Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Disaggregation of Revenue
Revenue	$ 750,474	$ 1,114,668
Revenue from derivatives and other sources	566,631	(77,261)
Total revenue and other	1,317,105	1,037,407
Natural gas sales
Disaggregation of Revenue
Revenue	411,082	657,266
Oil sales
Disaggregation of Revenue
Revenue	35,646	48,052
Gathering and compression
Disaggregation of Revenue
Revenue		3,972
Water handling and treatment
Disaggregation of Revenue
Revenue		507
Marketing
Disaggregation of Revenue
Revenue	46,073	91,186
Other income
Disaggregation of Revenue
Revenue	798	107
Exploration and production | Natural gas sales
Disaggregation of Revenue
Revenue	411,082	657,266
Exploration and production | Natural gas liquids sales (ethane)
Disaggregation of Revenue
Revenue	26,796	35,516
Exploration and production | Natural gas liquids sales (C3+ NGLs)
Disaggregation of Revenue
Revenue	230,877	278,169
Exploration and production | Oil sales
Disaggregation of Revenue
Revenue	35,646	48,052
Marketing | Marketing
Disaggregation of Revenue
Revenue	$ 46,073	$ 91,186