REVENUES (Freight & Delivery Revenues) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues		$ 1,240,197	$ 1,094,715	$ 3,294,822	$ 2,912,806
Freight & Delivery Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[1]	(175,194)	(143,664)	(476,491)	(397,934)
Total Revenues Excluding Freight & Delivery [Member]
Disaggregation of Revenue [Line Items]
Total revenues		$ 1,065,003	$ 951,051	$ 2,818,331	$ 2,514,872

[1] Includes freight & delivery to remote distribution sites