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Supplemental Information on Oil and Natural Gas Producing Activities (Unaudited) - Results of Operations from Oil and Natural Gas Producing Activities (Unaudited) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Results of Operations for Oil and Gas Producing Activities
Revenues	$ 266,845	$ 349,395	$ 357,299
Expenses
Production costs	110,711	112,173	116,372
Depreciation and depletion	146,874	127,281	118,035
Impairment	409,574	0	0
Total expenses	667,159	239,454	234,407
Income (loss) before income taxes	(401,055)	109,272	121,803
Income tax expense (benefit)	(105,477)	28,520	47,722
Results of operations for oil and natural gas producing activities (excluding corporate overhead and interest costs)	(295,578)	80,752	74,081
Oil, natural gas and NGL
Results of Operations for Oil and Gas Producing Activities
Revenues	$ 266,104	$ 348,726	$ 356,210

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Costs related to the impairment of oil and gas properties.

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