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INCOME TAXES (Tables) | 9 Months Ended
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Sep. 30, 2018
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation | The reconciliation of income tax expense with federal income taxes at statutory rate follows (in thousands of dollars):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Federal income tax (21% in 2018 and 35% in 2017) | $ | 35,914 |  |  | $ | 87,499 |  |  | $ | 168,288 |  |  | $ | 254,753 |
States income taxes, net of federal income tax benefit | 4,817 |  |  | 5,996 |  |  | 22,572 |  |  | 17,458 |
Clean energy credit | (2,897 | ) |  | (8,902 | ) |  | (13,575 | ) |  | (25,917 | )
Foreign rate difference | 1,895 |  |  | 2,152 |  |  | 8,880 |  |  | 6,265 |
Impairment and other charges | 27,875 |  |  | — |  |  | 27,875 |  |  | 19,188 |
Stock compensation benefit | (8,289 | ) |  | (575 | ) |  | (18,899 | ) |  | (8,314 | )
Other, net | (3,343 | ) |  | (6,988 | ) |  | 2,657 |  |  | 3,806 |
Income tax expense | $ | 55,972 |  |  | $ | 79,182 |  |  | $ | 197,798 |  |  | $ | 267,239 |
Effective tax rate | 32.7 | % |  | 31.7 | % |  | 24.7 | % |  | 36.7 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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