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INTEREST RATE SWAP AGREEMENTS (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 item	Dec. 31, 2012
Liability Derivatives
Fair value of derivative instruments	$ 13,754	$ 7
Fair value of derivative instruments (Noncurrent Liabilities)		16,045
Total Derivatives	13,754	16,052
Number of interest rate swaps previously classified as a long-term liability	1
Interest rate contracts | Derivatives designated as hedging instruments
Liability Derivatives
Fair value of derivative instruments	13,754	7
Fair value of derivative instruments (Noncurrent Liabilities)		16,045
Total Derivatives	$ 13,754	$ 16,052

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