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Revenue Recognition - Advisory Agreements (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Jan. 01, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Related Party Transaction [Line Items] |  |  |  |
Advisory fees |  |  | $ 1,382 | $ 1,010
Management services revenue |  |  | $ 48,570 | 42,727
RIF |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fee percent |  |  | 0.85% |
RMR Advisors and Tremont Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fees |  |  | $ 729 | 606
Tremont Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fees |  |  | 653 | 404
Management services revenue |  |  | $ 238 | $ 206
Tremont Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fee percentage based on weighted average outstanding balance of strategic investments |  |  | 1.35% |
Advisory fee percentage based on outstanding principal balance of outstanding loans |  |  | 0.50% |
Business management fee percent based on management agreements |  |  | 1.50% |
Minimum | Tremont Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fee percentage based on aggregate principal amounts of loan originate |  |  | 0.50% |
Maximum | Tremont Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fee percentage based on aggregate principal amounts of loan originate |  |  | 1.00% |
Subsequent event | Tremont Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fee percentage based on weighted average outstanding balance of strategic investments | 0.35% |  |  |
Forecast | Tremont Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Advisory fee percent |  | 20.00% |  |
Advisory fee percentage |  | 7.00% |  |

X
- Definition Advisory Fee, Annual Revenue Earned, Percent of Outstanding Principal Balance of Outstanding Loans + References No definition available. + Details
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X
- Definition Advisory Fee, Annual Revenue Earned, Percent of Weighted Average Outstanding Balance of Investments + References No definition available. + Details
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X
- Definition Represents the advisory fee percentage based on the daily managed assets. + References No definition available. + Details
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X
- Definition Advisory Fee, Revenue Earned, Percent of Aggregate Principal Amounts of Loans Originated + References No definition available. + Details
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X
- Definition Base Management Advisory Fee Percentage + References No definition available. + Details
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X
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X
- Definition Amount of fees earned from providing investment advice and research to customers. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(a),(d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Revenue, comprised of base and incentive revenue derived from the management of joint ventures, managing third-party properties, or another entity's operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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