Commitments and Contingencies - Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period	$ 42,592
Expenditures	(2,364)
Accretion of discount	413
Foreign currency translation adjustments and other	139
Balance at end of period	$ 42,592	$ 40,780
Less amounts reported in Accrued expenses		9,381
Amounts reported in Other noncurrent liabilities		$ 31,399