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Fair Value Measurements (Tables)
 12 Months Ended
Dec. 31, 2012
Fair Value Measurements  
Schedule of assets and liabilities measured at estimated fair value on a recurring basis

The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2012 and 2011 (in thousands):

 
   Level 1
   Level 2
   Level 3
   Sub-Total
   Netting
and
Collateral
   Total
  
   
2012                                       
Assets:                                      
Commodity contracts   $ 18,087   $ 57,682   $ —   $ 75,769   $ (56,115)   $ 19,654  
Foreign currency contracts     —     2,434     —     2,434     (2,289)     145  
Hedged item inventories     —     818     —     818     —     818  
   
    $ 18,087   $ 60,934   $ —   $ 79,021   $ (58,404)   $ 20,617  
   

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commodity contracts   $ 20,970   $ 44,732   $ —   $ 65,702   $ (49,562)   $ 16,140  
Foreign currency contracts     —     3,845     —     3,845     (2,289)     1,556  
Hedged item inventories     —     525     —     525     —     525  
   
    $ 20,970   $ 49,102   $ —   $ 70,072   $ (51,851)   $ 18,221  
   

2011  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Assets:                                      
Commodity contracts   $ 14,038   $ 51,033   $ —   $ 65,071   $ (43,275)   $ 21,796  
Foreign currency contracts     —     2,994     —     2,994     (893)     2,101  
Hedged item inventories     —     3,216     —     3,216     —     3,216  
Hedged item commitments     —     206     —     206     —     206  
   
    $ 14,038   $ 57,449   $ —   $ 71,487   $ (44,168)   $ 27,319  
   

Liabilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Commodity contracts   $ 10,148   $ 46,754   $ —   $ 56,902   $ (43,291)   $ 13,611  
Foreign currency contracts     —     1,018     —     1,018     (893)     125  
Hedged item commitments     —     24     —     24     —     24  
Earn-out     —     —     4,194     4,194     —     4,194  
   
    $ 10,148   $ 47,796   $ 4,194   $ 62,138   $ (44,184)   $ 17,954  
   
Schedule of assets and liabilities that are measured at fair value on a recurring basis that utilized Level 3 inputs

The following table presents information about our assets and liabilities that are measured at fair value on a recurring basis that utilized Level 3 inputs for the periods presented (in thousands):

 
   Beginning
of Period
   Total Gains
(Losses)
Included in
Earnings
   Settlements
   End
of Period
   Change in
Unrealized
Gains
Relating to
Assets and
Liabilities
that are
Held at
end of
Period
   Location of
Total Gains
(Losses)
Included in
Earnings
 
2012                                   
Assets:                                  
Commodity contracts   $ —   $ 1,271   $ 1,271   $ —   $ —   Revenue
     
Liabilities:                                  
Earn-out   $ 4,194   $ (110)   $ 4,304   $ —   $ —   Other income
(expense), net
     

2011  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Assets:                                  
Commodity contracts   $ 90   $ —   $ 90   $ —   $ —   Revenue
     
Liabilities:                                  
Earn-out   $ 5,012   $ 818   $ —   $ 4,194   $ 818   Other income
(expense), net