Derivative Financial Instruments and Risk Management (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013	Jun. 30, 2012
Derivative, Gain (Loss) on Derivative, Net, Total	$ 3,856		$ 2,335		$ 3,999	$ 4,848
Foreign currency forward contracts [Member] | Cost of goods sold [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	631	[1]	(252)	[1]	878	(609)
Interest rate swaps [Member] | Interest expense, net [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	(16)	[2]	(17)	[2]	(32)	(34)
Aluminum futures [Member] | Cost of goods sold [Member]
Derivative, Gain (Loss) on Derivative, Net, Total	$ 3,241	[3]	$ 2,604	[3]	$ 3,153	$ 5,491

[1] Fair value hedge: the related hedged item is accounts receivable and offsetting losses in 2013 and gains in 2012 are included in cost of goods sold in the same respective amounts.

[2] Cash flow hedge: recognized losses reclassified from accumulated other comprehensive loss.

[3] Fair value hedge: the related hedged item is inventory and offsetting losses in 2013 and 2012 are included in cost of goods sold in the same respective amounts.