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Fair Value Measurements (Assets and Liabilities Measured At Fair Value, On a Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities $ 11,885,142 $ 11,515,524
Equity securities 322,773 283,338
Arbitrage trading account 681,077 522,128
Level 1 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Equity securities 162,824 159,537
Assets, fair value disclosure 384,360 351,818
Arbitrage trading account 221,536 192,281
Securities sold but not yet purchased 91,118 162,126
Level 1 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 1 | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 162,824 159,537
Level 1 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 2 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 11,847,059 11,472,660
Equity securities 154,951 118,811
Assets, fair value disclosure 12,460,787 11,919,538
Arbitrage trading account 458,777 328,067
Securities sold but not yet purchased 0 152
Level 2 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 930,857 884,859
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,257,032 4,218,284
Level 2 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,348,908 1,329,783
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,399,116 4,159,877
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 911,146 879,857
Level 2 | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0 0
Level 2 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 154,951 118,811
Level 3 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 38,083 42,864
Equity securities 4,998 4,990
Assets, fair value disclosure 43,845 49,634
Arbitrage trading account 764 1,780
Securities sold but not yet purchased 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 38,083 42,864
Level 3 | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Level 3 | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 1,238 1,238
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 3,760 3,752
Fair Value | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 11,885,142 11,515,524
Equity securities 322,773 283,338
Assets, fair value disclosure 12,888,992 12,320,990
Arbitrage trading account 681,077 522,128
Securities sold but not yet purchased 91,118 162,278
Fair Value | Fair Value, Measurements, Recurring [Member] | U.S. government and government agency
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 930,857 884,859
Fair Value | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,257,032 4,218,284
Fair Value | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,348,908 1,329,783
Fair Value | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,437,199 4,202,741
Fair Value | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 911,146 879,857
Fair Value | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 164,062 160,775
Fair Value | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 158,711 $ 122,563