Derivative Instruments and Hedging Activities - Summary of Outstanding Derivative Contracts (Details)	Mar. 31, 2018 MMBTU bbl $ / bbl $ / MMBTU
Crude Oil Contract | NYMEX WTI - Three-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	10,000
Crude Oil Contract | NYMEX WTI - Swaps 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	58,000
Crude Oil Contract | NYMEX WTI - Two-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	18,000
Crude Oil Contract | Dated Brent - Three-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	3,000
Crude Oil Contract | ICE Brent - Swaps 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	2,000
Crude Oil Contract | ICE Brent - Two-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	2,000
Crude Oil Contract | ICE Brent - Three-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	5,000
Crude Oil Contract | Basis Swaps 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	12,000
Weighted Average Differential ($ per bbl)	(0.60)
Crude Oil Contract | NYMEX WTI - Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	31,000
Crude Oil Contract | ICE Brent - Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	5,000
Crude Oil Contract | ICE Brent - Three-Way Collars 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	3,000
Crude Oil Contract | Basis Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	12,000
Crude Oil Contract | NYMEX WTI - Swaption 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl	5,000
Natural Gas Contract | NYMEX HH - Three-Way Collars 2018
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU	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
Derivative [Line Items]
Weighted Average Differential ($ per bbl)	(1.01)
Swaps | Crude Oil Contract | NYMEX WTI - Swaps 2018
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	59.74
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)	57.77
Swaps | Crude Oil Contract | ICE Brent - Swaps 2019
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	57.00
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 - 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 | NYMEX WTI - Two-Way Collars 2018
Derivative [Line Items]
Weighted Average Short Put Price ($ per bbl)	0
Weighted Average Floor Price ($ per bbl)	50.42
Weighted Average Ceiling Price ($ per bbl)	58.82
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 - Two-Way Collars 2018
Derivative [Line Items]
Weighted Average Short Put Price ($ per bbl)	0
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 | 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