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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Numerator [Abstract]                      
Net income $ 10,947 $ 7,336 $ 5,374 $ 4,669 $ 9,181 $ 7,655 $ 4,833 $ 6,119 $ 28,356 $ 27,789 $ 8,589
Common Stock [Member]                      
Numerator [Abstract]                      
Distributed earnings                 27,674 7,358 27,077
Undistributed earnings                 (1,869) 17,995 (19,220)
Basic                 25,805 25,353 7,857
Net income                 2,551 2,436 732
Diluted                 $ 28,356 $ 27,789 $ 8,589
Denominator [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 19,492 20,430 20,426
Assumed conversion of Class A Common Stock (in shares)                 2,014 2,067 2,199
Dilutive options, awards and common stock equivalents (in shares)                 341 301 315
Total weighted average diluted Common Stock (in shares)                 21,847 22,798 22,940
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.52 $ 0.35 $ 0.25 $ 0.21 $ 0.42 $ 0.34 $ 0.21 $ 0.27 $ 1.32 $ 1.24 $ 0.38
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.51 0.34 0.24 0.21 0.41 0.34 0.21 0.27 $ 1.30 $ 1.22 $ 0.37
Class A Common Stock [Member]                      
Numerator [Abstract]                      
Distributed earnings                 $ 2,735 $ 702 $ 2,703
Undistributed earnings                 (184) 1,734 (1,971)
Net income                 $ 2,551 $ 2,436 $ 732
Denominator [Abstract]                      
Weighted average shares outstanding (in shares)                 2,014 2,067 2,199
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.50 0.33 0.24 0.20 0.40 0.32 0.20 0.26 $ 1.27 $ 1.18 $ 0.33
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.51 $ 0.33 $ 0.23 $ 0.20 $ 0.39 $ 0.32 $ 0.20 $ 0.25 $ 1.27 $ 1.17 $ 0.33