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Investments (Details 21) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Other Investments [Line Items]    
Other invested assets $ 1,236,616,000 $ 1,012,541,000
Equity Securities [Member]
    
Other Investments [Line Items]    
Other invested assets 209,272,000 113,900,000
Limited Partner [Member]
    
Other Investments [Line Items]    
Other invested assets 350,643,000 251,315,000
Secured Debt [Member]
    
Other Investments [Line Items]    
Other invested assets 341,795,000 281,022,000
Gain (Loss) on Derivatives [Member]
    
Other Investments [Line Items]    
Other invested assets 212,322,000 257,050,000
Other [Member]
    
Other Investments [Line Items]    
Other invested assets $ 122,584,000 $ 109,254,000