Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Other Liabilities [Abstract]
Payable for unsettled investment purchases	$ 0	$ 103,654
Dividends and dividend equivalents payable	36,015	35,789
Lease liability	42,873	43,576
Accrued interest payable	36,187	30,834
Accrued expenses and other	188,952	122,177
Total Other Liabilities	$ 304,027	$ 336,030
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Total Other Liabilities	Total Other Liabilities