Segment Information - Summarized Financial Information by Reportable Segments (Footnote) (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2021	Jun. 30, 2020
Segment Reporting Information [Line Items]
Loss on early extinguishment of debt				$ (28,955)	$ 0
Restructuring and other	$ 766	$ 6,733		1,540	8,580
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)				1,576
Cost of goods sold
Segment Reporting Information [Line Items]
Restructuring and other					700
Selling, general and administrative expenses
Segment Reporting Information [Line Items]
Non-routine Chilean labor costs	1,400			6,000
Restructuring and other			$ 6,700		8,200
Gain (Loss) on Disposition of Property Plant Equipment	4,000			4,000
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)	1,600			1,600
Non-controlling Interests
Segment Reporting Information [Line Items]
Restructuring and other					300
Other (expenses) income, net
Segment Reporting Information [Line Items]
Asset Retirement Obligation, Liabilities Incurred				3,600
Settlement of a legal claim					2,700
Revision of tax indemnification expense	(300)				800
Gain on sale of idle properties		$ 900			$ 800
Interest Expense
Segment Reporting Information [Line Items]
Loss on early extinguishment of debt	$ 1,200			$ 29,000