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FINANCIAL INSTRUMENTS AND FAIR VALUE- Gains and losses recognized on derivative financial instruments (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Derivative [Line Items]    
Change in fair value   $ (28)
Interest rate swaps | Interest Expense
   
Derivative [Line Items]    
Periodic settlements    31
Change in fair value    $ (28)