Derivatives - Fair Value (Details) - Fair Value, Measurements, Recurring [Member] - Foreign Exchange Forward [Member] - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Estimate of Fair Value Measurement
Derivatives, Fair Value [Line Items]
Foreign currency exchange futures contracts fair value	$ 456	$ 810
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	456	810
Level 3 [Member]
Derivatives, Fair Value [Line Items]
Foreign currency exchange futures contracts fair value	$ 0	$ 0