| **SUPPLEMENTAL INFORMATION - QUARTERLY FINANCIAL INFORMATION QUARTERLY FINANCIAL INFORMATION (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands** | 3 Months Ended | 12 Months Ended |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|----------------|-----------------|
||
| **Revenues:**                                                                                                                                                               |           |            |   |   |   |   |   |   |   |   |   |
| Natural gas, NGL and crude oil sales                                                                                                                                        | $ 103,193      | $ 104,483       | $ 96,928 | $ 74,109 | $ 99,857 | $ 120,526 | $ 131,017 | $ 120,013 | $ 378,713 | $ 471,413 | $ 340,795 |
| Sales from natural gas marketing                                                                                                                                            | 2,584          | 2,580           | 2,523 | 3,233 | 8,922 | 13,297 | 22,415 | 26,937 | 10,920 | 71,571 | 69,787 |
| Commodity price risk management gain (loss), net                                                                                                                            | 62,013         | 123,549         | (49,041) | 66,662 | 297,643 | 90,213 | (52,643) | (24,909) | 203,183 | 310,304 | (23,919) |
| Well operations, pipeline income and other                                                                                                                                  | 844            | 488             | 550 | 628 | 1,269 | 520 | 514 | 616 | 2,510 | 2,919 | 6,002 |
| Total revenues                                                                                                                                                              | 168,634        | 231,100         | 50,960 | 144,632 | 407,691 | 224,556 | 101,303 | 122,657 | 595,326 | 856,207 | 392,665 |
| **Costs, expenses and other:**                                                                                                                                              |           |            |   |   |   |   |   |   |   |   |   |
| Lease operating expenses                                                                                                                                                    | 14,244         | 13,824          | 12,639 | 16,285 | 11,050 | 11,020 | 11,961 | 8,371 | 56,992 | 42,402 | 33,817 |
| Production taxes                                                                                                                                                            | 5,237          | 5,476           | 3,837 | 3,893 | 2,950 | 8,724 | 7,551 | 6,390 | 18,443 | 25,615 | 21,758 |
| Transportation, gathering and processing expenses                                                                                                                           | 3,567          | 3,938           | 1,308 | 1,338 | 1,331 | 1,208 | 818 | 1,235 | 10,151 | 4,592 | 5,152 |
| Cost of natural gas marketing                                                                                                                                               | 2,842          | 2,781           | 2,836 | 3,258 | 9,370 | 13,347 | 22,428 | 26,870 | 11,717 | 72,015 | 70,084 |
| Exploration expense                                                                                                                                                         | 290            | 252             | 275 | 285 | 174 | 190 | 276 | 307 | 1,102 | 947 | 6,334 |
| Impairment of natural gas and crude oil properties                                                                                                                          | 413            | 154,031         | 4,404 | 2,772 | 161,914 | 1,962 | 2,019 | 952 | 161,620 | 166,847 | 52,873 |
| General and administrative expense                                                                                                                                          | 27,908         | 20,278          | 20,728 | 21,045 | 20,989 | 36,328 | 41,713 | 24,529 | 89,959 | 123,559 | 63,715 |
| Depreciation, depletion and amortization                                                                                                                                    | 96,385         | 80,947          | 70,106 | 55,820 | 50,363 | 49,640 | 49,636 | 42,889 | 303,258 | 192,528 | 115,624 |
| Accretion of asset retirement obligations                                                                                                                                   | 1,551          | 1,594           | 1,588 | 1,560 | 873 | 861 | 840 | 841 | 6,293 | 3,415 | 4,566 |
| (Gain) loss on sale of Leaseholds                                                                                                                                           | (83)           | (74)            | (207) | (21) | (70) | 21 | (23) | 579 | (385) | 507 | 2,022 |
| Total cost, expenses and other                                                                                                                                              | 152,354        | 283,047         | 117,514 | 106,235 | 258,944 | 123,301 | 137,219 | 112,963 | 659,150 | 632,427 | 375,945 |
| Income from operations                                                                                                                                                      | 16,280         | (51,947)        | (66,554) | 38,397 | 148,747 | 101,255 | (35,916) | 9,694 | (63,824) | 223,780 | 16,720 |
| Interest expense                                                                                                                                                            | (12,187)       | (12,092)        | (11,567) | (11,725) | (11,643) | (11,821) | (12,195) | (12,183) | (47,571) | (47,842) | (50,143) |
| Interest income                                                                                                                                                             | 1,181          | 1,378           | 1,135 | 1,113 | 981 | 39 | 83 | 187 | 4,807 | 1,290 | 460 |
| Income (loss) from continuing operations before income taxes                                                                                                                | 5,274          | (62,661)        | (76,986) | 27,785 | 138,085 | 89,473 | (48,028) | (2,302) | (106,588) | 177,228 | (32,963) |
| Provision for income taxes                                                                                                                                                  | (2,252)        | 21,167          | 30,116 | (10,723) | (54,115) | (35,396) | 18,650 | 894 | 38,308 | (69,967) | 11,852 |
| Income (loss) from continuing operations                                                                                                                                    | 3,022          | (41,494)        | (46,870) | 17,062 | 83,970 | 54,077 | (29,378) | (1,408) | (68,280) | 107,261 | (21,111) |
| Income (loss) from discontinued operations, net of tax                                                                                                                      | 0              | 0               | 0 | 0 | 47,782 | (80) | 1,191 | (719) | 0 | 48,174 | (1,190) |
| Net income (loss)                                                                                                                                                           | $ 3,022        | $ (41,494)      | $ (46,870) | $ 17,062 | $ 131,752 | $ 53,997 | $ (28,187) | $ (2,127) | $ (68,280) | $ 155,435 | $ (22,301) |
| **Basic**                                                                                                                                                                   |           |            |   |   |   |   |   |   |   |   |   |
| Income (loss) from continuing operations                                                                                                                                    | $ 0.08         | $ (1.04)        | $ (1.17) | $ 0.47 | $ 2.34 | $ 1.51 | $ (0.82) | $ (0.04) | $ (1.74) | $ 3.00 | $ (0.65) |
