Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Liabilities [Abstract]
Dividends and dividend equivalents payable	$ 34,016	$ 90,749
Accrued interest payable	11,116	18,238
Accrued expenses and other	25,390	43,625
Total Other Liabilities	$ 70,522	$ 152,612