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LONG-TERM DEBT - Loss On Extinguishment of Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Debt And Derivatives Disclosure [Abstract]        
Loss on debt extinguishment $ 0 $ 0 $ 7,352 $ 517