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EARNINGS PER SHARE (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Numerator:      
Net income $ 4,311 $ 959  
Denominators:      
Shares to be issued - acquisition 0 36,000  
Unvested restricted stock (in shares) (2,000) (1,000)  
Effect of weighted average shares outstanding (in shares) (181,000) (338,000)  
Weighted average common shares outstanding, basic 51,179,000 48,005,000  
Impact of potentially dilutive securities:      
Dilutive effect of stock options and other stock awards (in shares) 208,000 257,000  
Weighted average common shares outstanding, diluted 51,387,000 48,262,000  
Anti-dilutive potentially issuable shares 88,000 0  
Class A Common Stock      
Denominators:      
Common stock, shares outstanding 50,374,000 47,320,000 50,101,000
Class B Common Stock      
Denominators:      
Common stock, shares outstanding 988,000 988,000 988,000