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Reinsurance (List of direct, assumed and ceded Reinsurance Amounts) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Premiums Written:      
Direct premiums written $ 4,725,459 $ 4,068,518 $ 3,656,537
Assumed 23,999 32,320 22,664
Ceded premiums written (614,926) (527,248) (489,488)
Net 4,134,532 3,573,590 3,189,713
Premiums Earned:      
Direct 4,386,556 3,880,522 3,472,715
Assumed 25,027 30,742 21,550
Ceded premiums earned (583,977) (537,884) (477,012)
Total net premiums earned 3,827,606 3,373,380 3,017,253
Loss and loss expense incurred:      
Direct 2,738,301 2,537,638 2,096,512
Assumed 19,581 23,160 13,813
Ceded loss and loss expense (273,597) (449,020) (296,341)
Net $ 2,484,285 $ 2,111,778 $ 1,813,984