| Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | 
  
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Average  | 
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Instrument  | 
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Daily  | 
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Total  | 
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Weighted  | 
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Weighted  | 
  | 
Weighted  | 
 
Period  | 
      | 
Type  | 
      | 
Volumes  | 
      | 
Volumes  | 
      | 
Strike Price  | 
      | 
Put Price  | 
      | 
Call Price  | 
 
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Crude Oil - WTI (NYMEX)  | 
  | 
(Bbls)(1)  | 
  | 
(Bbls)(1)  | 
  | 
  | 
($/Bbl)(1)  | 
  | 
  | 
($/Bbl)(1)  | 
  | 
  | 
($/Bbl)(1)  | 
 
Jul 2021 - Dec 2021  | 
  | 
swap  | 
  | 
 4,000  | 
  | 
 736,000  | 
  | 
$  | 
 42.06  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Jul 2021 - Dec 2021  | 
  | 
collar  | 
  | 
 200  | 
  | 
 36,800  | 
  | 
$  | 
 —  | 
  | 
$  | 
 40.00  | 
  | 
$  | 
 54.90  | 
 
Jul 2021 - Feb 2022  | 
  | 
collar  | 
  | 
 2,024  | 
  | 
 491,733  | 
  | 
$  | 
 —  | 
  | 
$  | 
 38.81  | 
  | 
$  | 
 57.24  | 
 
Jan 2022 - Feb 2022  | 
   | 
swap  | 
   | 
 3,000  | 
   | 
 177,000  | 
   | 
$  | 
 42.98  | 
   | 
$  | 
 —  | 
   | 
$  | 
 —  | 
 
Mar 2022 - May 2022  | 
   | 
swap  | 
   | 
 2,044  | 
   | 
 188,006  | 
   | 
$  | 
 42.33  | 
   | 
$  | 
 —  | 
   | 
$  | 
 —  | 
 
Mar 2022 - May 2022  | 
  | 
collar  | 
  | 
 2,000  | 
  | 
 184,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 35.00  | 
  | 
$  | 
 48.50  | 
 
Mar 2022 - Sept 2022  | 
  | 
swap  | 
  | 
 1,615  | 
  | 
 345,638  | 
  | 
$  | 
 54.53  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Mar 2022 - Sept 2022  | 
  | 
collar  | 
  | 
 1,615  | 
  | 
 345,638  | 
  | 
$  | 
 —  | 
  | 
$  | 
 45.00  | 
  | 
$  | 
 62.50  | 
 
Oct 2022  | 
  | 
swap  | 
  | 
 2,172  | 
  | 
 67,332  | 
  | 
$  | 
 58.50  | 
  | 
$  | 
 —  | 
  | 
  | 
 —  | 
 
Oct 2022  | 
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collar  | 
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 2,172  | 
  | 
 67,332  | 
  | 
$  | 
 —  | 
  | 
$  | 
 46.00  | 
  | 
  | 
 66.50  | 
 
Nov 2022  | 
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swap  | 
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 2,176  | 
  | 
 65,280  | 
  | 
$  | 
 58.25  | 
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$  | 
 —  | 
  | 
  | 
 —  | 
 
Nov 2022  | 
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collar  | 
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 2,176  | 
  | 
 65,280  | 
  | 
$  | 
 —  | 
  | 
$  | 
 46.00  | 
  | 
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 66.30  | 
 
  | 
  | 
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  | 
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  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
  | 
 
Natural Gas - Henry Hub (NYMEX)  | 
  | 
(MMbtu)(2)  | 
  | 
(MMbtu)(2)  | 
  | 
  | 
($/MMbtu)(2)  | 
  | 
  | 
($/MMbtu)(2)  | 
  | 
  | 
($/MMbtu)(2)  | 
 
Jul 2021 - Dec 2021  | 
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collar  | 
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 30,000  | 
  | 
 5,520,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 2.18  | 
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$  | 
 3.00  | 
 
Jul 2021 - Dec 2021  | 
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swap  | 
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 10,000  | 
  | 
 1,840,000  | 
  | 
$  | 
 2.62  | 
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$  | 
 —  | 
  | 
$  | 
 —  | 
 
