Environmental Costs (Schedule of Change in Environmental Remediation) (Details) - Accruals and Payable and Other Long Term Liabilties [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at January 1	$ 10,598	$ 11,531
Additions to accrual	4,731	1,865
Payments	(3,714)	(2,465)
Other	0	(307)
Changes in foreign currency exchange rates	(6)	(26)
Balance at December 31	$ 11,609	$ 10,598