INCOME TAXES (restated) (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Goodwill and other intangibles	$ 4,165	$ 6,747
Receivables	1,705	988
Inventory	4,114	4,264
Accrued insurance	5,170	4,021
Depletion	366	490
Deferred revenue	358	332
Stock compensation	769	986
Charitable contribution carryover	0	166
Other accrued expenses	7,465	5,224
Capital loss carryforward expiration	0	3,736
Net operating loss carryforwards	5,699	10,039
Other	2,024	1,507
Total gross deferred tax assets	31,835	38,500
Valuation allowance	(4,131)	(26,474)
Net deferred tax assets	27,704	12,026
Deferred income tax liabilities:
Property, plant and equipment, net	21,678	16,566
Total gross deferred tax liabilities	21,678	16,566
Net deferred tax asset	$ 6,026
Net deferred tax liability		$ (4,540)