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Supplemental Gas Data (unaudited) Narrative (Details) Mcf in Millions	12 Months Ended
	Dec. 31, 2019 well Mcf	Dec. 31, 2018 well	Dec. 31, 2017 well
Extractive Industries [Abstract]
Net development wells drilled	75.7	83.9	90.0
Net dry development wells drilled	1.0	0	0
Net exploratory wells drilled	5.0	0	4.0
Net development wells drilled but uncompleted	35.0
Exploratory wells drilled but uncompleted	1.0
Net developmental wells completed, awaiting tie-in to production	7.0
Gas delivery commitment, remaining contractual volume \| Mcf	532.3