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Guarantees (Details)
$ in Thousands
Dec. 31, 2016
USD ($)
Commodity Purchases [Member]  
Parental guaranteed obligations [Abstract]  
Commodity purchases, 2017 $ 24,210
Commodity purchases, 2018 0
Commodity purchases, 2019 0
Commodity purchases, 2020 0
Commodity purchases, Thereafter 0
Commodity purchases, Total 24,210
Letters of Credit [Member]  
Parental guaranteed obligations [Abstract]  
Letters of credit, 2017 0
Letters of credit, 2018 0
Letters of credit, 2019 0
Letters of credit, 2020 0
Letters of credit, Thereafter 0
Letters of credit, Total 0
Guarantor Obligation [Member]  
Parental guaranteed obligations [Abstract]  
Guaranteed obligations, 2017 24,210
Guaranteed obligations, 2018 0
Guaranteed obligations, 2019 0
Guaranteed obligations, 2020 0
Guaranteed obligations Thereafter 0
Guaranteed obligations, Total $ 24,210