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STOCK-BASED COMPENSATION (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock Compensation Plan disclosure [Abstract]      
Stock-based compensation cost $ 4,447 $ 2,787 $ 2,042
Share awards granted (in shares) 111,732 [1] 79,491 [1] 135,704 [1]
Grant date fair value of shares issued (in dollars per share) $ 48.79 [1] $ 44.99 [1] $ 36.86 [1]
Restricted Stock Activity [Roll Forward]      
Unvested at beginning of year (in shares) 235,929 170,575 124,080
Granted (in shares) 111,732 [1] 79,491 [1] 135,704 [1]
Forfeited (in shares) 0 (233) 0
Vested (in shares) (135,455) (13,904) (89,209)
Unvested at end of year (in shares) 212,206 235,929 170,575
Restricted stock activity weighted average price [Abstract]      
Unvested at beginning of year (in dollars per share) $ 38.90 $ 36.29 $ 36.93
Granted (in dollars per share) $ 48.79 [1] $ 44.99 [1] $ 36.86 [1]
Forfeited (in dollars per share) $ 0.00 $ 35.85 $ 0.00
Vested (in dollars per share) $ 40.88 $ 41.77 $ 38.05
Unvested at end of year (in dollars per share) $ 42.84 $ 38.90 $ 36.29
Nonvested Shares Vesting Schedule [Abstract]      
Total Nonvested Shares (in shares) 212,206 235,929 170,575
Management Incentive Plan 2004 [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Authorized shares of common stock (in shares) 1,900,000    
Shares available for grant (in shares) 1,330,619 1,406,156 1,481,850
Stock-based compensation cost 4,087 2,486 1,801
Stock based compensation cost capitalized as development costs 920 304 43
Management Incentive Plan 2004 [Member] | Restricted Stock [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Unrecognized compensation cost related to nonvested restricted stock 7,293    
Compensation is recognized over a weighted average period (in years) 3 years 6 months 29 days    
Shares withheld to satisfy the tax obligations (in shares) 36,195 3,564 19,668
Fair value of shares granted 5,451 3,576 5,002
Fair value of shares vested as of the vesting date 6,630 613 3,591
Restricted Stock Activity [Roll Forward]      
Unvested at end of year (in shares) 212,206    
Nonvested Shares Vesting Schedule [Abstract]      
2013 (in shares) 9,366    
2014 (in shares) 55,440    
2015 (in shares) 59,111    
2016 (in shares) 24,587    
2017 (in shares) 15,702    
2018 (in shares) 12,000    
2019 (in shares) 16,200    
2020 (in shares) 19,800    
Total Nonvested Shares (in shares) 212,206    
Management Incentive Plan 2004 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officers [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Share awards granted (in shares) 44,789    
Grant date fair value of shares issued (in dollars per share) $ 48.75    
Percentage of initial share grant vesting (in hundredths) 20.00%    
Percentage of share grant vesting in current year (in hundredths) 20.00%    
Percentage of shares granted vesting annually in future periods (in hundredths) 20.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0    
Number of shares to be issued pursuant to the equity compensation plan for executive officers - maximum (in shares) 51,369    
Restricted Stock Activity [Roll Forward]      
Granted (in shares) 44,789    
Restricted stock activity weighted average price [Abstract]      
Granted (in dollars per share) $ 48.75    
Management Incentive Plan 2004 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officers [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Share awards granted (in shares) 47,418    
Grant date fair value of shares issued (in dollars per share) $ 48.75    
Percentage of initial share grant vesting (in hundredths) 25.00%    
Percentage of share grant vesting in current year (in hundredths) 25.00%    
Percentage of shares granted vesting annually in future periods (in hundredths) 25.00%    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0    
Number of shares to be issued pursuant to the equity compensation plan for executive officers - maximum (in shares) 54,335    
Restricted Stock Activity [Roll Forward]      
Granted (in shares) 47,418    
Restricted stock activity weighted average price [Abstract]      
Granted (in dollars per share) $ 48.75    
Management Incentive Plan 2004 [Member] | Restricted Stock [Member] | Continued Service Awards [Member] | Non-executive officers [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Share awards granted (in shares) 19,525    
Grant date fair value of shares issued (in dollars per share) $ 48.96    
Percentage of shares granted vesting annually in future periods (in hundredths) 20.00%    
Restricted Stock Activity [Roll Forward]      
Granted (in shares) 19,525    
Restricted stock activity weighted average price [Abstract]      
Granted (in dollars per share) $ 48.96    
Employee Stock Option [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Intrinsic value realized by employees or directors from the exercise of options   5 74
Stock Options [Roll Forward]      
Outstanding at beginning of year (in shares) 0 250 4,750
Exercised (in shares) 0 (250) (4,500)
Outstanding at end of year (in shares) 0 0 250
Exercisable at end of year (in shares) 0 0 250
Stock Options weighted average price [Abstract]      
Outstanding at beginning of year (in dollars per share) $ 0.00 $ 25.30 $ 21.80
Exercised (in dollars per share) $ 0.00 $ 25.30 $ 21.61
Outstanding at end of year (in dollars per share) $ 0.00 $ 0.00 $ 25.30
Stock options exercisable [Abstract]      
Exercisable at end of year (in dollars per share) $ 0.00 $ 0.00 $ 25.30
Directors Equity Plan 2005 [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Authorized shares of common stock (in shares) 50,000    
Shares available for grant (in shares) 9,127    
Stock-based compensation cost 330 270 240
Shares issued to directors (in shares) 7,326 6,618 6,690
Directors Equity Plan 2005 [Member] | Stock Options [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Intrinsic value realized by employees or directors from the exercise of options 116 183 208
Stock Options [Roll Forward]      
Outstanding at beginning of year (in shares) 9,000 18,000 31,500
Exercised (in shares) (4,500) (9,000) (13,500)
Outstanding at end of year (in shares) 4,500 9,000 18,000
Exercisable at end of year (in shares) 4,500 9,000 18,000
Stock Options weighted average price [Abstract]      
Outstanding at beginning of year (in dollars per share) $ 25.31 $ 24.33 $ 23.65
Exercised (in dollars per share) $ 24.02 $ 23.36 $ 22.74
Outstanding at end of year (in dollars per share) $ 26.60 $ 25.31 $ 24.33
Stock options exercisable [Abstract]      
Exercisable at end of year (in dollars per share) $ 26.60 $ 25.31 $ 24.33
Exercise price range, minimum (in dollars per share) $ 26.6    
Exercise price range, maximum (in dollars per share) $ 26.6    
Weighted Average Remaining Contractual Life (in years) 4 months 24 days    
Intrinsic Value $ 122    
Minimum [Member] | Management Incentive Plan 2004 [Member] | Restricted Stock [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Vesting period (in years) 2 years 6 months    
Maximum [Member] | Management Incentive Plan 2004 [Member] | Restricted Stock [Member]
     
Stock Compensation Plan disclosure [Abstract]      
Vesting period (in years) 9 years    
[1] Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined.