Sales of Oil and Natural Gas Properties (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) a
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of property	$ 2,095,000	$ 6,454,000	$ (14,332,000)
Proceeds from sale and exchanges of properties	38,500,000	188,200,000
Loss on sale of oil and natural gas properties	0	0	14,300,000
Proceeds from sales of property, plant and equipment	41,326,000	233,647,000	$ 30,537,000
Gain (Loss) on Disposition of Property Plant Equipment	2,100,000
Oil and natural gas properties sold, gross | a			21,939
Oil and natural gas properties sold | a			7,476
2019 Disposals | Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sales of property, plant and equipment	$ 2,800,000
Certain Surface And Mineral Acreage
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Receivable for proceeds from sale of properties		34,400,000
Gain on sale of property		5,200,000
Pacesetter Physical Assets | Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of property		1,200,000
Proceeds from sales of property, plant and equipment		11,000,000.0
Disposal consideration		13,100,000
Term loan | Pacesetter Physical Assets | Disposed of by sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Financing receivable		$ 2,100,000