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Investments - Alternative Investment Portfolio by Strategy and the Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value $ 402,689 $ 395,779
Private equity    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 306,444 301,759
Remaining Commitment 137,986 131,885
Maximum Exposure to Loss 444,430 433,644
Private credit    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 53,392 54,500
Remaining Commitment 90,569 89,401
Maximum Exposure to Loss 143,961 143,901
Real assets    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 42,853 39,520
Remaining Commitment 31,100 33,040
Maximum Exposure to Loss 73,953 72,560
Alternative investments    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 402,689 395,779
Remaining Commitment 259,655 254,326
Maximum Exposure to Loss $ 662,344 $ 650,105