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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2013
Fair Value Measurements  
Fair value measurements of financial assets and liabilities

  The financial assets and liabilities carried at fair value on a recurring basis at December 31, 2013 are as follows (in thousands):

Financial assets and liabilities
  Fair Value   Level 2   Level 3  

Interest-rate swap asset(1)

   $ 2,325   $ 2,325   $ —  

Interest-rate swap liabilities(1)

     (8,384 )   (8,384 )   —  

Currency swap liabilities(1)

     (2,756 )   (2,756 )   —  

Warrants(1)

     114     —     114  
               

 

   $ (8,701 ) $ (8,815 ) $ 114  
               
               
(1)
Interest rate and currency swaps as well as common stock warrant fair values are determined based on observable and unobservable market assumptions utilizing standardized derivative pricing models.