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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Net income $ 32,750 $ 26,112
Other comprehensive income (loss), net of tax:    
Changes in net prior service credit and actuarial losses 1,851 1,240
Change in fair value of derivatives (156) 2,179
Foreign currency translation 13,699 12,403
Other comprehensive income 15,394 15,822
Comprehensive income $ 48,144 $ 41,934