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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, 2013
Dec. 31, 2012
Held-to-maturity Securities $ 421,962 $ 554,069
Available-for-sale Secuities 3,633,432 3,296,013
Equity securities, AFS 180,506 151,382
Short-term investments 172,087 214,479
Notes payable 392,407 307,387
Carrying Amount [Member]
    
Held-to-maturity Securities 421,962 554,069
Available-for-sale Secuities 3,633,432 3,296,013
Equity securities, AFS 180,506 151,382
Short-term investments 172,087 214,479
Receivable for proceeds related to sale of Selective HR 0 2,705
Notes payable 392,407 307,387
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
Carrying Amount [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 0 100,000
Carrying Amount [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 99,492 99,475
Carrying Amount [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 49,915 49,912
Carrying Amount [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
    
Notes payable 185,000 0
Fair Value [Member]
    
Held-to-maturity Securities 448,529 594,661
Available-for-sale Secuities 3,633,432 3,296,013
Equity securities, AFS 180,506 151,382
Short-term investments 172,087 214,479
Receivable for proceeds related to sale of Selective HR 0 2,705
Notes payable 364,171 321,061
Fair Value [Member] | Two Point Ninety Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 13,392 13,595
Fair Value [Member] | One Point Twenty Five Percent Borrowing From Federal Home Loan Bank [Member]
    
Notes payable 45,171 45,590
Fair Value [Member] | Seven Point Fifty Percent Junior Notes [Member]
    
Notes payable 0 101,480
Fair Value [Member] | Six Point Seventy Percent Senior Notes [Member]
    
Notes payable 100,200 107,707
Fair Value [Member] | Seven Point Twenty Five Percent Senior Notes [Member]
    
Notes payable 51,858 52,689
Fair Value [Member] | Five Point Eight Hundred Seventy Five Senior Notes [Member]
    
Notes payable $ 153,550 $ 0