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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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Numerator [Abstract]                      
Net income $ 6,779 $ 3,314 $ 2,361 $ 2,457 $ 16,958 $ 118 $ (942) $ (671) $ 14,911 $ 15,463 $ 8,444
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)                 50,000 772,000 878,000
Common Stock [Member]
                      
Numerator [Abstract]                      
Distributed earnings                 21,721 2,244 1,850
Undistributed earnings (loss)                 (8,522) 11,005 5,288
Net income                 13,199 13,249 7,138
Class A Common earnings                 1,712 2,214 1,306
Diluted                 14,911 15,463 8,444
Denominator [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 19,096,000 18,633,000 18,156,000
Assumed conversion of Class A Common Stock (in shares)                 2,943,000 3,287,000 3,563,000
Dilutive options, awards and common stock equivalents (in shares)                 343,000 233,000 251,000
Total weighted-average diluted Common Stock (in shares)                 22,382,000 22,153,000 21,970,000
Basic net earnings per share                      
Common stock (in dollars per share) $ 0.31 $ 0.15 $ 0.11 $ 0.11 $ 0.78 $ 0.01 $ (0.04) $ (0.03) $ 0.69 $ 0.71 $ 0.39
Diluted net earnings per share                      
Common stock (in dollars per share) $ 0.30 $ 0.15 $ 0.11 $ 0.11 $ 0.76 $ 0.01 $ (0.04) $ (0.03) $ 0.67 $ 0.70 $ 0.38
Dividends paid (in dollars per share) $ 1.00                    
Class A Common Stock [Member]
                      
Numerator [Abstract]                      
Distributed earnings                 2,963 365 318
Undistributed earnings (loss)                 (1,251) 1,849 988
Net income                 $ 1,712 $ 2,214 $ 1,306
Denominator [Abstract]                      
Weighted average shares outstanding - basic (in shares)                 2,943,000 3,287,000 3,563,000
Total weighted-average diluted Common Stock (in shares)                 2,943,000 3,287,000 3,563,000
Weighted average shares outstanding (in shares)                 2,943,000 3,287,000 3,563,000
Basic net earnings per share                      
Common stock (in dollars per share) $ 0.28 $ 0.14 $ 0.10 $ 0.11 $ 0.74 $ 0.01 $ (0.04) $ (0.03) $ 0.58 $ 0.67 $ 0.37
Diluted net earnings per share                      
Common stock (in dollars per share) $ 0.29 $ 0.14 $ 0.10 $ 0.11 $ 0.73 $ 0.01 $ (0.04) $ (0.03) $ 0.59 $ 0.67 $ 0.36
Dividends paid (in dollars per share) $ 0.95