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Related Party Transactions (Details) $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 GBP (£) | May 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Sep. 30, 2014
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  | $ 9,804 | $ 9,515 | $ 9,013 | $ 8,092 | $ 8,169 | $ 8,309 | $ 7,742 | $ 7,432 | $ 36,424 | $ 31,652 | $ 23,388 |
Base management fees incurred but not yet paid |  |  |  |  |  | 9,804 |  |  |  | 8,168 |  |  |  | 9,804 | 8,168 |  |
Commercial mortgage loans and subordinate loans, net |  |  |  |  |  | 4,927,593 |  |  |  | 3,679,758 |  |  |  | $ 4,927,593 | 3,679,758 |  |
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] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Base management fees incurred but not yet paid |  |  |  |  |  | $ 9,800 |  |  |  | 8,200 |  |  |  | $ 9,800 | 8,200 |  |
Affiliated Entity [Member] | Management Fees [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,400 | 31,700 | 23,400 |
Affiliated Entity [Member] | Reimbursements [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,100 | 2,600 | $ 2,500 |
Champ Limited Partnership [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Indirect ownership interest from limited partnership |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  | 0.00% |  |  | 59.00%
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans and subordinate loans, net |  |  |  |  |  | $ 3,878,981 |  |  |  | $ 2,653,826 |  |  |  | $ 3,878,981 | $ 2,653,826 |  |
Commercial Mortgage Portfolio Segment [Member] | Affiliated Entity [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire loans receivable | $ 6,400 | £ 4.8 | $ 28,200 | $ 25,000 | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |
Commercial mortgage loans and subordinate loans, net |  |  | $ 300,000 | $ 125,000 | $ 100,000 |  |  |  |  |  | $ 125,000 | $ 100,000 |  |  |  |  |

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