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Related Party Transactions (Details) $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2018 GBP (£) | May 31, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  | $ 9,613 | $ 8,092 |
Base management fees incurred but not yet paid |  |  |  |  |  | 9,613 |  | $ 9,804
Commercial mortgage loans and subordinate loans, net |  |  |  |  |  | $ 5,186,999 |  | 4,927,593
Limited Liability Company [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Rate of management fees |  |  |  |  |  | 1.50% |  |
Extension period |  |  |  |  |  | 1 year |  |
Period of termination |  |  |  |  |  | 180 days |  |
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 |  |  |  |  |  | $ 9,600 |  | 9,800
Affiliated Entity [Member] | Management Fees [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  | 9,600 | 8,100 |
Affiliated Entity [Member] | Reimbursements [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Related party expenses |  |  |  |  |  | 700 | 600 |
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |
Commercial mortgage loans and subordinate loans, net |  |  |  |  |  | $ 4,003,089 |  | $ 3,878,981
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 |  | $ 100,000 |  | $ 125,000 |

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