ACCRUED EXPENSES (Schedule of Accrued Expenses) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Payables and Accruals [Abstract]
Accrued insurance	$ 77,514	$ 74,376
Accrued interest	19,697	21,222
Accrued compensation and benefits	81,437	72,473
Accrued income, real estate, sales and other taxes	25,843	35,749
Interest rate swap liability	33,630	20,840
Accrued other	57,702	51,880
Total accrued expenses	$ 295,823	$ 276,540