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Real Estate Owned and Related Debt (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 29, 2021 | May 24, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  |  |  | $ 20,000 |  |  |  |  |
Real estate held-for-sale, impairment |  |  |  |  |  |  |  |  |  | $ 600 |
Total carrying value, net |  |  |  | $ 6,496,977 |  | 7,857,260 | $ 6,496,977 |  |  |  |
Specific CECL (allowance) reversal |  |  | $ 10,000 |  |  | (30,000) | 118,019 | $ 13,000 |  |  |
Realized loss on investments |  |  |  |  |  | 20,767 | 47,632 | $ 12,513 |  |  |
Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 238,400 |  |  |  |  |
Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  | 473,200 |  |  |  |  |
Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net | [1] |  |  | 1,045,893 |  | 844,948 | $ 1,045,893 |  |  |  |
Subordinate Mortgage Portfolio Segment | Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific CECL (allowance) reversal |  |  |  |  | $ 10,000 |  |  |  |  |  |
Hotel - Anaheim, CA | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for sale |  |  |  |  |  |  |  |  | $ 33,000 |  |
Specific CECL allowance (reversal), net of previously recorded amount |  |  |  | $ (2,400) |  |  |  |  |  |  |
Hotel - Washington D.C. |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Specific CECL (allowance) reversal |  |  |  |  |  | $ 10,000 |  |  |  |  |
Hotel - Washington D.C. | Junior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  | $ 20,000
Hotel - Washington D.C. | Senior Mezzanine Loans |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total carrying value, net |  |  |  |  |  |  |  |  |  |  | 24,500
Payments to acquire mortgage notes receivable |  |  | 24,500 |  |  |  |  |  |  |  |
Hotel - Washington D.C. | Subordinate Mortgage Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt related to real estate owned, held for investment |  | $ 110,000 | $ 110,000 |  |  |  |  |  |  |  | $ 110,000
Payments for mortgage loans |  | $ 110,000 |  |  |  |  |  |  |  |  |
[1] | Net of $178,588 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $145,000 a nd $175,000 Specific CECL Allowance and $33,588 and $38,102 General CECL Allowance, respectively.

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