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Fair Value Measurement (Assets Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets:    
Fixed maturities, available-for-sale $ 3,355,312 $ 3,472,472
Fixed maturities, trading 45,999 43,434
Equity investments 143,920 143,738
Level 3    
Liabilities:    
Other liabilities 9,500 15,000
U.S. Treasury obligations    
Assets:    
Fixed maturities, available-for-sale 237,828 221,608
U.S. Government-sponsored enterprise obligations    
Assets:    
Fixed maturities, available-for-sale 18,871 19,934
State and municipal bonds    
Assets:    
Fixed maturities, available-for-sale 436,268 439,450
Corporate debt, limited observable inputs | Level 3    
Assets:    
Fixed maturities, available-for-sale 65,960 63,973
Residential mortgage-backed securities    
Assets:    
Fixed maturities, available-for-sale 396,947 389,540
Agency commercial mortgage-backed securities    
Assets:    
Fixed maturities, available-for-sale 8,652 9,704
Other commercial mortgage-backed securities    
Assets:    
Fixed maturities, available-for-sale 185,809 194,090
Other asset-backed securities    
Assets:    
Fixed maturities, available-for-sale 406,959 416,694
Recurring    
Assets:    
Total assets categorized within the fair value hierarchy 4,127,284 4,259,889
Recurring | Level 1    
Assets:    
Fixed maturities, trading 0 0
Other assets 0  
Total assets categorized within the fair value hierarchy 322,400 322,534
Liabilities:    
Other liabilities 10,680 0
Total liabilities categorized within the fair value hierarchy 10,680 0
Recurring | Level 2    
Assets:    
Fixed maturities, trading 45,999 43,434
Other assets 10,366  
Total assets categorized within the fair value hierarchy 3,465,410 3,603,357
Liabilities:    
Other liabilities 0 0
Total liabilities categorized within the fair value hierarchy 0 0
Recurring | Level 3    
Assets:    
Fixed maturities, trading 0 0
Other assets 0  
Total assets categorized within the fair value hierarchy 74,793 71,513
Liabilities:    
Other liabilities 9,500 15,000
Total liabilities categorized within the fair value hierarchy 9,500 15,000
Recurring | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, trading 45,999 43,434
Other assets 10,366  
Total assets categorized within the fair value hierarchy 3,862,603 3,997,404
Liabilities:    
Other liabilities 20,180 15,000
Total liabilities categorized within the fair value hierarchy 20,180 15,000
Recurring | U.S. Treasury obligations | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | U.S. Treasury obligations | Level 2    
Assets:    
Fixed maturities, available-for-sale 237,828 221,608
Recurring | U.S. Treasury obligations | Level 3    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | U.S. Treasury obligations | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 237,828 221,608
Recurring | U.S. Government-sponsored enterprise obligations | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | U.S. Government-sponsored enterprise obligations | Level 2    
Assets:    
Fixed maturities, available-for-sale 18,871 19,934
Recurring | U.S. Government-sponsored enterprise obligations | Level 3    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | U.S. Government-sponsored enterprise obligations | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 18,871 19,934
Recurring | State and municipal bonds | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | State and municipal bonds | Level 2    
Assets:    
Fixed maturities, available-for-sale 436,268 439,450
Recurring | State and municipal bonds | Level 3    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | State and municipal bonds | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 436,268 439,450
Recurring | Corporate debt, multiple observable inputs | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Corporate debt, multiple observable inputs | Level 2    
Assets:    
Fixed maturities, available-for-sale 1,598,018 1,717,479
Recurring | Corporate debt, multiple observable inputs | Level 3    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Corporate debt, multiple observable inputs | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 1,598,018 1,717,479
Recurring | Corporate debt, limited observable inputs | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Corporate debt, limited observable inputs | Level 2    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Corporate debt, limited observable inputs | Level 3    
Assets:    
Fixed maturities, available-for-sale 65,960 63,973
