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EARNINGS PER SHARE (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Numerator [Abstract]                      
Net income $ 9,681 $ 9,494 $ 4,830 $ 8,260 $ 6,779 $ 3,314 $ 2,361 $ 2,457 $ 32,265 $ 14,911 $ 15,463
Diluted net earnings per share                      
Antidilutive shares excluded from the denominator due to the options' exercise prices being greater than the average market price (in shares)                   50,000 772,000
Common Stock [Member]
                      
Numerator [Abstract]                      
Distributed earnings                 4,787 21,721 2,244
Undistributed earnings (loss)                 23,972 (8,522) 11,005
Net income                 28,759 13,199 13,249
Class A Common earnings                 3,506 1,712 2,214
Diluted                 32,265 14,911 15,463
Denominator [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 19,865,000 19,096,000 18,633,000
Assumed conversion of Class A Common Stock (in shares)                 2,558,000 2,943,000 3,287,000
Dilutive options, awards and common stock equivalents (in shares)                 392,000 343,000 233,000
Total weighted-average diluted Common Stock (in shares)                 22,815,000 22,382,000 22,153,000
Basic net earnings per share                      
Common stock (in dollars per share) $ 0.43 $ 0.42 $ 0.22 $ 0.37 $ 0.31 $ 0.15 $ 0.11 $ 0.11 $ 1.45 $ 0.69 $ 0.71
Diluted net earnings per share                      
Common stock (in dollars per share) $ 0.42 $ 0.42 $ 0.21 $ 0.36 $ 0.30 $ 0.15 $ 0.11 $ 0.11 $ 1.41 $ 0.67 $ 0.70
Dividends paid (in dollars per share)         $ 1.00            
Class A Common Stock [Member]
                      
Numerator [Abstract]                      
Distributed earnings                 566 2,963 365
Undistributed earnings (loss)                 2,940 (1,251) 1,849
Net income                 $ 3,506 $ 1,712 $ 2,214
Denominator [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 2,558,000 2,943,000 3,287,000
Total weighted-average diluted Common Stock (in shares)                 2,558,000 2,943,000 3,287,000
Weighted average shares outstanding (in shares)                 2,558,000 2,943,000 3,287,000
Basic net earnings per share                      
Common stock (in dollars per share) $ 0.41 $ 0.40 $ 0.20 $ 0.35 $ 0.28 $ 0.14 $ 0.10 $ 0.11 $ 1.37 $ 0.58 $ 0.67
Diluted net earnings per share                      
Common stock (in dollars per share) $ 0.41 $ 0.40 $ 0.20 $ 0.34 $ 0.29 $ 0.14 $ 0.10 $ 0.11 $ 1.35 $ 0.59 $ 0.67
Dividends paid (in dollars per share)         $ 0.95