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Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2014
Fair Value Measurements [Abstract]  
Balance of assets and liabilities measured at fair value on a recurring basis
The following table presents the balance of assets and liabilities at June 30, 2014 measured at fair value on a recurring basis:
 
   
Level 1 (1)
    
Level 2 (2)
    
Level 3 (3)
    
Total
  
   
(in thousands)
  
Assets:
                        
Derivative contracts
   $ 254     $ 603     $ —     $ 857  
Liabilities:
                                
Derivative contracts
   $ 12     $ 379     $ —     $ 391  
 
 
The following table presents the balance of assets and liabilities at December 31, 2013 measured at fair value on a recurring basis:
 
   
Level 1 (1)
    
Level 2 (2)
    
Level 3 (3)
    
Total
  
   
(in thousands)
  
Assets:
                        
Derivative contracts
   $ 390     $ 1,230     $ 62     $ 1,682  
Liabilities:
                                
Derivative contracts
   $ 13     $ 372     $ —     $ 385  
Summary of the change in the balance of the Company's asset measured at fair value on a recurring basis using significant unobservable inputs
 (in thousands)
   
Balance, December 31, 2013
 $62 
Total losses (realized or unrealized) included in earnings in “Direct cost of revenues”
  (62)
Balance, June 30, 2014
 $— 
The amount of total gains or losses for the period included in earnings in “Direct cost of revenues” attributable to the change in unrealized gains or losses relating to assets held at the end of the period
 $—