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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, 2013
Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities $ 11,510,497 $ 11,841,005
Equity securities 338,907 376,022
Arbitrage trading account 619,881 329,077
Level 1 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Equity securities 237,303 280,658
Assets, fair value disclosure 490,135 514,261
Arbitrage trading account 252,832 233,603
Securities sold but not yet purchased 88,482 114,909
Level 1 | Fair Value, Measurements, Recurring [Member] | U.S. government and 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
    
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 237,303 280,658
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 11,464,480 11,781,940
Equity securities 96,593 93,335
Assets, fair value disclosure 11,927,935 11,969,821
Arbitrage trading account 366,862 94,546
Securities sold but not yet purchased 7 6,558
Level 2 | Fair Value, Measurements, Recurring [Member] | U.S. government and agency
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 825,059 898,463
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,118,137 4,768,519
Level 2 | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,493,465 1,715,697
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 3,854,455 3,287,654
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,173,364 1,111,607
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 96,593 93,335
Level 3 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 46,017 59,065
Equity securities 5,011 2,029
Assets, fair value disclosure 51,215 62,022
Arbitrage trading account 187 928
Securities sold but not yet purchased 0 20
Level 3 | Fair Value, Measurements, Recurring [Member] | U.S. government and 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 46,017 59,065
Level 3 | Fair Value, Measurements, Recurring [Member] | Foreign
    
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 1,239 1,408
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 3,772 621
Fair Value | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 11,510,497 11,841,005
Equity securities 338,907 376,022
Assets, fair value disclosure 12,469,285 12,546,104
Arbitrage trading account 619,881 329,077
Securities sold but not yet purchased 88,489 121,487
Fair Value | Fair Value, Measurements, Recurring [Member] | U.S. government and agency
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 825,059 898,463
Fair Value | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,118,137 4,768,519
Fair Value | Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,493,465 1,715,697
Fair Value | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 3,900,472 3,346,719
Fair Value | Fair Value, Measurements, Recurring [Member] | Foreign
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,173,364 1,111,607
Fair Value | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 238,542 282,066
Fair Value | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 100,365 $ 93,956