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Derivative Financial Instruments (Details) | Dec. 31, 2013 Crude Oil [Member] bbl | Dec. 31, 2013 Natural Gas [Member] MMBTU | Dec. 31, 2013 Natural Gas Liquids [Member] bbl | Dec. 31, 2013 NYMEX WTI [Member] | Dec. 31, 2013 Argus LLS [Member] | Dec. 31, 2013 IF El Paso Permian [Member] | Dec. 31, 2013 IF HSC [Member] | Dec. 31, 2013 IF NGPL TXOK [Member] | Dec. 31, 2013 IF NNG Ventura [Member] | Sep. 30, 2013 IF NNG Ventura [Member] | Dec. 31, 2013 IF PEPL [Member] | Dec. 31, 2013 IF Reliant N/S [Member] | Dec. 31, 2013 IF NGPL MidCont [Member] | Dec. 31, 2013 IF TETCO STX [Member] | Dec. 31, 2013 OPIS IsoButane Mt Belv Non TET [Member] | Dec. 31, 2013 OPIS Natural Gasoline Mt Belv Non TET [Member] | Dec. 31, 2013 OPIS NButane Mt Belv Non TET [Member] | Dec. 31, 2013 OPIS Propane Mt Belv TET [Member] | Dec. 31, 2013 Swap [Member] Crude Oil [Member] bbl | Dec. 31, 2013 Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 Swap [Member] Natural Gas Liquids [Member] bbl | Dec. 31, 2013 Collar [Member] Crude Oil [Member] bbl | Dec. 31, 2013 Collar [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 First Quarter of 2014 [Member] Swap [Member] Crude Oil [Member] bbl | Dec. 31, 2013 First Quarter of 2014 [Member] Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 First Quarter of 2014 [Member] Swap [Member] Natural Gas Liquids [Member] bbl | Dec. 31, 2013 First Quarter of 2014 [Member] Collar [Member] Crude Oil [Member] bbl | Dec. 31, 2013 First Quarter of 2014 [Member] Collar [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 Second Quarter of 2014 [Member] Swap [Member] Crude Oil [Member] bbl | Dec. 31, 2013 Second Quarter of 2014 [Member] Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 Second Quarter of 2014 [Member] Swap [Member] Natural Gas Liquids [Member] bbl | Dec. 31, 2013 Second Quarter of 2014 [Member] Collar [Member] Crude Oil [Member] bbl | Dec. 31, 2013 Second Quarter of 2014 [Member] Collar [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 Third Quarter of 2014 [Member] Swap [Member] Crude Oil [Member] bbl | Dec. 31, 2013 Third Quarter of 2014 [Member] Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 Third Quarter of 2014 [Member] Swap [Member] Natural Gas Liquids [Member] bbl | Dec. 31, 2013 Third Quarter of 2014 [Member] Collar [Member] Crude Oil [Member] bbl | Dec. 31, 2013 Fourth Quarter of 2014Member] Swap [Member] Crude Oil [Member] bbl | Dec. 31, 2013 Fourth Quarter of 2014Member] Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 Fourth Quarter of 2014Member] Swap [Member] Natural Gas Liquids [Member] bbl | Dec. 31, 2013 Fourth Quarter of 2014Member] Collar [Member] Crude Oil [Member] bbl | Dec. 31, 2013 2015 [Member] Swap [Member] Crude Oil [Member] bbl | Dec. 31, 2013 2015 [Member] Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 2015 [Member] Collar [Member] Crude Oil [Member] bbl | Dec. 31, 2013 2015 [Member] Collar [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 2016 [Member] Swap [Member] Crude Oil [Member] bbl | Dec. 31, 2013 2016 [Member] Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 2017 [Member] Swap [Member] Natural Gas [Member] MMBTU | Dec. 31, 2013 2018 [Member] Swap [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] Crude Oil [Member] bbl | Feb. 12, 2014 Subsequent Event [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] Natural Gas Liquids [Member] bbl | Feb. 12, 2014 Subsequent Event [Member] IF NNG Ventura [Member] | Feb. 12, 2014 Subsequent Event [Member] OPIS Natural Gasoline Mt Belv Non TET [Member] | Feb. 12, 2014 Subsequent Event [Member] OPIS Propane Mt Belv TET [Member] | Feb. 12, 2014 Subsequent Event [Member] IF CIG N System [Member] | Feb. 12, 2014 Subsequent Event [Member] Swap [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] Swap [Member] Natural Gas Liquids [Member] bbl | Feb. 12, 2014 Subsequent Event [Member] First Quarter of 2014 [Member] Swap [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] First Quarter of 2014 [Member] Swap [Member] Natural Gas Liquids [Member] bbl | Feb. 12, 2014 Subsequent Event [Member] Second Quarter of 2014 [Member] Swap [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] Second Quarter of 2014 [Member] Swap [Member] Natural Gas Liquids [Member] bbl | Feb. 12, 2014 Subsequent Event [Member] Third Quarter of 2014 [Member] Swap [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] Third Quarter of 2014 [Member] Swap [Member] Natural Gas Liquids [Member] bbl | Feb. 12, 2014 Subsequent Event [Member] Fourth Quarter of 2014Member] Swap [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] Fourth Quarter of 2014Member] Swap [Member] Natural Gas Liquids [Member] bbl | Feb. 12, 2014 Subsequent Event [Member] 2015 [Member] Swap [Member] Natural Gas [Member] MMBTU | Feb. 12, 2014 Subsequent Event [Member] 2016 [Member] Swap [Member] Natural Gas [Member] MMBTU
