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Investments (Details 16) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Other Investments [Line Items]    
Other invested assets $ 940,605 $ 1,012,541
Equity Securities [Member]
    
Other Investments [Line Items]    
Other invested assets 79,197 113,900
Limited Partner [Member]
    
Other Investments [Line Items]    
Other invested assets 300,385 251,315
Secured Debt [Member]
    
Other Investments [Line Items]    
Other invested assets 238,367 281,022
Gain (Loss) on Derivatives [Member]
    
Other Investments [Line Items]    
Other invested assets 250,460 257,050
Other [Member]
    
Other Investments [Line Items]    
Other invested assets $ 72,196 $ 109,254