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SHARE-BASED COMPENSATION (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Share-based compensation      
Number of shares authorized 2,200,000    
Restricted Stock Awards
      
Restricted stock activity      
Outstanding at the beginning of the period (in shares) 1,157,238    
Granted (in shares) 394,900 334,700 314,130
Vested (in shares) (261,709)    
Forfeited (in shares) (8,949)    
Outstanding at the end of the period (in shares) 1,281,480 1,157,238  
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share) $ 14.55 $ 22.49 $ 22.57
Other disclosure      
Fair value of stock vested $ 4,300,000 $ 3,900,000 $ 3,600,000
Unrecognized compensation cost 12,400,000    
Weighted-average period of recognition of unrecognized compensation cost 3 years    
Stock Options
      
Stock options activity      
Outstanding at the beginning of the period (in shares) 280,425    
Forfeited (in shares) (40,000)    
Outstanding at the end of the period (in shares) 240,425 280,425  
Weighted-Average Exercise Price      
Outstanding at the beginning of the period (in dollars per share) $ 27.29    
Forfeited (in dollars per share) $ 26.61    
Outstanding at the end of the period (in dollars per share) $ 27.40 $ 27.29  
Weighted-Average Remaining Contractual Term      
Options outstanding 8 months 12 days    
Intrinsic Value      
Options outstanding (in dollars) 0    
Additional activity related to Company's stock option program      
Intrinsic value of options exercised   79,000 415,000
Cash proceeds of options exercised   763,000 1,828,000
Tax benefit of options exercised   $ 30,000 $ 83,000