Recurring | Corporate debt, limited observable inputs | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 65,960 63,973
Recurring | Residential mortgage-backed securities | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Residential mortgage-backed securities | Level 2    
Assets:    
Fixed maturities, available-for-sale 396,676 389,291
Recurring | Residential mortgage-backed securities | Level 3    
Assets:    
Fixed maturities, available-for-sale 271 249
Recurring | Residential mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 396,947 389,540
Recurring | Agency commercial mortgage-backed securities | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Agency commercial mortgage-backed securities | Level 2    
Assets:    
Fixed maturities, available-for-sale 8,652 9,704
Recurring | Agency commercial mortgage-backed securities | Level 3    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Agency commercial mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 8,652 9,704
Recurring | Other commercial mortgage-backed securities | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Other commercial mortgage-backed securities | Level 2    
Assets:    
Fixed maturities, available-for-sale 185,809 194,090
Recurring | Other commercial mortgage-backed securities | Level 3    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Other commercial mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 185,809 194,090
Recurring | Other asset-backed securities | Level 1    
Assets:    
Fixed maturities, available-for-sale 0 0
Recurring | Other asset-backed securities | Level 2    
Assets:    
Fixed maturities, available-for-sale 406,018 413,989
Recurring | Other asset-backed securities | Level 3    
Assets:    
Fixed maturities, available-for-sale 941 2,705
Recurring | Other asset-backed securities | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 406,959 416,694
Recurring | Financial | Level 1    
Assets:    
Equity investments 8,594 9,850
Recurring | Financial | Level 2    
Assets:    
Equity investments 2,214 2,219
Recurring | Financial | Level 3    
Assets:    
Equity investments 287 303
Recurring | Financial | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 11,095 12,372
Recurring | Utilities/Energy | Level 1    
Assets:    
Equity investments 845 854
Recurring | Utilities/Energy | Level 2    
Assets:    
Equity investments 0 0
Recurring | Utilities/Energy | Level 3    
Assets:    
Equity investments 0 0
Recurring | Utilities/Energy | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 845 854
Recurring | Industrial | Level 1    
Assets:    
Equity investments 0 0
Recurring | Industrial | Level 2    
Assets:    
Equity investments 0 0
Recurring | Industrial | Level 3    
Assets:    
Equity investments 4,946 2,500
Recurring | Industrial | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 4,946 2,500
Recurring | Bond funds | Level 1    
Assets:    
Equity investments 109,907 112,136
Recurring | Bond funds | Level 2    
Assets:    
Equity investments 0 0
Recurring | Bond funds | Level 3    
Assets:    
Equity investments 0 0
Recurring | Bond funds | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 109,907 112,136
Recurring | All other | Level 1    
Assets:    
Equity investments 17,127 15,876
Recurring | All other | Level 2    
Assets:    
Equity investments 0 0
Recurring | All other | Level 3    
Assets:    
Equity investments 0 0
Recurring | All other | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 17,127 15,876
Recurring | Short-term investments | Level 1    
Assets:    
Short-term and other investments 184,853 181,937
Recurring | Short-term investments | Level 2    
Assets:    
Short-term and other investments 62,541 63,376
Recurring | Short-term investments | Level 3    
Assets:    
Short-term and other investments 0 0
Recurring | Short-term investments | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Short-term and other investments 247,394 245,313
Recurring | Other investments | Level 1    
Assets:    
Short-term and other investments 1,074 1,881
Recurring | Other investments | Level 2    
Assets:    
Short-term and other investments 56,150 88,783
Recurring | Other investments | Level 3    
Assets:    
Short-term and other investments 2,388 1,783
Recurring | Other investments | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Short-term and other investments 59,612 92,447
Recurring | Equity investments | Fair Value Measured at Net Asset Value Per Share | Investment in unconsolidated subsidiaries    
Assets:    
Total assets categorized within the fair value hierarchy $ 264,681 $ 262,485