Summary of Fair Value Measurements on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	$ 115,846	$ 37,870
Derivative Assets
Foreign currency contracts assets		13,501
Derivative Liabilities
Foreign currency contracts liabilities		984
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	115,846	37,870
Level 2 [Member]
Derivative Assets
Foreign currency contracts assets		13,501
Derivative Liabilities
Foreign currency contracts liabilities		984
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents
Derivative Assets
Foreign currency contracts assets
Derivative Liabilities
Foreign currency contracts liabilities