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STOCK-BASED COMPENSATION (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense $ (1,831,000)  
Grant date fair value of shares issued (in dollars per share) $ 57.10  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested at beginning of period (in shares) 212,206  
Granted (in shares) 91,149  
Forfeited (in shares) 0  
Vested (in shares) (30,316)  
Unvested at end of period (in shares) 273,039  
Weighted Average Grant Date Fair Value [Abstract]    
Unvested at beginning of period (per share) $ 42.84  
Granted (per share) $ 57.10  
Forfeited (per share) $ 0.00  
Vested (per share) $ 52.32  
Unvested at end of period (per share) $ 46.55  
Management Incentive Plan 2004 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Authorized shares of common stock 1,900,000  
Shares available for grant 1,248,882  
Stock-based compensation costs capitalized as development costs 551,000 233,000
Allocated Share-based Compensation Expense 1,831,000 1,492,000
Management Incentive Plan 2004 [Member] | Restricted Stock [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares withheld for tax obligations 17,927  
Fair value of shares vested as of the vesting date 1,700,000  
Management Incentive Plan 2004 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of shares vested within current year 20.00%  
Percentage of shares granted vesting annually in future periods 20.00%  
Grant date fair value of shares issued (in dollars per share) $ 57.10  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 36,813  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) $ 57.10  
Management Incentive Plan 2004 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of shares vested within current year 25.00%  
Percentage of shares granted vesting annually in future periods 25.00%  
Grant date fair value of shares issued (in dollars per share) $ 57.11  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 54,336  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) $ 57.11  
Directors Equity Plan 2005 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Authorized shares of common stock 50,000  
Shares available for grant 9,127  
Allocated Share-based Compensation Expense $ 90,000 $ 75,000
Equity Incentive Plan 2013 [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Authorized shares of common stock 2,000,000