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Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Condensed Consolidated Statements of Comprehensive Income (unaudited) [Abstract]    
Net earnings $ 124,914 $ 108,309
Comprehensive income, net of tax    
Foreign currency translation adjustments (38,489) 19,161
Total other comprehensive income, net of tax (38,489) 19,161
Comprehensive income $ 86,425 $ 127,470