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Financial Instruments - Effective Portion of Unrealized Gain and Loss (Details) (Interest rate swaps, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Interest rate swaps
   
Derivatives designated as and not designated as cash flow hedges:    
Effective portion recognized in Accumulated OCL, Gain/(Loss) $ (182) $ (2,147)
Reclassified from Accumulated OCL, Gain/(Loss) 649 528
Derivative, Gain (Loss) on Derivative, Net 468  
Ineffective portion and amount excluded from effectiveness testing, Gain/(Loss)   $ 0