v3.26.3
Statements of Cash Flows - Schedule of Cash Flow Supplemental Disclosures (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash paid (received) during the period for:    
Interest $ 34,568 $ 22,862
Federal income tax 111,000 108,269
Cash paid for amounts included in the measurement of lease liabilities:    
Operating cash flows from operating leases 7,616 7,648
Operating cash flows from financing leases 102 196
Financing cash flows from finance leases 1,964 2,054
Non-cash items:    
Corporate actions related to fixed income securities, available-for-sale ("AFS") 25,477 44,452
Conversion of alternative investment to equity securities 0 20,127
Conversion of alternative investment to other investment 1,288 0
Conversion of AFS fixed income securities to equity securities 0 736
Conversion of commercial mortgage loan (“CML”) to alternative investment 0 3,300
Assets acquired under finance lease arrangements 977 0
Assets acquired under operating lease arrangements 2,358 5,625
Non-cash purchase of property and equipment $ 1 $ 14