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EARNINGS PER SHARE (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Numerator:          
Net income $ 11,783 $ 12,113 $ 16,094 $ 13,072  
Denominators:          
Unvested restricted stock (in shares) (2,000) (1,000) (2,000) (1,000)  
Effect of weighted average shares outstanding (in shares) (18,000) (21,000) (111,000) (193,000)  
Weighted average common shares outstanding, basic 51,366,000 48,348,000 51,273,000 48,176,000  
Impact of potentially dilutive securities:          
Dilutive effect of stock options and other stock awards (in shares) 180,000 215,000 193,000 235,000  
Weighted average common shares outstanding, diluted 51,546,000 48,563,000 51,466,000 48,411,000  
Anti-dilutive potentially issuable shares 0 12,000 48,000 12,000  
Class A Common Stock          
Denominators:          
Common stock, shares outstanding 50,398,000 47,382,000 50,398,000 47,382,000 50,101,000
Class B Common Stock          
Denominators:          
Common stock, shares outstanding 988,000 988,000 988,000 988,000 988,000