| Income (loss) from discontinued operations                                                                                                                                  | 0.00           | 0.00            | 0.00 | 0.00 | 1.33 | 0.00 | 0.03 | (0.02) | 0.00 | 1.34 | (0.04) |
| Net income (loss) attributable to shareholders                                                                                                                              | 0.08           | (1.04)          | (1.17) | 0.47 | 3.67 | 1.51 | (0.79) | (0.06) | (1.74) | 4.34 | (0.69) |
| **Diluted**                                                                                                                                                                 |           |            |   |   |   |   |   |   |   |   |   |
| Income (loss) from continuing operations                                                                                                                                    | 0.07           | (1.04)          | (1.17) | 0.46 | 2.32 | 1.47 | (0.82) | (0.04) | (1.74) | 2.93 | (0.65) |
| Income (loss) from discontinued operations                                                                                                                                  | 0.00           | 0.00            | 0.00 | 0.00 | 1.32 | 0.00 | 0.03 | (0.02) | 0.00 | 1.31 | (0.04) |
| Net income (loss) attributable to shareholders                                                                                                                              | $ 0.07         | $ (1.04)        | $ (1.17) | $ 0.46 | $ 3.64 | $ 1.47 | $ (0.79) | $ (0.06) | $ (1.74) | $ 4.24 | $ (0.69) |
| **Weighted-average common shares outstanding**                                                                                                                              |           |            |   |   |   |   |   |   |   |   |   |
| Basic                                                                                                                                                                       | 40,094         | 40,085          | 40,035 | 36,349 | 35,847 | 35,834 | 35,762 | 35,690 | 39,153 | 35,784 | 32,426 |
| Diluted                                                                                                                                                                     | 41,264         | 40,085          | 40,035 | 36,981 | 36,146 | 36,828 | 35,762 | 35,690 | 39,153 | 36,678 | 32,426 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of accretion expense, from continuing operations, recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.
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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets or depleting assets to period that benefits from use of the assets in continuing operations.
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Gain (loss) recorded from sale of oil and gas properties, includes the realized gains (losses) on the sale of proved and unproved oil and gas properties, from continuing operations.
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| - Definition
Cost of oil and gas purchased during the reporting period.
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Total costs of sales and operating expenses for the period.
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Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.
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| - Definition
The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.
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| - Definition
The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Exploration expenses (including prospecting) related to oil and gas producing entities and would be included in operating expenses of that entity. Costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing oil and gas reserves, including costs of drilling exploratory wells and exploratory-type stratigraphic test wells. Exploration costs may be incurred both before acquiring the related property (sometimes referred to in part as prospecting costs) and after acquiring the property. Principal types of exploration costs, which include depreciation and applicable operating costs of support equipment and facilities and other costs of exploration activities, are: (i) Costs of topographical, geographical and geophysical studies, rights of access to properties to conduct those studies, and salaries and other expenses of geologists, geophysical crews, and others conducting those studies. Collectively, these are sometimes referred to as geological and geophysical or "G&G" costs. (ii) Costs of carrying and retaining undeveloped properties, such as delay rentals, ad valorem taxes on properties, legal costs for title defense, and the maintenance of land and lease records. (iii) Dry hole contributions and bottom hole contributions. (iv) Costs of drilling and equipping exploratory wells. (v) Costs of drilling exploratory-type stratigraphic test wells.
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| - Definition
Cost incurred related to the gas activities, such as transportation, marketing and processing crude oil, natural gas and refined petroleum products.
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| - Definition
The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.
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| - Definition
Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.
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| - Definition
This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.
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| - Definition
The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period.
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The amount of net income (loss) derived from continuing operations during the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.
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| - Definition
Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.
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| - Definition
Per basic share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.
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Per diluted share amount, after tax, of income (loss) from the day-to-day business activities of the discontinued operation and gain (loss) from the disposal of the discontinued operation.
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.
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| - Definition
Amount of the cost of borrowed funds accounted for as interest expense.
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Amount of interest income earned from interest bearing assets not separately disclosed.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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Revenue from the sale of oil and gas during the period.
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The net result for the period of deducting operating expenses from operating revenues.
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The total amount of other operating income, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operation.
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| - Definition
A tax assessed on oil and gas production.
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Costs related to the impairment of oil and gas properties.
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Production (lifting) costs from oil and gas producing activities, including but not limited to lease operating expense, production and ad valorem taxes, and transportation expense.
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| - Definition
Revenue from sale of oil and gas purchased from other sources.
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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).
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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
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