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Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Payables and Accruals [Abstract]    
Accrued dividends payable $ 69,799 $ 69,033
Collateral deposited under derivative agreements 1,820 20,000
Accrued interest payable 13,488 14,208
Accounts payable and other liabilities 6,450 1,505
Total $ 91,557 $ 104,746