Allowance for Credit Losses on Premiums Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Allowance for Credit Losses on Premiums Receivable [Line Items]
Premium Receivable, Allowance for Credit Loss	$ 15,200		$ 15,200		$ 14,900	$ 13,600	$ 18,300	$ 21,000
Change in allowance for credit losses on premiums receivable	2,600		5,400
Premiums Receivable, Allowance for Credit Losses, Historical
Allowance for Credit Losses on Premiums Receivable [Line Items]
Change in allowance for credit losses on premiums receivable		$ 1,200		$ 6,300
Reduction in Allowance for Credit Losses on Premiums Receivable
Allowance for Credit Losses on Premiums Receivable [Line Items]
Change in allowance for credit losses on premiums receivable	(100)	(800)	(1,600)	(4,200)
Premiums Receivable, Allowance for Credit Losses, Current period policies
Allowance for Credit Losses on Premiums Receivable [Line Items]
Change in allowance for credit losses on premiums receivable	2,700		7,000
Premiums Receivable [Member]
Allowance for Credit Losses on Premiums Receivable [Line Items]
Premium Receivable, Allowance for Credit Loss	15,200	16,500	15,200	16,500
Current period change for expected credit losses	2,250	180	4,335	1,721
Write-offs charged against the allowance for credit losses	(2,349)	(2,154)	(3,787)	(6,554)
Recoveries	$ 399	$ 174	$ 1,052	$ 333