| **ASSETS HELD FOR SALE, DIVESTITURES AND DISCONTINUED OPERATIONS Discontinued Operations and Disposal Groups (Details) - USD ($) $ in Thousands** | 12 Months Ended |
|---------------------------------------------------------------------------------------------------------------------------------------------------|-----------------|
||
| **Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]**                                                     |            |   |   |
| Lease operating expenses                                                                                                                          | $ 59,950        | $ 56,992 | $ 42,402 |
| Production taxes                                                                                                                                  | 31,410          | 18,443 | 25,615 |
| Transportation, gathering and processing expenses                                                                                                 | 18,415          | 10,151 | 4,592 |
| Impairment of Natural Gas and Crude Oil Properties                                                                                                | 0               | 0 | 433 |
| Income (loss) from discontinued operations, net of tax                                                                                            | 0               | 0 | 48,174 |
| **Supplemental Cash Flows Information**                                                                                                           |            |   |   |
| Capital expenditures                                                                                                                              | (436,884)       | (599,546) | (623,750) |
| Change in accounts payable related to purchases of properties and equipment                                                                       | $ (40,448)      | $ (45,230) | 39,667 |
| Net Assets Related to Discontinued Operations [Member]                                                                                            |            |   |   |
| **Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]**                                                     |            |   |   |
| Natural gas, NGL and crude oil sales                                                                                                              |            |   | 24,149 |
| Commodity price risk management gain (loss), net                                                                                                  |            |   | (1,085) |
| Well operations, pipeline income and other                                                                                                        |            |   | 48 |
| Disposal Group, Discontinued Operations, Total revenue                                                                                            |            |   | 23,112 |
| Lease operating expenses                                                                                                                          |            |   | 1,280 |
| Production taxes                                                                                                                                  |            |   | 1,579 |
| Transportation, gathering and processing expenses                                                                                                 |            |   | 3,536 |
| Impairment of Natural Gas and Crude Oil Properties                                                                                                |            |   | 433 |
| Depreciation, depletion and amortization                                                                                                          |            |   | 9,128 |
| Accretion of ARO and other, Discontinued Operations                                                                                               |            |   | 4,170 |
| (Gain) loss on sale of properties and equipment                                                                                                   |            |   | (76,479) |
| Total costs, expenses and other                                                                                                                   |            |   | (56,353) |
| Disposal Group, Including Discontinued Operation, Interest Expense                                                                                |            |   | (2,222) |
| Disposal Group, Including Discontinued Operation, Interest Income                                                                                 |            |   | 194 |
| Income (loss) from discontinued operations                                                                                                        |            |   | 77,437 |
| Income taxes (expense) benefit                                                                                                                    |            |   | (29,263) |
| Income (loss) from discontinued operations, net of tax                                                                                            |            |   | 48,174 |
| PDCM Divestiture [Member]                                                                                                                         |            |   |   |
| **Supplemental Cash Flows Information**                                                                                                           |            |   |   |
| Capital expenditures                                                                                                                              |            |   | (17,253) |
| Change in accounts payable related to purchases of properties and equipment                                                                       |            |   | $ (5,727) |

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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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Accretion of ARO and other, Discontinued Operations
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Costs related to the impairment of discontinued crude oil and gas properties.
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Disposal Group, Discontinued Operations, Total revenue
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Amount of total operating expenses attributable to the disposal group during the reporting period.
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| - Definition
The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to discontinued operations.
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| - Definition
The total amount of other operating income classified as discontinued operations, 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
Future cash outflow to pay for purchases of fixed assets that have occurred.
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| - Definition
Amount of deprecation and amortization expense attributable to property, plant and equipment and intangible assets of discontinued operations.
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| - Definition
Amount before tax of gain (loss) not previously recognized resulting from the disposal of a discontinued operation.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount before tax of income (loss) from a discontinued operation. 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
Amount of interest expense attributable to disposal group, including, but not limited to, discontinued operation.
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Amount of interest income attributable to disposal group, including, but not limited to, discontinued operation.
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Amount of other income attributable to disposal group, including, but not limited to, discontinued operation.
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Amount of revenue attributable to disposal group, including, but not limited to, discontinued operation.
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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
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
The cash outflow for exploration and development of oil and gas properties. It includes cash payments related to development of oil and gas wells drilled at previously untested geologic structures (to determine the presence of oil or gas) and wells drilled at sites where the presence of oil or gas has already been established (to extract the oil or gas).
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| - Definition
A tax assessed on oil and gas production.
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| - Definition
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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