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Accounts Payable, Accrued Expenses and Other Liabilities Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]      
Accrued dividends payable $ 56,576 $ 51,278 $ 37,828
Accrued interest payable 12,796 7,284  
Accounts payable and other liabilities 1,534 10,397  
Total $ 70,906 $ 68,959