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INCOME TAXES (Deferred) (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, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets:
Accrued expenses			$ 39,885	$ 36,843	$ 39,885	$ 36,843
Pension liabilities			2,754	4,413	2,754	4,413
Multiemployer pension fund withdrawal			5,710		5,710
Postretirement liabilities other than pensions			7,660	6,236	7,660	6,236
Share-based compensation			4,893	4,466	4,893	4,466
Federal and state net operating loss carryforwards			1,152	1,781	1,152	1,781
Other			1,355	1,508	1,355	1,508
Total deferred tax assets			63,409	55,247	63,409	55,247
Valuation allowance			(53)	(844)	(53)	(844)
Total deferred tax assets, net of valuation allowance			63,356	54,403	63,356	54,403
Deferred tax liabilities:
Amortization, depreciation, and basis differences for property, plant and equipment, and other long-lived assets			93,525	73,725	93,525	73,725
Intangibles			14,066	14,573	14,066	14,573
Revenue recognition			1,513	6,172	1,513	6,172
Prepaid expenses			3,225	3,125	3,225	3,125
Total deferred tax liabilities			112,329	97,595	112,329	97,595
Net deferred tax liabilities			$ (48,973)	$ (43,192)	$ (48,973)	$ (43,192)
Statutory federal rate (as a percent)	32.74%	35.00%	21.00%	32.74%	21.00%	35.00%	35.00%

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