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Unaudited Interim Consolidated Statements of Comprehensive Income (Parenthetical) - 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]        
Foreign currency translation adjustment, tax recovery $ 365 $ 1,178 $ 112 $ 878
Change in fair value of cash flow hedge, tax expense (4,682) (1,701) (5,200) (306)
Change in pension and other post-employment benefit, tax expense $ (141) $ 19 $ (50) $ 56