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EARNINGS PER SHARE (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Numerator:          
Net income $ 17,796 $ 11,783 $ 21,986 $ 16,094  
Denominators:          
Unvested restricted stock (in shares) (2,000) (2,000) (2,000) (2,000)  
Effect of weighted average shares outstanding (in shares) (34,000) (18,000) (109,000) (111,000)  
Weighted average common shares outstanding, basic (in shares) 51,642,000 51,366,000 51,567,000 51,273,000  
Impact of potentially dilutive securities:          
Dilutive effect of stock options and other stock awards (in shares) 139,000 180,000 153,000 193,000  
Weighted average common shares outstanding, diluted 51,781,000 51,546,000 51,720,000 51,466,000  
Anti-dilutive potentially issuable shares (in shares) 70,000 0 70,000 48,000  
Class A Common Stock          
Denominators:          
Common stock, shares outstanding (in shares) 50,690,000 50,398,000 50,690,000 50,398,000 50,423,000
Class B Common Stock          
Denominators:          
Common stock, shares outstanding (in shares) 988,000 988,000 988,000 988,000 988,000