Commitments and Contingencies Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of period	$ 34,919
Expenditures	(894)
Accretion of discount	370
Foreign currency translation adjustments and other	1,643
Balance at end of period	$ 34,919	$ 36,038
Less amounts reported in Accrued expenses		2,390
Amounts reported in Other noncurrent liabilities		$ 33,648