Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Accrued Liabilities [Abstract]
Accrued liabilities	$ 251,680		$ 251,680		$ 276,118
Accrued rebates	30,428		30,428		49,900
Accrued incentive compensation	34,278		34,278		37,626
Other Liabilities [Abstract]
Other liabilities	162,777		162,777		174,859
Non-current pension obligation	126,708		126,708		$ 136,296
Other Income and Expenses [Abstract]
Interest income	866	$ 1,105	1,751	$ 2,328
Dividend income	1,357	0	3,329	0
Foreign exchange currency (losses) gains, net	(500)	3	1,871	(245)
(Loss) income from equity method investments	(350)	1,920	4,613	3,941
Impairment of equity method investment	(4,925)	0	(4,925)	0
Gain on acquisition and related expenses, net	20,430	0	20,430	0
Gain from sales of equity securities	3,795	0	3,795	0
Other	1,385	1,573	290	1,086
Other income, net	$ 22,058	$ 4,601	$ 31,154	$ 7,110