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Consolidated Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Statement Of Income And Comprehensive Income [Abstract]      
Net income $ 67,158 $ 59,379 $ 42,694
Foreign currency translation adjustments 14,826 11,358 (10,160)
Net change in:      
Deferred gains (losses) on cash flow hedges, net of taxes of $178, $638 and $(464), respectively (517) (1,609) 1,185
Unrecognized retirement obligations, net of taxes of $(45,118), $3,914 and $22,672, respectively 74,300 (6,974) (36,519)
Other comprehensive income (loss) 88,609 2,775 (45,494)
Comprehensive income (loss) $ 155,767 $ 62,154 $ (2,800)