Commitments and Contingencies - Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2019
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period	$ 49,569
Expenditures	(2,080)
Accretion of discount	223
Additions and changes in estimates	1,070
Foreign currency translation adjustments and other	(506)
Balance at end of period	$ 49,569	$ 48,276
Less amounts reported in Accrued expenses		9,826
Amounts reported in Other noncurrent liabilities		$ 38,450