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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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Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | $ 6,375,093 | $ 6,375,093 | $ 4,927,593 |  |
Loan fundings |  |  |  |  | 876,658 | 3,435,457 |  |
Loan repayments |  |  |  |  | (683,254) | (2,037,322) |  |
Gain (loss) on foreign currency translation |  |  |  |  | 80,618 | 43,649 |  |
Realized loss on investment |  |  |  |  | (42,465) | 2,487 |  |
Transfer to Real estate owned, held for sale |  |  |  |  | (12,255) | 0 |  |
Specific CECL Allowance |  |  |  |  | (118,019) | (35,000) |  |
General CECL Allowance (Reversal) |  |  |  |  | (10,323) | 0 |  |
Deferred Fees |  |  |  |  | (6,455) | (46,275) |  |
PIK interest, amortization of fees and other items |  |  |  |  | 65,158 | 84,504 |  |
Balance at close of the year |  |  |  |  | 6,496,977 | 6,375,093 | $ 4,927,593 |
Specific CECL allowance (reversal) |  |  |  |  | 118,019 | 13,000 |  |
Provision for loan losses and impairments, net | [1] |  |  |  | 125,600 | 20,000 | 20,000 |
Financing receivable, loan specific, credit loss, expense, net of reversal |  |  |  |  | (10,000) |  |  |
Provision for loan and lease losses and impairment |  |  |  |  |  | 35,000 |  |
Off-Balance Sheet, Credit Loss, Liability |  | $ 3,595 | $ 4,119 | 6,059 | 3,365 | 0 |  | $ 3,088
Adjustment due to Adoption of ASU |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Balance at beginning of year |  |  |  | (27,779) | (27,779) | 0 |  |
Balance at close of the year |  |  |  |  |  | (27,779) | $ 0 |
Off-Balance Sheet, Credit Loss, Liability |  |  |  |  |  | 3,088 |  |
Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Gain (loss) on foreign currency translation |  |  |  |  | 80,832 |  |  |
Realized loss on investment |  |  |  |  | 42,465 |  |  |
Transfer to Real estate owned, held for sale |  |  |  |  | (12,255) |  |  |
Specific CECL allowance (reversal) |  |  |  |  | 118,019 |  |  |
Provision for loan losses and impairments, net |  | $ (550) | $ 5,500 | $ 150,000 |  |  |  |
Affiliated Entity | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Cash flows between transferor and transferee, proceeds from new transfers, amount funded |  |  |  |  |  | 208,500 |  |
Sale of Mezzanine Loan | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Cash flows between transferor and transferee, proceeds from new transfers, amount funded |  |  |  |  |  | 152,600 |  |
Residential Condominium - Bethesda, MD |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Specific CECL allowance (reversal) |  |  |  |  | 1,100 |  |  |
Residential Condominium - Bethesda, MD | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  | (11,100) |  |  |
Specific CECL allowance (reversal) |  |  |  |  | 11,100 |  |  |
Provision for loan and lease losses and impairment |  |  |  |  |  | 3,000 |  |
Retail Center - Cincinnati, OH |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Specific CECL allowance (reversal) |  |  |  |  | 47,000 |  |  |
Loan And Leases Receivable, Cost Recovery |  |  |  |  | 1,800 | 1,400 |  |
Retail Center - Cincinnati, OH | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Provision for loan and lease losses and impairment |  |  |  |  |  | 32,000 |  |
Multifamily - Williston, ND | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  |  | (12,500) |  |
Provision for loan losses and impairments, net |  |  |  |  |  | $ 15,000 |  |
Miscellaneous Properties | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  | (26,000) |  |  |
Specific CECL allowance (reversal) |  |  |  |  | 24,500 |  |  |
Miscellaneous Properties Two | Commercial Mortgage and Subordinated Portfolio Segment |  |  |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |  |  |
Realized loss on investment |  |  |  |  | $ (5,200) |  |  |
[1] | Comprised of $118,019 of Specific CECL Allowance, $10,600 of General CECL Allowance, and a $3,019 reversal of a previously recorded impairment on an equity investment for the year ended December 31, 2020, respectively. For the years ended December 31, 2019 and 2018 the balance represents provision per loan losses as determined by the authoritative guidance at the time.

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