General - Allowance for Credit Losses on Premium Receivables (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Beginning balance	$ 6,000	$ 10,000
Provision during the period for expected credit losses	1,170	(2,141)
Write-off amounts during the period	(1,319)	(1,015)
Recoveries during the period of amounts previously written off	149	156
Ending balance	$ 6,000	$ 7,000