DERIVATIVE FINANCIAL INSTRUMENTS (Details 2) (Cash Flow Hedge Relationship, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Effect of derivatives in cash flow hedging relationships on the consolidated statement of income
Before - Tax Loss Recognized in OCI on Derivative (Effective Portion)	$ (41)	$ (2,868)	$ (5,176)
Before - Tax Loss Reclassified from AOCI into Income (Effective Portion)	(4,237)	(10,284)	(5,226)
Before - Tax Loss Recognized in Income on Derivative (Ineffective Portion)		(1,177)
Interest rate swap contracts
Effect of derivatives in cash flow hedging relationships on the consolidated statement of income
Before - Tax Loss Recognized in OCI on Derivative (Effective Portion)	(41)	(2,868)	(5,176)
Before - Tax Loss Reclassified from AOCI into Income (Effective Portion)	(4,237)	(10,284)	(5,226)
Before - Tax Loss Recognized in Income on Derivative (Ineffective Portion)		$ (1,177)