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Supplemental Gas Data (unaudited) - Producing Wells, Developed Acreage and Undeveloped Acreage (Details)
well in Thousands, a in Thousands
Dec. 31, 2020
a
well
Extractive Industries [Abstract]  
Working interest percentage 100.00%
Gross(1)  
Proved Developed Acreage | a 351,537
Proved Undeveloped Acreage | a 43,713
Unproved Acreage | a 4,986,196
Total Acreage | a 5,381,446
Net  
Proved Developed Acreage | a 351,537
Proved Undeveloped Acreage | a 43,713
Unproved Acreage | a 3,637,982
Total Acreage | a 4,033,232
Working Interest  
Gross(1)  
Producing Gas Wells | well 4,712
Producing Oil Wells | well 0
Net  
Producing Gas Wells | well 4,401
Producing Oil Wells | well 0
Royalty Interest  
Gross(1)  
Producing Gas Wells | well 1,810
Producing Oil Wells | well 152
Net  
Producing Gas Wells | well 0
Producing Oil Wells | well 0