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Discontinued Operations and Disposal Groups - Balance Sheet Data Related to Assets and Liabilities Held for Sale (Details) - Held for Sale - 2019 Divestitures $ in Thousands	Sep. 30, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Oil and gas properties (successful efforts method)	$ 6,700
Less: accumulated depreciation, depletion, amortization and impairment	0
Total assets held for sale, net	6,700
Accrued liabilities	6,700
Total liabilities held for sale	$ 6,700

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