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INCOME TAXES (Deferred income taxes) (Details) - USD ($) $ in Thousands	2 Months Ended		10 Months Ended		12 Months Ended
	Feb. 28, 2018	Feb. 28, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components of the deferred tax provision or benefit
Amortization, depreciation, and basis differences for property, plant and equipment and other long-lived assets					$ 16,255	$ 23,153	$ 21,876
Amortization of intangibles and impairment					(6,933)	(763)	(1,030)
Changes in reserves for workers' compensation, third-party casualty, and cargo claims					(1,880)	469	(812)
Revenue recognition					(1,437)	(2,524)	332
Allowance for doubtful accounts					541	(115)	(719)
Nonunion pension and other retirement plans					564	(2,810)	(1,977)
Multiemployer pension fund withdrawal					150	(5,818)
Federal and state net operating loss carryforwards utilized					59	746	257
State depreciation adjustments					(1,302)	(1,761)	(1,244)
Share-based compensation					(709)	(529)	352
Valuation allowance increase (decrease)					383	(744)	401
Other accrued expenses					(699)	(4,881)	(852)
Impact of the Tax Reform Act						(3,772)	(24,542)
Prepaid expenses					1,782	1,313	(1,331)
Operating lease right-of-use assets/liabilities - net					(1,049)
Other					(314)	(92)	(924)
Deferred tax provision (benefit)					$ 5,411	$ 1,872	$ (10,213)
Statutory federal rate (as a percent)	32.74%	35.00%	21.00%	32.74%	21.00%	21.00%	35.00%

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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