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Guarantees (Tables)
12 Months Ended
Dec. 31, 2013
Guarantees [Abstract]  
Parental guaranteed obligations
As of December 31, 2013, parental guaranteed obligations are approximately as follows (in thousands):

   
2014
  
2015
  
2016
  
2017
  
Thereafter
  
Total
 
Commodity purchases
 $78,747   -   -   -   -   78,747 
Letters of credit
  14,600   -   -   -   -   14,600 
   $93,347  $-  $-  $-  $-  $93,347