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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES (Details 2) (Derivatives designated as hedging instruments, USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Fair value of derivative instruments
Derivative liabilities	$ 6,697	$ 4,367
Interest Rate Swaps
Fair value of derivative instruments
Derivative liabilities	$ 6,697	$ 4,367

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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