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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Statement of Comprehensive Income [Abstract]      
Net income $ 40,045 $ 43,209 $ 41,151
Other comprehensive (loss) income:      
Foreign currency translation adjustment (13,156) (20,112) (16,331)
Net gain (loss) on pension and other post-retirement benefits 2,369 544 (4,938)
Other comprehensive (loss) before income tax (benefit) expense (10,787) (19,568) (21,269)
Income tax (expense) benefit related to items of other comprehensive (loss) income (890) (152) 1,872
Other comprehensive (loss) (11,677) (19,720) (19,397)
Comprehensive income $ 28,368 $ 23,489 $ 21,754