Jul 2021 - Dec 2021  | 
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call  | 
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 40,000  | 
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 7,360,000  | 
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$  | 
 —  | 
  | 
$  | 
 —  | 
  | 
$  | 
 3.50  | 
 
Jul 2021 - Dec 2022  | 
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collar  | 
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 40,000  | 
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 21,960,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 1.83  | 
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$  | 
 3.00  | 
 
Jul 2021 - Dec 2022  | 
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call  | 
  | 
 40,000  | 
  | 
 21,960,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
  | 
$  | 
 3.00  | 
 
Jan 2022 - Feb 2022  | 
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collar  | 
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 30,000  | 
  | 
 1,830,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 2.20  | 
  | 
$  | 
 4.50  | 
 
Jan 2022 - Dec 2022  | 
  | 
call  | 
  | 
 37,000  | 
  | 
 13,505,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
  | 
$  | 
 3.50  | 
 
Jan 2022  | 
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swap  | 
  | 
 20,000  | 
  | 
 620,000  | 
  | 
$  | 
 2.79  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Feb 2022  | 
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swap  | 
  | 
 30,000  | 
  | 
 840,000  | 
  | 
$  | 
 2.79  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Mar 2022 - May 2022  | 
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collar  | 
  | 
 10,000  | 
  | 
 920,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 2.25  | 
  | 
$  | 
 3.40  | 
 
Mar 2022 - May 2022  | 
  | 
swap  | 
  | 
 10,544  | 
  | 
 970,075  | 
  | 
$  | 
 2.69  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Apr 2022 - Sept 2022  | 
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swap  | 
  | 
 12,428  | 
  | 
 2,274,311  | 
  | 
$  | 
 2.44  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Oct 2022  | 
   | 
swap  | 
   | 
 16,129  | 
   | 
 499,999  | 
   | 
$  | 
 2.56  | 
   | 
$  | 
 —  | 
   | 
$  | 
 —  | 
 
Nov 2022  | 
  | 
swap  | 
  | 
 17,570  | 
  | 
 527,100  | 
  | 
$  | 
 2.63  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Jan 2023 - Dec 2023  | 
  | 
call  | 
  | 
 70,000  | 
  | 
 25,550,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
  | 
$  | 
 3.50  | 
 
Jul 2021 - Mar 2025 (3)  | 
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swap  | 
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 72,920  | 
  | 
 99,900,000  | 
  | 
$  | 
 2.63  | 
  | 
$  | 
 —  | 
  | 
$  | 
 —  | 
 
Apr 2025 - Apr 2028 (3)  | 
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put  | 
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 55,684  | 
  | 
 62,700,000  | 
  | 
$  | 
 —  | 
  | 
$  | 
 2.35  | 
  | 
$  | 
 —  | 
 
 
(2)    MMbtu = Million British Thermal Units 
(3)    These contracts were entered into by the Company’s wholly owned subsidiary, A-I LLC, in conjunction with the Mobile Bay Transaction (see Note 4 Mobile Bay Transaction). 
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| Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] | 
  
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June 30,   | 
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December 31,   | 
 
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      | 
2021  | 
      | 
2020  | 
 
Prepaid expenses and other current assets  | 
  | 
$  | 
 14,021  | 
  | 
$  | 
 2,752  | 
 
Other assets (long-term)  | 
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   | 
 21,005  | 
  | 
   | 
 2,762  | 
 
Accrued liabilities  | 
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   | 
 82,832  | 
  | 
   | 
 13,620  | 
 
Other liabilities (long-term)  | 
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 28,122  | 
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 4,384  | 
 
 
 
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Three Months Ended June 30,   | 
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Six Months Ended June 30,   | 
 
  | 
      | 
2021  | 
      | 
2020  | 
      | 
2021  | 
      | 
2020  | 
 
Realized loss (gain)  | 
  | 
$  | 
 15,357  | 
  | 
$  | 
 (22,578)  | 
  | 
$  | 
 23,602  | 
  | 
$  | 
 (31,970)  | 
 
Unrealized loss (gain)  | 
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 66,083  | 
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 37,992  | 
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 82,418  | 
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 (14,528)  | 
 
Derivative loss (gain)  | 
  | 
$  | 
 81,440  | 
  | 
$  | 
 15,414  | 
  | 
$  | 
 106,020  | 
  | 
$  | 
 (46,498)  | 
 
 
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