Commitments and Contingencies Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period	$ 34,919
Expenditures	(303)
Accretion of discount	183
Foreign currency translation adjustments and other	640
Balance at end of period	$ 34,919	$ 35,439
Less amounts reported in Accrued expenses		2,345
Amounts reported in Other noncurrent liabilities		$ 33,094