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INCOME TAXES (Rate Reconciliation) (Details) - USD ($) $ in Thousands	2 Months Ended		3 Months Ended								10 Months Ended		12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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													$ 17,721	$ 18,052	$ 9,901
Federal income tax effects of:
State income taxes													(840)	(992)	(357)
Nondeductible expenses													946	1,551	1,653
Life insurance proceeds and changes in cash surrender value													7	(927)	(1,001)
Alternative fuel tax credit													(1,203)		(1,180)
Increase (decrease) in valuation allowances													(891)	401	(61)
Increase (decrease) in uncertain tax positions													933	(720)
Settlement of share-based compensation													(649)	(1,129)
Impact of the Tax Reform Act on current tax													(52)	(1,288)
Impact of the Tax Reform Act on deferred tax													(3,772)	(24,542)
Other													(1,293)	(1,687)	(1,398)
Federal income tax provision (benefit)													10,907	(11,281)	7,557
State income tax provision													4,001	2,834	1,019
Foreign income tax provision													2,216	297	1,059
Total provision (benefit) for income taxes			$ 5,371	$ 13,215	$ (499)	$ (963)	$ (20,548)	$ 9,280	$ 8,358	$ (5,240)			$ 17,124	$ (8,150)	$ 9,635
Effective tax (benefit) rate (as a percent)													20.30%	(15.80%)	34.10%
Statutory federal rate (as a percent)	32.74%	35.00%									21.00%	32.74%	21.00%	35.00%	35.00%
Income taxes paid, excluding income tax refunds													$ 21,800	$ 22,700	$ 24,300
Income tax refunds													$ 18,500	$ 18,500	$ 32,500

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