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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, 2013
Dec. 31, 2012
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities $ 11,533,428 $ 11,841,005
Equity securities 434,841 376,022
Arbitrage trading account 680,713 329,077
Level 1 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 0 0
Equity securities 329,398 280,658
Assets, fair value disclosure 509,239 514,261
Arbitrage trading account 179,841 233,603
Securities sold but not yet purchased 117,636 114,909
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 329,398 280,658
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 11,482,507 11,781,940
Equity securities 100,428 93,335
Assets, fair value disclosure 12,083,724 11,969,821
Arbitrage trading account 500,789 94,546
Securities sold but not yet purchased 54,354 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 844,102 898,463
Level 2 | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,147,252 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 1,559,753 1,715,697
Level 2 | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 3,809,941 3,287,654
Level 2 | Fair Value, Measurements, Recurring [Member] | Foreign
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,121,459 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 100,428 93,335
Level 3 | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 50,921 59,065
Equity securities 5,015 2,029
Assets, fair value disclosure 56,019 62,022
Arbitrage trading account 83 928
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 50,921 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 1,238 1,408
Level 3 | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 3,777 621
Fair Value | Fair Value, Measurements, Recurring [Member]
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 11,533,428 11,841,005
Equity securities 434,841 376,022
Assets, fair value disclosure 12,648,982 12,546,104
Arbitrage trading account 680,713 329,077
Securities sold but not yet purchased 171,990 121,487
Fair Value | Fair Value, Measurements, Recurring [Member] | U.S. government and agency
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 844,102 898,463
Fair Value | Fair Value, Measurements, Recurring [Member] | State and municipal
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 4,147,252 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 1,559,753 1,715,697
Fair Value | Fair Value, Measurements, Recurring [Member] | Corporate
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 3,860,862 3,346,719
Fair Value | Fair Value, Measurements, Recurring [Member] | Foreign
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Fixed maturity securities 1,121,459 1,111,607
Fair Value | Fair Value, Measurements, Recurring [Member] | Common stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities 330,636 282,066
Fair Value | Fair Value, Measurements, Recurring [Member] | Preferred stocks
    
Fair Value Measurements, Recurring and Nonrecurring Basis [Line Items]    
Equity securities $ 104,205 $ 93,956