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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
AFS fixed maturity securities $ 3,269,960 $ 2,897,373
Equity securities, AFS 155,577 157,355
Short-term investments 184,878 217,044
Fair Value [Member] | Fair Value, Measurements, Recurring [Member]
    
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
Total assets 3,613,214 3,274,984
Fair Value [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 294,214 [1] 353,796 [1]
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 30,292 34,173
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 784,501 622,659
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 1,425,888 1,213,310
Fair Value [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 121,154 78,949
Fair Value [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 129,615 112,598
Fair Value [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 484,296 481,888
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 130,435 [2] 126,475 [2]
Equity securities, AFS 151,970 [2] 157,355 [2]
Short-term investments 184,878 [2] 217,044 [2]
Receivable for proceeds related to sale of Selective HR 0 [2] 0 [2]
Total assets 467,283 [2] 500,874 [2]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 130,435 [1],[2] 126,475 [1],[2]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 [2] 0 [2]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 [2] 0 [2]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 [2] 0 [2]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 [2] 0 [2]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 [2] 0 [2]
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 [2] 0 [2]
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 3,094,637 [2] 2,746,200 [2]
Equity securities, AFS 0 [2] 0 [2]
Short-term investments 0 [2] 0 [2]
Receivable for proceeds related to sale of Selective HR 0 [2] 0 [2]
Total assets 3,094,637 [2] 2,746,200 [2]
Significant Other Observable Inputs (Level 2) [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 143,804 [1],[2] 205,580 [1],[2]
Significant Other Observable Inputs (Level 2) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 30,292 [2] 34,173 [2]
Significant Other Observable Inputs (Level 2) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 784,501 [2] 622,659 [2]
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 1,423,005 [2] 1,210,707 [2]
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 113,835 [2] 78,949 [2]
Significant Other Observable Inputs (Level 2) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 114,904 [2] 112,244 [2]
Significant Other Observable Inputs (Level 2) [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 484,296 [2] 481,888 [2]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 44,888 24,698
Equity securities, AFS 3,607 0
Short-term investments 0 0
Receivable for proceeds related to sale of Selective HR 2,799 3,212
Total assets 51,294 27,910
Significant Unobservable Inputs (Level 3) [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 19,975 [1] 21,741 [1]
Significant Unobservable Inputs (Level 3) [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 2,883 2,603
Significant Unobservable Inputs (Level 3) [Member] | Asset-backed Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 7,319 0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 14,711 354
Significant Unobservable Inputs (Level 3) [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities $ 0 $ 0
[1] 2 U.S. government includes corporate securities fully guaranteed by the FDIC.
[2] 1 There were no transfers of securities between Level 1 and Level 2.