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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2016
Guarantees [Abstract]  
Parental guaranteed obligations
As of December 31, 2016, parental guaranteed obligations are approximately as follows (in thousands):

  
2017
  
2018
  
2019
  
2020
  
Thereafter
  
Total
 
Commodity purchases
 
$
24,210
   
-
   
-
   
-
   
-
  
$
24,210
 
Letters of credit
  
-
   
-
   
-
   
-
   
-
   
-
 
  
$
24,210
  
$
-
  
$
-
  
$
-
  
$
-
  
$
24,210