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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
Sep. 30, 2014
Dec. 31, 2013
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities $ 12,296,560 $ 11,515,524
Equity securities 222,024 283,338
Arbitrage trading account 918,223 522,128
Level 1 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Equity securities 68,852 159,537
Assets, fair value disclosure 306,162 351,818
Arbitrage trading account 237,310 192,281
Securities sold but not yet purchased 159,501 162,126
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 68,852 159,537
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 12,272,560 11,472,660
Equity securities 138,313 118,811
Assets, fair value disclosure 13,087,769 11,919,538
Arbitrage trading account 676,896 328,067
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 813,034 884,859
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,180,068 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 1,298,845 1,329,783
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 5,017,702 4,159,877
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 962,911 879,857
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 138,313 118,811
Level 3 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 24,000 42,864
Equity securities 14,859 4,990
Assets, fair value disclosure 42,876 49,634
Arbitrage trading account 4,017 1,780
Securities sold but not yet purchased 31 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 24,000 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 11,121 1,238
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 3,738 3,752
Fair Value | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 12,296,560 11,515,524
Equity securities 222,024 283,338
Assets, fair value disclosure 13,436,807 12,320,990
Arbitrage trading account 918,223 522,128
Securities sold but not yet purchased 159,537 162,278
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 813,034 884,859
Fair Value | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,180,068 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 1,298,845 1,329,783
Fair Value | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 5,041,702 4,202,741
Fair Value | Fair Value, Measurements, Recurring [Member] | Foreign government
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 962,911 879,857
Fair Value | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 79,973 160,775
Fair Value | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 142,051 $ 122,563