Foreign Currency Derivatives - Offsetting of Derivative Liabilities (Details) (Foreign exchange contract, USD $)
In Thousands, unless otherwise specified
Mar. 15, 2015
Dec. 31, 2014
Foreign exchange contract
   
Offsetting Liabilities [Line Items]    
Gross Amounts of Recognized Liabilities $ 12,651 $ 8,175
Net Amounts Of Liabilities Presented In the Condensed Consolidated Balance Sheets 12,651 8,175
Gross Amounts of Liabilities Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments (12,445) (8,175)
Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount $ 206