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EARNINGS PER SHARE (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Numerator:          
Net income $ 12,113 $ 11,915 $ 13,072 $ 10,201  
Denominators:          
Shares to be issued - acquisition 0 36,000 0 36,000  
Unvested restricted stock (in shares) (1,000) (9,000) (1,000) (9,000)  
Effect of weighted average shares outstanding (in shares) (21,000) (150,000) (193,000) (921,000)  
Weighted average common shares outstanding, basic 48,348,000 47,464,000 48,176,000 46,693,000  
Impact of potentially dilutive securities:          
Dilutive effect of stock options and other stock awards (in shares) 215,000 757,000 235,000 731,000  
Weighted average common shares outstanding, diluted 48,563,000 48,221,000 48,411,000 47,424,000  
Anti-dilutive potentially issuable shares 12,000 0 12,000 154,000  
Class A Common Stock          
Denominators:          
Common stock, shares outstanding 47,382,000 46,599,000 47,382,000 46,599,000 46,803,000
Class B Common Stock          
Denominators:          
Common stock, shares outstanding 988,000 988,000 988,000 988,000 988,000