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Investments (Details 19) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Other Investments [Line Items]    
Other invested assets $ 1,035,809 $ 1,159,543
Equity securities
    
Other Investments [Line Items]    
Other invested assets 160,339 222,700
Limited partnerships and real estate joint ventures
    
Other Investments [Line Items]    
Other invested assets 423,790 356,419
Structured loans
    
Other Investments [Line Items]    
Other invested assets 245,734 306,497
Derivatives
    
Other Investments [Line Items]    
Other invested assets 118,791 168,208
Other
    
Other Investments [Line Items]    
Other invested assets $ 87,155 $ 105,719