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INCOME TAXES (Tables)

9 Months Ended

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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- References

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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

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