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Indebtedness (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2005
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2004
Maximum borrowing percentage   10.00%      
Debt Issuance Costs, Gross   $ 3,300      
Net proceeds from the issuance   $ 20,000 $ 60,000 $ 0  
Borrowing threshold of FHLBI   20      
Five Point Three Hundred Seventy Five Percent Senior Notes [Member]          
Original debt issuance   $ 300,000      
Interest Rate   5.375%      
Discount for notes issued   $ 5,900      
Net proceeds from the issuance   290,800      
Five Point Eight Hundred Seventy Five Percent Senior Notes [Member]          
Original debt issuance   $ 185,000      
Interest Rate   5.875%      
Proceeds From Debt Issuance After Redemption   $ 106,000      
Debt Retirement Costs Before Tax   4,200      
Debt Retirement Costs Net of Tax   3,300      
Three Point Zero Three Percent Borrowing From Federal Home Loan Bank Due December 16, 2026 [Member]          
Federal Home Loan Bank Advances     45,000    
Original debt issuance   $ 60,000      
Interest Rate   3.03%      
Net proceeds from the issuance     15,000    
Six Point Seventy Percent Senior Notes due 2035 [Member]          
Acceleration of principal   $ 10,000      
Original debt issuance   $ 100,000      
Interest Rate   6.70%      
Discount for notes issued $ 700        
Net proceeds from the issuance $ 50,000        
Effective yield 6.754%        
Seven Point Twenty Five Percent Senior Notes due 2034 [Member]          
Acceleration of principal   $ 10,000      
Original debt issuance   $ 50,000      
Interest Rate   7.25%      
Discount for notes issued         $ 100
Effective yield         7.27%
Bond proceeds to Insurance Subsidiaries as capital         $ 25,000
Line of Credit [Member]          
Acceleration of principal   $ 30,000      
Maximum borrowing percentage   10.00%      
Zero Point Seventy Percent Borrowing from FHLBNY Due June 27, 2022. [Member] | Selective Insurace Company of America (SICA) [Member]          
Federal Home Loan Bank Advances   $ 20,000      
Federal Home Loan Bank, Advances, Interest Rate   5.00%      
Federal Home Loan Bank of Indianapolis [Member]          
Aggregate investment in FHLBI   $ 5,200 $ 5,200