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Discontinued operations Disposal groups (Tables) | 9 Months Ended
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Sep. 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:
| September 30, 2015 |  | September 30, 2014 |  | December 31, 2014 |
| (In thousands)
Assets |  |  |
Current assets: |  |  |
Receivables, net | $ | 24,703 |  | $ | 117,098 |  | $ | 94,132 |
Inventories | 7,034 |  | 13,504 |  | 11,401 |
Commodity derivative instruments | 8,633 |  | 11,322 |  | 18,335 |
Prepayments and other current assets | 42,762 |  | 2,114 |  | 7,309 |
Total current assets held for sale | 83,132 |  | 144,038 |  | 131,177 |
Noncurrent assets: |  |  |
Investments | 37 |  | 37 |  | 37 |
Net property, plant and equipment | 1,114,285 |  | 1,609,385 |  | 1,618,099 |
Deferred income taxes | 141,556 |  | — |  | — |
Other | 162 |  | 2,635 |  | 2,334 |
Less allowance for impairment of assets held for sale | 756,127 |  | — |  | — |
Total noncurrent assets held for sale | 499,913 |  | 1,612,057 |  | 1,620,470 |
Total assets held for sale | $ | 583,045 |  | $ | 1,756,095 |  | $ | 1,751,647 |
Liabilities |  |  |
Current liabilities: |  |  |
Long-term debt due within one year | $ | — |  | $ | 528 |  | $ | 897 |
Accounts payable | 32,375 |  | 141,877 |  | 103,556 |
Taxes payable | 3,769 |  | 39,693 |  | 19,900 |
Deferred income taxes | 4,955 |  | 4,005 |  | 8,206 |
Accrued compensation | 5,982 |  | 6,622 |  | 5,373 |
Commodity derivative instruments | — |  | 44 |  | — |
Other accrued liabilities | 11,820 |  | 27,342 |  | 16,796 |
Total current liabilities held for sale | 58,901 |  | 220,111 |  | 154,728 |
Noncurrent liabilities: |  |  |
Long-term debt | — |  | 510 |  | — |
Deferred income taxes | — |  | 212,640 |  | 238,391 |
Other liabilities | 31,242 |  | 58,162 |  | 57,050 |
Total noncurrent liabilities held for sale | 31,242 |  | 271,312 |  | 295,441 |
Total liabilities held for sale | $ | 90,143 |  | $ | 491,423 |  | $ | 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 | Nine Months Ended
| September 30, | September 30,
| 2015 |  | 2014 |  | 2015 |  | 2014 |
| (In thousands)
Operating revenues | $ | 58,077 |  | $ | 155,807 |  | $ | 156,100 |  | $ | 432,922 |
Operating expenses | 378,361 |  | 97,982 |  | 1,394,039 |  | 299,290 |
Operating income (loss) | (320,284 | ) | 57,825 |  | (1,237,939 | ) | 133,632 |
Other income | 100 |  | 138 |  | 2,170 |  | 1,163 |
Interest expense | 174 |  | 23 |  | 229 |  | 80 |
Income (loss) from discontinued operations before income taxes | (320,358 | ) | 57,940 |  | (1,235,998 | ) | 134,715 |
Income taxes | (117,732 | ) | 19,458 |  | (457,351 | ) | 47,240 |
Income (loss) from discontinued operations | $ | (202,626 | ) | $ | 38,482 |  | $ | (778,647 | ) | $ | 87,475 |

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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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