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NET INCOME PER COMMON SHARE AND EQUITY PER COMMON SHARE (Details) (USD $)
 2 Months Ended 12 Months Ended
Aug. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Aug. 15, 2011
Jul. 20, 2011
Shares used in computing basic and diluted net income per share [Abstract]            
Weighted average common shares outstanding during the period for Basic computation (in shares)   8,666,000 8,122,000 7,557,000    
Dilutive effect of employee stock options (in shares)   51,000 38,000 61,000    
Weighted average common shares outstanding during the period for Diluted computation (in shares)   8,717,000 8,160,000 7,618,000    
Common stock excluded from calculations of diluted net income per share (in shares)   60,750 234,000      
Class of Stock [Line Items]            
Equity per common share (in dollars per share)   $ 13.60 13.91 12.59    
Class A Stock [Member]
            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   15,000,000        
Common stock, shares issued (in shares)   7,828,836 7,729,506 6,755,654 84,000 804,290
Common stock, shares outstanding (in shares)   7,828,836 7,729,506 6,755,654    
Common stock, par value (in dollars per share)   $ 1.00        
Common stock, shares issued during period (in shares) 888,000 99,330 85,600 129,876    
Class B Stock [Member]
            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)   1,040,000        
Common stock, shares issued (in shares)   881,452 881,452 881,452    
Common stock, shares outstanding (in shares)   881,452 881,452 881,452    
Common stock, par value (in dollars per share)   $ 1.00