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Comprehensive Income (Details) (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period $ 2,108,902,000 $ 1,618,153,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (126,717,000)  
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax (5,445,000)  
Other Comprehensive Income Loss Net Of Tax (132,162,000)  
Change in component during the period   (6,351,000)
Balance, End of Period 1,976,740,000 1,611,802,000
Accumulated Currency Translation Adjustments [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period 267,475,000 229,795,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (14,105,000)  
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax 0  
Other Comprehensive Income Loss Net Of Tax (14,105,000)  
Change in component during the period   24,080,000
Balance, End of Period 253,370,000 253,875,000
Unrealized Appreciation Of Securities [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period 1,877,657,000 1,419,318,000
Other Comprehensive Income Loss Before Reclassifications Net Of Tax (112,711,000)  
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax (6,171,000)  
Other Comprehensive Income Loss Net Of Tax (118,882,000)  
Change in component during the period   (30,721,000)
Balance, End of Period 1,758,775,000 1,388,597,000
Pension And Postretirement Benefits [Member]
    
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]    
Balance, Beginning of Period (36,230,000) (30,960,000)
Other Comprehensive Income Loss Before Reclassifications Net Of Tax 99,000  
Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax 726,000  
Other Comprehensive Income Loss Net Of Tax 825,000  
Change in component during the period   290,000
Balance, End of Period $ (35,405,000) $ (30,670,000)