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CASH FLOW INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013 item	Dec. 31, 2012 item
CASH FLOW INFORMATION
Number of interest rate swaps	4	5
Derivative asset and liability balances
Fair value of interest rate swaps in a liability position	$ 13,754	$ 16,052
Fair value of interest rate swaps in a liability position classified within current liabilities	13,754	7
Interest rate contracts | Derivatives designated as hedging instruments
Derivative asset and liability balances
Fair value of interest rate swaps in a liability position	13,754	16,052
Fair value of interest rate swaps in a liability position classified within current liabilities	$ 13,754	$ 7
Number of derivative instruments in a liability position	4	5

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