| Fiscal period | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 |
|---|
| Period End Date | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 | 12/31/2015 | 12/31/2014 | 12/31/2013 | 12/31/2012 | 12/31/2011 |
|---|
| Marketed gas system revenue | -- | -- | -- | -- | -- | -- | 24.90 | 60.04 | 52.81 | 69.90 |
| Oil, gas, and NGL production revenue | 1,126.19 | 1,585.75 | 1,636.36 | 1,253.78 | 1,178.43 | 1,499.91 | 2,481.54 | 2,199.55 | 1,473.87 | 1,332.39 |
| Other operating revenue | 0.39 | 3.49 | 3.80 | 6.62 | 1.95 | 14.03 | 15.22 | 5.81 | 5.44 | 1.06 |
| Realized hedge (loss) gain | -- | -- | -- | -- | -- | -- | -- | -- | -- | (20.71) |
| Gain on divestiture activity | 0.09 | 0.86 | 426.92 | (131.03) | 37.07 | 43.03 | 0.65 | 27.97 | (27.02) | 220.68 |
| Other oil and gas revenue | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Derivative gain | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Total operating revenues and other income | 1,126.67 | 1,590.11 | 2,067.07 | 1,129.38 | 1,217.45 | 1,556.97 | 2,522.31 | 2,293.37 | 1,505.10 | 1,603.32 |
| Oil, gas, and NGL production expense | 391.22 | 500.71 | 487.37 | 507.91 | 597.57 | 723.63 | 715.88 | 597.05 | 391.87 | 290.11 |
| Depletion, depreciation, amortization, and asset retirement obligation liability accretion | 784.99 | 823.80 | 665.31 | 557.04 | 790.75 | 921.01 | 767.53 | 822.87 | 727.88 | 511.10 |
| Impairment of goodwill | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| General and administrative | 99.16 | 132.80 | 116.50 | 117.28 | 124.83 | 157.67 | 167.10 | 149.55 | 119.82 | 118.53 |
| Exploration | 41.00 | 51.50 | 55.17 | 54.71 | 64.97 | 120.57 | 129.86 | 74.10 | 90.25 | 53.54 |
| Other operating expense | (24.83) | (19.89) | (18.33) | (13.67) | (10.77) | (25.01) | (4.66) | (30.08) | (6.99) | (17.57) |
| Marketed gas system expense | -- | -- | -- | -- | -- | -- | (24.46) | (57.65) | (47.58) | (64.25) |
| Unrealized and realized derivative (gain) loss | 161.58 | (97.54) | 161.83 | (26.41) | (250.63) | 408.83 | 583.26 | 3.08 | 55.63 | 37.09 |
| Change in Net Profits Plan liability | -- | -- | -- | -- | -- | -- | 29.85 | 21.84 | 28.90 | 25.48 |
| Bad debt recovery | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Impairment of materials inventory | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Abandonment and impairment of unproved properties | (1,016.01) | (33.84) | (49.89) | (16.08) | (80.37) | (78.64) | (75.64) | (46.11) | (16.34) | (7.37) |
| Impairment of proved properties | -- | -- | -- | -- | (354.61) | (468.68) | (84.48) | (172.64) | (208.92) | (219.04) |
| Minority interest and other | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Impairment of other property and equipment | -- | -- | -- | -- | -- | (49.37) | 0.00 | 0.00 | -- | -- |
| Total Operating Expenses | 2,195.62 | 1,660.07 | 1,230.74 | 1,293.10 | 2,274.49 | 2,135.75 | 1,356.49 | 1,925.12 | 1,525.12 | 1,218.93 |
| Income (loss) from operations | (1,068.95) | (69.97) | 836.34 | (163.72) | (1,057.04) | (578.78) | 1,165.81 | 368.26 | (20.02) | 384.38 |
| Interest expense | 163.89 | 159.10 | 160.91 | 179.26 | 158.69 | 128.15 | 98.55 | 89.71 | 63.72 | 45.85 |
| Interest income | -- | -- | -- | -- | -- | -- | -- | -- | -- | 0.47 |
| Other, net | (3.94) | (1.97) | 3.09 | (0.80) | (1.91) | 0.65 | (2.56) | 0.07 | 0.22 | -- |
| Income (Loss) on extinguishment of debt | 280.08 | -- | (26.74) | (0.04) | 15.72 | (16.58) | -- | -- | -- | -- |
| Income (loss) before income taxes | (956.71) | (231.04) | 651.78 | (343.81) | (1,201.92) | (722.86) | 1,064.70 | 278.61 | (83.52) | 339.00 |
| Income tax (expense) benefit | (192.09) | (44.04) | 143.37 | (182.97) | (444.17) | (275.15) | 398.65 | 107.68 | (29.27) | 123.59 |
| Current portion of income tax (expense) benefit- Federal | 0.00 | (3.83) | 0.00 | 5.70 | 2.93 | -- | -- | -- | -- | (1.76) |
| Current portion of income tax (expense) benefit- State | 0.45 | 1.62 | 1.66 | 3.40 | 1.54 | 1.57 | 0.87 | 2.12 | 0.37 | 1.55 |
| Deferred portion of income tax (expense) benefit | (192.54) | (41.84) | 141.71 | (192.07) | (448.64) | (276.72) | 397.78 | 105.56 | (29.64) | 123.79 |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle, net of income tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Income (Loss) Available to Common Shareholders | (764.61) | (187.00) | 508.41 | (160.84) | (757.74) | (447.71) | 666.05 | 170.94 | (54.25) | 215.42 |
| Income from Continuing Operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative Effect of Change in Accounting Principle, Net of Income Tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Basic net income (loss) per common share | (6.72) | (1.66) | 4.54 | (1.44) | (9.90) | (6.61) | 9.91 | 2.57 | (0.83) | 3.38 |
| Income from Continuing Operations | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative Effect of Change in Accounting Principle, Net of Income Tax | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Diluted net income (loss) per common share | (6.72) | (1.66) | 4.48 | (1.44) | (9.90) | (6.61) | 9.79 | 2.51 | (0.83) | 3.19 |
| Basic weighted-average common shares outstanding | 113.73 | 112.54 | 111.91 | 111.43 | 76.57 | 67.72 | 67.23 | 66.62 | 65.14 | 63.76 |
| Diluted weighted-average common shares outstanding | 113.73 | 112.54 | 113.50 | 111.43 | 76.57 | 67.72 | 68.04 | 68.00 | 65.14 | 67.56 |