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Comprehensive Income (Details 2) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) $ 2,108,902,000 $ 1,618,153,000 $ 892,184,000 $ 292,306,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 37,680,000 (25,500,000) 51,320,000  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 451,905,000 769,105,000 542,911,000  
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities 6,434,000 (1,236,000) 4,081,000  
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (5,270,000) (16,400,000) 1,566,000  
Accumulated other comprehensive income (loss) 2,108,902,000 1,618,153,000 892,184,000 292,306,000
Accumulated Currency Translation Adjustments [Member]
        
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) 267,475,000 229,795,000 255,295,000 203,975,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 37,680,000 (25,500,000) 51,320,000  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 0 0 0  
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities 0 0 0  
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 0 0 0  
Accumulated other comprehensive income (loss) 267,475,000 229,795,000 255,295,000 203,975,000
Unrealized Appreciation Of Securities [Member]
        
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) 1,877,657,000 1,419,318,000 651,449,000 104,457,000
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 0 0 0  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 451,905,000 769,105,000 542,911,000  
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities 6,434,000 (1,236,000) 4,081,000  
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax 0 0 0  
Accumulated other comprehensive income (loss) 1,877,657,000 1,419,318,000 651,449,000 104,457,000
Pension And Postretirement Benefits [Member]
        
Accumulated Other Comprehensive Income Loss Net Of Tax [Roll Forward]        
Accumulated other comprehensive income (loss) (36,230,000) (30,960,000) (14,560,000) (16,126,000)
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax 0 0 0  
Accumulated Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax 0 0 0  
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities 0 0 0  
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax (5,270,000) (16,400,000) 1,566,000  
Accumulated other comprehensive income (loss) $ (36,230,000) $ (30,960,000) $ (14,560,000) $ (16,126,000)