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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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													$ 10,809	$ 17,721	$ 18,052
Federal income tax effects of:
State income taxes													(637)	(840)	(992)
Nondeductible expenses													1,344	1,682	1,551
Life insurance proceeds and changes in cash surrender value													(775)	7	(927)
Alternative fuel tax credit													(2,340)	(1,203)
Net increase (decrease) in valuation allowances													382	(891)	401
Net increase (decrease) in uncertain tax positions													(20)	933	(720)
Settlement of share-based compensation													388	(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)
Nonunion pension termination expense													1,040
Foreign tax credits generated													(2,054)	(2,216)	(297)
Federal research and development tax credits													(1,354)
Other													(385)	187	(1,390)
Federal income tax provision (benefit)													6,398	10,907	(11,281)
State income tax provision													3,034	4,001	2,834
Foreign income tax provision													2,054	2,216	297
Total provision (benefit) for income taxes			$ (6,478)	$ 7,072	$ 9,184	$ 1,708	$ 5,371	$ 13,215	$ (499)	$ (963)			$ 11,486	$ 17,124	$ (8,150)
Effective tax (benefit) rate (as a percent)													22.30%	20.30%	(15.80%)
Statutory federal rate (as a percent)	32.74%	35.00%									21.00%	32.74%	21.00%	21.00%	35.00%
Income taxes paid, excluding income tax refunds													$ 28,100	$ 21,800	$ 22,700
Income tax refunds													$ 13,100	$ 18,500	$ 18,500

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