FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3) (Level 3, USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Fair Value Measurements
Derivative liability	2,223	1,825
Option Pricing Model | Minimum
Fair Value Measurements
Volatility rate (as a percent)	16.30%	16.40%
Option Pricing Model | Maximum
Fair Value Measurements
Volatility rate (as a percent)	17.00%	17.40%
Option Pricing Model | Weighted Average
Fair Value Measurements
Volatility rate (as a percent)	16.30%	16.40%