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Investments - Schedule of 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, 2025
Dec. 31, 2024
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value $ 411,111 $ 440,896
Private equity    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 322,644 346,020
Remaining Commitment 180,116 182,355
Maximum Exposure to Loss 502,760 528,375
Private credit    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 46,294 52,100
Remaining Commitment 111,299 99,185
Maximum Exposure to Loss 157,593 151,285
Real assets    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 42,173 42,776
Remaining Commitment 38,480 38,950
Maximum Exposure to Loss 80,653 81,726
Total alternative investments    
Other Investment Portfolio By Strategy And Remaining Commitment Amount and Maximum Exposure to Loss Associated With Each Strategy [Line Items]    
Carrying Value 411,111 440,896
Remaining Commitment 329,895 320,490
Maximum Exposure to Loss $ 741,006 $ 761,386