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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Common Stock [Member]                      
Numerator [Abstract]                      
Distributed earnings                 $ 10,473 $ 27,674 $ 7,358
Undistributed earnings                 8,896 (1,869) 17,995
Basic                 19,369 25,805 25,353
Class A Common earnings                 1,706 2,551 2,436
Diluted                 $ 21,075 $ 28,356 $ 27,789
Denominator [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 19,381 19,492 20,430
Assumed conversion of Class A Common Stock (in shares)                 1,801 2,014 2,067
Dilutive options, awards and common stock equivalents (in shares)                 417 341 301
Total weighted average diluted Common Stock (in shares)                 21,599 21,847 22,798
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.14 $ 0.28 $ 0.29 $ 0.28 $ 0.52 $ 0.35 $ 0.25 $ 0.21 $ 1.00 $ 1.32 $ 1.24
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.13 0.28 0.29 0.28 0.51 0.34 0.24 0.21 $ 0.98 $ 1.30 $ 1.22
Class A Common Stock [Member]                      
Numerator [Abstract]                      
Distributed earnings                 $ 919 $ 2,735 $ 702
Undistributed earnings                 787 (184) 1,734
Class A Common earnings                 $ 1,706 $ 2,551 $ 2,436
Denominator [Abstract]                      
Weighted average shares outstanding (in shares)                 1,801 2,014 2,067
Basic net earnings per share [Abstract]                      
Common stock (in dollars per share) 0.13 0.27 0.28 0.27 0.50 0.33 0.24 0.20 $ 0.95 $ 1.27 $ 1.18
Diluted net earnings per share [Abstract]                      
Common stock (in dollars per share) $ 0.13 $ 0.27 $ 0.27 $ 0.27 $ 0.51 $ 0.33 $ 0.23 $ 0.20 $ 0.94 $ 1.27 $ 1.17