Hedging - Derivatives Not Designated as Hedging Instruments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Derivative [Line Items]
(Gains) losses on 30 day euro forward contracts				$ 1,677
Cost of sales | 30-day euro forward contracts, settlement period - July 2014
Derivative [Line Items]
(Gains) losses on 30 day euro forward contracts	471	(1,678)	259	264
Gains (losses) from fluctuations in the value of the net monetary assets exposed to euro exchange rates	$ (1,595)	$ (830)	$ (3,946)	$ (5,052)
Not Designated as Hedging Instrument [Member] | 30-day euro forward contracts, settlement period - July 2014
Derivative [Line Items]
Derivative, Term of Contract			30 days