Other Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Other Liabilities [Abstract]
Payable for unsettled investment purchases	$ 103,654	$ 132,026
Dividends and dividend equivalents payable	35,789	35,769
Lease liability	43,576	45,314
Accrued interest payable	30,834	23,040
Accrued expenses and other	122,177	75,321
Total Other Liabilities	$ 336,030	$ 311,470
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Total Other Liabilities	Total Other Liabilities