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Income Taxes - Income taxes expense (benefit) recognized directly in other comprehensive income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Items that will not be reclassified to profit or loss:      
Remeasurements of defined benefit pension plans $ 25 $ 169 $ (15)