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Fair Value Measurement (Assets Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Assets:    
Fixed maturities, available-for-sale $ 3,531,815 $ 3,833,722
Fixed maturities, trading 45,274 43,670
Equity investments 147,612 214,807
Level 3    
Liabilities:    
Other liabilities 24,000 24,000
U.S. Treasury obligations    
Assets:    
Fixed maturities, available-for-sale 221,744 238,507
U.S. Government-sponsored enterprise obligations    
Assets:    
Fixed maturities, available-for-sale 17,633 20,234
State and municipal bonds    
Assets:    
Fixed maturities, available-for-sale 473,168 519,196
Corporate debt, limited observable inputs | Level 3    
Assets:    
Fixed maturities, available-for-sale 74,212 47,129
Residential mortgage-backed securities    
Assets:    
Fixed maturities, available-for-sale 385,225 453,941
Agency commercial mortgage-backed securities    
Assets:    
Fixed maturities, available-for-sale 11,940 14,141
Other commercial mortgage-backed securities    
Assets:    
Fixed maturities, available-for-sale 208,487 231,483
Other asset-backed securities    
Assets:    
Fixed maturities, available-for-sale 423,610 457,664
Recurring    
Assets:    
Total assets categorized within the fair value hierarchy 4,413,243 4,679,262
Recurring | Level 1    
Assets:    
Fixed maturities, trading 0 0
Other assets   0
Total assets categorized within the fair value hierarchy 432,288 388,285
Liabilities:    
Other liabilities 0 0
Total liabilities categorized within the fair value hierarchy 0 0
Recurring | Level 2    
Assets:    
Fixed maturities, trading 45,274 43,670
Other assets   649
Total assets categorized within the fair value hierarchy 3,626,891 3,962,596
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 83,776 57,565
Liabilities:    
Other liabilities 24,000 24,000
Total liabilities categorized within the fair value hierarchy 24,000 24,000
Recurring | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, trading 45,274 43,670
Other assets   649
Total assets categorized within the fair value hierarchy 4,142,955 4,408,446
Liabilities:    
Other liabilities 24,000 24,000
Total liabilities categorized within the fair value hierarchy 24,000 24,000
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 221,744 238,507
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 221,744 238,507
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 17,633 20,234
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 17,633 20,234
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 473,168 519,196
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 473,168 519,196
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 1,715,796 1,851,427
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 1,715,796 1,851,427
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 74,212 47,129
Recurring | Corporate debt, limited observable inputs | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 74,212 47,129
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 384,952 453,644
Recurring | Residential mortgage-backed securities | Level 3    
Assets:    
Fixed maturities, available-for-sale 273 297
Recurring | Residential mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 385,225 453,941
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 11,940 14,141
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 11,940 14,141
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 207,922 231,483
Recurring | Other commercial mortgage-backed securities | Level 3    
Assets:    
Fixed maturities, available-for-sale 565 0
Recurring | Other commercial mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 208,487 231,483
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 420,410 451,459
Recurring | Other asset-backed securities | Level 3    
Assets:    
Fixed maturities, available-for-sale 3,200 6,205
Recurring | Other asset-backed securities | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Fixed maturities, available-for-sale 423,610 457,664
Recurring | Financial | Level 1    
Assets:    
Equity investments 10,813 6,615
Recurring | Financial | Level 2    
Assets:    
Equity investments 289 855
Recurring | Financial | Level 3    
Assets:    
Equity investments 2,125 0
Recurring | Financial | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 13,227 7,470
Recurring | Utilities/Energy | Level 1    
Assets:    
Equity investments 912  
Recurring | Utilities/Energy | Level 2    
Assets:    
Equity investments 0  
Recurring | Utilities/Energy | Level 3    
Assets:    
Equity investments 0  
Recurring | Utilities/Energy | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 912  
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 2,500 2,500
Recurring | Industrial | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Equity investments 2,500 2,500
Recurring | Bond funds | Level 1    
Assets:    
Equity investments 116,358 187,059
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 116,358 187,059
Recurring | All other | Level 1    
Assets:    
Equity investments 14,615 17,778
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 14,615 17,778
Recurring | Short-term investments | Level 1    
Assets:    
Short-term and other investments 287,642 174,944
Recurring | Short-term investments | Level 2    
Assets:    
Short-term and other investments 38,408 42,043
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 326,050 216,987
Recurring | Other investments | Level 1    
Assets:    
Short-term and other investments 1,948 1,889
Recurring | Other investments | Level 2    
Assets:    
Short-term and other investments 89,355 95,288
Recurring | Other investments | Level 3    
Assets:    
Short-term and other investments 901 1,434
Recurring | Other investments | Fair Value, Inputs, Level 1, 2 and 3    
Assets:    
Short-term and other investments 92,204 98,611
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 $ 270,288 $ 270,816