FAIR VALUE OF FINANCIAL INSTRUMENTS - Summary of financial instruments measured at fair value on recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Level 1
Derivative financial instruments
Derivative financial asset
Derivative financial liabilities
Level 2
Derivative financial instruments
Derivative financial asset	509	326
Derivative financial liabilities	170	326
Level 3
Derivative financial instruments
Derivative financial asset
Derivative financial liabilities
Total
Derivative financial instruments
Derivative financial asset	509	326
Derivative financial liabilities	170	326
Foreign currency contracts | Level 1
Derivative financial instruments
Derivative financial asset
Derivative financial liabilities
Foreign currency contracts | Level 2
Derivative financial instruments
Derivative financial asset	509	326
Derivative financial liabilities	170	326
Foreign currency contracts | Level 3
Derivative financial instruments
Derivative financial asset
Derivative financial liabilities
Foreign currency contracts | Total
Derivative financial instruments
Derivative financial asset	509	326
Derivative financial liabilities	$ 170	$ 326