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Discontinued operations Disposal groups (Tables) | 6 Months Ended
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Jun. 30, 2015
Discontinued Operations and Disposal Groups [Abstract] |
Disposal Groups, Including Discontinued Operations [Table Text Block] | The carrying amounts of the major classes of assets and liabilities that are classified as held for sale on the Company's Consolidated Balance Sheets were as follows:
| June 30, 2015 | June 30, 2014 | December 31, 2014
| (In thousands)
ASSETS |  |  |
Current assets: |  |  |
Receivables, net | $ | 33,551 |  | $ | 146,589 |  | $ | 94,132 |
Inventories | 6,748 |  | 12,849 |  | 11,401 |
Deferred income taxes | — |  | 6,623 |  | — |
Commodity derivative instruments | 2,537 |  | 129 |  | 18,335 |
Prepayments and other current assets | 34,456 |  | 6,328 |  | 7,309 |
Total current assets held for sale | 77,292 |  | 172,518 |  | 131,177 |
Noncurrent assets: |  |  |
Investments | 37 |  | 37 |  | 37 |
Net property, plant and equipment | 1,097,576 |  | 1,753,509 |  | 1,618,099 |
Deferred income taxes | 52,017 |  | — |  | — |
Other | 161 |  | 4,091 |  | 2,334 |
Less allowance for impairment of assets held for sale | 399,987 |  | — |  | — |
Total noncurrent assets held for sale | 749,804 |  | 1,757,637 |  | 1,620,470 |
Total assets held for sale | $ | 827,096 |  | $ | 1,930,155 |  | $ | 1,751,647 |
LIABILITIES |  |  |
Current liabilities: |  |  |
Long-term debt due within one year | $ | — |  | $ | 569 |  | $ | 897 |
Accounts payable | 49,400 |  | 165,189 |  | 103,556 |
Taxes payable | 4,064 |  | 15,051 |  | 19,900 |
Deferred income taxes | 1,401 |  | — |  | 8,206 |
Accrued compensation | 4,460 |  | 5,721 |  | 5,373 |
Commodity derivative instruments | 3,511 |  | 17,449 |  | — |
Other accrued liabilities | 12,107 |  | 27,640 |  | 16,796 |
Total current liabilities held for sale | 74,943 |  | 231,619 |  | 154,728 |
Noncurrent liabilities: |  |  |
Long-term debt | — |  | 608 |  | — |
Deferred income taxes | — |  | 257,316 |  | 238,391 |
Other liabilities | 35,790 |  | 60,761 |  | 57,050 |
Total noncurrent liabilities held for sale | 35,790 |  | 318,685 |  | 295,441 |
Total liabilities held for sale | $ | 110,733 |  | $ | 550,304 |  | $ | 450,169 |
Reconciliation of Major Classes of Income And Expense [Table Text Block] | The reconciliation of the major classes of income and expense constituting pretax income (loss) from discontinued operations to the after-tax net income (loss) from discontinued operations on the Company's Consolidated Statements of Income were as follows:
| Three Months Ended | Six Months Ended
| June 30, | June 30,
| 2015 | 2014 | 2015 | 2014
| (In thousands)
Operating revenues | $ | 43,087 |  | $ | 139,580 |  | $ | 98,023 |  | $ | 277,115 |
Operating expenses | 442,725 |  | 103,057 |  | 1,015,677 |  | 201,307 |
Operating income (loss) | (399,638 | ) | 36,523 |  | (917,654 | ) | 75,808 |
Other income | 188 |  | 1,010 |  | 2,069 |  | 1,025 |
Interest expense | 33 |  | 31 |  | 55 |  | 57 |
Income (loss) from discontinued operations before income taxes | (399,483 | ) | 37,502 |  | (915,640 | ) | 76,776 |
Income taxes | (148,068 | ) | 13,621 |  | (339,620 | ) | 27,783 |
Income (loss) from discontinued operations | $ | (251,415 | ) | $ | 23,881 |  | $ | (576,020 | ) | $ | 48,993 |

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- Definition Tabular disclosure of information related to a disposal group. Includes, but is not limited to, a discontinued operation, disposal classified as held-for-sale or disposed of by means other than sale or disposal of an individually significant component. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721533-107759 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721665-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1474-107760 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721683-107760 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=51719941&loc=SL51724579-110230 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 4A -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721663-107760 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51719941&loc=d3e2941-110230 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5B -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721673-107760 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721659-107760 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5A -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721671-107760 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5D -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721677-107760 + Details
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