Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Accrued Liabilities [Abstract]
Accrued liabilities	$ 312,985		$ 312,985		$ 287,313
Accrued capital expenditures	52,171		52,171		21,597
Accrued incentive compensation	34,813		34,813		41,168
Accrued rebates	31,691		31,691		46,460
Other Liabilities [Abstract]
Other liabilities	139,587		139,587		150,961
Non-current pension obligation	105,554		105,554		$ 106,250
Other Income, Net [Abstract]
Interest income	3,084	$ 866	6,363	$ 1,751
Dividend income	3,845	1,357	4,274	3,329
Foreign exchange currency gains (losses), net	400	(500)	(1,154)	1,871
Income (loss) from equity method investments	988	(350)	2,389	4,613
Impairment of equity method investment	0	(4,925)	0	(4,925)
Gain on acquisition and related expenses, net	0	20,430	0	20,430
Gains from sales of securities, net	1,267	3,795	1,319	3,795
Other	(1,403)	1,385	(2,365)	290
Other income, net	$ 8,181	$ 22,058	$ 10,826	$ 31,154