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Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Held-to-maturity fixed maturity securities $ 667,192 $ 712,348
Fixed maturity securities, AFS 3,034,511 2,897,373
Equity securities, AFS 152,986 157,355
Short-term investments 174,472 217,044
Notes payable 307,366 307,360
Percentage of fixed maturity portfolio utilizing market approach 95.00%  
Carrying Amount [Member]
    
Held-to-maturity fixed maturity securities 667,192 712,348
Fixed maturity securities, AFS 3,034,511 2,897,373
Equity securities, AFS 152,986 157,355
Short-term investments 174,472 217,044
Receivable for proceeds related to sale of Selective HR 2,989 3,212
Notes payable 307,366 307,360
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 49,909 49,908
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 99,457 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 fixed maturity securities 711,731 758,043
Fixed maturity securities, AFS 3,034,511 2,897,373
Equity securities, AFS 152,986 157,355
Short-term investments 174,472 217,044
Receivable for proceeds related to sale of Selective HR 2,989 3,212
Notes payable 332,008 323,054
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 59,814 51,111
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 113,261 113,195
Fair Value [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 100,520 100,360
Fair Value [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,725 13,759
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable $ 44,688 $ 44,629