Reinsurance - List of Direct, Assumed, and Ceded Reinsurance Amounts (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Premiums written:
Direct	$ 1,315,911	$ 1,132,760
Assumed	5,985	5,394
Ceded	(165,275)	(138,386)
Net	1,156,621	999,768
Premiums earned:
Direct	1,205,368	1,032,228
Assumed	6,191	6,290
Ceded	(160,615)	(136,182)
Net	1,050,944	902,336
Loss and loss expense incurred:
Direct	753,567	613,229
Assumed	5,981	5,255
Ceded	(55,256)	(51,046)
Net	$ 704,292	$ 567,438

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