Commodity Price Risk Activities - Additional Information (Details)	9 Months Ended
	Sep. 30, 2016 bbl / d DeliveryObligation bbl
Derivative [Line Items]
Number of open physical obligations | DeliveryObligation	0
Derivative Contracts, remainder of 2016
Derivative [Line Items]
Derivative contracts, aggregate volume | bbl	232,550
Derivative contracts, aggregate volume per day | bbl / d	2,528
Derivative Contracts, 2017
Derivative [Line Items]
Derivative contracts, aggregate volume | bbl	547,600
Derivative contracts, aggregate volume per day | bbl / d	1,500