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Derivative instruments (Tables) | 12 Months Ended
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Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |
Schedule of derivative instruments, gain (losses) [Table Text Block] | The gains and losses on derivative instruments for the years ended December 31 were as follows:
| 2012 |  | 2011 |  | 2010 |
| (In thousands)
Commodity derivatives designated as cash flow hedges: |  |  |
Amount of gain (loss) recognized in accumulated other comprehensive loss (effective portion), net of tax | $ | 10,209 |  | $ | 10,806 |  | $ | (3,077 | )
Amount of gain (loss) reclassified from accumulated other comprehensive loss into operating revenues (effective portion), net of tax | 8,788 |  | — |  | (3,720 | )
Amount of gain (loss) recognized in operating revenues (ineffective portion), before tax | (730 | ) | 1,827 |  | — |
Interest rate derivatives designated as cash flow hedges: |  |  |
Amount of loss recognized in accumulated other comprehensive loss (effective portion), net of tax | (1,712 | ) | (2,906 | ) | — |
Amount of loss reclassified from accumulated other comprehensive loss into interest expense (effective portion), net of tax | (34 | ) | — |  | (30 | )
Amount of gain (loss) recognized in interest expense (ineffective portion), before tax | — |  | — |  | — |
Commodity derivatives not designated as hedging instruments: |  |  |
Amount of gain recognized in operating revenues, before tax | 106 |  | — |  | — |
Derivative instruments (Tables) | The location and fair value of the Company's derivative instruments on the Consolidated Balance Sheets were as follows:
Asset Derivatives | Location on Consolidated Balance Sheets | Fair Value at December 31, 2012 |  | Fair Value at December 31, 2011 |
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | 18,084 |  | $ | 27,687 |
| Other assets - noncurrent | — |  | 2,768 |
|  | 18,084 |  | 30,455 |
Not designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | 220 |  | — |
|  | 220 |  | — |
Total asset derivatives |  | $ | 18,304 |  | $ | 30,455 |
Liability Derivatives | Location on Consolidated Balance Sheets | Fair Value at December 31, 2012 |  | Fair Value at December 31, 2011 |
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | — |  | $ | 12,727 |
| Other liabilities - noncurrent | — |  | 937 |
Interest rate derivatives | Other accrued liabilities | 6,255 |  | 827 |
| Other liabilities - noncurrent | — |  | 3,935 |
|  | 6,255 |  | 18,426 |
Not designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | — |  | 437 |
|  | — |  | 437 |
Total liability derivatives |  | $ | 6,255 |  | $ | 18,863 |

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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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