INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 25, 2016
Deferred tax liabilities:
PP&E and identified intangible assets	$ 213,500	$ 242,991
Inventories	57,641	93,114
Insurance claims and losses	29,253	42,186
Business combinations	50,695	47,260
Other	18,519	7,938
Total deferred tax liabilities	369,608	433,489
Deferred tax assets:
Net operating losses	3,276	3,396
Foreign net operating losses	26,934	32,825
Credit carry forwards	2,425	2,080
Allowance for doubtful accounts	1,767	4,274
Accrued liabilities	50,389	57,567
Workers compensation	26,119	38,834
Pension and other postretirement benefits	13,379	21,903
Other	51,306	46,414
Total deferred tax assets	175,595	207,293
Valuation allowance	(14,479)	(25,611)
Net deferred tax assets	161,116	181,682
Net deferred tax liabilities	$ 208,492	$ 251,807