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INCOME (LOSS) PER COMMON SHARE - Calculations of Basic and Diluted Loss per Common Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]    
Net income (loss) $ 3,067 $ (28,164)
Weighted-average shares outstanding - Basic (in shares) 21,086 20,745
Effect of dilutive securities:    
Weighted-average shares outstanding - Basic and Diluted (in shares) 21,771 20,745
Basic income (loss) per common share (usd per share) $ 0.15 $ (1.36)
Diluted income (loss) per common share (usd per share) $ 0.14 $ (1.36)
Antidilutive securities (in shares) 421 2,158
Stock options and other stock awards    
Effect of dilutive securities:    
Stock options and other stock awards (in shares) 685 0