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SHARE-BASED COMPENSATION (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Pretax stock based compensation cost $ 1,767,000 $ 1,709,000 $ 2,200,000
Percentage of increments earned for share awards (in hundredths) 25.00%    
Amortization period for market value of common stock awarded 5 years    
Restricted Stock [Member]
     
Shares [Roll Forward]      
Outstanding (in shares) 321,525    
Granted (in shares) 130,000    
Vested (in shares) (74,175)    
Forfeited (in shares) (24,750)    
Outstanding (in shares) 352,600    
Weighted Average Award Price [Roll Forward]      
Outstanding (in dollars per share) $ 20.48    
Granted (in dollars per share) $ 17.70    
Vested (in dollars per share) $ 23.81    
Forfeited (in dollars per share) $ 19.40    
Outstanding (in dollars per share) $ 18.83    
Weighted Average Remaining Contractual Term [Abstract]      
Outstanding 3 years 3 months 18 days    
Outstanding 3 years    
Pretax unrecognized compensation cost $ 4,500,000    
Period over which compensation cost is expected to be recognized 4 years 8 months 12 days    
Restricted Stock [Member] | Common Class B [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares issued (in shares) 130,000 128,300 68,900
2002 Equity Compensation Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized under the plan (in shares) 2,400,000    
2011 Equity Compensation Plan [Member] | Common Class B [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized under the plan (in shares) 1,400,000    
Common shares available for future issuance (in shares) 1,300,000