Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Other Liabilities [Abstract]
Accrued interest payable	$ 13,402	$ 16,949
Swaps, at fair value	118,893	70,526
Dividends and dividend equivalents declared and unpaid	74,583	74,575	$ 74,581
Accrued expenses and other liabilities	10,336	19,610
Total Other Liabilities	$ 217,214	$ 181,660