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Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Payables and Accruals [Abstract] |  |  |  |  |  |  |
Accrued dividends payable |  | $ 52,768 |  |  |  |  | $ 74,771
Accrued interest payable |  | 13,979 |  |  |  |  | 16,089
Accounts payable and other liabilities |  | 4,775 |  |  |  |  | 6,922
General CECL allowance related to unfunded commitments |  | 3,365 | $ 3,595 | $ 4,119 | $ 6,059 | $ 3,088 | 0
Collateral deposited under derivative agreements |  | 0 |  |  |  |  | 2,930
Total | [1] | $ 74,887 |  |  |  |  | $ 100,712
[1] | Includes $3,365 of General CECL Allowance related to unfunded commitments on commercial mortgage loans, subordinate loans and other lending assets, net in 2020.

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