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DERIVATIVES AND FAIR VALUE MEASUREMENTS Table 4 (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Fair value, long-term debt $ 3,442,001 $ 3,056,704
Long-term debt, including current portion and excluding finance leases $ 3,331,839 $ 3,111,996