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Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Statement of Comprehensive Income [Abstract]        
Net income $ 20,667 $ 18,771 $ 35,920 $ 33,354
Other comprehensive income:        
Foreign currency translation adjustments 1,194 (11,850) 1,914 (8,733)
Net gain on pension and other post-retirement benefits 215 228 430 423
Unrealized loss during the period related to derivatives (12) 0 (12) 0
Other comprehensive income (loss) before income tax expense 1,397 (11,622) 2,332 (8,310)
Income tax expense related to items of other comprehensive income (45) (20) (90) (89)
Other comprehensive income (loss) 1,352 (11,642) 2,242 (8,399)
Comprehensive income $ 22,019 $ 7,129 $ 38,162 $ 24,955