Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue
Revenue	$ 652,219	$ 969,477	$ 1,402,693	$ 2,084,145
Revenue from derivatives and other sources	(167,308)	330,187	399,323	252,926
Total revenue	484,911	1,299,664	1,802,016	2,337,071
Natural gas sales
Disaggregation of Revenue
Revenue	367,415	553,372	778,497	1,210,638
Oil sales
Disaggregation of Revenue
Revenue	8,322	49,062	43,968	97,114
Gathering and compression
Disaggregation of Revenue
Revenue				3,972
Water handling and treatment
Disaggregation of Revenue
Revenue				507
Marketing
Disaggregation of Revenue
Revenue	64,285	63,080	110,358	154,266
Other income
Disaggregation of Revenue
Revenue	707	1,760	1,505	1,867
Exploration and production | Natural gas sales
Disaggregation of Revenue
Revenue	367,415	553,372	778,497	1,210,638
Exploration and production | Natural gas liquids sales (ethane)
Disaggregation of Revenue
Revenue	26,644	30,374	53,440	65,890
Exploration and production | Natural gas liquids sales (C3+ NGLs)
Disaggregation of Revenue
Revenue	185,553	273,589	416,430	551,758
Exploration and production | Oil sales
Disaggregation of Revenue
Revenue	8,322	49,062	43,968	97,114
Marketing | Marketing
Disaggregation of Revenue
Revenue	$ 64,285	$ 63,080	$ 110,358	$ 154,266