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Schedule IV - Mortgage Loans on Real Estate - Summary of Changes in Carrying Amounts of Mortgage Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 3,679,758 |  |  |  | $ 2,693,092 | $ 3,679,758 | $ 2,693,092 |
Loan fundings |  |  |  |  |  |  |  |  | 2,350,865 | 1,828,758 |
Loan repayments |  |  |  |  |  |  |  |  | (1,066,843) | (891,848) |
Unrealized gain (loss) on foreign currency translation |  |  |  |  |  |  |  |  | (51,013) | 23,612 |
Discount accretion |  |  |  |  |  |  |  |  | 0 | 0 |
Provision for loan losses |  |  |  |  |  |  |  |  | (20,000) | (1,981) |
Deferred Fees |  |  |  |  |  |  |  |  | (34,066) | (27,424) |
PIK interest, amortization of fees and other items |  |  |  |  |  |  |  |  | 68,892 | 55,549 |
Balance at close of the year | $ 4,927,593 |  |  |  | $ 3,679,758 |  |  |  | 4,927,593 | 3,679,758 | $ 2,693,092
Provision for loan losses and impairment | 15,000 | $ 0 | $ 5,000 | $ 0 | $ 0 | $ 0 | $ 5,000 | $ 0 | 20,000 | 5,000 | $ 15,000
Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  | 37,000 |
Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  | 20,000 |  |
Subordinate Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  |  | 17,000 |
Other Assets [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  |  |  |  | 3,000 |
Other Assets [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Impairment |  |  |  |  |  |  | 3,000 |  | 3,000 |  |
Affiliated Entity [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Loan fundings |  |  |  |  |  |  |  |  | 34,600 |  |
Residential Condominium - Bethesda, MD And Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  | 20,000 |  |
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  |  |  |  |  |  |  | 5,000 |  |
Residential Condominium - Bethesda, MD [Member] | Commercial Mortgage and Subordinated Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment |  |  | $ 5,000 |  |  |  | $ 2,000 |  |  | $ 2,000 |
Retail Center - Cincinnati, OH [Member] | Commercial Mortgage Portfolio Segment [Member] |  |  |  |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses and impairment | $ 15,000 |  |  |  |  |  |  |  | $ 15,000 |  |

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