Derivative Instruments (Impact of Derivative Instruments on Income) (Details) (Derivatives Not Designated As Hedging Instruments, Forward Contracts [Member], Cost of Sales, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Derivatives Not Designated As Hedging Instruments | Forward Contracts [Member] | Cost of Sales
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in Income on Derivative	$ 4,241	$ (611)