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Derivative Financial Instruments (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Derivative Financial Instruments |  |  |  |
Fair value of oil, natural gas, NGL commodity derivative markets | $ 80,600,000 | $ 38,700,000 | $ 80,600,000 | $ 38,700,000
Derivative (gains) losses relating to de-designated commodity hedges reclassified from AOCL to earnings net of tax | 746,000 | (116,000) | 807,000 | (1,150,000)
Derivatives not designated as hedging instruments |  |  |  |
Derivative Financial Instruments |  |  |  |
Gains expected to be reclassifiied into earnings from AOCL after-tax net loss related to de-designated commodity derivative contracts |  |  | $ 300,000 |
Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 12,600,000 |  | 12,600,000 |
Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 167,200,000 |  | 167,200,000 |
Natural Gas Liquids |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 1,500,000 |  | 1,500,000 |
NYMEX WTI [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of oil fixed swap | 71.00% |  | 71.00% |
Argus LLS [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of oil fixed swap | 29.00% |  | 29.00% |
IF El Paso Permian [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 3.00% |  | 3.00% |
Index percent of natural gas collars | 2.00% |  | 2.00% |
IF HSC [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 58.00% |  | 58.00% |
Index percent of natural gas collars | 51.00% |  | 51.00% |
IF NGPL TXOK [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 5.00% |  | 5.00% |
Index percent of natural gas collars | 6.00% |  | 6.00% |
IF NNG Ventura [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 3.00% |  | 3.00% |
Index percent of natural gas collars | 4.00% |  | 4.00% |
IF PEPL [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 13.00% |  | 13.00% |
Index percent of natural gas collars | 6.00% |  | 6.00% |
IF Reliant N/S [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 15.00% |  | 15.00% |
Index percent of natural gas collars | 17.00% |  | 17.00% |
IF TETCO STX [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 1.00% |  | 1.00% |
Index percent of natural gas collars | 14.00% |  | 14.00% |
IF NGPL MidCont [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of natural gas fixed swaps | 2.00% |  | 2.00% |
OPIS Mont. Belvieu Ethane Purity [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of NGL fixed swaps | 9.00% |  | 9.00% |
OPIS Mont. Belvieu LDH Propane [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of NGL fixed swaps | 44.00% |  | 44.00% |
OPIS Mont. Belvieu Non LDH Isobutane [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of NGL fixed swaps | 12.00% |  | 12.00% |
OPIS Mont. Belvieu Non-LDH Normal Butane [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of NGL fixed swaps | 16.00% |  | 16.00% |
OPIS Mont. Belvieu Non-LDH Natural Gasoline [Member] |  |  |  |
Derivative Financial Instruments |  |  |  |
Index percent of NGL fixed swaps | 19.00% |  | 19.00% |
Swap | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 4,763,000 |  | 4,763,000 |
Swap | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 143,578,000 |  | 143,578,000 |
Swap | Natural Gas Liquids |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 1,481,000 |  | 1,481,000 |
Collar | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 7,879,000 |  | 7,879,000 |
Collar | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 23,624,000 |  | 23,624,000 |
Remainder of 2013 [Member] | Swap | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 2,383,000 |  | 2,383,000 |
Weighted-Average Contract Price | 97.51 |  | 97.51 |
Remainder of 2013 [Member] | Swap | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 40,335,000 |  | 40,335,000 |
Weighted-Average Contract Price | 4.00 |  | 4.00 |
Remainder of 2013 [Member] | Swap | Natural Gas Liquids |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 1,077,000 |  | 1,077,000 |
Weighted-Average Contract Price | 53.26 |  | 53.26 |
Remainder of 2013 [Member] | Collar | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 1,491,000 |  | 1,491,000 |
Weighted-Average Floor Price | 77.88 |  | 77.88 |
Weighted-Average Ceiling Price | 111.93 |  | 111.93 |
Remainder of 2013 [Member] | Collar | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 3,410,000 |  | 3,410,000 |
Weighted-Average Floor Price | 4.39 |  | 4.39 |
Weighted-Average Ceiling Price | 5.31 |  | 5.31 |
2014 [Member] | Swap | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 2,024,000 |  | 2,024,000 |
Weighted-Average Contract Price | 93.85 |  | 93.85 |
2014 [Member] | Swap | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 59,384,000 |  | 59,384,000 |
Weighted-Average Contract Price | 4.08 |  | 4.08 |
2014 [Member] | Swap | Natural Gas Liquids |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 404,000 |  | 404,000 |
Weighted-Average Contract Price | 58.42 |  | 58.42 |
2014 [Member] | Collar | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 3,022,000 |  | 3,022,000 |
Weighted-Average Floor Price | 84.07 |  | 84.07 |
Weighted-Average Ceiling Price | 105.46 |  | 105.46 |
2014 [Member] | Collar | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 5,734,000 |  | 5,734,000 |
Weighted-Average Floor Price | 4.38 |  | 4.38 |
Weighted-Average Ceiling Price | 5.36 |  | 5.36 |
2015 [Member] | Swap | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 356,000 |  | 356,000 |
Weighted-Average Contract Price | 88.40 |  | 88.40 |
2015 [Member] | Swap | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 33,528,000 |  | 33,528,000 |
Weighted-Average Contract Price | 4.07 |  | 4.07 |
2015 [Member] | Collar | Crude oil |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Future Oil and Gas Production Being Hedged | 3,366,000 |  | 3,366,000 |
Weighted-Average Floor Price | 85.00 |  | 85.00 |
Weighted-Average Ceiling Price | 94.25 |  | 94.25 |
2015 [Member] | Collar | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 14,480,000 |  | 14,480,000 |
Weighted-Average Floor Price | 3.96 |  | 3.96 |
Weighted-Average Ceiling Price | 4.30 |  | 4.30 |
2016 [Member] | Swap | Natural Gas |  |  |  |
Derivative Financial Instruments |  |  |  |
Portion of Gas Production Being Hedged | 10,331,000 |  | 10,331,000 |
Weighted-Average Contract Price | 4.38 |  | 4.38 |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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 Average fixed price related to the group of price risk swap derivatives. + 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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