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Derivative instruments (Tables) | 6 Months Ended
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Jun. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of derivative instruments, gain (losses) | The gains and losses on derivative instruments were as follows:
| Three Months Ended | Six Months Ended
| June 30, | June 30,
| 2013 | 2012 | 2013 | 2012
| (In thousands)
Commodity derivatives designated as cash flow hedges: |  |  |  |
Amount of gain (loss) recognized in accumulated other comprehensive loss (effective portion), net of tax | $ | — |  | $ | 28,018 |  | $ | (6,154 | ) | $ | 23,863 |
Amount of (gain) loss reclassified from accumulated other comprehensive loss into operating revenues (effective portion), net of tax | (871 | ) | (1,840 | ) | (3,714 | ) | (4,687 | )
Amount of gain (loss) recognized in operating revenues (ineffective portion), before tax | — |  | 3,863 |  | (1,422 | ) | (388 | )
Interest rate derivatives designated as cash flow hedges: |  |  |  |
Amount of gain (loss) recognized in accumulated other comprehensive loss (effective portion), net of tax | 254 |  | (2,245 | ) | 560 |  | (1,357 | )
Amount of loss reclassified from accumulated other comprehensive loss into interest expense (effective portion), net of tax | 475 |  | 6 |  | 546 |  | 21 |
Amount of loss recognized in interest expense (ineffective portion), before tax | (610 | ) | — |  | (769 | ) | — |
Commodity derivatives not designated as hedging instruments: |  |  |  |
Amount of gain recognized in operating revenues, before tax | 13,047 |  | 993 |  | 8,637 |  | 1,048 |
Derivative instruments (Tables) | The location and fair value of the gross amount of the Company's derivative instruments on the Consolidated Balance Sheets were as follows:
Asset Derivatives | Location on Consolidated Balance Sheets | Fair Value at June 30, 2013 | Fair Value at June 30, 2012 | Fair Value at December 31, 2012
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | — |  | $ | 36,360 |  | $ | 18,084 |
| Other assets - noncurrent | — |  | 11,445 |  | — |
|  | — |  | 47,805 |  | 18,084 |
Not designated as hedges: |  |  |  |
Commodity derivatives | Commodity derivative instruments | 9,797 |  | 640 |  | 220 |
| Other assets - noncurrent | 1,447 |  | 212 |  | — |
|  | 11,244 |  | 852 |  | 220 |
Total asset derivatives |  | $ | 11,244 |  | $ | 48,657 |  | $ | 18,304 |
Liability Derivatives | Location on Consolidated Balance Sheets | Fair Value at June 30, 2013 | Fair Value at June 30, 2012 | Fair Value at December 31, 2012
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | — |  | $ | 789 |  | $ | — |
Interest rate derivatives | Other accrued liabilities | — |  | 6,963 |  | 6,255 |
|  | — |  | 7,752 |  | 6,255 |
Not designated as hedges: |  |  |  |  |  |
Commodity derivatives | Commodity derivative instruments | 1,388 |  | 248 |  | — |
|  | 1,388 |  | 248 |  | — |
Total liability derivatives |  | $ | 1,388 |  | $ | 8,000 |  | $ | 6,255 |
All of the Company's commodity and interest rate derivative instruments at June 30, 2013 and 2012, and December 31, 2012, were subject to legally enforceable master netting agreements. However, the Company's policy is to not offset fair value amounts for derivative instruments and, as a result, the Company's derivative assets and liabilities are presented gross on the Consolidated Balance Sheets. The gross derivative assets and liabilities (excluding settlement receivables and payables that may be subject to the same master netting agreements) presented on the Consolidated Balance Sheets and the amount eligible for offset under the master netting agreements is presented in the following table:
June 30, 2013 | Gross Amounts Recognized on the Consolidated Balance Sheets | Gross Amounts Not Offset on the Consolidated Balance Sheets | Net
| (In thousands)
Assets: |  |  |
Commodity derivatives | $ | 11,244 |  | $ | (1,388 | ) | $ | 9,856 |
Total assets | $ | 11,244 |  | $ | (1,388 | ) | $ | 9,856 |
Liabilities: |  |  |
Commodity derivatives | $ | 1,388 |  | $ | (1,388 | ) | $ | — |
Total liabilities | $ | 1,388 |  | $ | (1,388 | ) | $ | — |
June 30, 2012 | Gross Amounts Recognized on the Consolidated Balance Sheets | Gross Amounts Not Offset on the Consolidated Balance Sheets | Net
| (In thousands)
Assets: |  |  |
Commodity derivatives | $ | 48,657 |  | $ | (809 | ) | $ | 47,848 |
Total assets | $ | 48,657 |  | $ | (809 | ) | $ | 47,848 |
Liabilities: |  |  |
Commodity derivatives | $ | 1,037 |  | $ | (809 | ) | $ | 228 |
Interest rate derivatives | 6,963 |  | — |  | 6,963 |
Total liabilities | $ | 8,000 |  | $ | (809 | ) | $ | 7,191 |
December 31, 2012 | Gross Amounts Recognized on the Consolidated Balance Sheets | Gross Amounts Not Offset on the Consolidated Balance Sheets | Net
| (In thousands)
Assets: |  |  |
Commodity derivatives | $ | 18,304 |  | $ | — |  | $ | 18,304 |
Total assets | $ | 18,304 |  | $ | — |  | $ | 18,304 |
Liabilities: |  |  |
Interest rate derivatives | $ | 6,255 |  | $ | — |  | $ | 6,255 |
Total liabilities | $ | 6,255 |  | $ | — |  | $ | 6,255 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + 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 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 Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624163-113959 + Details
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