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Fair Value Measurements (Quantitative Disclosures of Fair Value Assets) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
AFS fixed maturity securities $ 3,123,006 $ 2,897,373
Equity securities, AFS 148,117 157,355
Short-term investments 135,823 217,044
Fair Value [Member] | Fair Value, Measurements, Recurring [Member]
    
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
Total assets 3,409,840 3,274,984
Fair Value [Member] | US Government and Government Agencies and Authorities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 287,996 [1] 353,796 [1]
Fair Value [Member] | Foreign Government [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 42,782 34,173
Fair Value [Member] | Obligations of States and Political Subdivisions [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 736,501 622,659
Fair Value [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 1,348,747 1,213,310
Fair Value [Member] | Asset-backed Securities ("ABS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 94,809 78,949
Fair Value [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 118,043 112,598
Fair Value [Member] | Residential Mortgage Backed Securities ("RMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 494,128 481,888
Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 129,555 [2] 126,475 [2]
Equity securities, AFS 144,510 [2] 157,355 [2]
Short-term investments 135,823 [2] 217,044 [2]
Receivable for proceeds related to sale of Selective HR 0 [2] 0 [2]
Total assets 409,888 [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 129,555 [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 ("ABS") [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 2,965,539 [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 2,965,539 [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 138,275 [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 42,782 [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 736,501 [2] 622,659 [2]
Significant Other Observable Inputs (Level 2) [Member] | Corporate Securities [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 1,345,676 [2] 1,210,707 [2]
Significant Other Observable Inputs (Level 2) [Member] | Asset-backed Securities ("ABS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 94,809 [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 113,368 [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 494,128 [2] 481,888 [2]
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 27,912 24,698
Equity securities, AFS 3,607 0
Short-term investments 0 0
Receivable for proceeds related to sale of Selective HR 2,894 3,212
Total assets 34,413 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 20,166 [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 3,071 2,603
Significant Unobservable Inputs (Level 3) [Member] | Asset-backed Securities ("ABS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 0 0
Significant Unobservable Inputs (Level 3) [Member] | Commercial Mortgage-backed Securities ("CMBS") [Member] | Fair Value, Measurements, Recurring [Member]
    
AFS fixed maturity securities 4,675 354
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 in Six Months 2012 and in Six Months 2011.