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Investments (Investment Gains and Losses) (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost $ 1,374,777 $ 1,343,755
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 3,583 129,896
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 217,312 3,034
Fixed maturity securities, available-for-sale 1,161,048 1,470,617
US Treasury Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 9,448 9,515
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 190 1,097
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 10 1
Fixed maturity securities, available-for-sale 9,628 10,611
US Government Agencies Debt Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 3,441 3,463
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 272 996
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Fixed maturity securities, available-for-sale 3,713 4,459
US States and Political Subdivisions Debt Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 349,835 356,594
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 1,686 28,056
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 36,222 692
Fixed maturity securities, available-for-sale 315,299 383,958
Corporate Debt Securities Financial Sector Member [Domain]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 237,294 213,652
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 189 22,477
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 46,131 172
Fixed maturity securities, available-for-sale 191,352 235,957
Corporate Debt Security Consumer Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 249,551 219,223
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 562 23,658
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 50,401 900
Fixed maturity securities, available-for-sale 199,712 241,981
Corporate Debt Security Utilities Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 114,259 105,738
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 5 7,358
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 25,643 801
Fixed maturity securities, available-for-sale 88,621 112,295
Corporate Debt Security Energy Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 76,175 76,989
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 7,334
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 13,377 68
Fixed maturity securities, available-for-sale 62,798 84,255
Corporate Debt Security All Other Sector    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 184,197 196,403
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 669 22,497
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 32,737 380
Fixed maturity securities, available-for-sale 152,129 218,520
Commercial Mortgage Backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 50  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0  
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0  
Fixed maturity securities, available-for-sale 50  
Residential Mortgage Backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 110,610 117,755
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 8 16,046
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 9,807 6
Fixed maturity securities, available-for-sale 100,811 133,795
Asset-backed Securities [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 39,817 44,322
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 0 368
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 2,984 14
Fixed maturity securities, available-for-sale 36,833 44,676
Foreign Government, Non-US [Member]    
Gross Unrealized Gains and Losses [Line Items]    
Debt Securities, Available-for-sale, Amortized Cost 100 101
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax 2 9
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax 0 0
Fixed maturity securities, available-for-sale $ 102 $ 110