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Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Held-to-maturity Securities $ 600,716 $ 712,348
AFS fixed maturity securities 3,269,960 2,897,373
Equity securities, AFS 155,577 157,355
Short-term investments 184,878 217,044
Notes payable 307,380 307,360
Percentage of fixed maturity portfolio utilizing market approach 95.00%  
Carrying Amount [Member]
    
Held-to-maturity Securities 600,716 712,348
AFS fixed maturity securities 3,269,960 2,897,373
Equity securities, AFS 155,577 157,355
Short-term investments 184,878 217,044
Receivable for proceeds related to sale of Selective HR 2,799 3,212
Notes payable 307,380 307,360
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 49,911 49,908
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 99,469 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 646,035 758,043
AFS fixed maturity securities 3,269,960 2,897,373
Equity securities, AFS 155,577 157,355
Short-term investments 184,878 217,044
Receivable for proceeds related to sale of Selective HR 2,799 3,212
Notes payable 323,900 323,054
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 62,201 51,111
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 102,169 113,195
Fair Value [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 100,200 100,360
Fair Value [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,667 13,759
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable $ 45,663 $ 44,629