |  |  |
Number of properties sold or agreed to be sold |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | 1 |  | 36 |  |  |  |  |  |
Number of properties agreed to be sold |  |  |  |  |  |  |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |
Increase or decrease in annual lease rent payable as a percentage of net proceeds of the sale |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  | 8.75% |  |  |  |  |  |  |  |
Number of combination or pooling agreements |  |  |  |  |  | 4 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 44 |  |  |  |  |  |  |  |  |  |
Property management agreement expense |  |  |  |  |  | 2,425,000 | 2,295,000 |  |  |  |  |  |  |  |  |  |  | 1,638,000 | 1,600,000 |  |  |  |
Number of living units |  |  |  | 708 | 744 |  |  |  |  |  |  |  |  | 310 | 36 | 112 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,682,000 | 6,550,000 |  |  |  |
Common shares issued as payment for base business management fee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30,279 |  |  |  |  |
Base business management fee payable in common shares (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Number of other shareholders in the equity method investee company | 4 |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage held by the entity and other shareholders |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.30% |  |  | 14.30%
The entity owns less than this percentage of an equity method investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |
Amount invested in equity investee |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,209,000 |  |  |
Equity method investments, carrying value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,835,000 |  | 5,913,000 |
Earnings and losses recognized arising from equity investments | (97,000) | 76,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (97,000) | 76,000 |  |
Coverage of property insurance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000,000 |  |  |
Number of shares purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,857
Payments for share purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 825,000,000

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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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