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General - Allowance for Credit Losses on Premium Receivables (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Premiums Receivable, Allowance for Doubtful Accounts [Roll Forward]        
Beginning balance $ 7,000 $ 10,000 $ 10,000 $ 1,445
Provision during the period for expected credit losses (390) 719 (2,532) 8,888
Write-off amounts during the period (757) (885) (1,771) (2,543)
Recoveries during the period of amounts previously written off 147 166 303 355
Ending balance 6,000 10,000 6,000 10,000
Cumulative Effect, Period Of Adoption, Adjustment [Member]        
Premiums Receivable, Allowance for Doubtful Accounts [Roll Forward]        
Beginning balance 0 0 0 1,855
Cumulative Effect, Period Of Adoption, Adjusted Balance [Member]        
Premiums Receivable, Allowance for Doubtful Accounts [Roll Forward]        
Beginning balance $ 7,000 $ 10,000 $ 10,000 $ 3,300