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Accounts Payable, Accrued Expenses and Other Liabilities Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Payables and Accruals [Abstract]      
Accrued dividends payable $ 63,598 $ 56,576 $ 51,109
Accrued interest payable 5,336 12,796  
Accounts payable and other liabilities 4,396 1,534  
Total $ 73,330 $ 70,906