Commitments and Contingencies - Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period	$ 42,592
Expenditures	(2,560)
Accretion of discount	652
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)	3,857
Foreign currency translation adjustments and other	805
Balance at end of period	$ 42,592	$ 45,346
Less amounts reported in Accrued expenses		9,654
Amounts reported in Other noncurrent liabilities		$ 35,692