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Derivative Financial Instruments (Tables) | 6 Months Ended
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Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] | The following tables summarize the approximate volumes and average contract prices of contracts the Company had in place as of June 30, 2013: Oil Contracts Oil Swaps
Contract Period |  | Volumes |  | Weighted-Average Contract Price
|  | (Bbls) |  | (per Bbl)
Remainder of 2013 |  | 2,383,000 |  |  | $ | 97.51 |
2014 |  | 2,024,000 |  |  | $ | 93.85 |
2015 |  | 356,000 |  |  | $ | 88.40 |
All oil swaps* |  | 4,763,000 |  |  |
*Oil swaps are comprised of NYMEX WTI (71%) and Argus LLS (29%). Oil Collars
Contract Period |  | NYMEX WTI Volumes |  | Weighted- Average Floor Price |  | Weighted- Average Ceiling Price
|  | (Bbls) |  | (per Bbl) |  | (per Bbl)
Remainder of 2013 |  | 1,491,000 |  |  | $ | 77.88 |  |  | $ | 111.93 |
2014 |  | 3,022,000 |  |  | $ | 84.07 |  |  | $ | 105.46 |
2015 |  | 3,366,000 |  |  | $ | 85.00 |  |  | $ | 94.25 |
All oil collars |  | 7,879,000 |  |  |  |  |
Gas Contracts Gas Swaps
Contract Period |  | Volumes |  | Weighted-Average Contract Price
|  | (MMBtu) |  | (per MMBtu)
Remainder of 2013 |  | 40,335,000 |  |  | $ | 4.00 |
2014 |  | 59,384,000 |  |  | $ | 4.08 |
2015 |  | 33,528,000 |  |  | $ | 4.07 |
2016 |  | 10,331,000 |  |  | $ | 4.38 |
All gas swaps* |  | 143,578,000 |  |  |
*Gas swaps are comprised of IF El Paso Permian (3%), IF HSC (58%), IF NGPL TXOK (5%), IF NNG Ventura (3%), IF PEPL (13%), IF Reliant N/S (15%), IF TETCO STX (1%), and IF NGPL MidCont (2%). Gas Collars
Contract Period |  | Volumes |  | Weighted- Average Floor Price |  | Weighted- Average Ceiling Price
|  | (MMBtu) |  | (per MMBtu) |  | (per MMBtu)
Remainder of 2013 |  | 3,410,000 |  |  | $ | 4.39 |  |  | $ | 5.31 |
2014 |  | 5,734,000 |  |  | $ | 4.38 |  |  | $ | 5.36 |
2015 |  | 14,480,000 |  |  | $ | 3.96 |  |  | $ | 4.30 |
All gas collars* |  | 23,624,000 |  |  |  |  |
*Gas collars are comprised of IF El Paso Permian (2%), IF HSC (51%), IF NGPL TXOK (6%), IF NNG Ventura (4%), IF PEPL (6%), IF Reliant N/S (17%), and IF TETCO STX (14%). NGL Contracts NGL Swaps
Contract Period |  | Volumes |  | Weighted-Average Contract Price
|  | (Bbls) |  | (per Bbl)
Remainder of 2013 |  | 1,077,000 |  |  | $ | 53.26 |
2014 |  | 404,000 |  |  | $ | 58.42 |
All NGL swaps* |  | 1,481,000 |  |  |
*NGL swaps are comprised of OPIS Mont. Belvieu Purity Ethane (9%), OPIS Mont. Belvieu LDH Propane (44%), OPIS Mont. Belvieu NON-LDH Isobutane (12%), OPIS Mont. Belvieu NON-LDH Normal Butane (16%), and OPIS Mont. Belvieu NON-LDH Natural Gasoline (19%).
