| **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]                                                                                             | The price used to estimate our reserves, by commodity, are presented below.  Price Used to Estimate ReservesAs of December 31, Crude Oil(per Bbl) Natural Gas(per Mcf) NGLs(per Bbl)       2014 $84.65 $3.92 $32.272013 82.18 3.22 29.922012 87.51 2.35 28.02                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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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, 2012 (1)37,636 672,145 19,588 169,248Revisions of previous estimates(6,729) (289,436) (3,671) (58,639)Extensions, discoveries and other additions27,482 172,933 11,637 67,941Purchases of reserves10,801 87,212 8,084 33,420Dispositions(7,854) (6,406) (1,970) (10,891)Production(2,026) (32,410) (841) (8,269)Proved reserves, December 31, 2012 (2)59,310 604,038 32,827 192,810Revisions of previous estimates(18,420) (117,068) (8,549) (46,480)Extensions, discoveries and other additions55,759 365,563 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 (3)93,830 739,640 48,671 265,774Revisions of previous estimates(29,777) (149,064) (10,204) (64,825)Extensions, discoveries and other additions40,792 202,957 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 60,119 250,129        Proved Developed Reserves, as of:       January 1, 2012 (1)16,910 299,369 11,753 78,558December 31, 2012 (2)20,412 281,925 14,353 81,753December 31, 2013 (3)23,997 220,387 14,825 75,553December 31, 201426,798 186,633 17,002 74,905Proved Undeveloped Reserves, as of:      January 1, 2012 (1)20,726 372,776 7,835 90,690December 31, 2012 (2)38,898 322,113 18,474 111,058December 31, 2013 (3)69,833 519,253 33,846 190,221December 31, 201473,717 350,339 43,117 175,224        __________(1)Includes estimated reserve data related to our Permian Basin assets, which were divested in February 2012. See Note 14, Assets Held for Sale, Divestitures and Discontinued Operations, for additional details related to the divestiture of our Permian Basin assets. Total proved reserves included 7,825 MBbls of crude oil, 6,242 MMcf of natural gas and 1,970 MBbls of NGLs, for an aggregate of 10,835 Mboe of crude oil equivalent, related to our Permian assets. Total proved developed reserves related to those assets included 1,815 MBbls, 1,750 MMcf, 550 MBbls and 2,657 MBoe, respectively, and proved undeveloped reserves included 6,010 MBbls, 4,492 MMcf, 1,420 MBbls and 8,179 MBoe, respectively.(2)Includes estimated reserve data related to our Piceance and NECO assets, which were divested in June 2013. See Note 14, 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.(3)Includes estimated reserve data related to our Marcellus Shale assets, which were divested in October 2014. See Note 14, 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, 201278,558 90,690 169,248Undeveloped reserves converted to developed7,655 (7,655) —Revisions of previous estimates(18,318) (40,321) (58,639)Extensions, discoveries and other additions11,298 56,643 67,941Purchases of reserves13,542 19,878 33,420Dispositions(2,713) (8,178) (10,891)Production(8,269) — (8,269)Ending proved reserves, December 31, 201281,753 111,057 192,810Undeveloped reserves converted to developed3,212 (3,212) —Revisions of previous estimates(6,751) (39,729) (46,480)Extensions, discoveries and other additions19,830 122,105 141,935Purchases of reserves1,043 — 1,043Dispositions(16,104) — (16,104)Production(7,430) — (7,430)Ending proved reserves, December 31, 201375,553 190,221 265,774Undeveloped reserves converted to developed12,730 (12,730) —Revisions of previous estimates(22,827) (41,998) (64,825)Extensions, discoveries and other additions27,957 70,072 98,029Purchases of reserves17 — 17Dispositions(9,231) (30,341) (39,572)Production(9,294) — (9,294)Ending proved reserves, December 31, 201474,905 175,224 250,129       |
| 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 31,2014 2013 2012(in thousands)Revenue:  Crude oil, natural gas and NGLs sales$495,562 $379,796 $274,783Commodity price risk management gain, net309,219 (23,905) 32,339804,781 355,891 307,122Expenses:     Production costs90,744 81,365 77,537Exploration expense948 7,071 22,605Impairment of proved crude oil and natural gas properties163,965 53,438 162,287Depreciation, depletion, and amortization201,656 124,202 146,879Accretion of asset retirement obligations3,455 4,747 4,060(Gain) loss on sale of  properties and equipment(75,972) 3,722 (24,273)384,796 274,545 389,095Results of operations for crude oil and natural gas producingactivities before provision for income taxes419,985 81,346 (81,973)     Provision for income taxes(163,647) (29,400) 31,163  Results of operations for crude oil and natural gas producing activities, excluding corporate overhead and interest costs$256,338 $51,946 $(50,810)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              