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INCOME TAXES (RateRec) (Details) - USD ($) $ in Thousands	2 Months Ended	3 Months Ended								10 Months Ended	12 Months Ended
	Feb. 28, 2017	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reconciliation between the effective income tax rate, as computed on income (loss) before income taxes, and the statutory federal income tax rate
Income tax provision at the statutory federal rate											$ 18,052	$ 9,901	$ 25,457
Federal income tax effects of:
State income taxes											(992)	(357)	(1,314)
Nondeductible expenses											1,551	1,653	1,426
Life insurance proceeds and changes in cash surrender value											(927)	(1,001)	(110)
Dividends received deduction											(9)	(11)	(3)
Alternative fuel tax credit												(1,180)	(1,141)
Decrease in valuation allowances											401	(61)	22
Increase (decrease) in uncertain tax positions											(720)
Adoption of ASC 718 relating to stock compensation											(1,129)
Impact of the Tax Reform Act on current tax											(1,288)
Impact of the Tax Reform Act on deferred tax											(24,542)
Other											(1,678)	(1,387)	(2,267)
Federal income tax provision (benefit)											(11,281)	7,557	22,070
State income tax provision											2,834	1,019	3,754
Foreign income tax provision											297	1,059	2,056
Total provision (benefit) for income taxes		$ (20,548)	$ 9,280	$ 8,358	$ (5,240)	$ (488)	$ 7,615	$ 6,150	$ (3,642)		$ (8,150)	$ 9,635	$ 27,880
Effective tax (benefit) rate (as a percent)											(15.80%)	34.10%	38.30%
Statutory federal rate (as a percent)	35.00%									32.74%	35.00%	35.00%	35.00%
Federal statutory tax rate used to calculate provisional effect of the Tax Reform Act in the period of enactment (as a percent)											21.00%
Income taxes paid, excluding income tax refunds											$ 22,700	$ 24,300	$ 39,000
Income tax refunds											$ 18,500	$ 32,500	$ 21,300

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