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Schedule IV - Mortgage Loans on Real Estate (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) contract | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal Balance |  | $ 6,728,424 |  |
Principal balance |  | 6,535,079 |  | $ 6,375,093
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | 905,648 |  |
General CECL allowance |  | (38,102) |  |
Commercial mortgage loans, net |  | 6,496,977 |  | 6,375,093
Commercial Mortgage Portfolio Segment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal Balance |  | 5,652,484 |  |
Principal balance |  | 5,468,098 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | 854,748 |  |
General CECL allowance |  | (17,012) | $ (12,149) |
Commercial mortgage loans, net | [1],[2] | 5,451,084 |  | 5,326,967
Subordinate Mortgage Portfolio Segment |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal Balance |  | 1,075,940 |  |
Principal balance |  | 1,066,981 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | 50,900 |  |
General CECL allowance |  | (21,090) | $ (15,630) |
Commercial mortgage loans, net | [2] | $ 1,045,893 |  | 1,048,126
Urban Retail Predevelopment | Urban Retail/United Kingdom, December 2023 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 340,896 |  |
Principal balance |  | 338,368 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 340,896 |  |
Urban Retail Predevelopment | Urban Retail/Manhattan, NY, September 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 318,106 |  |
Principal balance |  | 317,088 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | 0 |  |
Hotel |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance |  | $ 1,576,369 |  | 1,660,162
Hotel | Hotel/Spain, August 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 275,887 |  |
Principal balance |  | 274,780 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | 0 |  |
Office |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance |  | $ 1,911,145 |  | 1,401,400
Office | Office/United Kingdom February 2025 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 230,340 |  |
Principal balance |  | 228,740 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 0 |  |
Office | Office/Germany, November 2026 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 216,407 |  |
Principal balance |  | 215,509 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 0 |  |
Office | Office/Manhattan, NY, January 2022 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 197,360 |  |
Principal balance |  | 197,360 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | 0 |  |
Healthcare |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Principal balance |  | $ 369,676 |  | $ 371,423
Healthcare | Healthcare/United Kingdom October 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 227,950 |  |
Principal balance |  | 226,343 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 0 |  |
Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale | Industrial/Brooklyn/Queens, NY, February 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Principal Balance |  | $ 197,000 |  |
Principal balance |  | 196,918 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 0 |  |
Hotel, Office, Urban Predevelopment, Residential-for-sale: inventory, Residential-for-sale: construction, Retail Center, Multifamily, Mixed Use/Various | Hotel, Office, Urban Predevelopment, Residential-for-sale: inventory, Residential-for-sale: construction, Retail Center, Multifamily, Mixed Use/Various | Commercial Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Senior Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  | 39 |  |
Principal Balance |  | $ 3,648,538 |  |
Principal balance |  | 3,472,992 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 513,852 |  |
Residential-for Sale | Residential-for Sale, June 2021 | Subordinate Mortgage Portfolio Segment, Loans and Other Lending Assets In Excess Of 3% Of Carrying Amount Of Total Subordinate Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  |  |  |
Basis spread on variable interest rate |  | 11.34% |  |
Principal Balance |  | $ 222,395 |  |
Principal balance |  | 222,579 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 0 |  |
Residential-for-sale: construction, Hotel, Multifamily, Healthcare, Mixed Use, Residential-for-sale: inventory, Industrial, Office/ Various | Residential for sale construction Hotel Multifamily Healthcare Mixed Use Residential for sale inventory Industrial Office Various 2021-2034 | Subordinate Mortgage Portfolio Segment, Loans and Other Lending Assets Less Than 3% Of The Carrying Amount Of Total Subordinate Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of loans | contract |  | 19 |  |
Principal Balance |  | $ 853,545 |  |
Principal balance |  | 844,402 |  |
Principal Amount of Mortgages Subject to Delinquent Principal or Interest |  | $ 50,900 |  |
London Interbank Offered Rate (LIBOR) | Urban Retail Predevelopment | Urban Retail/United Kingdom, December 2023 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 6.65% |  |
London Interbank Offered Rate (LIBOR) | Urban Retail Predevelopment | Urban Retail/Manhattan, NY, September 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 4.75% |  |
London Interbank Offered Rate (LIBOR) | Hotel | Hotel/Spain, August 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 3.00% |  |
London Interbank Offered Rate (LIBOR) | Office | Office/United Kingdom February 2025 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 3.30% |  |
London Interbank Offered Rate (LIBOR) | Office | Office/Germany, November 2026 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 2.80% |  |
London Interbank Offered Rate (LIBOR) | Office | Office/Manhattan, NY, January 2022 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 5.68% |  |
London Interbank Offered Rate (LIBOR) | Healthcare | Healthcare/United Kingdom October 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 3.79% |  |
London Interbank Offered Rate (LIBOR) | Healthcare, Hotel, Industrial, Mixed Use, Office, Other, Residential-for Rent, Residential-for Sale | Industrial/Brooklyn/Queens, NY, February 2024 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 5.95% |  |
Minimum | Hotel, Office, Urban Predevelopment, Residential-for-sale: inventory, Residential-for-sale: construction, Retail Center, Multifamily, Mixed Use/Various | Hotel, Office, Urban Predevelopment, Residential-for-sale: inventory, Residential-for-sale: construction, Retail Center, Multifamily, Mixed Use/Various | Commercial Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Senior Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 0.00% |  |
Minimum | London Interbank Offered Rate (LIBOR) | Residential-for-sale: construction, Hotel, Multifamily, Healthcare, Mixed Use, Residential-for-sale: inventory, Industrial, Office/ Various | Residential for sale construction Hotel Multifamily Healthcare Mixed Use Residential for sale inventory Industrial Office Various 2021-2034 | Subordinate Mortgage Portfolio Segment, Loans and Other Lending Assets Less Than 3% Of The Carrying Amount Of Total Subordinate Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 0.00% |  |
Maximum | London Interbank Offered Rate (LIBOR) | Hotel, Office, Urban Predevelopment, Residential-for-sale: inventory, Residential-for-sale: construction, Retail Center, Multifamily, Mixed Use/Various | Hotel, Office, Urban Predevelopment, Residential-for-sale: inventory, Residential-for-sale: construction, Retail Center, Multifamily, Mixed Use/Various | Commercial Mortgage Portfolio Segment, Loans Less Than 3% Of The Carrying Amount Of Total Senior Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 9.20% |  |
Maximum | London Interbank Offered Rate (LIBOR) | Residential-for-sale: construction, Hotel, Multifamily, Healthcare, Mixed Use, Residential-for-sale: inventory, Industrial, Office/ Various | Residential for sale construction Hotel Multifamily Healthcare Mixed Use Residential for sale inventory Industrial Office Various 2021-2034 | Subordinate Mortgage Portfolio Segment, Loans and Other Lending Assets Less Than 3% Of The Carrying Amount Of Total Subordinate Loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Basis spread on variable interest rate |  | 13.50% |  |
[1] | Includes $5,418,999 and $4,852,087 pledged as collateral under secured debt arrangements in 2020 and 2019, respectively
[2] | Net of $213,102 CECL Allowances in 2020, comprised of $175,000 Specific CECL Allowance and $38,102 General CECL Allowance. Net of $56,981 provision for loan loss in 2019.

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