Quarterly report pursuant to Section 13 or 15(d)

Derivative Financial Instruments - Estimated Fair Value of Derivative Contracts (Details)

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Derivative Financial Instruments - Estimated Fair Value of Derivative Contracts (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Prepaid Expenses And Other Assets    
Derivatives Fair Value [Line Items]    
Fair value of commodity derivative contracts $ 112 $ 7,672
Accrued Liabilities    
Derivatives Fair Value [Line Items]    
Fair value of commodity derivative contracts $ 47