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Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period $ 1,618,153 $ 892,184
Change in component during the period 181,045 152,040
Balance, End of Period 1,799,198 1,044,224
Accumulated Currency Translation Adjustments [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period 229,795 255,295
Change in component during the period 7,215 35,894
Balance, End of Period 237,010 291,189
Unrealized Appreciation Of Securities [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period 1,419,318 651,449
Change in component during the period 172,329 115,574
Balance, End of Period 1,591,647 767,023
Pension And Postretirement Benefits [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period (30,960) (14,560)
Change in component during the period 1,501 572
Balance, End of Period $ (29,459) $ (13,988)