DERIVATIVE INSTRUMENTS (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended		3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 InterestRateSwapMember	Jun. 30, 2011 InterestRateSwapMember
Fair value of derivative instruments
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)
Amount of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)	2,728	2,060	1,515	690
Location of Gain (Loss) Recognized in Income on Derivative (Ineffective Portion)	Other income/ (expense)	Other income/ (expense)	Other income/ (expense)	Other income/ (expense)
Amount of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	$ (551)	$ (612)	$ (276)	$ (306)
Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	Interest income/(expense)	Interest income/(expense)	Interest income/(expense)	Interest income/(expense)