Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Accrued Liabilities [Abstract]
Accrued liabilities	$ 290,115		$ 290,115		$ 276,118
Accrued rebates	39,046		39,046		49,900
Accrued incentive compensation	43,151		43,151		37,626
Other Liabilities [Abstract]
Other liabilities	170,770		170,770		174,859
Non-current pension obligation	127,235		127,235		$ 136,296
Other Income and Expenses [Abstract]
Interest income	1,631	$ 341	3,383	$ 2,669
Dividend income	0	0	3,328	0
Foreign exchange currency (losses) gains, net	(731)	(6,450)	1,140	(6,695)
Income from equity method investments	664	3,304	5,278	7,244
Impairment of equity method investment	0	0	(4,925)	0
Gain on acquisition and related expenses, net	0	0	20,430	0
Gain from sales of equity securities	0	0	3,795	0
Other	1,072	135	1,361	1,222
Other income (expense), net	$ 2,636	$ (2,670)	$ 33,790	$ 4,440