Other Operating Expenses and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Other Operating Expenses and Other Expenses [Abstract]
Amortization of policy acquisition costs	$ 27,457	$ 23,188	$ 55,503	$ 46,025
Other underwriting expenses of the operating segments	22,860	16,960	45,791	36,310
Other operating expenses of the Corporate and Other segment	8,548	8,888	17,830	16,762
Total	58,865	49,036	119,124	99,097
Other expenses	$ 223	$ 0	$ 826	$ 368