Derivative Financial Instruments - Commodity Contracts (Details) - $ / bbl	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Put Option [Member] | Period Covered-2017 [Member]
Derivative [Line Items]
Weighted Average Floor Price	50.00	50.00
Total Bbls Hedged/day	1,875	1,932
Derivative, Underlying Basis	WTI	WTI
Put Option [Member] | Period Covered-2018 [Member]
Derivative [Line Items]
Weighted Average Floor Price	45.00	45.00
Total Bbls Hedged/day	164	164
Derivative, Underlying Basis	WTI	WTI
Collar [Member] | Period Covered-2017 [Member]
Derivative [Line Items]
Weighted Average Floor Price	45.00	43.75
Weighted Average Ceiling Price	51.78	50.68
Total Bbls Hedged/day	652	658
Derivative, Underlying Basis	WTI	WTI
Collar [Member] | Period Covered-2018 [Member]
Derivative [Line Items]
Weighted Average Floor Price	44.38	44.38
Weighted Average Ceiling Price	55.52	55.52
Total Bbls Hedged/day	1,315	1,315
Derivative, Underlying Basis	WTI	WTI
Collar [Member] | Period Covered-2019 [Member]
Derivative [Line Items]
Weighted Average Floor Price	50.00	50.00
Weighted Average Ceiling Price	60.52	60.52
Total Bbls Hedged/day	427	427
Derivative, Underlying Basis	WTI	WTI