Derivative Instruments and Hedging Activities - Summary of Outstanding Derivative Contracts (Details)	Jun. 30, 2018 bbl / d MMBTU / d $ / bbl $ / MMBTU
Crude Oil Contract | NYMEX WTI - Swaps 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	66,000
Crude Oil Contract | NYMEX WTI - Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	18,000
Crude Oil Contract | NYMEX WTI - Three-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	10,000
Crude Oil Contract | Dated Brent - Three-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	3,000
Crude Oil Contract | ICE Brent - Swaps 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	2,000
Crude Oil Contract | ICE Brent - Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	2,000
Crude Oil Contract | ICE Brent - Three-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	5,000
Crude Oil Contract | Basis Swaps 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	20,000
Weighted Average Differential ($ per bbl)	(2.30)
Crude Oil Contract | NYMEX WTI - Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	44,000
Crude Oil Contract | NYMEX WTI - Three-Way Collars 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	6,000
Crude Oil Contract | ICE Brent - Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	5,000
Weighted Average Fixed Price ($ per bbl)	57.00
Crude Oil Contract | ICE Brent - Three-Way Collars 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	3,000
Crude Oil Contract | Basis Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	27,000
Weighted Average Differential ($ per bbl)	(3.23)
Crude Oil Contract | NYMEX WTI - Swaption 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	5,000
Crude Oil Contract | Basis Swaps 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	15,000
Weighted Average Differential ($ per bbl)	(5.01)
Natural Gas Contract | NYMEX WTI - Swaption 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	120,000
Weighted Average Fixed Price ($ per bbl) | $ / MMBTU	0
Weighted Average Short Put Price ($ per bbl) | $ / MMBTU	2.50
Weighted Average Floor Price ($ per bbl) | $ / MMBTU	2.88
Weighted Average Ceiling Price ($ per bbl) | $ / MMBTU	3.65
Swaps | Crude Oil Contract | NYMEX WTI - Swaps 2018
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	60.30
Swaps | Crude Oil Contract | ICE Brent - Swaps 2018
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	59.00
Swaps | Crude Oil Contract | NYMEX WTI - Swaps 2019
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	58.37
Swaps | Crude Oil Contract | NYMEX WTI - Swaption 2020
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	61.79
Collars | Crude Oil Contract | NYMEX WTI - Collars 2018
Derivative [Line Items]
Weighted Average Floor Price ($ per bbl)	50.42
Weighted Average Ceiling Price ($ per bbl)	58.82
Collars | Crude Oil Contract | NYMEX WTI - Three-Way Collars 2018
Derivative [Line Items]
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
Collars | Crude Oil Contract | Dated Brent - Three-Way Collars 2018
Derivative [Line Items]
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
Collars | Crude Oil Contract | ICE Brent - Collars 2018
Derivative [Line Items]
Weighted Average Floor Price ($ per bbl)	50.00
Weighted Average Ceiling Price ($ per bbl)	55.25
Collars | Crude Oil Contract | ICE Brent - Three-Way Collars 2018
Derivative [Line Items]
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
Collars | Crude Oil Contract | NYMEX WTI - Three-Way Collars 2019
Derivative [Line Items]
Weighted Average Short Put Price ($ per bbl)	50.00
Weighted Average Floor Price ($ per bbl)	60.00
Weighted Average Ceiling Price ($ per bbl)	72.75
Collars | Crude Oil Contract | ICE Brent - Three-Way Collars 2019
Derivative [Line Items]
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