Commitments and Contingencies Activity in Recorded Environmental Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance, beginning of year	$ 39,808	$ 34,919	$ 31,436
Expenditures	(6,885)	(1,818)	(2,667)
Accretion of discount	1,283	896	793
Additions and changes in estimates	17,039	3,344	4,004
Foreign currency translation adjustments and other	(1,676)	2,467	1,353
Balance, end of year	$ 39,808	$ 34,919	$ 31,436	$ 49,569	$ 39,808	$ 34,919
Less amounts recorded in Accrued expenses				9,193	2,290	2,324
Amounts reported in Other noncurrent liabilities				$ 40,376	$ 37,518	$ 32,595