Hedging - Derivatives Not Designated as Hedging Instruments (Details) (30-day euro forward contracts, settlement period - July 2014, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Cost of sales
Derivative [Line Items]
(Gains) losses on 30 day euro forward contracts	$ 5,351	$ (3,288)	$ 5,610	$ (3,024)
Gains (losses) from fluctuations in the value of the net monetary assets exposed to euro exchange rates	$ (8,095)	$ 5,384	$ (12,041)	$ 332
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Derivative, Term of Contract			30 days