Environmental Costs (Schedule of Change in Environmental Remediation) (Details) - Accruals and Payable and Other Long Term Liabilities - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1	$ 11,609	$ 10,598
Additions to accrual	314	4,731
Payments	(1,543)	(3,714)
Other1	(3,779)	0
Changes in foreign currency exchange rates	34	(6)
Balance at December 31	$ 6,635	$ 11,609