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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Numerator [Abstract]                      
Net income $ 9,181 $ 7,655 $ 4,833 $ 6,119 $ (10,192) $ 7,824 $ 4,829 $ 6,129 $ 27,789 $ 8,589 $ 32,265
Common Stock [Member]                      
Numerator [Abstract]                      
Distributed earnings                 7,358 27,077 4,787
Undistributed earnings                 17,995 (19,220) 23,972
Basic                 25,353 7,857 28,759
Class A Common earnings                 2,436 732 3,506
Diluted                 $ 27,789 $ 8,589 $ 32,265
Denominator [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 20,430 20,426 19,865
Assumed conversion of Class A Common Stock (in shares)                 2,067 2,199 2,558
Dilutive options, awards and common stock equivalents (in shares)                 301 315 392
Total weighted average diluted Common Stock (in shares)                 22,798 22,940 22,815
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.42 $ 0.34 $ 0.21 $ 0.27 $ (0.45) $ 0.35 $ 0.21 $ 0.27 $ 1.24 $ 0.38 $ 1.45
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.41 0.34 0.21 0.27 (0.45) 0.34 0.21 0.27 $ 1.22 $ 0.37 $ 1.41
Class A Common Stock [Member]                      
Numerator [Abstract]                      
Distributed earnings                 $ 702 $ 2,703 $ 566
Undistributed earnings                 1,734 (1,971) 2,940
Net income                 $ 2,436 $ 732 $ 3,506
Denominator [Abstract]                      
Weighted average shares outstanding (in shares)                 2,067 2,199 2,558
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.40 0.32 0.20 0.26 (0.43) 0.33 0.20 0.26 $ 1.18 $ 0.33 $ 1.37
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.39 $ 0.32 $ 0.20 $ 0.25 $ (0.43) $ 0.33 $ 0.20 $ 0.26 $ 1.17 $ 0.33 $ 1.35