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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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