Restructuring - Restructuring and Related Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 10,930	$ 4,973
Joint venture workforce services rendered
Restructuring Cost and Reserve [Line Items]
Restructuring expense	8,218
Professional and other costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense	2,712
Joint Venture
Restructuring Cost and Reserve [Line Items]
Restructuring expense	$ 10,930
Melksham employee severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense		4,163
Asset write-downs & other costs
Restructuring Cost and Reserve [Line Items]
Restructuring expense		810
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring expense		$ 4,973