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Property, plant, and equipment - Supplemental cash flow information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Abstract]      
Property, plant and equipment additions due to build-to-suit lease transactions $ 0 $ 29,448 $ 0