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Accounts Receivable (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable      
Premiums receivable $ 46,228,000 $ 42,988,000  
Other receivables 11,171,000 3,169,000  
Total accounts receivable 57,399,000 46,157,000  
Less: Allowance for doubtful accounts 0 0  
Accounts receivable, net 57,399,000 46,157,000  
Provision for doubtful accounts $ 0 $ 0 $ 0
Premiums Receivable      
Accounts Receivable      
Threshold period unpaid for write-off of mortgage insurance premiums (more than) 90 days