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Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Held-to-maturity Securities $ 643,501 $ 712,348
AFS fixed maturity securities 3,123,006 2,897,373
Equity securities, AFS 148,117 157,355
Short-term investments 135,823 217,044
Notes payable 307,373 307,360
Percentage of fixed maturity portfolio utilizing market approach 95.00%  
Carrying Amount [Member]
    
Held-to-maturity Securities 643,501 712,348
AFS fixed maturity securities 3,123,006 2,897,373
Equity securities, AFS 148,117 157,355
Short-term investments 135,823 217,044
Receivable for proceeds related to sale of Selective HR 2,894 3,212
Notes payable 307,373 307,360
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 49,910 49,908
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 99,463 99,452
Carrying Amount [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 100,000 100,000
Carrying Amount [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,000 13,000
Carrying Amount [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 45,000 45,000
Fair Value [Member]
    
Held-to-maturity Securities 687,981 758,043
AFS fixed maturity securities 3,123,006 2,897,373
Equity securities, AFS 148,117 157,355
Short-term investments 135,823 217,044
Receivable for proceeds related to sale of Selective HR 2,894 3,212
Notes payable 331,787 323,054
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 59,534 51,111
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 112,569 113,195
Fair Value [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 100,880 100,360
Fair Value [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,683 13,759
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable $ 45,121 $ 44,629