FAIR VALUE MEASUREMENTS - SCHEDULE OF FAIR VALUES AND CARRYING VALUES OF LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of long-term debt	$ 438,829	$ 703,390
Long-term portion	4,089,755	3,530,813
Total long-term debt, carrying value	4,528,584	4,234,203
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of long-term debt, fair value	443,215	712,863
Long-term debt, fair value	4,479,499	3,656,540
Total long-term debt, fair value	4,922,714	4,369,403
Current portion of long-term debt	438,829	703,390
Long-term portion	4,089,755	3,530,813
Total long-term debt, carrying value	$ 4,528,584	$ 4,234,203