Derivative Instruments and Hedging Activities (Details)	Aug. 03, 2017 bbl / d $ / bbl	Jun. 30, 2017 bbl / d $ / bbl
Crude Oil Commodity Contract | Call - NYMEX WTI 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		3,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		0.00
Weighted Average Floor Price ($ per bbl)		0.00
Weighted Average Ceiling Price ($ per bbl)		57.00
Crude Oil Commodity Contract | Three Way Collars - ICE Brent 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		2,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		43.00
Weighted Average Floor Price ($ per bbl)		50.00
Weighted Average Ceiling Price ($ per bbl)		63.15
Crude Oil Commodity Contract | Three Way Collars - NYMEX WTI 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		24,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		39.08
Weighted Average Floor Price ($ per bbl)		47.71
Weighted Average Ceiling Price ($ per bbl)		61.20
Crude Oil Commodity Contract | Two Way Collars - NYMEX WTI 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		10,837
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		0.00
Weighted Average Floor Price ($ per bbl)		40.80
Weighted Average Ceiling Price ($ per bbl)		52.71
Crude Oil Commodity Contract | Swaps - NYMEX WTI 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		4,348
Weighted Average Fixed Price ($ per bbl)		50.83
Weighted Average Short Put Price ($ per bbl)		0.00
Weighted Average Floor Price ($ per bbl)		0.00
Weighted Average Ceiling Price ($ per bbl)		0.00
Crude Oil Commodity Contract | Three Way Collars - Dated Brent 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		2,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		35.00
Weighted Average Floor Price ($ per bbl)		45.00
Weighted Average Ceiling Price ($ per bbl)		66.33
Crude Oil Commodity Contract | Three Way Collars - NYMEX WTI 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		10,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		45.50
Weighted Average Floor Price ($ per bbl)		52.50
Weighted Average Ceiling Price ($ per bbl)		69.09
Crude Oil Commodity Contract | Three Way Collars - Dated Brent 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		3,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		40.00
Weighted Average Floor Price ($ per bbl)		50.00
Weighted Average Ceiling Price ($ per bbl)		70.41
Crude Oil Commodity Contract | Swaptions - NYMEX WTI 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		3,000
Weighted Average Fixed Price ($ per bbl)		56.10
Weighted Average Short Put Price ($ per bbl)		0.00
Weighted Average Floor Price ($ per bbl)		0.00
Weighted Average Ceiling Price ($ per bbl)		0.00
Natural Gas Commodity Contract | Three Way Collars - NYMEX HH 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		110,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		2.58
Weighted Average Floor Price ($ per bbl)		2.93
Weighted Average Ceiling Price ($ per bbl)		3.65
Natural Gas Commodity Contract | Two Way Collars - NYMEX HH 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		70,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		0.00
Weighted Average Floor Price ($ per bbl)		2.93
Weighted Average Ceiling Price ($ per bbl)		3.32
Natural Gas Commodity Contract | Three Way Collars - NYMEX HH 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		120,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		2.50
Weighted Average Floor Price ($ per bbl)		2.88
Weighted Average Ceiling Price ($ per bbl)		3.65
Natural Gas Commodity Contract | Swaptions - NYMEX HH 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		30,000
Weighted Average Fixed Price ($ per bbl)		3.36
Weighted Average Short Put Price ($ per bbl)		0.00
Weighted Average Floor Price ($ per bbl)		0.00
Weighted Average Ceiling Price ($ per bbl)		0.00
Second half 2017 | Crude Oil Commodity Contract | Call - NYMEX WTI 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		3,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		0.00
Weighted Average Floor Price ($ per bbl)		0.00
Weighted Average Ceiling Price ($ per bbl)		60.12
Second half 2017 | Crude Oil Commodity Contract | Three Way Collars - ICE Brent 2017
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d		5,000
Weighted Average Fixed Price ($ per bbl)		0.00
Weighted Average Short Put Price ($ per bbl)		43.00
Weighted Average Floor Price ($ per bbl)		50.00
Weighted Average Ceiling Price ($ per bbl)		64.00
2018, calendar year | Crude Oil Commodity Contract | Three Way Collars - ICE Brent 2017 | Subsequent Event
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	5,000
Weighted Average Short Put Price ($ per bbl)	43.00
Weighted Average Floor Price ($ per bbl)	50.00
Weighted Average Ceiling Price ($ per bbl)	59.50
2018, calendar year | Crude Oil Commodity Contract | Two Way Collars - ICE Brent 2017 | Subsequent Event
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	2,000
Weighted Average Floor Price ($ per bbl)	50.00
Weighted Average Ceiling Price ($ per bbl)	55.25
2019, calendar year | Crude Oil Commodity Contract | Three Way Collars - ICE Brent 2017 | Subsequent Event
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	3,000
Weighted Average Short Put Price ($ per bbl)	43.00
Weighted Average Floor Price ($ per bbl)	50.00
Weighted Average Ceiling Price ($ per bbl)	64.07