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Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Statement of Comprehensive Income [Abstract]    
Net income $ 15,253 $ 14,583
Other comprehensive income:    
Foreign currency translation adjustments 720 3,117
Net gain on pension and other post-retirement benefits 215 195
Other comprehensive income before income tax expense 935 3,312
Income tax expense related to items of other comprehensive income (45) (69)
Other comprehensive income 890 3,243
Comprehensive income $ 16,143 $ 17,826