Other (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($) contract option_plan	Jun. 30, 2015 USD ($) contract option_plan	Jun. 30, 2016 USD ($) contract option_plan	Jun. 30, 2015 USD ($) contract option_plan
Other general expense (income ) - net
Provisions for environmental matters - net	$ 2,507	$ 10,510	$ 20,536	$ 11,560
Loss (gain) on disposition of assets	226	(539)	(249)	(3,262)
Total	2,733	9,971	20,287	8,298
Other expense (income) - net
Dividend and royalty income	(999)	(1,039)	(2,165)	(2,120)
Net expense from banking activities	2,108	2,197	4,371	5,164
Foreign currency transaction related losses	1,819	1,722	3,509	2,860
Other income	(5,450)	(4,843)	(10,330)	(10,340)
Other expense	2,470	2,640	4,789	4,868
Total	$ (52)	$ 677	$ 174	$ 432
Number of foreign currency options outstanding | option_plan	0	0	0	0
Number of foreign forward contracts outstanding | contract	0	0	0	0