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Leases and Management Agreements with Five Star - Schedule of Assets Leased and Revenues Earned (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | $ 7,876,300 |  |  |  | $ 7,824,763 |  |  |  | $ 7,876,300 | $ 7,824,763 |
Total revenues | 285,222 | $ 278,969 | $ 277,202 | $ 275,770 | 278,543 | $ 266,673 | $ 264,992 | $ 264,521 | 1,117,164 | 1,074,729 | $ 1,058,022
Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | 8,428,644 |  |  |  | 8,474,950 |  |  |  | $ 8,428,644 | $ 8,474,950 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Sales Revenue, Services, Net | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 100.00% | 100.00% |
Total revenues |  |  |  |  |  |  |  |  | $ 1,117,164 | $ 1,074,819 |
Five Star | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | 2,253,853 |  |  |  | 2,330,630 |  |  |  | $ 2,253,853 | $ 2,330,630 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 26.70% | 27.50% |
Five Star | Sales Revenue, Services, Net | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 19.00% | 19.60% |
Total revenues |  |  |  |  |  |  |  |  | $ 212,622 | $ 210,539 |
All others | Real Estate Investment Property At Cost | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying Value of Investment | $ 6,174,791 |  |  |  | $ 6,144,320 |  |  |  | $ 6,174,791 | $ 6,144,320 |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 73.30% | 72.50% |
All others | Sales Revenue, Services, Net | Rents from significant lessee |  |  |  |  |  |  |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |  |  |  |  |  |  |
Concentration of credit risk (as a percent) |  |  |  |  |  |  |  |  | 81.00% | 80.40% |
Total revenues |  |  |  |  |  |  |  |  | $ 904,542 | $ 864,280 |

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130543-203045 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130539-203045 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130545-203045 + Details
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