REVENUES (Freight & Delivery Revenues) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	[1]	$ 1,322,575	$ 1,327,682	$ 2,371,817	$ 2,324,193
Freight & Delivery Revenues [Member]
Disaggregation of Revenue [Line Items]
Total revenues	[2]	(202,855)	(196,796)	(379,223)	(359,401)
Total Revenues Excluding Freight & Delivery [Member]
Disaggregation of Revenue [Line Items]
Total revenues		$ 1,119,720	$ 1,130,886	$ 1,992,594	$ 1,964,792

[1] ¹ The geographic markets are defined by states/countries as follows: East market — Arkansas, Delaware, Illinois, Kentucky, Maryland, North Carolina, Pennsylvania, Tennessee, Virginia, and Washington D.C. Gulf Coast market — Alabama, Florida, Georgia, Louisiana, Mexico, Mississippi, Oklahoma, South Carolina and Texas West market — Arizona, California and New Mexico

[2] Includes freight & delivery to remote distribution sites