Summary of Fair Value Measurements on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	$ 14,800	$ 10,286
Derivative Assets
Foreign currency contracts assets	5,548	596
Derivative Liabilities
Foreign currency contracts liabilities	295	1,035
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Cash equivalents	14,800	10,286
Level 2 [Member]
Derivative Assets
Foreign currency contracts assets	5,548	596
Derivative Liabilities
Foreign currency contracts liabilities	$ 295	$ 1,035