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Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2013
Commodity contracts
Cost of revenue
Sep. 30, 2013
Commodity contracts
Cost of revenue
Sep. 30, 2012
Earn-out
Other (expense) income, net
Sep. 30, 2012
Commodity contracts
Revenue
Sep. 30, 2012
Commodity contracts
Revenue
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs            
Total Gains (Losses) Included in Earnings         $ 2,060 $ 2,060
Settlements         313 313
End of Period         1,747 1,747
Change in Unrealized Gains Relating to Assets that are Held at end of Period         1,747 1,747
Beginning of Period   89   4,194    
Total Gains (Losses) Included in Earnings   69 (20) (110)    
Settlements   20 20 4,304    
Fair value of asset (liability) transfers between Level 1, 2 or 3 0          
Level 3 purchases, sales or issuances of assets (liabilities) $ 0