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Fair Value Measurement (Assets and Liabilities Measured at Fair Value) (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Assets:    
Fixed maturities, available for sale $ 2,125,921 $ 2,280,242
Equity investments 496,026 470,609
Fair Value 297,762 230,889
Investment in unconsolidated subsidiaries    
Assets:    
Fair Value 277,505 210,759
Level 3 | Corporate debt, limited observable inputs    
Assets:    
Total assets categorized within the fair value hierarchy 8,380 13,703
Level 3 | Other investments    
Assets:    
Total assets categorized within the fair value hierarchy 5 409
Recurring    
Assets:    
Other assets 2,588 1,731
Total assets categorized within the fair value hierarchy 2,880,015 3,216,879
Total assets at fair value 3,177,777 3,447,768
Recurring | U.S. Treasury obligations    
Assets:    
Fixed maturities, available for sale 146,457 133,627
Recurring | U.S. Government-sponsored enterprise obligations    
Assets:    
Fixed maturities, available for sale 31,702 20,956
Recurring | State and municipal bonds    
Assets:    
Fixed maturities, available for sale 331,100 632,243
Recurring | Corporate debt, multiple observable inputs    
Assets:    
Fixed maturities, available for sale 1,187,247 1,153,455
Recurring | Corporate debt, limited observable inputs    
Assets:    
Fixed maturities, available for sale 8,380 13,703
Recurring | Residential mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 204,236 197,844
Recurring | Agency commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 13,812 10,742
Recurring | Other commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 32,715 15,961
Recurring | Other asset-backed securities    
Assets:    
Fixed maturities, available for sale 170,272 101,711
Recurring | Corporate Debt    
Assets:    
Trading Securities 29,772  
Recurring | Financial    
Assets:    
Equity investments 74,656 76,051
Recurring | Utilities/Energy    
Assets:    
Equity investments 57,936 54,388
Recurring | Consumer oriented    
Assets:    
Equity investments 55,459 54,529
Recurring | Industrial    
Assets:    
Equity investments 46,285 53,936
Recurring | Bond funds    
Assets:    
Equity investments 146,795 156,563
Recurring | All other    
Assets:    
Equity investments 94,638 75,142
Recurring | Short-term investments    
Assets:    
Short-term and other investments 212,945 432,126
Recurring | Other investments    
Assets:    
Short-term and other investments 33,020 32,171
Fair Value   20,130
Recurring | Investment in unconsolidated subsidiaries    
Assets:    
Fair Value   210,759
Recurring | Level 1    
Assets:    
Other assets 0 0
Total assets categorized within the fair value hierarchy 678,397 877,791
Recurring | Level 1 | U.S. Treasury obligations    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | U.S. Government-sponsored enterprise obligations    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | State and municipal bonds    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | Corporate debt, multiple observable inputs    
Assets:    
Fixed maturities, available for sale 2,262 2,371
Recurring | Level 1 | Corporate debt, limited observable inputs    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | Residential mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | Agency commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | Other commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | Other asset-backed securities    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 1 | Corporate Debt    
Assets:    
Trading Securities 0  
Recurring | Level 1 | Financial    
Assets:    
Equity investments 74,656 76,051
Recurring | Level 1 | Utilities/Energy    
Assets:    
Equity investments 57,936 54,388
Recurring | Level 1 | Consumer oriented    
Assets:    
Equity investments 55,459 54,529
Recurring | Level 1 | Industrial    
Assets:    
Equity investments 46,285 53,936
Recurring | Level 1 | Bond funds    
Assets:    
Equity investments 146,795 156,563
Recurring | Level 1 | All other    
Assets:    
Equity investments 94,638 75,142
Recurring | Level 1 | Short-term investments    
Assets:    
Short-term and other investments 200,366 404,204
Recurring | Level 1 | Other investments    
Assets:    
Short-term and other investments 0 607
Recurring | Level 2    
Assets:    
Other assets 2,588 1,731
Total assets categorized within the fair value hierarchy 2,183,813 2,319,990
Recurring | Level 2 | U.S. Treasury obligations    
Assets:    
Fixed maturities, available for sale 146,457 133,627
Recurring | Level 2 | U.S. Government-sponsored enterprise obligations    
Assets:    
Fixed maturities, available for sale 31,702 20,956
Recurring | Level 2 | State and municipal bonds    
Assets:    
Fixed maturities, available for sale 331,100 632,243
Recurring | Level 2 | Corporate debt, multiple observable inputs    
Assets:    
Fixed maturities, available for sale 1,184,985 1,151,084
Recurring | Level 2 | Corporate debt, limited observable inputs    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 2 | Residential mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 204,236 196,789
Recurring | Level 2 | Agency commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 13,812 10,742
Recurring | Level 2 | Other commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 32,715 15,961
Recurring | Level 2 | Other asset-backed securities    
Assets:    
Fixed maturities, available for sale 160,852 97,780
Recurring | Level 2 | Corporate Debt    
Assets:    
Trading Securities 29,772  
Recurring | Level 2 | Financial    
Assets:    
Equity investments 0 0
Recurring | Level 2 | Utilities/Energy    
Assets:    
Equity investments 0 0
Recurring | Level 2 | Consumer oriented    
Assets:    
Equity investments 0 0
Recurring | Level 2 | Industrial    
Assets:    
Equity investments 0 0
Recurring | Level 2 | Bond funds    
Assets:    
Equity investments 0 0
Recurring | Level 2 | All other    
Assets:    
Equity investments 0 0
Recurring | Level 2 | Short-term investments    
Assets:    
Short-term and other investments 12,579 27,922
Recurring | Level 2 | Other investments    
Assets:    
Short-term and other investments 33,015 31,155
Recurring | Level 3    
Assets:    
Other assets 0 0
Total assets categorized within the fair value hierarchy 17,805 19,098
Recurring | Level 3 | U.S. Treasury obligations    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 3 | U.S. Government-sponsored enterprise obligations    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 3 | State and municipal bonds    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 3 | Corporate debt, multiple observable inputs    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 3 | Corporate debt, limited observable inputs    
Assets:    
Fixed maturities, available for sale 8,380 13,703
Recurring | Level 3 | Residential mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 0 1,055
Recurring | Level 3 | Agency commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 3 | Other commercial mortgage-backed securities    
Assets:    
Fixed maturities, available for sale 0 0
Recurring | Level 3 | Other asset-backed securities    
Assets:    
Fixed maturities, available for sale 9,420 3,931
Recurring | Level 3 | Corporate Debt    
Assets:    
Trading Securities 0  
Recurring | Level 3 | Financial    
Assets:    
Equity investments 0 0
Recurring | Level 3 | Utilities/Energy    
Assets:    
Equity investments 0 0
Recurring | Level 3 | Consumer oriented    
Assets:    
Equity investments 0 0
Recurring | Level 3 | Industrial    
Assets:    
Equity investments 0 0
Recurring | Level 3 | Bond funds    
Assets:    
Equity investments 0 0
Recurring | Level 3 | All other    
Assets:    
Equity investments 0 0
Recurring | Level 3 | Short-term investments    
Assets:    
Short-term and other investments 0 0
Recurring | Level 3 | Other investments    
Assets:    
Short-term and other investments 5 409
Mortgage fund | Other investments    
Assets:    
Fair Value 0 20,130
Mortgage fund | Equities    
Assets:    
Fair Value $ 20,257 $ 0