Schedule of fair value of derivatives in accompanying balance sheets | The following tables detail the fair value of derivatives recorded in the accompanying balance sheets, by category:
| As of June 30, 2013
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity contracts | Current assets |  | $ | 58,071 |  |  | Current liabilities |  | $ | 4,748 |
Commodity contracts | Noncurrent assets |  | 28,798 |  |  | Noncurrent liabilities |  | 1,525 |
Derivatives not designated as hedging instruments |  |  | $ | 86,869 |  |  |  |  | $ | 6,273 |
| As of December 31, 2012
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity contracts | Current assets |  | $ | 37,873 |  |  | Current liabilities |  | $ | 8,999 |
Commodity contracts | Noncurrent assets |  | 16,466 |  |  | Noncurrent liabilities |  | 6,645 |
Derivatives not designated as hedging instruments |  |  | $ | 54,339 |  |  |  |  | $ | 15,644 |
Schedule of the potential effects of master netting arrangements [Table Text Block] | The following table provides a reconciliation between the gross assets and liabilities reflected on the accompanying balance sheets and the potential effects of master netting arrangements on the fair value of the Company's derivative contracts:
|  | Derivative Assets |  | Derivative Liabilities
|  | As of |  | As of
Offsetting of Derivative Assets and Liabilities |  | June 30, 2013 |  | December 31, 2012 |  | June 30, 2013 |  | December 31, 2012
|  | (in thousands)
Gross amounts presented in the accompanying balance sheets |  | $ | 86,869 |  |  | $ | 54,339 |  |  | $ | (6,273 | ) |  | $ | (15,644 | )
Amounts not offset in the accompanying balance sheets |  | (6,273 | ) |  | (13,400 | ) |  | 6,273 |  |  | 13,400 |
Net amounts |  | $ | 80,596 |  |  | $ | 40,939 |  |  | $ | — |  |  | $ | (2,244 | )
Schedule of unrealized and realized gains and losses on derivative instruments in the statement of operations | The following table summarizes the components of unrealized and realized derivative gain presented in the accompanying statements of operations:
| For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| 2013 |  | 2012 |  | 2013 |  | 2012
| (in thousands)
Cash settlement (gain) loss: |  |  |  |  |  |  |
Oil contracts | $ | (29 | ) |  | $ | 2,371 |  |  | $ | 248 |  |  | $ | 10,670 |
Gas contracts | 2,091 |  |  | (16,252 | ) |  | (7,733 | ) |  | (31,464 | )
NGL contracts | (4,273 | ) |  | (2,565 | ) |  | (6,518 | ) |  | (1,088 | )
Total cash settlement gain | $ | (2,211 | ) |  | $ | (16,446 | ) |  | $ | (14,003 | ) |  | $ | (21,882 | )
Unrealized (gain) loss on change in fair value: |  |  |  |  |  |  |
Oil contracts | $ | (26,044 | ) |  | $ | (92,774 | ) |  | $ | (22,255 | ) |  | $ | (63,283 | )
Gas contracts | (50,267 | ) |  | 29,867 |  |  | (10,198 | ) |  | 12,233 |
NGL contracts | (6,668 | ) |  | (18,759 | ) |  | (8,162 | ) |  | (22,964 | )
Total net unrealized gain on change in fair value | (82,979 | ) |  | (81,666 | ) |  | (40,615 | ) |  | (74,014 | )
Total unrealized and realized derivative gain | $ | (85,190 | ) |  | $ | (98,112 | ) |  | $ | (54,618 | ) |  | $ | (95,896 | )
Detail of the effect of derivative instruments reclassified from AOCI to the statement of operations (net of income tax) | The following table summarizes the effect of derivative instruments on AOCIL and the accompanying statements of operations (net of income tax):
|  |  | Location in Statements of Operations |  | For the Three Months Ended June 30, |  | For the Six Months Ended June 30,
| Derivatives |  |  | 2013 |  | 2012 |  | 2013 |  | 2012
|  |  |  |  | (in thousands)
Amount reclassified from AOCIL | Commodity contracts |  | Realized hedge gain (loss) |  | $ | 746 |  |  | $ | (116 | ) |  | $ | 807 |  |  | $ | (1,150 | )

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- Definition Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph b -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -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. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44C -Subparagraph a -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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