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Interim Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Statement of Comprehensive Income [Abstract]    
Foreign currency translation adjustment $ (115) $ 0
Net gain on pension and other post-retirement benefits (67) (52)
Unrealized gain (loss) on derivative instruments $ 578 $ (1,308)