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CASH FLOW INFORMATION (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
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Dec. 31, 2011
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CASH FLOW INFORMATION    
Number of interest rate swaps 5 8
Derivative asset and liability balances    
Fair value of interest rate swaps in a liability position $ 16,052 $ 25,340
Fair value of interest rate swaps in a liability position classified within current liabilities 7 1,686
Interest rate contracts | Derivatives designated as hedging instruments
    
Derivative asset and liability balances    
Fair value of interest rate swaps in a liability position 16,052 25,340
Fair value of interest rate swaps in a liability position classified within current liabilities $ 7 $ 1,686
Number of derivative instruments in a liability position 5 8