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Derivative Financial Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Portion of future oil and NGL production included in derivative contracts | 18,800,000 |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,452,000 |  | 2,549,000 | 6,387,000 |  | 2,600,000 |  | 913,000 | 694,000 |  | 2,373,000 |  | 565,000 | 431,000 |  | 973,000 |  | 544,000 | 973,000 | 891,000 |  | 527,000 | 923,000 | 2,911,000 |  | 3,366,000 |  | 2,704,000 |  |  |  | 17,500,000 |  | 4,000,000 |  |  |  |  |  | 1,797,000 |  | 516,000 |  | 531,000 |  | 416,000 |  | 334,000 |  |
Portion of Gas Production Covered Under Derivative Contract |  | 265,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 245,704,000 |  |  | 20,214,000 |  | 33,651,000 |  |  | 1,540,000 |  | 25,729,000 |  |  | 4,194,000 |  | 26,398,000 |  |  |  | 23,965,000 |  |  |  | 63,317,000 |  | 14,480,000 |  | 39,014,000 | 23,430,000 | 10,200,000 |  | 237,900,000 |  |  |  |  |  | 2,490,000 |  | 261,000 |  | 365,000 |  | 341,000 |  | 321,000 |  | 1,133,000 | 69,000
Gas Derivative Contracts Settled Early |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 18,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted- Average Contract Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 96.92 | 4.25 | 59.72 |  |  | 94.95 | 3.96 | 63.22 |  |  | 95.25 | 4.01 | 62.34 |  | 95.16 | 4.01 | 61.57 |  | 89.06 | 4.03 |  |  | 85.19 | 4.18 | 4.21 | 4.31 |  |  |  |  |  |  |  |  |  | 4.39 | 54.85 | 3.84 | 52.53 | 3.89 | 52.47 | 3.97 | 52.52 | 3.72 | 4.12
Index percent of oil fixed swap |  |  |  | 97.00% | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted- Average Floor Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.97 | 4.39 |  |  |  | 85.00 | 4.38 |  |  |  | 85.00 |  |  |  | 85.00 |  |  | 85.00 | 3.96 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted- Average Ceiling Price |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 115.07 | 5.58 |  |  |  | 102.50 | 5.29 |  |  |  | 102.58 |  |  |  | 102.63 |  |  | 94.25 | 4.30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Index percent of natural gas fixed swaps |  |  |  |  |  | 3.00% | 77.00% | 3.00% |  | 2.00% | 6.00% | 8.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  | 70.00% |  |  |  |  |  |  |  |  |  |  |  |
Index percent of natural gas collars |  |  |  |  |  | 2.00% | 57.00% | 3.00% | 5.00% |  | 7.00% | 14.00% |  | 12.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Index percent of NGL fixed swaps |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.00% | 34.00% | 3.00% | 61.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17.00% | 83.00% |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Index percent of natural gas collars + References No definition available. + Details
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- Definition Index percent of natural gas fixed swaps + References No definition available. + Details
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- Definition Index percent of NGL fixed swaps + References No definition available. + Details
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- Definition Index percent of oil fixed swap + References No definition available. + Details
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- Definition Portion of Gas Production Being Hedged + References No definition available. + Details
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- Definition The average cap rate on a group of price risk derivatives such as caps or collars. A payment or receipt is triggered if the market rate exceeds the cap rate on the contract. + References No definition available. + Details
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- Definition The average floor rate on a group of price risk derivatives such as floors or collars. A payment or receipt is triggered if the market rate falls below the floor rate on the contract. + References No definition available. + Details
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- Definition The quantity of future oil and gas production being hedged. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 12.D.3(b)) -URI http://asc.fasb.org/extlink&oid=6601679&loc=d3e516453-122869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 12 -Section D -Paragraph b -Subsection 3 + Details
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