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Condensed Consolidated Statements of Comprehensive Income (unaudited) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Condensed Consolidated Statements of Comprehensive Income [Abstract]      
Net earnings $ 483,360 $ 427,247 $ 322,580
Comprehensive income, net of tax      
Foreign currency translation adjustments 23,633 (10,178) (19,967)
Unrecognized Pension Gain 1,104 0 0
Total other comprehensive income, net of tax 24,737 (10,178) (19,967)
Comprehensive income $ 508,097 $ 417,069 $ 302,613