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Supplemental Gas Data (unaudited) - Costs Incurred for Property Acquisition, Exploration and Development (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property Acquisitions:
Proved Properties	$ 16,622	$ 36,710	$ 38,621
Unproved Properties	8,060	24,760	36,248
Development**	432,438	1,063,945	986,419
Exploration	33,644	79,855	61,604
Total	490,764	1,205,270	1,122,892
Midstream
Property Acquisitions:
Development**	$ 67,000	$ 325,000	$ 142,000

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have proved reserves.

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Costs incurred, including capitalized costs and costs charged to expense, associated with the acquisition of oil and gas properties that have unproved reserves.

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Development costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Exploration costs incurred, including capitalized costs and costs charged to expense, in oil and gas activities.

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Amount of costs incurred related to oil and gas property acquisition, exploration and development activities, including capitalized costs and costs charged to expense.

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