SUPPLEMENTAL CASH FLOW INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]
Interest paid	$ 245,804	$ 225,842	$ 161,826
Income taxes paid	14,259	6,325	22,965
Cash paid for amounts included in measurement of liabilities:
Operating cash flows from operating leases	90,301	93,383	85,980
Right-of-use assets obtained in exchange for lease obligations:
Finance leases	14,298	21,749	15,324
Operating leases	124,872	96,810	114,990
Capital expenditures acquired but not yet paid	$ 108,675	$ 185,264	$ 298,425