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Fair Value of Assets and Liabilities - Assets (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Recurring Fair Value Measurements |  |
Unrealized gains and losses on equity securities, net | $ 27,241 | $ 0
Five Star |  |
Recurring Fair Value Measurements |  |
Equity securities investment (in shares) | 4,235,000 |
Recurring | RMR Inc |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | $ 184,487 |
Recurring | Five Star |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | 5,506 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | RMR Inc |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | 184,487 |
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Five Star |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | 5,506 |
Recurring | Significant Other Observable Inputs (Level 2) | RMR Inc |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | 0 |
Recurring | Significant Other Observable Inputs (Level 2) | Five Star |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | 0 |
Recurring | Significant Unobservable Inputs (Level 3) | RMR Inc |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | 0 |
Recurring | Significant Unobservable Inputs (Level 3) | Five Star |  |
Recurring Fair Value Measurements |  |
Investments in affiliates, fair value | $ 0 |
Class A common shares | RMR Inc |  |
Recurring Fair Value Measurements |  |
Equity securities investment (in shares) | 2,637,408 |
Investment, original cost | $ 69,826 |
Unrealized gains and losses on equity securities, net | 28,088 |
Common Shares |  |
Recurring Fair Value Measurements |  |
Investment, original cost | 6,353 |
Unrealized gains and losses on equity securities, net | $ (847) |
Common Shares | Five Star |  |
Recurring Fair Value Measurements |  |
Equity securities investment (in shares) | 4,235,000 |

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- Definition Balance held at close of period in number of shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=63488139&loc=d3e12121-115841 + Details
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- Definition Fair value portion of investments in an entity not consolidated. Includes, but is not limited to, investments in an entity that is affiliated with the reporting entity by means of direct or indirect ownership, an entity in which the reporting entity shares control of the entity with another party or group, an entity which the company has significant influence, but does not have control and subsidiaries that are not required to be consolidated and are accounted for using the equity or cost method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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