Other (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015 USD ($) contract option_plan	Sep. 30, 2014 USD ($) contract option_plan	Sep. 30, 2015 USD ($) contract option_plan	Sep. 30, 2014 USD ($) contract option_plan
Other general expense - net
Provisions for environmental matters - net	$ 7,128	$ 11,209	$ 18,688	$ 11,034
Loss (gain) on disposition of assets	1,989	664	(1,273)	1,037
Total	9,117	11,873	17,415	12,071
Other expense (income) - net
Dividend and royalty income	(313)	(1,287)	(2,433)	(3,533)
Net expense from financing activities	3,223	2,706	8,387	8,175
Foreign currency transaction related losses (gains)	4,100	(481)	6,960	547
Other income	(4,682)	(18,657)	(15,022)	(31,936)
Other expense	1,733	3,126	6,601	7,510
Total	$ 4,061	$ (14,593)	$ 4,493	$ (19,237)
Number of foreign currency options outstanding | option_plan	0	0	0	0
Number of foreign forward contracts outstanding | contract	0	0	0	0