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EQUITY (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Stock options
Dec. 31, 2011
Stock options
Dec. 31, 2010
Stock options
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2010
Restricted Stock
Dec. 31, 2012
Share Based Plans
Stock options
Dec. 31, 2011
Share Based Plans
Stock options
Dec. 31, 2010
Share Based Plans
Stock options
Dec. 31, 2012
Share Based Plans
Restricted Stock
Dec. 31, 2011
2008 Plan
May 31, 2008
2008 Plan
Treasury Stock                              
Shares reissued from treasury under Director's Remuneration Plan     790                        
Number of shares of common stock repurchased 9,175 5,470 1,331                        
Cost of repurchased shares $ 344,000 $ 218,000 $ 44,000                        
Average price of shares repurchased (in dollars per share) $ 37.51 $ 39.90 $ 33.00                        
Stock-based compensation                              
Number of shares reserved to be granted under the plan                           2,000,000 1,500,000
Expiration term, one                   7 years          
Expiration term, two                   10 years          
Vesting period       4 years     4 years     4 years     4 years    
Number of Options                              
Outstanding at the beginning of the period (in shares)                   720,648 625,750        
Granted (in shares)       64,000 146,500 172,500       64,000 146,500 172,500      
Forfeited (in shares)                   (1,625)          
Exercised (in shares) (62,575) (51,602) (85,500)             (62,575) (51,602)        
Outstanding at the end of the period (in shares)                   720,448 720,648 625,750      
Vested and expected to vest at the end of the period (in shares)                   713,728 674,469        
Exercisable at the end of the period (in shares)                   453,698 409,149        
Weighted Avg. Exercise Price                              
Outstanding at the beginning of the period (in dollars per share)                   $ 33.07 $ 32.17        
Granted (in dollars per share)                   $ 37.36 $ 33.29        
Forfeited (in dollars per share)                   $ 32.02          
Exercised (in dollars per share)                   $ 23.22 $ 22.77        
Outstanding at the end of the period (in dollars per share)                   $ 34.31 $ 33.07 $ 32.17      
Vested and expected to vest at the end of the period (in dollars per share)                   $ 34.28 $ 32.74        
Exercisable at the end of the period (in dollars per share)                   $ 32.02 $ 29.44        
Weighted Average Remaining Contractual Term                              
Outstanding                   6 years 3 months 29 days 6 years 9 months 14 days        
Vested and expected to vest                   6 years 3 months 22 days 6 years 7 months 28 days        
Exercisable                   5 years 3 months 7 days 5 years 4 months 28 days        
Aggregate Intrinsic Value                              
Outstanding                   3,499,252 5,617,669        
Vested and expected to vest                   3,488,633 5,248,211        
Exercisable                   2,987,705 4,259,541        
Unamortized stock based compensation                              
Unamortized stock based compensation       2,800,000     3,000,000                
Weighted-average period for recognition of unamortized stock-based compensation cost       2 years 2 months 12 days     2 years 7 months 6 days                
Stock-based compensation, additional disclosures                              
Weighted-average of fair value of options granted (in dollars per share) $ 15.27 $ 13.18 $ 18.26                        
Aggregate intrinsic value of options exercised 938,000 822,000 2,141,000                        
Cash proceeds received upon exercise of options 1,452,000 1,175,000 1,653,000                        
Tax benefits realized upon exercise of options 362,000   594,000                        
Weighted-average assumptions using Black-Scholes option-pricing model for estimating fair value of each option granted                              
Risk-free interest rate (as a percent) 1.40% 2.10% 2.50%                        
Expected dividend yield (as a percent) 2.50% 2.70% 2.50%                        
Expected life 6 years 3 months 6 years 3 months 6 years 3 months                        
Expected volatility (as a percent) 53.00% 51.00% 50.00%                        
Stock compensation expense                              
Stock compensation expense       $ 1,600,000 $ 1,600,000 $ 1,100,000 $ 1,900,000 $ 1,200,000 $ 900,000            
Shares                              
Unvested at the beginning of the period (in shares)             68,773 76,287              
Granted (in shares)             72,083 22,925 64,477            
Forfeited (in shares)             (1,499)                
Vested and issued (in shares)             (35,504) (30,439)              
Unvested at the end of the period (in shares)             103,853 68,773 76,287            
Weighted Avg. Fair Value                              
Unvested at the beginning of the period (in dollars per share)             $ 41.39 $ 42.10              
Granted (in dollars per share)             $ 36.93 $ 34.64              
Forfeited (in dollars per share)             $ 38.60                
Vested and issued (in dollars per share)             $ 37.58 $ 38.21              
Unvested at the end of the period (in dollars per share)             $ 39.63 $ 41.39 $ 42.10