Other (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) contract option_plan	Sep. 30, 2015 USD ($) contract option_plan	Sep. 30, 2016 USD ($) contract option_plan	Sep. 30, 2015 USD ($) contract option_plan
Other general expense (income ) - net
Provisions for environmental matters - net	$ 683	$ 7,128	$ 21,219	$ 18,688
Loss (gain) on disposition of assets	130	1,989	(119)	(1,273)
Total	813	9,117	21,100	17,415
Other expense (income) - net
Dividend and royalty income	(1,346)	(313)	(3,511)	(2,433)
Net expense from banking activities	2,161	3,223	6,532	8,387
Foreign currency transaction related losses	3,779	4,100	7,288	6,960
Other income	(7,920)	(4,682)	(18,250)	(15,022)
Other expense	2,601	1,733	7,390	6,601
Total	$ (725)	$ 4,061	$ (551)	$ 4,493
Number of foreign currency options outstanding | option_plan	0	0	0	0
Number of foreign forward contracts outstanding | contract	0	0	0	0