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FINANCIAL INSTRUMENTS AND FAIR VALUE - Roll forward of notional value (Details) (Interest rate swaps, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Interest rate swaps
   
Notional Amount Of Interest Rate Derivatives [Roll Forward]    
Balance, beginning of the period    $ 7,667
New contracts      
Matured contracts    (834)
Balance, end of the period    $ 6,833