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Derivative instruments (Tables) | 6 Months Ended
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Jun. 30, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Derivative Instruments (Tables) | The location and fair value of the Company's derivative instruments in the Consolidated Balance Sheets were as follows:
Asset Derivatives | Location on Consolidated Balance Sheets | Fair Value at June 30, 2012 | Fair Value at June 30, 2011 | Fair Value at December 31, 2011
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | 36,360 |  | $ | 14,040 |  | $ | 27,687 |
| Other assets - noncurrent | 11,445 |  | 6,265 |  | 2,768 |
|  | 47,805 |  | 20,305 |  | 30,455 |
Not designated as hedges: |  |  |  |
Commodity derivatives | Commodity derivative instruments | 640 |  | 194 |  | — |
| Other assets - noncurrent | 212 |  | — |  | — |
|  | 852 |  | 194 |  | — |
Total asset derivatives |  | $ | 48,657 |  | $ | 20,499 |  | $ | 30,455 |
Liability Derivatives | Location on Consolidated Balance Sheets | Fair Value at June 30, 2012 | Fair Value at June 30, 2011 | Fair Value at December 31, 2011
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | 789 |  | $ | 17,780 |  | $ | 12,727 |
| Other liabilities - noncurrent | — |  | 6,735 |  | 937 |
Interest rate derivatives | Other accrued liabilities | 6,963 |  | — |  | 827 |
| Other liabilities - noncurrent | — |  | — |  | 3,935 |
|  | 7,752 |  | 24,515 |  | 18,426 |
Not designated as hedges: |  |  |  |  |  |
Commodity derivatives | Commodity derivative instruments | 248 |  | 906 |  | 437 |
| Other liabilities - noncurrent | — |  | — |  | — |
|  | 248 |  | 906 |  | 437 |
Total liability derivatives |  | $ | 8,000 |  | $ | 25,421 |  | $ | 18,863 |

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 205G -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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