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Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Other comprehensive income:    
Foreign currency forward contracts, tax $ 73 $ 32
Pension plan amortization to net income of net actuarial loss and prior service cost, tax $ 13 $ 7