Derivatives and Hedging - Summary of Fair Value of Derivative Instruments by Contract Type and Location of Asset and/or Liability on Consolidated Condensed Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Other Current Assets
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, asset derivatives not designated as hedging instruments, fair value	$ 7,115	$ 5,011
Accounts payable and accrued expenses
Derivatives, Fair Value [Line Items]
Foreign currency exchange contracts, liability derivatives not designated as hedging instruments, fair value	$ 625	$ 1,046