Historical Loss and LAE Development - Reconciliation of Unpaid Losses and Settlement Expenses (LAE) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Unpaid losses and LAE at beginning of year
Gross	$ 2,446,025	$ 2,315,637
Ceded	(757,349)	(740,089)
Net	1,688,676	1,575,548
Increase (decrease) in incurred losses and LAE
Current accident year	376,546	339,951
Prior accident years	(64,923)	(71,520)
Total incurred	311,623	268,431
Loss and LAE payments for claims incurred
Current accident year	(40,078)	(30,978)
Prior accident years	(197,887)	(172,282)
Total paid	(237,965)	(203,260)
Net unpaid losses and LAE at June 30	1,762,334	1,640,719
Unpaid losses and LAE at June 30
Gross	2,544,622	2,361,577
Ceded	(782,288)	(720,858)
Net unpaid losses and LAE at June 30	$ 1,762,334	$ 1,640,719