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Derivative Instruments Summary of Outstanding Contracts with Respect to Diesel Fuel (Details)
$ in Thousands, gal in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
$ / gal
Sep. 30, 2016
USD ($)
$ / gal
gal
Sep. 30, 2015
USD ($)
Derivative [Line Items]      
Non-cash gain (loss) on crude oil and natural gas derivatives, net   $ (105,009) $ 26,011
Diesel Fuel [Member]      
Derivative [Line Items]      
Cash received (paid) on derivatives, net $ 100    
Non-cash gain (loss) on crude oil and natural gas derivatives, net $ 500 $ 2,600  
Diesel Fuel [Member] | July 2016 to December 2017 Swaps [Member]      
Derivative [Line Items]      
Diesel Fuel Derivative Volume, gallons | gal   15  
Swaps Weighted Average Price | $ / gal 1.42 1.42