Property, Plant and Equipment - Depreciation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment
Depreciation	$ 95,300	$ 172,600	$ 166,200
Capital lease obligations	0	0
Accounts payable	41,080	53,147
Inventory to property, plant and equipment transfer amount	8,600	20,800
Property and Equipment
Property, Plant and Equipment
Accounts payable	$ 3,900	$ 6,800	$ 14,800