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Related Party Transactions (Details) | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 GBP (£) | May 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party expenses | $ 9,013,000 | $ 7,742,000 | $ 17,105,000 | $ 15,175,000 |  |  |  |  |
Base management fees incurred but not yet paid | 9,013,000 |  | $ 9,013,000 |  |  |  | $ 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 | 9,000,000 | 7,700,000 | $ 17,100,000 | 15,200,000 |  |  |  |  |
Base management fees incurred but not yet paid | 9,000,000 |  | 9,000,000 |  |  |  | $ 8,200,000 |  |
Limited Liability Company [Member] | Reimbursements [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party expenses | 600,000 | 100,000 | 1,200,000 | 200,000 |  |  |  |  |
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 |  | 100,000,000.0 |  | 100,000,000.0 |  |  |  | 125,000,000.0 |
Commercial Mortgage Portfolio Segment [Member] | Residential Condominium [Member] | Pre-development Mezzanine Loan [Member] | Affiliated Entity [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Original face amount | $ 6.4 | $ 25,000,000.0 | $ 6.4 | $ 25,000,000.0 | £ 4.8 | $ 28,200,000.0 |  | $ 25,000,000.0 |

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