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Fair Value Measurement (Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Assets: |  |
Fixed maturities, available-for-sale | $ 3,544,137 | $ 3,493,597
Fixed maturities, trading | 50,106 | 48,324
Equity investments | 137,914 | 151,295
Level 3 |  |
Liabilities: |  |
Other liabilities | 6,500 | 6,500
U.S. Treasury obligations |  |
Assets: |  |
Fixed maturities, available-for-sale | 240,889 | 243,525
U.S. Government-sponsored enterprise obligations |  |
Assets: |  |
Fixed maturities, available-for-sale | 18,927 | 18,724
State and municipal bonds |  |
Assets: |  |
Fixed maturities, available-for-sale | 474,265 | 454,381
Corporate debt, limited observable inputs | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 66,208 | 82,377
Residential mortgage-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 450,052 | 430,137
Agency commercial mortgage-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 7,950 | 8,387
Other commercial mortgage-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 229,029 | 189,474
Other asset-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 408,973 | 398,395
Recurring |  |
Assets: |  |
Total assets categorized within the fair value hierarchy | 4,225,707 | 4,240,936
Recurring | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, trading | 50,106 | 48,324
Other assets | 7,674 | 3,876
Total assets categorized within the fair value hierarchy | 3,979,564 | 3,995,481
Liabilities: |  |
Other liabilities | 15,550 | 10,530
Total liabilities categorized within the fair value hierarchy | 15,550 | 10,530
Recurring | Level 1 |  |
Assets: |  |
Fixed maturities, trading | 0 | 0
Other assets | 0 | 0
Total assets categorized within the fair value hierarchy | 233,085 | 307,270
Liabilities: |  |
Other liabilities | 9,050 | 4,030
Total liabilities categorized within the fair value hierarchy | 9,050 | 4,030
Recurring | Level 2 |  |
Assets: |  |
Fixed maturities, trading | 50,106 | 48,324
Other assets | 7,674 | 3,876
Total assets categorized within the fair value hierarchy | 3,672,154 | 3,591,057
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 | 0
Total assets categorized within the fair value hierarchy | 74,325 | 97,154
Liabilities: |  |
Other liabilities | 6,500 | 6,500
Total liabilities categorized within the fair value hierarchy | 6,500 | 6,500
Recurring | U.S. Treasury obligations | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 240,889 | 243,525
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 | 240,889 | 243,525
Recurring | U.S. Treasury 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 | 18,927 | 18,724
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 | 18,927 | 18,724
Recurring | U.S. Government-sponsored enterprise obligations | 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 | 474,265 | 454,381
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 | 474,265 | 454,381
Recurring | State and municipal bonds | 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 | 1,647,844 | 1,668,197
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 | 1,647,844 | 1,668,197
Recurring | Corporate debt, multiple observable inputs | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 0 | 0
Recurring | Corporate debt, limited observable inputs | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 66,208 | 82,377
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 | 66,208 | 82,377
Recurring | Residential mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 450,052 | 430,137
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 | 450,052 | 429,883
Recurring | Residential mortgage-backed securities | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 0 | 254
Recurring | Agency commercial mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 7,950 | 8,387
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 | 7,950 | 8,387
Recurring | Agency 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 | 229,029 | 189,474
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 | 229,029 | 188,464
Recurring | Other commercial mortgage-backed securities | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 0 | 1,010
Recurring | Other asset-backed securities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 408,973 | 398,395
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 | 406,832 | 395,245
Recurring | Other asset-backed securities | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 2,141 | 3,150
Recurring | Financial | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 12,308 | 12,042
Recurring | Financial | Level 1 |  |
Assets: |  |
Equity investments | 9,750 | 9,464
Recurring | Financial | Level 2 |  |
Assets: |  |
Equity investments | 2,270 | 2,287
Recurring | Financial | Level 3 |  |
Assets: |  |
Equity investments | 288 | 291
Recurring | Utilities/Energy | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 1,258 | 1,256
Recurring | Utilities/Energy | Level 1 |  |
Assets: |  |
Equity investments | 1,258 | 1,256
Recurring | Utilities/Energy | Level 2 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | Utilities/Energy | Level 3 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | Industrial | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 4,946 | 4,946
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 | 4,946
Recurring | Bond funds | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 101,571 | 114,901
Recurring | Bond funds | Level 1 |  |
Assets: |  |
Equity investments | 101,571 | 114,901
Recurring | Bond funds | Level 2 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | Bond funds | Level 3 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | All other | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 17,831 | 18,150
Recurring | All other | Level 1 |  |
Assets: |  |
Equity investments | 17,831 | 18,150
Recurring | All other | Level 2 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | All other | Level 3 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | Short-term investments | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Short-term and other investments | 184,001 | 235,785
Recurring | Short-term investments | Level 1 |  |
Assets: |  |
Short-term and other investments | 102,675 | 163,499
Recurring | Short-term investments | Level 2 |  |
Assets: |  |
Short-term and other investments | 81,326 | 72,286
Recurring | Short-term investments | Level 3 |  |
Assets: |  |
Short-term and other investments | 0 | 0
Recurring | Other investments | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Short-term and other investments | 55,732 | 62,604
Recurring | Other investments | Level 1 |  |
Assets: |  |
Short-term and other investments | 0 | 0
Recurring | Other investments | Level 2 |  |
Assets: |  |
Short-term and other investments | 54,990 | 57,478
Recurring | Other investments | Level 3 |  |
Assets: |  |
Short-term and other investments | 742 | 5,126
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 | $ 246,143 | $ 245,455

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