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Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Statements of Comprehensive Income        
Translation adjustment, tax benefit $ 28 $ 3 $ 31 $ 4