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Fair Value Measurement (Assets Measured at Fair Value) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Fixed maturities, available-for-sale | $ 3,904,136 | $ 2,457,531
Fixed maturities, trading | 45,049 | 48,456
Equity investments | 214,530 | 120,101
Level 3 |  |
Liabilities: |  |
Other liabilities | 24,000 | 0
U.S. Treasury obligations |  |
Assets: |  |
Fixed maturities, available-for-sale | 242,705 | 107,059
U.S. Government-sponsored enterprise obligations |  |
Assets: |  |
Fixed maturities, available-for-sale | 20,468 | 12,261
State and municipal bonds |  |
Assets: |  |
Fixed maturities, available-for-sale | 522,707 | 332,920
Corporate debt, limited observable inputs | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 19,712 | 3,265
Residential mortgage-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 477,909 | 276,541
Agency commercial mortgage-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 14,942 | 13,310
Other commercial mortgage-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 219,024 | 113,092
Other asset-backed securities |  |
Assets: |  |
Fixed maturities, available-for-sale | 443,268 | 273,006
Recurring |  |
Assets: |  |
Total assets categorized within the fair value hierarchy | 4,674,541 | 3,242,057
Recurring | Level 1 |  |
Assets: |  |
Fixed maturities, trading | 0 | 0
Other assets | 0 | 0
Total assets categorized within the fair value hierarchy | 325,663 | 416,757
Liabilities: |  |
Other liabilities | 0 |
Total liabilities categorized within the fair value hierarchy | 0 |
Recurring | Level 2 |  |
Assets: |  |
Fixed maturities, trading | 45,049 | 48,456
Other assets | 601 | 329
Total assets categorized within the fair value hierarchy | 4,059,680 | 2,567,083
Liabilities: |  |
Other liabilities | 0 |
Total liabilities categorized within the fair value hierarchy | 0 |
Recurring | Level 3 |  |
Assets: |  |
Fixed maturities, trading | 0 | 0
Other assets | 0 | 0
Total assets categorized within the fair value hierarchy | 37,523 | 11,958
Liabilities: |  |
Other liabilities | 24,000 |
Total liabilities categorized within the fair value hierarchy | 24,000 |
Recurring | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, trading | 45,049 | 48,456
Other assets | 601 | 329
Total assets categorized within the fair value hierarchy | 4,422,866 | 2,995,798
Liabilities: |  |
Other liabilities | 24,000 |
Total liabilities categorized within the fair value hierarchy | 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 | 242,705 | 107,059
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 | 242,705 | 107,059
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 | 20,468 | 12,261
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 | 20,468 | 12,261
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 | 522,707 | 332,920
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 | 522,707 | 332,920
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 | 1,943,401 | 1,326,077
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 | 1,943,401 | 1,326,077
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 | 19,712 | 3,265
Recurring | Corporate debt, limited observable inputs | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 19,712 | 3,265
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 | 473,674 | 274,509
Recurring | Residential mortgage-backed securities | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 4,235 | 2,032
Recurring | Residential mortgage-backed securities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 477,909 | 276,541
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 | 14,942 | 13,310
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 | 14,942 | 13,310
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 | 219,024 | 113,092
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 | 219,024 | 113,092
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 | 432,261 | 266,345
Recurring | Other asset-backed securities | Level 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 11,007 | 6,661
Recurring | Other asset-backed securities | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Fixed maturities, available-for-sale | 443,268 | 273,006
Recurring | Financial | Level 1 |  |
Assets: |  |
Equity investments | 0 | 13,810
Recurring | Financial | Level 2 |  |
Assets: |  |
Equity investments | 868 | 0
Recurring | Financial | Level 3 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | Financial | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 868 | 13,810
Recurring | Utilities/Energy | Level 1 |  |
Assets: |  |
Equity investments | 0 | 564
Recurring | Utilities/Energy | Level 2 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | Utilities/Energy | Level 3 |  |
Assets: |  |
Equity investments | 69 | 0
Recurring | Utilities/Energy | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 69 | 564
Recurring | Consumer oriented | Level 1 |  |
Assets: |  |
Equity investments |  | 1,262
Recurring | Consumer oriented | Level 2 |  |
Assets: |  |
Equity investments |  | 0
Recurring | Consumer oriented | Level 3 |  |
Assets: |  |
Equity investments |  | 0
Recurring | Consumer oriented | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments |  | 1,262
Recurring | Industrial | Level 1 |  |
Assets: |  |
Equity investments | 0 | 2,240
Recurring | Industrial | Level 2 |  |
Assets: |  |
Equity investments | 0 | 0
Recurring | Industrial | Level 3 |  |
Assets: |  |
Equity investments | 2,500 | 0
Recurring | Industrial | Fair Value, Inputs, Level 1, 2 and 3 |  |
Assets: |  |
Equity investments | 2,500 | 2,240
Recurring | Bond funds | Level 1 |  |
Assets: |  |
Equity investments | 191,834 | 69,475
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 | 191,834 | 69,475
Recurring | All other | Level 1 |  |
Assets: |  |
Equity investments | 19,259 | 20,202
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 | 19,259 | 20,202
Recurring | Short-term investments | Level 1 |  |
Assets: |  |
Short-term and other investments | 112,706 | 307,695
Recurring | Short-term investments | Level 2 |  |
Assets: |  |
Short-term and other investments | 39,002 | 30,118
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 | 151,708 | 337,813
Recurring | Other investments | Level 1 |  |
Assets: |  |
Short-term and other investments | 1,864 | 1,509
Recurring | Other investments | Level 2 |  |
Assets: |  |
Short-term and other investments | 104,978 | 42,607
Recurring | Other 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 | 106,842 | 44,116
Recurring | Equity investments | Fair Value Measured at Net Asset Value Per Share | Equity investments |  |
Assets: |  |
Total assets categorized within the fair value hierarchy |  | 12,548
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 | $ 251,675 | $ 233,711

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