| **SUPPLEMENTAL INFORMATION - NATURAL GAS AND CRUDE OIL PROPERTIES Supplemental Information on Natural Gas and Crude Oil Exploration, Development and Production Activities (Tables)** | 12 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| **Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities [Abstract]**                                                                     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                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| Schedule of Prices Used to Estimate Natural Gas and Crude Oil Reserves [Table Text Block]                                                                                             | used to estimate our reserves, by commodity, are presented below.  Price Used to Estimate Reserves*As of December 31, Crude Oil(per Bbl) Natural Gas(per Mcf) NGLs(per Bbl)       2015 $42.10 $2.05 $12.232014 84.65 3.92 32.272013 82.18 3.22 29.92                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        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| Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table Text Block]                                                                                        | The following tables present the changes in our estimated quantities of proved reserves: Crude Oil, Condensate (MBbls) Natural Gas(MMcf) NGLs (MBbls) Total(MBoe)Proved Reserves:       Proved reserves, January 1, 2013 (1)59,310 604,038 32,827 192,810Revisions of previous estimates(18,420) (117,068) (8,549) (46,480)Extensions, discoveries and other additions, including infill reserves in an existing proved field55,759 365,563 25,249 141,935Purchases of reserves343 2,894 217 1,043Dispositions(252) (94,927) (30) (16,104)Production(2,910) (20,860) (1,043) (7,430)Proved reserves, December 31, 2013 (2)93,830 739,640 48,671 265,774Revisions of previous estimates(29,777) (149,064) (10,204) (64,825)Extensions, discoveries and other additions, including infill reserves in an existing proved field40,792 202,957 23,411 98,029Purchases of reserves5 43 5 17Dispositions(13) (237,306) (8) (39,572)Production(4,322) (19,298) (1,756) (9,294)Proved reserves, December 31, 2014100,515 536,972 60,119 250,129Revisions of previous estimates(43,268) (154,775) (24,407) (93,471)Extensions, discoveries and other additions, including infill reserves in an existing proved field48,707 311,709 30,835 131,494Purchases of reserves17 215 23 76Dispositions(12) (82) (8) (34)Production(6,984) (33,302) (2,835) (15,369)Proved reserves, December 31, 201598,975 660,737 63,727 272,825        Proved Developed Reserves, as of:       January 1, 2013 (1)20,412 281,925 14,353 81,753December 31, 2013 (2)23,997 220,387 14,825 75,553December 31, 201426,798 186,633 17,002 74,905December 31, 201526,257 175,367 15,011 70,496Proved Undeveloped Reserves, as of:      January 1, 2013 (1)38,898 322,113 18,474 111,058December 31, 2013 (2)69,833 519,253 33,846 190,221December 31, 201473,717 350,339 43,117 175,224December 31, 201572,718 485,370 48,716 202,329        __________(1)Includes estimated reserve data related to our Piceance and NECO assets, which were divested in June 2013. See Note 15, Assets Held for Sale, Divestitures and Discontinued Operations, for additional details related to the divestiture of our Piceance and NECO assets. Total proved reserves include 148 MBbls of crude oil and 83,656 MMcf of natural gas, for an aggregate of 14,091 MBoe of crude oil equivalent related to our Piceance and NECO assets. There were no proved undeveloped reserves attributable to the Piceance and NECO assets as of December 31, 2012.(2)Includes estimated reserve data related to our Marcellus Shale assets, which were divested in October 2014. See Note 15, Assets Held for Sale, Divestitures and Discontinued Operations, for additional details related to the divestiture of our Marcellus Shale assets. Total proved reserves included 235,950 MMcf of natural gas, for an aggregate of 39,325 Mboe of crude oil equivalent, related to our Marcellus Shale assets. Total proved developed reserves related to those assets included 53,904 MMcf and 8,984 MBoe, respectively, and proved undeveloped reserves included 182,046 MMcf and 30,341 MBoe, respectively. Developed Undeveloped Total (MBoe)      Beginning proved reserves, January 1, 201381,753 111,057 192,810Production(7,430) — (7,430)Undeveloped reserves converted to developed3,212 (3,212) —Purchases of reserves1,043 — 1,043Dispositions(16,104) — (16,104)Extensions, discoveries and other additions, including infill reserves in an existing proved field19,830 122,105 141,935Revisions of previous estimates(6,751) (39,729) (46,480)Ending proved reserves, December 31, 201375,553 190,221 265,774Production(9,294) — (9,294)Undeveloped reserves converted to developed12,730 (12,730) —Purchases of reserves17 — 17Dispositions(9,231) (30,341) (39,572)Extensions, discoveries and other additions, including infill reserves in an existing proved field27,957 70,072 98,029Revisions of previous estimates(22,827) (41,998) (64,825)Ending proved reserves, December 31, 201474,905 175,224 250,129Production(15,369) — (15,369)Undeveloped reserves converted to developed29,090 (29,090) —Purchases of reserves76 — 76Dispositions(34) — (34)Extensions, discoveries and other additions, including infill reserves in an existing proved field8,703 122,791 131,494Revisions of previous estimates(26,875) (66,596) (93,471)Ending proved reserves, December 31, 201570,496 202,329 272,825       |
