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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Comprehensive Income Net Of Tax Abstract    
Net income $ 185,535,000 $ 123,318,000
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease Abstract    
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax (14,105,000) 24,080,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax (119,333,000) (35,415,000)
Change In Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income 451,000 4,694,000
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax 825,000 290,000
Total other comprehensive income (132,162,000) (6,351,000)
Comprehensive income $ 53,373,000 $ 116,967,000