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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]    
Foreign currency translation adjustment, tax recovery $ 4,532 $ 169
Change in fair value of cash flow hedge, tax recovery and (expense) 952 (599)
Change in pension and other post-employment benefit, tax expense $ 696 $ 512