DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	$ 4,409,000	$ 8,204,000
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	(497,000)	(674,000)
Amount and Location of (Losses) Recognized in Income (Loss) on Derivatives (Ineffective Portion)	368,000	646,000
Cash flow hedges
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Expected reclassification out of accumulated other comprehensive income (loss) into earnings during the next twelve months	600,000
Cash flow hedges | Interest rate swaps
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)		(73,000)
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)		(854,000)
Cash flow hedges | Inflation
Gain (Loss) on Derivatives in Cash Flow Hedging Relationship
Amount of Gains (Losses) Deferred in Accumulated Other Comprehensive Income (Loss) on Derivatives (Effective Portion)	4,409,000	8,277,000
Amount and Location of Gains (Losses) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income (Loss) (Effective Portion)	(497,000)	180,000
Amount and Location of (Losses) Recognized in Income (Loss) on Derivatives (Ineffective Portion)	$ 368,000	$ 646,000