v2.4.0.6
HEDGING TRANSACTIONS AND DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Y
Dec. 31, 2011
HEDGING TRANSACTIONS AND DERIVATIVE FINANCIAL INSTRUMENTS    
Fair value of natural gas swap contracts, current liability   $ 0.7
Maximum maturity period of commodity derivative contracts (in years) 1