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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
Jun. 30, 2014
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities $ 11,986,703 $ 11,515,524
Equity securities 257,059 283,338
Arbitrage trading account 732,279 522,128
Level 1 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Equity securities 102,762 159,537
Assets, fair value disclosure 357,835 351,818
Arbitrage trading account 255,073 192,281
Securities sold but not yet purchased 111,986 162,126
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 102,762 159,537
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 11,949,661 11,472,660
Equity securities 149,763 118,811
Assets, fair value disclosure 12,573,948 11,919,538
Arbitrage trading account 474,524 328,067
Securities sold but not yet purchased 5 152
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 867,127 884,859
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,220,740 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 1,306,136 1,329,783
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,587,282 4,159,877
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 968,376 879,857
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 149,763 118,811
Level 3 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 37,042 42,864
Equity securities 4,534 4,990
Assets, fair value disclosure 44,258 49,634
Arbitrage trading account 2,682 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 37,042 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 765 1,238
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 3,769 3,752
Fair Value | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 11,986,703 11,515,524
Equity securities 257,059 283,338
Assets, fair value disclosure 12,976,041 12,320,990
Arbitrage trading account 732,279 522,128
Securities sold but not yet purchased 111,991 162,278
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 867,127 884,859
Fair Value | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,220,740 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 1,306,136 1,329,783
Fair Value | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,624,324 4,202,741
Fair Value | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 968,376 879,857
Fair Value | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 103,527 160,775
Fair Value | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 153,532 $ 122,563