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Leases and Management Agreements with Five Star (Tables) | 12 Months Ended
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Dec. 31, 2017
Risks and Uncertainties [Abstract] |
Schedule of Assets Leased and Revenues Earned | The following is a summary of the assets leased and revenues earned from Five Star as a tenant as of and for the years ended December 31, 2017 and 2016 compared to all our other assets and revenues from all sources:
|  | As of December 31, 2017 |  | As of December 31, 2016
|  | Carrying Value of Investment (1) |  | % of Total |  | Carrying Value of Investment (1) |  | % of Total
Five Star |  | $ | 2,330,630 |  |  | 27.5 | % |  | $ | 2,290,029 |  |  | 27.8 | %
All others |  | 6,144,320 |  |  | 72.5 | % |  | 5,961,935 |  |  | 72.2 | %
|  | $ | 8,474,950 |  |  | 100.0 | % |  | $ | 8,251,964 |  |  | 100.0 | %
(1) | Represents the gross book value of real estate assets before depreciation and purchase price allocations, less impairment write downs, if any. Five Star also manages our managed senior living communities. The carrying value of investment for those communities is included in the "All others" category.
|  | Year Ended |  | Year Ended
|  | December 31, 2017 |  | December 31, 2016
|  | Total Revenues(1) |  | % of Total |  | Total Revenues (1) |  | % of Total
Five Star |  | $ | 210,539 |  |  | 19.6 | % |  | $ | 203,581 |  |  | 19.2 | %
All others |  | 864,280 |  |  | 80.4 | % |  | 854,441 |  |  | 80.8 | %
|  | $ | 1,074,819 |  |  | 100.0 | % |  | $ | 1,058,022 |  |  | 100.0 | %
(1) | Five Star also manages our managed senior living communities. Our revenues from those communities are included in the “All others” category.

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + 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=84177426&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 21 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611 Reference 3: 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=77997519&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6442-108592 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592 Reference 6: 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=84177426&loc=d3e6404-108592 + Details
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