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Comprehensive Income (Details) (USD $)
 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period $ 1,618,153,000 $ 892,184,000
Change in component during the period 533,494,000 403,607,000
Balance, End of Period 2,151,647,000 1,295,791,000
Accumulated Currency Translation Adjustments [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period 229,795,000 255,295,000
Change in component during the period 43,463,000 (65,948,000)
Balance, End of Period 273,258,000 189,347,000
Unrealized Appreciation Of Securities [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period 1,419,318,000 651,449,000
Change in component during the period 488,194,000 468,275,000
Balance, End of Period 1,907,512,000 1,119,724,000
Pension And Postretirement Benefits [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period (30,960,000) (14,560,000)
Change in component during the period 1,837,000 1,280,000
Balance, End of Period $ (29,123,000) $ (13,280,000)