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General - Effects of Reinsurance (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Premiums Written        
Direct $ 1,139,500 $ 1,034,100 $ 2,158,000 $ 2,052,300
Premiums Earned        
Ceded 24,000 17,000 47,000 35,000
Net 1,034,469 987,512 2,039,173 1,950,062
Property & Casualty        
Premiums Written        
Direct 1,132,216 1,025,749 2,144,453 2,037,134
Ceded (24,184) (17,370) (47,574) (34,971)
Assumed 66 279 15,097 10,444
Net 1,108,098 1,008,658 2,111,976 2,012,607
Premiums Earned        
Direct 1,047,413 994,659 2,064,283 1,964,822
Ceded (23,999) (17,097) (47,197) (34,559)
Assumed 3,856 2,742 7,746 5,459
Net $ 1,027,270 $ 980,304 $ 2,024,832 $ 1,935,722