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DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments and Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Reported Value Measurement    
Accounting Policies [Line Items]    
Long-term debt instruments, excluding finance lease obligations $ 9,771,351 $ 9,599,610
Estimate of Fair Value Measurement    
Accounting Policies [Line Items]    
Long-term debt instruments, excluding finance lease obligations $ 9,802,804 $ 10,043,877