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Consolidated Statements Of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements Of Comprehensive Income [Abstract]      
Net income $ 28,251 $ 24,855 $ 27,027
Other comprehensive income (loss):      
Unrealized foreign currency translation adjustment (net of tax benefit) (11,562) (9,098) (2,678)
Reclassification adjustment of foreign currency translation gain included in income (net of tax)   (2,781)  
Derivative financial instruments adjustment (net of tax benefit) 1,399 (686) (478)
Net gains or losses and prior service costs (net of tax benefit) (19,285) (34,664) (2,838)
Amortization of prior service costs and net gains or losses (net of tax) 6,486 3,863 2,995
Other comprehensive income (loss) (22,962) (43,366) (2,999)
Comprehensive income (loss) $ 5,289 $ (18,511) $ 24,028