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General - Effects of Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Premiums Written        
Direct $ 1,387,300 $ 1,139,500 $ 2,688,400 $ 2,158,000
Premiums Earned        
Ceded 31,400 24,000 62,500 47,200
Net 1,236,024 1,034,469 2,402,703 2,039,173
Property & Casualty        
Premiums Written        
Direct 1,380,511 1,132,216 2,674,986 2,144,453
Ceded (31,884) (24,184) (63,183) (47,574)
Assumed 85 66 15,244 15,097
Net 1,348,712 1,108,098 2,627,047 2,111,976
Premiums Earned        
Direct 1,256,208 1,047,413 2,442,793 2,064,283
Ceded (31,371) (23,999) (62,450) (47,197)
Assumed 3,859 3,856 7,722 7,746
Net $ 1,228,696 $ 1,027,270 $ 2,388,065 $ 2,024,832