Other (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($) contract option_plan	Sep. 30, 2016 USD ($) contract option_plan	Sep. 30, 2017 USD ($) contract option_plan	Sep. 30, 2016 USD ($) contract option_plan
Other general expense (income ) - net
Provisions for environmental matters - net	$ 4,183	$ 683	$ 5,812	$ 21,219
(Gain) loss on sale or disposition of assets	(74)	130	348	(119)
Total	4,109	813	6,160	21,100
Other (income) expense - net
Dividend and royalty income	(3,064)	(1,346)	(6,106)	(3,511)
Net expense from banking activities	2,196	2,161	7,181	6,532
Foreign currency transaction related losses (gains)	571	3,779	(2,039)	7,288
Other income	(12,167)	(7,920)	(23,064)	(18,250)
Other expense	3,798	2,601	9,225	7,390
Total	$ (8,666)	$ (725)	$ (14,803)	$ (551)
Number of foreign currency options outstanding | option_plan	0	0	0	0
Number of foreign forward contracts outstanding | contract	0	0	0	0