Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Other Liabilities [Abstract]
Accrued interest payable	$ 13,648	$ 14,129
Swaps, at fair value (1)	0	46,954
Dividends and dividend equivalents payable	74,830	74,657	$ 74,583
Accrued expenses and other liabilities	11,103	19,612
Total Other Liabilities	$ 99,581	$ 155,352