| Results of Operations for Oil and Gas Producing Activities Disclosure [Table Text Block]                                                                                              | The results of operations for crude oil and natural gas producing activities are presented below. The results include activities related to both continuing and discontinued operations and exclude activities related to natural gas marketing and well operations and pipeline services.Year Ended December 31,2015 2014 2013(in thousands)Revenue:  Crude oil, natural gas and NGLs sales$378,713 $495,562 $379,796Commodity price risk management gain (loss), net203,183 309,219 (23,905)581,896 804,781 355,891Expenses:     Lease operating expenses56,992 43,682 40,339Production taxes18,443 27,194 25,474Transportation, gathering and processing expenses10,151 8,128 10,435Exploration expense1,102 948 7,071Impairment of proved crude oil and natural gas properties161,620 167,280 53,827Depreciation, depletion, and amortization298,760 201,656 124,202Accretion of asset retirement obligations6,293 3,455 4,747(Gain) loss on sale of  properties and equipment(385) (75,972) 3,722552,976 376,371 269,817Results of operations for crude oil and natural gas producingactivities before provision for income taxes28,920 428,410 86,074     Provision for income taxes(10,394) (166,930) (31,109)  Results of operations for crude oil and natural gas producing activities, excluding corporate overhead and interest costs$18,526 $261,480 $54,965                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |
| Cost Incurred in Oil and Gas Property Acquisition, Exploration, and Development Activities Disclosure [Table Text Block]                                                              | Costs incurred in crude oil and natural gas property acquisition, exploration and development are presented below. Year Ended December 31, 2015 2014 2013 (in thousands)Acquisition of properties: (1)     Proved properties$3,561 $11,973 $28,698Unproved properties15 45,999 3,390Development costs (2)552,104 608,176 338,294Exploration costs: (3)     Exploratory drilling— — 58,988Geological and geophysical— 1 752Total costs incurred$555,680 $666,149 $430,122      __________(1)Property acquisition costs represent costs incurred to purchase, lease or otherwise acquire a property.(2)Development costs represent costs incurred to gain access to and prepare development well locations for drilling, drill and equip development wells, recomplete wells and provide facilities to extract, treat, gather and store crude oil, natural gas and NGLs. Of these costs incurred for the years ended December 31, 2015, 2014 and 2013, $207.8 million, $125.2 million and $40.1 million, respectively, were incurred to convert proved undeveloped reserves to proved developed reserves from the prior year end. (3)Exploration costs - represents costs incurred in identifying areas that may warrant examination and in examining specific areas that are considered to have prospects of containing crude oil, natural gas and NGLs.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Table Text Block]                                                                                          | Aggregate capitalized costs related to crude oil and natural gas exploration and production activities with applicable accumulated DD&A are presented below:  As of December 31, 2015 2014  (in thousands)    Proved crude oil and natural gas properties$2,881,189 $2,267,165Unproved crude oil and natural gas properties60,498 188,206Uncompleted wells, equipment and facilities109,385 164,402Capitalized costs3,051,072 2,619,773Less accumulated DD&A(1,131,705) (808,431)Capitalized costs, net$1,919,367 $1,811,342                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| Standardized Measure of Discounted Future Cash Flows Relating to Proved Reserves Disclosure [Table Text Block]                                                                        | The following table presents information with respect to the standardized measure of discounted future net cash flows relating to proved reserves. Changes in the demand for crude oil, natural gas and NGLs, inflation and other factors make such estimates inherently imprecise and subject to substantial revision. This table should not be construed to be an estimate of the current market value of our proved reserves.  As of December 31, 2015 2014 2013 (in thousands)      Future estimated cash flows$6,297,298 $12,550,515 $11,550,917Future estimated production costs*(1,577,393) (2,816,776) (2,329,836)Future estimated development costs(1,952,332) (2,458,790) (2,778,148)Future estimated income tax expense(508,332) (2,336,510) (2,119,615)Future net cash flows2,259,241 4,938,439 4,323,31810% annual discount for estimated timing of cash flows(1,162,377) (2,631,974) (2,541,155)Standardized measure of discounted future estimated net cash flows$1,096,864 $2,306,465 $1,782,163      ___________* Represents future estimated lease operating expenses, production taxes, transportation, gathering and processing expenses and plugging and abandonment costs, net of salvage value.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |
| Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows [Table Text Block]                                                                                    | The following table presents the principal sources of change in the standardized measure of discounted future estimated net cash flows:  Year Ended December 31, 2015 2014 2013 (in thousands)      Sales of crude oil, natural gas and NGLs production, net of production costs$(293,127) $(387,789) $(286,021)Net changes in prices and production costs (1)(1,752,921) 129,213 89,527Extensions, discoveries, and improved recovery, including infill reserves in an existing proved field, less related costs (2)489,178 1,444,581 1,529,006Sales of reserves (3)(463) (402,595) (142,724)Purchases of reserves (4)374 238 10,610Development costs incurred during the period368,840 161,404 46,366Revisions of previous quantity estimates (5)(1,286,462) (654,318) (397,738)Changes in estimated income taxes (6)902,994 (221,874) (381,369)Net changes in future development costs112,958 46,499 (40,707)Accretion of discount345,007 270,389 142,040Timing and other(95,979) 138,554 44,676Total$(1,209,601) $524,302 $613,666      __________(1)Our weighted-average price, net of production costs per Boe, in our 2015 reserve report decreased to $17.30 as compared to $37.78 in our 2014 reserve report. This is due to the significant decrease in SEC commodity prices utilized in the 2015 reserve report. Our weighted-average price, net of production costs per Boe, in our 2014 reserve report increased to $37.78 from $30.82 in our 2013 reserve report. This is due to the divestiture of our Marcellus Shale reserves during 2014 which further increased our liquids as a percentage of proved reserves.(2)The 66% decrease in 2015 indicates a significant decrease in the value of the extensions in 2015 as compared to the value of the extensions in 2014. This is primarily due to lower SEC commodity prices utilized in the 2015 reserve report. The 6% decrease in 2014 as compared to 2013 is primarily due to a scheduled maximum rig count of six rigs by 2016 as compared to a scheduled maximum rig count of seven in the 2013 year-end reserve report, partially offset by our increased PUD count in the Wattenberg Field resulting from successful downspacing tests in 2014.(3)The decrease in sales of reserves in 2015 was due to the fact that no major divestitures were completed in 2015. The increase in sales of reserves in 2014 as compared to 2013 was due to the divestiture of our Marcellus shale assets in October 2014.(4)The decrease in purchases of reserves in 2015 and 2014 as compared to the respective prior years was due to no material acquisitions having occurred.(5)The change in revisions of our previous quantity estimates in 2015 as compared to 2014 was primarily due to adjustments due to our drilling schedule. The change in revisions of our previous quantity estimates in 2014 as compared to 2013 was primarily due to adjustments due to our drilling schedule.(6)The change in estimated income taxes for each year as compared to the prior year is the direct result of the significant changes in discounted future net cash flows, as the projected deferred tax rate remained relatively unchanged at approximately 38% for each of the three years ended December 31, 2015, 2014 and 2013. In addition, the Company continued to capitalize and amortize the majority of its yearly capital expenditures and there were no changes in the assumptions as to the tax deductibility of beginning unamortized capital, additional current year capital or future development capital.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           |

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| - Definition
Schedule of Prices Used to Estimate Natural Gas and Crude Oil Reserves [Table Text Block]
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Supplemental Information on Natural Gas and Oil Exploration, Development and Production Activities [Abstract]
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| - Definition
Tabular disclosure of aggregate capitalized costs relating to an enterprise's oil and gas producing activities and the aggregate related accumulated depreciation, depletion, amortization, and valuation allowances.
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| - Definition
Tabular disclosure of the aggregate of costs (whether the costs are capitalized or charged to expense at the time they are incurred ) incurred for the year in oil and gas property acquisition, exploration and development activities.
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| - Definition
Tabular disclosure of the results of operations for oil and gas producing activities for the year.
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| - Definition
Tabular disclosure of the aggregate change in the standardized measure of discounted future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchases under long-term agreements in which the enterprise participates in the operation of the properties on which oil and gas is located or otherwise serves as the producer.
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| - Definition
Tabular disclosure of the net quantities of an enterprise's interests in proved developed and undeveloped reserves of (a) crude oil (including condensate and natural gas liquids), (b) natural gas (including coal bed methane), (c) synthetic oil, (d) synthetic gas, and (e) other nonrenewable natural resources that are intended to be upgraded during the period as of the beginning of the period, changes in quantities during the period, and as of the end of the period.
+ References
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| - Definition
Tabular disclosure of the future net cash flows relating to proved oil and gas reserves and oil and gas subject to purchase under long-term agreements in which the enterprise participates in the operation of the properties on which the oil and gas is located or otherwise serves as the producer. This information is presented in aggregate and for each geographic area for which reserve quantities are disclosed.
+ References
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