Foreign Currency Derivatives - Derivative Instruments Measured at Gross Fair Value as Reflected in Condensed Consolidated Balance Sheets (Details) (Foreign exchange contract, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Derivatives Fair Value [Line Items]
Derivative assets	$ 10,454		$ 6,748
Derivative liabilities	5,262		6,780
Designated as Hedge Instruments
Derivatives Fair Value [Line Items]
Derivative assets	5,122	[1]	4,457	[1]
Derivative liabilities	3,281	[2]	4,235	[2]
Not Designated as Hedging Instrument
Derivatives Fair Value [Line Items]
Derivative assets	5,332	[1]	2,291	[1]
Derivative liabilities	$ 1,981	[2]	$ 2,545	[2]

[1] All derivative assets are recorded in “Prepaid and other current assets” in the condensed consolidated balance sheets.

[2] All derivative liabilities are recorded in “Other accrued liabilities” in the condensed consolidated balance sheets.