Derivative Instruments - Schedule of Outstanding Commodity Derivative Instruments (Details) $ in Thousands	1 Months Ended		4 Months Ended	9 Months Ended
	Nov. 04, 2020 MMBTU $ / bbl bbl	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) counterparty $ / bbl	Sep. 30, 2020 USD ($) counterparty $ / bbl bbl	Sep. 30, 2019 USD ($)
Derivative [Line Items]
Proceeds from liquidation of derivative instruments | $				$ 224,223	$ 10,752
Number of counterparties | counterparty			1	1
Fair value assets (liabilities) | $			$ 200	$ 200
Minimum Hedge Volume Commitment, First Year | Subsequent Event | Minimum
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	10,303,000
Minimum target price (in usd per bbl)	43.04
Minimum Hedge Volume Commitment, Second Year | Subsequent Event | Minimum
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	6,761,000
Minimum target price (in usd per bbl)	43.94
Minimum Hedge Volume Commitment, Third Year | Subsequent Event
Derivative [Line Items]
Percentage of required volumes entered into (percent)	97.00%
Target prices entered into (percent)	97.00%
Minimum Hedge Volume Commitment, Third Year | Subsequent Event | Minimum
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	4,945,000
Minimum target price (in usd per bbl)	44.79
Crude Oil | Three-way costless collar contracts
Derivative [Line Items]
Proceeds from liquidation of derivative instruments | $		$ 25,300	$ 37,400
NYMEX WTI | Crude Oil | 2020 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl				182,000
Weighted average swap price (in dollars per barrel)			41.17	41.17
Fair value assets (liabilities) | $			$ 183	$ 183
NYMEX WTI | Crude Oil | 2020 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	182,000
Weighted average swap price (in dollars per barrel)	41.17
NYMEX WTI | Crude Oil | 2021 Fixed price swaps
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl				62,000
Weighted average swap price (in dollars per barrel)			41.17	41.17
Fair value assets (liabilities) | $			$ 17	$ 17
NYMEX WTI | Crude Oil | 2021 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	9,414,000
Weighted average swap price (in dollars per barrel)	42.07
NYMEX WTI | Crude Oil | 2022 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	6,880,000
Weighted average swap price (in dollars per barrel)	42.64
NYMEX WTI | Crude Oil | 2023 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	4,566,000
Weighted average swap price (in dollars per barrel)	43.61
NYMEX WTI | Crude Oil | 2024 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of oil (in Bbls) | bbl	372,000
Weighted average swap price (in dollars per barrel)	43.74
NYMEX HH | Natural Gas | 2020 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU	1,240,000
Weighted average swap price (in dollars per barrel)	2.84
NYMEX HH | Natural Gas | 2021 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU	14,600,000
Weighted average swap price (in dollars per barrel)	2.84
NYMEX HH | Natural Gas | 2022 Fixed price swaps | Subsequent Event
Derivative [Line Items]
Total notional amount of natural gas (in MMBtu) | MMBTU	5,430,000
Weighted average swap price (in dollars per barrel)	2.82