Derivatives and Financial Instruments - Summary of Open Derivative Contracts for Oil and Natural Gas (Details) - Not Designated as Hedging Instrument - Swap Contracts - Swap bbl in Thousands, MMBTU in Thousands	2 Months Ended	12 Months Ended
	Feb. 27, 2018 $ / bbl bbl	Dec. 31, 2017 MMBTU $ / MMBTU $ / bbl bbl
Oil | Q1 2018
Derivative [Line Items]
Derivative Contract, Volume | bbl		729
Derivative Contract, Weighted Average Price		54.36
Derivative Contract, Price Range Low		52.09
Derivative Contract, Price Range High		57.15
Oil | Q2 2018
Derivative [Line Items]
Derivative Contract, Volume | bbl		736
Derivative Contract, Weighted Average Price		54.33
Derivative Contract, Price Range Low		52.09
Derivative Contract, Price Range High		56.75
Oil | Q3 2018
Derivative [Line Items]
Derivative Contract, Volume | bbl		744
Derivative Contract, Weighted Average Price		54.35
Derivative Contract, Price Range Low		51.85
Derivative Contract, Price Range High		55.87
Oil | Q4 2018
Derivative [Line Items]
Derivative Contract, Volume | bbl		749
Derivative Contract, Weighted Average Price		54.24
Derivative Contract, Price Range Low		51.85
Derivative Contract, Price Range High		55.87
Oil | Q1 2019
Derivative [Line Items]
Derivative Contract, Volume | bbl		165
Derivative Contract, Weighted Average Price		53.58
Derivative Contract, Price Range Low		52.82
Derivative Contract, Price Range High		54.02
Oil | Q2 2019
Derivative [Line Items]
Derivative Contract, Volume | bbl		165
Derivative Contract, Weighted Average Price		53.58
Derivative Contract, Price Range Low		52.82
Derivative Contract, Price Range High		54.02
Oil | Q3 2019
Derivative [Line Items]
Derivative Contract, Volume | bbl		165
Derivative Contract, Weighted Average Price		53.58
Derivative Contract, Price Range Low		52.82
Derivative Contract, Price Range High		54.02
Oil | Q4 2019
Derivative [Line Items]
Derivative Contract, Volume | bbl		165
Derivative Contract, Weighted Average Price		53.58
Derivative Contract, Price Range Low		52.82
Derivative Contract, Price Range High		54.02
Natural Gas | Q1 2018
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		13,590
Derivative Contract, Weighted Average Price | $ / MMBTU		3.06
Derivative Contract, Price Range Low | $ / MMBTU		2.96
Derivative Contract, Price Range High | $ / MMBTU		3.45
Natural Gas | Q2 2018
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		13,660
Derivative Contract, Weighted Average Price | $ / MMBTU		3.02
Derivative Contract, Price Range Low | $ / MMBTU		2.86
Derivative Contract, Price Range High | $ / MMBTU		3.23
Natural Gas | Q3 2018
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		13,600
Derivative Contract, Weighted Average Price | $ / MMBTU		3.01
Derivative Contract, Price Range Low | $ / MMBTU		2.90
Derivative Contract, Price Range High | $ / MMBTU		3.23
Natural Gas | Q4 2018
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		13,630
Derivative Contract, Weighted Average Price | $ / MMBTU		3.01
Derivative Contract, Price Range Low | $ / MMBTU		2.90
Derivative Contract, Price Range High | $ / MMBTU		3.23
Natural Gas | Q1 2019
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		3,600
Derivative Contract, Weighted Average Price | $ / MMBTU		2.91
Derivative Contract, Price Range Low | $ / MMBTU		2.90
Derivative Contract, Price Range High | $ / MMBTU		2.93
Natural Gas | Q2 2019
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		3,600
Derivative Contract, Weighted Average Price | $ / MMBTU		2.91
Derivative Contract, Price Range Low | $ / MMBTU		2.90
Derivative Contract, Price Range High | $ / MMBTU		2.93
Natural Gas | Q3 2019
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		3,600
Derivative Contract, Weighted Average Price | $ / MMBTU		2.91
Derivative Contract, Price Range Low | $ / MMBTU		2.90
Derivative Contract, Price Range High | $ / MMBTU		2.93
Natural Gas | Q4 2019
Derivative [Line Items]
Derivative Contract, Volume | MMBTU		3,600
Derivative Contract, Weighted Average Price | $ / MMBTU		2.91
Derivative Contract, Price Range Low | $ / MMBTU		2.90
Derivative Contract, Price Range High | $ / MMBTU		2.93
Subsequent Event | Oil | February 2018 Through December 2018
Derivative [Line Items]
Derivative Contract, Volume | bbl	35
Derivative Contract, Weighted Average Price	61.85
Subsequent Event | Oil | FY 2019
Derivative [Line Items]
Derivative Contract, Volume | bbl	60
Derivative Contract, Weighted Average Price	57.58