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Reinsurance Recoverable Credit Ratings (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance recoverable, gross $ 648,591   $ 784,410      
Reinsurance Recoverable, Allowance for Credit Loss (1,800) $ (2,300) (1,600) $ (1,600) $ (1,600) $ (1,600)
Reinsurance recoverable, net of allowance for credit losses 646,791   782,810      
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 12,135   5,011      
Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Gross [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 636,456   779,399      
Total federal and state pools [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 80,629   180,794      
Total federal and state pools [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 0   0      
Total federal and state pools [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 80,629   180,794      
Other than Federal And State Pools [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 7,192   14,093      
Other than Federal And State Pools [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 475   415      
Other than Federal And State Pools [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 6,717   13,678      
Non Rated Reinsurer [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 87,821   194,887      
Non Rated Reinsurer [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 475   415      
Non Rated Reinsurer [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 87,346   194,472      
AM Best, A++ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 81,005   46,283      
AM Best, A++ Rating [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 888   1      
AM Best, A++ Rating [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 80,117   46,282      
AM Best, A+ Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 353,169   428,586      
AM Best, A+ Rating [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 5,367   3,191      
AM Best, A+ Rating [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 347,802   425,395      
AM Best, A Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 122,908   107,417      
AM Best, A Rating [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 5,316   1,315      
AM Best, A Rating [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 117,592   106,102      
AM Best, A- Rating [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 3,688   7,237      
AM Best, A- Rating [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 89   89      
AM Best, A- Rating [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 3,599   7,148      
AM Best Rated Reinsurer [Member]            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 560,770   589,523      
AM Best Rated Reinsurer [Member] | Financial Asset, Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross 11,660   4,596      
AM Best Rated Reinsurer [Member] | Financial Asset, Not Past Due            
Reinsurance Recoverable, Credit Quality Indicator [Line Items]            
Reinsurance Recoverables, Gross $ 549,110   $ 584,927