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Fair Value Measurements (Carrying Value and Estimated Fair Value of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Jun. 30, 2009
Fixed maturity securities, held-to-maturity - at carrying value (fair value: $811 - 2010) $ 712,348 $ 1,214,324  
Fixed maturity securities, AFS 2,897,373 2,342,742  
Equity securities, AFS 157,355 69,636 31,100
Short-term investments 217,044 161,155  
Notes payable 307,360 262,333  
Carrying Amount [Member]
      
Fixed maturity securities, held-to-maturity - at carrying value (fair value: $811 - 2010) 712,348 1,214,324  
Fixed maturity securities, AFS 2,897,373 2,342,742  
Equity securities, AFS 157,355 69,636  
Short-term investments 217,044 161,155  
Receivable for proceeds related to sale of Selective HR 3,212 5,002  
Notes payable 307,360 262,333  
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
      
Notes payable 49,908 49,904  
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
      
Notes payable 99,452 99,429  
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 0  
Fair Value [Member]
      
Fixed maturity securities, held-to-maturity - at carrying value (fair value: $811 - 2010) 758,043 1,256,294  
Fixed maturity securities, AFS 2,897,373 2,342,742  
Equity securities, AFS 157,355 69,636  
Short-term investments 217,044 161,155  
Receivable for proceeds related to sale of Selective HR 3,212 5,002  
Notes payable 323,054 258,516  
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
      
Notes payable 51,111 55,190  
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
      
Notes payable 113,195 90,097  
Fair Value [Member] | Seven Point Fifty Percent Junior Notes [Member]
      
Notes payable 100,360 99,840  
Fair Value [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
      
Notes payable 13,759 13,389  
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
      
Notes payable $ 44,629 $ 0