Supplemental Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accrued Liabilities
Accrued liabilities	$ 276,118		$ 155,245
Accrued rebates	31,039		26,399
Accrued Incentive Compensation, Current	56,487		32,374
Other Liabilities [Abstract]
Other liabilities	174,859		35,593
Non-current pension obligation	136,296		8,710
Other Income, Net
Interest income	3,468		3,086		4,010
Foreign exchange currency losses, net	(7,382)	[1]	(1,375)	[1]	(1,201)	[1]
Income from equity method investees	5,883		4,914		1,444
Impairment of equity method investment	(6,747)		0		0
Other	2,057		165		(733)
Other (expense) income, net	(2,721)		6,790		3,520
Cash Flow Information
Interest paid, net of interest capitalized	35,336		16,426		42,266
Income taxes paid	314,745		251,599		179,882
Fair value of assets acquired	961,823		188,930
Cash paid	(736,224)		(178,309)
Liabilities assumed	$ 225,599		$ 10,621

[1] Aggregate foreign exchange currency gains and losses included in the consolidated statements of operations for the years ended December 31, 2014, 2013 and 2012.