Property, plant and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 676,253		$ 676,347
Less: accumulated depreciation	(212,088)		(200,772)
Property, plant and equipment, net	464,165		475,575
Depreciation expense	12,200	$ 12,800
Machinery and equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	408,063		398,127
Land, buildings and improvements
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	240,894		240,403
Other equipment
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	8,666		8,660
Construction-in-progress
Property, Plant and Equipment [Line Items]
Total property, plant and equipment	$ 18,630		$ 29,157