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Fair Value Measurement (Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Assets: |  |
Equity securities, trading, at fair value | $ 322,353 | $ 314,482
Other investments | 79,133 | 86,057
Other investments |  |
Total assets at fair value | 3,395,111 | 3,752,976
Level 3 [Member] | State and municipal bonds [Member] |  |
Other investments |  |
Total assets at fair value | 0 | 5,000
Level 3 [Member] | Corporate debt, limited observable inputs [Member] |  |
Other investments |  |
Total assets at fair value | 14,500 | 13,100
Level 3 [Member] | Other asset-backed securities [Member] |  |
Other investments |  |
Total assets at fair value | 800 | 4,800
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Other investments | 30,611 | 28,958
Other investments |  |
Total assets at fair value | 3,232,487 | 3,619,726
Fair Value, Measurements, Recurring [Member] | U.S. Treasury obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 123,892 | 166,512
Fair Value, Measurements, Recurring [Member] | U.S. Government-sponsored enterprise obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 26,334 | 39,563
Fair Value, Measurements, Recurring [Member] | State and municipal bonds [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 940,635 | 1,062,615
Fair Value, Measurements, Recurring [Member] | Corporate debt, multiple observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 1,277,186 | 1,404,020
Fair Value, Measurements, Recurring [Member] | Corporate debt, limited observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 14,500 | 13,081
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 238,387 | 276,056
Fair Value, Measurements, Recurring [Member] | Agency commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 10,999 | 15,493
Fair Value, Measurements, Recurring [Member] | Other commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 30,134 | 51,063
Fair Value, Measurements, Recurring [Member] | Other asset-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 98,220 | 116,624
Fair Value, Measurements, Recurring [Member] | Financial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 67,764 | 79,341
Fair Value, Measurements, Recurring [Member] | Utilities/Energy [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 41,050 | 25,629
Fair Value, Measurements, Recurring [Member] | Consumer oriented [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 56,470 | 65,670
Fair Value, Measurements, Recurring [Member] | Industrial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 48,305 | 55,460
Fair Value, Measurements, Recurring [Member] | Fixed Income Funds [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 76,316 | 55,196
Fair Value, Measurements, Recurring [Member] | All other [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 32,448 | 33,186
Fair Value, Measurements, Recurring [Member] | Short-term Investments [Member] |  |
Assets: |  |
Short-term investments | 119,236 | 131,259
Fair Value, Measurements, Recurring [Member] | Accounting Standards Update 2015-07 [Member] |  |
Other investments |  |
LP/LLC interests carried at NAV which approximates fair value. These interests, reported as a part of Investment in unconsolidated subsidiaries, are not categorized within the fair value hierarchy. | 162,624 | 133,250
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] |  |
Assets: |  |
Other investments | 3,478 | 6,050
Other investments |  |
Total assets at fair value | 400,255 | 451,731
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Treasury obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | U.S. Government-sponsored enterprise obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | State and municipal bonds [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate debt, multiple observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 2,362 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Corporate debt, limited observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Residential mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Agency commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other asset-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 67,764 | 79,341
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Utilities/Energy [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 41,050 | 25,629
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Consumer oriented [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 56,470 | 65,670
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Industrial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 48,305 | 55,460
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Fixed Income Funds [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 76,316 | 55,196
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | All other [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 18,239 | 33,186
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Short-term investments | 86,271 | 131,199
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] |  |
Assets: |  |
Other investments | 27,133 | 22,908
Other investments |  |
Total assets at fair value | 2,816,975 | 3,145,120
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 123,892 | 166,512
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government-sponsored enterprise obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 26,334 | 39,563
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | State and municipal bonds [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 940,635 | 1,057,590
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate debt, multiple observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 1,274,824 | 1,404,020
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Corporate debt, limited observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Residential mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 238,387 | 276,056
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 10,999 | 15,493
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 30,134 | 51,063
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other asset-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 97,463 | 111,855
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Utilities/Energy [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Consumer oriented [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Industrial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Fixed Income Funds [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | All other [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 14,209 | 0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Short-term investments | 32,965 | 60
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] |  |
Assets: |  |
Other investments | 0 | 0
Other investments |  |
Total assets at fair value | 15,257 | 22,875
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Treasury obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | U.S. Government-sponsored enterprise obligations [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | State and municipal bonds [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 5,025
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate debt, multiple observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Corporate debt, limited observable inputs [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 14,500 | 13,081
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Residential mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Agency commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other commercial mortgage-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Other asset-backed securities [Member] |  |
Assets: |  |
Fixed maturities, available for sale | 757 | 4,769
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Utilities/Energy [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Consumer oriented [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Industrial [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Fixed Income Funds [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | All other [Member] |  |
Assets: |  |
Equity securities, trading, at fair value | 0 | 0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Short-term Investments [Member] |  |
Assets: |  |
Short-term investments | $ 0 | $ 0

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