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LONG-TERM DEBT - Contractual Coupon Interest Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]      
Contractual coupon interest expense $ 0 $ 0 $ 470
Accretion of discount and fees on the liability component $ 0 $ 0 $ 461