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DEBT / INTEREST EXPENSE - Schedule of Derivative Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Derivative liability, current $ 9,080 $ 5,013
Derivative liability, noncurrent 1,730 1,927
Derivative liability $ 10,810 $ 6,940