Derivative Instruments and Hedging Activities - Summary of Outstanding Derivative Contracts (Details)	Sep. 30, 2019 bbl / d MMBTU / d $ / bbl $ / MMBTU
Crude Oil Contract | NYMEX WTI - Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	35,000
Crude Oil Contract | NYMEX WTI - Three-Way Collars 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	33,000
Crude Oil Contract | NYMEX WTI - Sold Calls 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	4,000
Crude Oil Contract | ICE Brent - Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	5,000
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
Crude Oil Contract | NYMEX WTI - Swaption 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	12,000
Crude Oil Contract | NYMEX WTI - Sold Calls 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	8,000
Crude Oil Contract | NYMEX WTI - Swaps 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	28,000
Crude Oil Contract | NYMEX WTI - Three-Way Collars 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	30,000
Crude Oil Contract | Basis Swaps 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | bbl / d	15,000
Natural Gas Contract | NYMEX HH - Three-Way Collars 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	104,000
Natural Gas Contract | NYMEX HH - Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	46,000
Natural Gas Contract | CIG - Basis Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	123,500
Natural Gas Contract | WAHA - Basis Swaps 2019
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	47,500
Natural Gas Contract | NYMEX HH - Swaps 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	90,000
Natural Gas Contract | NYMEX HH - Sold Puts 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	90,000
Natural Gas Contract | NYMEX HH - Swaption 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	90,000
Natural Gas Contract | CIG - Basis Swaps 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	54,000
Natural Gas Contract | WAHA - Basis Swaps 2020
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	49,500
Natural Gas Contract | WAHA - Basis Swaps 2021
Derivative [Line Items]
Bbls Per Day (Bbls per day) | MMBTU / d	14,000
Swaps | Crude Oil Contract | NYMEX WTI - Swaps 2019
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	59.04
Swaps | Crude Oil Contract | NYMEX WTI - Sold Calls 2019
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	60.00
Swaps | Crude Oil Contract | ICE Brent - Swaps 2019
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	57.00
Swaps | Crude Oil Contract | Basis Swaps 2019
Derivative [Line Items]
Weighted Average Differential ($ per bbl)	(3.23)
Swaps | Crude Oil Contract | NYMEX WTI - Swaption 2020
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	59.73
Swaps | Crude Oil Contract | NYMEX WTI - Sold Calls 2020
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	65.59
Swaps | Crude Oil Contract | NYMEX WTI - Swaps 2020
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl)	58.09
Swaps | Crude Oil Contract | Basis Swaps 2020
Derivative [Line Items]
Weighted Average Differential ($ per bbl)	(5.01)
Swaps | Natural Gas Contract | NYMEX HH - Swaps 2019
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl) | $ / MMBTU	3.00
Swaps | Natural Gas Contract | CIG - Basis Swaps 2019
Derivative [Line Items]
Weighted Average Differential ($ per bbl) | $ / MMBTU	(0.64)
Swaps | Natural Gas Contract | WAHA - Basis Swaps 2019
Derivative [Line Items]
Weighted Average Differential ($ per bbl) | $ / MMBTU	(1.28)
Swaps | Natural Gas Contract | NYMEX HH - Swaps 2020
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl) | $ / MMBTU	2.60
Swaps | Natural Gas Contract | NYMEX HH - Swaption 2020
Derivative [Line Items]
Weighted Average Fixed Price ($ per bbl) | $ / MMBTU	2.60
Swaps | Natural Gas Contract | CIG - Basis Swaps 2020
Derivative [Line Items]
Weighted Average Differential ($ per bbl) | $ / MMBTU	(0.61)
Swaps | Natural Gas Contract | WAHA - Basis Swaps 2020
Derivative [Line Items]
Weighted Average Differential ($ per bbl) | $ / MMBTU	(1.05)
Swaps | Natural Gas Contract | WAHA - Basis Swaps 2021
Derivative [Line Items]
Weighted Average Differential ($ per bbl) | $ / MMBTU	(0.60)
Collars | Crude Oil Contract | NYMEX WTI - Three-Way Collars 2019
Derivative [Line Items]
Weighted Average Short Put Price ($ per bbl)	49.35
Weighted Average Floor Price ($ per bbl)	59.35
Weighted Average Ceiling Price ($ per bbl)	72.25
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
Collars | Crude Oil Contract | NYMEX WTI - Three-Way Collars 2020
Derivative [Line Items]
Weighted Average Short Put Price ($ per bbl)	48.33
Weighted Average Floor Price ($ per bbl)	57.87
Weighted Average Ceiling Price ($ per bbl)	64.27
Collars | Natural Gas Contract | NYMEX HH - Three-Way Collars 2019
Derivative [Line Items]
Weighted Average Short Put Price ($ per bbl) | $ / MMBTU	2.25
Weighted Average Floor Price ($ per bbl) | $ / MMBTU	2.65
Weighted Average Ceiling Price ($ per bbl) | $ / MMBTU	2.95
Collars | Natural Gas Contract | NYMEX HH - Sold Puts 2020
Derivative [Line Items]
Weighted Average Short Put Price ($ per bbl) | $ / MMBTU	2.15