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Derivative Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of fair value of derivatives in accompanying balance sheets | The following table details the fair value of derivatives recorded in the accompanying balance sheets, by category:
| As of March 31, 2013
| Derivative Assets |  | Derivative Liabilities
| Balance Sheet Classification |  | Fair Value |  | Balance Sheet Classification |  | Fair Value
| (in thousands)
Commodity contracts | Current assets |  | $ | 23,364 |  |  | Current liabilities |  | $ | 22,836 |
Commodity contracts | Noncurrent assets |  | 8,571 |  |  | Noncurrent liabilities |  | 12,669 |
Derivatives not designated as hedging instruments |  |  | $ | 31,935 |  |  |  |  | $ | 35,505 |
| 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 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 loss presented in the accompanying statements of operations:
| For the Three Months Ended March 31,
| 2013 |  | 2012
| (in thousands)
Cash settlement (gain) loss: |  |  |
Oil contracts | $ | 277 |  |  | $ | 8,299 |
Gas contracts | (9,824 | ) |  | (15,212 | )
NGL contracts | (2,245 | ) |  | 1,477 |
Total cash settlement (gain) | $ | (11,792 | ) |  | $ | (5,436 | )
Unrealized (gain) loss on change in fair value: |  |  |
Oil contracts | $ | 3,789 |  |  | $ | 29,491 |
Gas contracts | 40,069 |  |  | (17,634 | )
NGL contracts | (1,494 | ) |  | (4,205 | )
Total net unrealized loss on change in fair value | $ | 42,364 |  |  | $ | 7,652 |
Total unrealized and realized derivative loss | $ | 30,572 |  |  | $ | 2,216 |
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 March 31,
| Derivatives |  |  | 2013 |  | 2012
|  |  |  |  | (in thousands)
Amount reclassified from AOCIL | Commodity contracts |  | Other operating revenues |  | $ | 61 |  |  | $ | (1,034 | )

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- Definition Tabular disclosure of the effective portion of gains and losses on derivative instruments (and nonderivative instruments) designated and qualifying in cash flow hedges recorded in accumulated other comprehensive income (loss) during the term of the hedging relationship and reclassified into earnings during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959 + Details
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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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 Reference 2: 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 3: 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 4: 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 + 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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