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INTEREST RATE SWAP AGREEMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Liability Derivatives    
Fair value of derivative instruments $ 609 $ 1,686
Fair value of derivative instruments (Noncurrent Liabilities) 18,261 23,654
Interest rate contracts | Derivatives designated as hedging instruments
   
Liability Derivatives    
Fair value of derivative instruments 609 1,686
Fair value of derivative instruments (Noncurrent Liabilities) 18,261 23,654
Total Derivatives $ 18,870 $ 25,340