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| 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, 2014 2013 2012 (in thousands)Acquisition of properties: (1)     Proved properties$11,973 $28,698 $105,303Unproved properties45,999 3,390 276,225Development costs (2)590,855 332,250 233,144Exploration costs: (3)     Exploratory drilling— 58,988 18,803Geological and geophysical1 752 1,925Total costs incurred$648,828 $424,078 $635,400      __________(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, 2014, 2013 and 2012, $125.2 million, $40.1 million and $62.0 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, 2014 2013  (in thousands)    Proved crude oil and natural gas properties$2,267,165 $1,677,271Unproved crude oil and natural gas properties188,206 253,463Uncompleted wells, equipment and facilities137,134 40,745Capitalized costs2,592,505 1,971,479Less accumulated DD&A(808,431) (507,510)Capitalized costs, net$1,784,074 $1,463,969                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         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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, 2014 2013 2012 (in thousands)      Future estimated cash flows$12,550,515 $11,550,917 $7,529,292Future estimated production costs(2,816,776) (2,329,836) (1,690,453)Future estimated development costs(2,458,790) (2,778,148) (1,852,177)Future estimated income tax expense(2,336,510) (2,119,615) (1,230,294)Future net cash flows4,938,439 4,323,318 2,756,36810% annual discount for estimated timing of cash flows(2,631,974) (2,541,155) (1,587,871)Standardized measure of discounted future estimated net cash flows$2,306,465 $1,782,163 $1,168,497                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            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| 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, 2014 2013 2012 (in thousands)      Sales of crude oil, natural gas and NGLs production, net of production costs$(387,789) $(286,021) $(194,346)Net changes in prices and production costs (1)129,213 89,527 95,501Extensions, discoveries, and improved recovery, less related costs (2)1,444,581 1,529,006 632,781Sales of reserves (3)(402,595) (142,724) (86,902)Purchases of reserves (4)238 10,610 296,208Development costs incurred during the period161,404 46,366 69,198Revisions of previous quantity estimates (5)(654,318) (397,738) (452,775)Changes in estimated income taxes (6)(221,874) (381,369) (131,256)Net changes in future development costs46,499 (40,707) (3,979)Accretion of discount270,389 142,040 124,105Timing and other138,554 44,676 (121,247)Total$524,302 $613,666 $227,288      __________(1)Our weighted-average price, net of production costs per Boe, in our 2014 reserve report increased to $37.78 as compared to $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. Our weighted-average price, net of production costs per Boe, in our 2013 reserve report increased to $30.82 from $30.28 in our 2012 report due to the divestiture of our Piceance, NECO and our shallow Upper Devonian (non-Marcellus Shale) reserves during 2013 which increased our liquids as a percentage of proved reserves.(2)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. The 142% increase in 2013 as compared to 2012 is primarily due to the addition of PUDs in the Utica Shale and our continued focus on our Wattenberg Field drilling program. Our increased PUD count in the Wattenberg Field is a result of successful downspacing tests in 2013 leading to a scheduled maximum rig count of seven rigs by 2016 as compared to a scheduled maximum rig count of five in the 2012 year-end reserve report.    (3)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. The increase in sales of reserves in 2013 as compared to 2012 was due to the divestiture of our Piceance and NECO assets in June 2013 and our shallow Upper Devonian (non-Marcellus Shale) assets in December of 2013.(4)The decrease in purchases of reserves in 2014 and 2013 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 2014 as compared to 2013 was primarily due to adjustments due to our drilling schedule. The change in revisions of our previous quantity estimates in 2013 as compared to 2012 was primarily due to adjustment in 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 increase in discounted future net cash flows, as the projected deferred tax rate remained relatively unchanged at approximately 38%, 38% and 38.2% for the years ended December 31, 2014, 2013 and 2012, respectively. 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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No definition available.
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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.
+ References
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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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