Derivatives - Fair Value (Details) (Fair Value, Measurements, Recurring [Member], Foreign Exchange Forward [Member], Not Designated as Hedging Instrument [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Level 1 [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange futures contracts fair value	$ 0	$ 0
Level 2 [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange futures contracts fair value	(172)	(13)
Level 3 [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange futures contracts fair value	0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange futures contracts fair value	$ (172)	$ (13)