FAIR VALUE MEASUREMENTS - SCHEDULE OF FAIR VALUES AND CARRYING VALUES OF LONG-TERM DEBT (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of long-term debt	$ 5,387	$ 300,098
Long-term portion	3,254,280	2,061,023
Long-term Debt	3,259,667	2,361,121
Significant other observable inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term Debt, Current Maturities, Fair Value	5,387	299,430
Long-term Debt, Excluding Current Maturities, Fair Value	3,228,877	2,113,296
Long-term Debt, Fair Value	3,234,264	2,412,726
Current portion of long-term debt	5,387	300,098
Long-term portion	3,254,280	2,061,023
Long-term Debt	$ 3,259,667	$ 2,361,121