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Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Net Income $ 13,236 $ 14,756 $ 32,457 $ 31,825
Other comprehensive loss:        
Foreign currency translation adjustments (1,702) (8,190) (5,283) (16,012)
Net gain on pension and other postretirement benefits 266 277 799 848
Other comprehensive loss before income tax expense (1,436) (7,913) (4,484) (15,164)
Income tax expense related to items of other comprehensive loss (98) (94) (295) (282)
Other comprehensive loss (1,534) (8,007) (4,779) (15,446)
Comprehensive Income $ 11,702 $ 6,749 $ 27,678 $ 16,379