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Derivative instruments (Tables) | 3 Months Ended
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Mar. 31, 2014
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
| March 31,
| 2014 | 2013
| (In thousands)
Commodity derivatives designated as cash flow hedges: |  |
Amount of loss recognized in accumulated other comprehensive loss (effective portion), net of tax | $ | — |  | $ | (6,154 | )
Amount of (gain) loss reclassified from accumulated other comprehensive loss into operating revenues (effective portion), net of tax | 244 |  | (2,843 | )
Amount of loss recognized in operating revenues (ineffective portion), before tax | — |  | (1,422 | )
Interest rate derivatives designated as cash flow hedges: |  |
Amount of gain recognized in accumulated other comprehensive loss (effective portion), net of tax | — |  | 305 |
Amount of loss reclassified from accumulated other comprehensive loss into interest expense (effective portion), net of tax | 100 |  | 71 |
Amount of loss recognized in interest expense (ineffective portion), before tax | — |  | (159 | )
Commodity derivatives not designated as hedging instruments: |  |
Amount of loss recognized in operating revenues, before tax | (6,712 | ) | (4,410 | )
Derivative instruments | 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 March 31, 2014 | Fair Value at March 31, 2013 | Fair Value at December 31, 2013
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | — |  | $ | 1,623 |  | $ | — |
|  | — |  | 1,623 |  | — |
Not designated as hedges: |  |  |  |
Commodity derivatives | Commodity derivative instruments | 81 |  | 4,313 |  | 1,447 |
| Other assets - noncurrent | 249 |  | 243 |  | 503 |
|  | 330 |  | 4,556 |  | 1,950 |
Total asset derivatives |  | $ | 330 |  | $ | 6,179 |  | $ | 1,950 |
Liability Derivatives | Location on Consolidated Balance Sheets | Fair Value at March 31, 2014 | Fair Value at March 31, 2013 | Fair Value at December 31, 2013
|  | (In thousands)
Designated as hedges: |  |  |
Commodity derivatives | Commodity derivative instruments | $ | — |  | $ | 5,994 |  | $ | — |
| Other liabilities - noncurrent | — |  | 534 |  | — |
Interest rate derivatives | Other accrued liabilities | — |  | 4,458 |  | — |
|  | — |  | 10,986 |  | — |
Not designated as hedges: |  |  |  |  |  |
Commodity derivatives | Commodity derivative instruments | 12,186 |  | 1,385 |  | 7,483 |
| Other liabilities - noncurrent | — |  | 74 |  | — |
|  | 12,186 |  | 1,459 |  | 7,483 |
Total liability derivatives |  | $ | 12,186 |  | $ | 12,445 |  | $ | 7,483 |
Offsetting assets and liabilities master netting | 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:
March 31, 2014 | Gross Amounts Recognized on the Consolidated Balance Sheets | Gross Amounts Not Offset on the Consolidated Balance Sheets | Net
| (In thousands)
Assets: |  |  |
Commodity derivatives | $ | 330 |  | $ | (330 | ) | $ | — |
Total assets | $ | 330 |  | $ | (330 | ) | $ | — |
Liabilities: |  |  |
Commodity derivatives | $ | 12,186 |  | $ | (330 | ) | $ | 11,856 |
Total liabilities | $ | 12,186 |  | $ | (330 | ) | $ | 11,856 |
March 31, 2013 | Gross Amounts Recognized on the Consolidated Balance Sheets | Gross Amounts Not Offset on the Consolidated Balance Sheets | Net
| (In thousands)
Assets: |  |  |
Commodity derivatives | $ | 6,179 |  | $ | (3,578 | ) | $ | 2,601 |
Total assets | $ | 6,179 |  | $ | (3,578 | ) | $ | 2,601 |
Liabilities: |  |  |
Commodity derivatives | $ | 7,987 |  | $ | (3,578 | ) | $ | 4,409 |
Interest rate derivatives | 4,458 |  | — |  | 4,458 |
Total liabilities | $ | 12,445 |  | $ | (3,578 | ) | $ | 8,867 |
December 31, 2013 | Gross Amounts Recognized on the Consolidated Balance Sheets | Gross Amounts Not Offset on the Consolidated Balance Sheets | Net
| (In thousands)
Assets: |  |  |
Commodity derivatives | $ | 1,950 |  | $ | (1,950 | ) | $ | — |
Total assets | $ | 1,950 |  | $ | (1,950 | ) | $ | — |
Liabilities: |  |  |
Commodity derivatives | $ | 7,483 |  | $ | (1,950 | ) | $ | 5,533 |
Total liabilities | $ | 7,483 |  | $ | (1,950 | ) | $ | 5,533 |

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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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