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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2014
Fair Value Measurements [Abstract]  
Schedule of Summarized Assets and Liabilities Measured at Fair Value on Recurring Basis
The following table summarizes the assets and liabilities measured at fair value on a recurring basis at December 31, 2013 (in thousands):

  
Quoted Prices in Active Markets for Identical Assets
(Level 1)
  
Significant Other Observable Inputs
(Level 2)
  
Significant Unobservable Inputs
(Level 3)
  
Total Fair Value Measurements
 
December 31, 2013:
        
Assets:
        
Derivatives
 
$
—
  
$
—
  
$
—
  
$
—
 
                 
Liabilities:
                
Derivatives
 
$
—
  
$
59
  
$
—
  
$
59
 
Contingent liabilities
  
—
   
—
   
4,903
   
4,903
 
  
$
—
  
$
59
  
$
4,903
  
$
4,962