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BASIC AND DILUTED LOSS PER COMMON SHARE - Narrative (Details) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Antidilutive securities excluded from computation of earnings per share (in shares) 8,230 8,710 10,190