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Related Party Transactions (Details) - USD ($) | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses | $ 8,092,000 | $ 7,432,000 |  |  |  |
Base management fees incurred but not yet paid | $ 8,092,000 |  | $ 8,168,000 |  |  |
Limited Liability Company [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Rate of management fees | 1.50% |  |  |  |  |
Extension period | 1 year |  |  |  |  |
Voting requirement to termination management agreement, percentage | 66.66% |  |  |  |  |
Period of termination | 180 days |  |  |  |  |
Termination vote threshold rate, percentage | 300.00% |  |  |  |  |
Termination fee calculation period | 24 months |  |  |  |  |
Limited Liability Company [Member] | Management Fees [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses | $ 8,100,000 | 7,400,000 |  |  |  |
Base management fees incurred but not yet paid | 8,100,000 | 7,400,000 |  |  |  |
Limited Liability Company [Member] | Reimbursements [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Related party expenses | $ 600,000 | $ 100,000 |  |  |  |
Champ Limited Partnership [Member] | Subsidiaries [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Indirect ownership interest from limited partnership |  |  |  |  |  | 59.00%
KBC Bank Deutschland AG [Member] | Champ LP [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Indirect ownership interest from limited partnership |  |  |  |  |  | 35.00%
Residential Condominium [Member] | Pre-development Mezzanine Loan [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Original face amount |  |  |  | $ 300,000,000.0 |  |
Commercial Mortgage Portfolio Segment [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Original face amount |  |  |  | 125,000,000.0 | $ 100,000,000.0 |
Commercial Mortgage Portfolio Segment [Member] | Residential Condominium [Member] | Pre-development Mezzanine Loan [Member] | Affiliated Entity [Member] |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |
Original face amount |  |  |  | $ 25,000,000.0 | $ 25,000,000.0 |

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