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LONG-TERM DEBT - Schedule of Loss On Cash Flow Hedges (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Designated as Hedging Instrument | Interest rate swaps | Interest expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Other comprehensive loss, reclassification adjustment from AOCI $ (25) $ (53)