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Investments Realized Gain (Loss) on Investments (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Gain (Loss) on Securities [Line Items]      
Sale of fixed maturities, available-for-sale $ 20,537,000 $ 66,900,000 $ 38,823,000
Proceeds from sale of equity securities, FV-NI 0 0 0
Gain (Loss) on Sale of Properties 0 5,513,000 0
Gain (Loss) on Disposition of Property Plant Equipment 9,000 (48,000) (80,000)
Proceeds from Sale of Long-term Investments 9,000 0 0
Gain (Loss) on Investments, Excluding Other than Temporary Impairments 94,000 (7,392,000) (1,712,000)
Equity Securities, FV-NI, Unrealized Gain (Loss) 1,596,000 962,000 (828,000)
Realized investment gains, net 1,502,000 5,249,000 108,000
Proceeds from Sale of Property, Plant, and Equipment 11,000 16,000 89,000
Impairment loss, Real Estate, Portion Recognized in Earnings 3,100,000    
Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff 0    
Realized loss on Other than Temporary Impairments 0 (3,105,000) (776,000)
Other than temporary impairment losses, Investments, Portion Not Recognized in Earnings   0  
Real Estate      
Gain (Loss) on Securities [Line Items]      
Other-than-temporary Impairment Losses on Other Long-Term Investments 0 3,105,000 0
Fixed Maturities      
Gain (Loss) on Securities [Line Items]      
Realized loss on Other than Temporary Impairments   0  
Debt Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Available-for-sale Securities, Gross Realized Gains 239,000 2,538,000 1,301,000
Available-for-sale Securities, Gross Realized Losses (351,000) (973,000) (653,000)
Gain (Loss) on Sales, Calls and Maturities of Fixed Maturities (112,000) 1,927,000 1,792,000
Other Than Temporary Impairment Losses on Debt and Equity Securities $ 0 $ 0 $ (776,000)
Available-for-sale Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Number of Debt Securities Sold 29 68 41
Held-to-maturity Securities [Member]      
Gain (Loss) on Securities [Line Items]      
Number of Debt Securities Sold     0
Life Insurance Segment [Member]      
Gain (Loss) on Securities [Line Items]      
Gain (Loss) on Sale of Properties $ 5,500,000    
Realized investment gains, net 1,340,000 $ 6,795,000 $ 358,000
Proceeds from Sale of Property, Plant, and Equipment $ 7,500,000