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INCOME TAXES INCOME TAXES - Reconciliation of Income Tax Expense with Federal Income Taxes at the Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Tax Disclosure [Abstract]
Federal income tax (21% in 2018 and 35% in 2017)	$ 35,914	$ 87,499	$ 168,288	$ 254,753
State 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	0	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	32.70%	31.70%	24.70%	36.70%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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