Commitments and Contingencies - Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period	$ 34,919
Expenditures	(1,320)
Accretion of discount	563
Foreign currency translation adjustments and other	2,384
Balance at end of period	$ 34,919	$ 36,546
Less amounts reported in Accrued expenses		2,476
Amounts reported in Other noncurrent liabilities		$ 34,070