Accounts Payable, Accrued Expenses and Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Payables and Accruals [Abstract]
Accrued dividends payable	$ 68,544	$ 56,576
Accrued interest payable	6,540	12,796
Accounts payable and other liabilities	4,454	1,534
Total	$ 79,538	$ 70,906