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Concentration of Credit Risk (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Concentration of Credit Risk. |  |  |
Investment | $ 7,456,940 | $ 6,222,360 |
Revenue | $ 630,899 | 526,703 | $ 459,380
Five Star | Senior Living Communities |  |  |
Concentration of Credit Risk. |  |  |
Number of properties acquired, referred to as managed properties | property | 60 |  |
Investment | Rents from significant lessee |  |  |
Concentration of Credit Risk. |  |  |
Investment | $ 7,456,940 | $ 6,238,611 |
% of Total (as a percent) | 100.00% | 100.00% |
Investment | Rents from significant lessee | Five Star |  |  |
Concentration of Credit Risk. |  |  |
Investment | $ 2,147,388 | $ 2,125,517 |
% of Total (as a percent) | 29.00% | 34.00% |
Investment | Rents from significant lessee | All others |  |  |
Concentration of Credit Risk. |  |  |
Investment | $ 5,309,552 | $ 4,113,094 |
% of Total (as a percent) | 71.00% | 66.00% |
Rental income | Rents from significant lessee |  |  |
Concentration of Credit Risk. |  |  |
Revenue | $ 630,899 | $ 526,703 |
% of Total (as a percent) | 100.00% | 100.00% |
Rental income | Rents from significant lessee | Five Star |  |  |
Concentration of Credit Risk. |  |  |
Revenue | $ 196,919 | $ 196,269 |
% of Total (as a percent) | 31.00% | 37.00% |
Rental income | Rents from significant lessee | All others |  |  |
Concentration of Credit Risk. |  |  |
Revenue | $ 433,980 | $ 330,434 |
% of Total (as a percent) | 69.00% | 63.00% |

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=51801978&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13537-108611 + Details
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