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STOCK-BASED COMPENSATION (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
Integer
$ / shares
shares
Mar. 31, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Payment Arrangement, Expense | $ $ (2,147,000) $ (1,781,000)
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Executive Officer [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) 118,911  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member] | 2020 Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 131.36  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 18,380  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 131.36  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 34.00%  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 33.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member] | 2021 Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 138.93  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 138.93  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 34.00%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) 19,052  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 33.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2018 Awards [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Equity Instruments other than options, number of plans | Integer 1  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2019 Awards [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Equity Instruments other than options, number of plans | Integer 1  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2020 Awards [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Equity Instruments other than options, number of plans | Integer 1  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2021 Awards    
Weighted Average Grant Date Fair Value [Abstract]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 75.00%  
Equity Instruments other than options, number of plans | Integer 1  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) 36,400  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 25.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Individual performance awards [Member] | Executive Officer [Member] | 2020 Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 142.89  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 4,156  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 142.89  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 34.00%  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 33.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Individual performance awards [Member] | Executive Officer [Member] | 2021 Awards    
Weighted Average Grant Date Fair Value [Abstract]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 34.00%  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) 4,756  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 33.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member] | 2018 Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 95.19  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 7,884  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 95.19  
Equity Instruments other than options, number of plans | Integer 1  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 25.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member] | 2019 Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent vested within a year of grant date 25.00%  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent that vested when number of shares determined 25.00%  
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 105.97  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 9,947  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 105.97  
Equity Instruments other than options, number of plans | Integer 1  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 25.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member] | 2020 Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 131.36  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 7,217  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 131.36  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 25.00%  
Equity Instruments other than options, number of plans | Integer 1  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 25.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member] | 2021 Awards    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent vested within a year of grant date 25.00%  
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 138.93  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 7,801  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 138.93  
Equity Instruments other than options, number of plans | Integer 1  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 25.00%  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Annual equity plan [Member] | Executive Officer [Member] | 2020 Awards [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Equity Instruments other than options, number of plans | Integer 2  
Award Recipient Type Employee [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock-based compensation costs capitalized as development costs | $ $ 550,000 555,000
Share-based Payment Arrangement, Expense | $ $ 2,144,000 1,779,000
Grant date fair value of shares issued (in dollars per share) | $ / shares [1],[2] $ 106.80  
Shares withheld for tax obligations 30,252  
Fair value of shares vested as of the vesting date | $ $ 10,322,000  
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) 113,403  
Granted (in shares) [1],[2] 57,423  
Forfeited (in shares) 0  
Vested (in shares) (73,692)  
Weighted Average Grant Date Fair Value [Abstract]    
Unvested at beginning of period (per share) | $ / shares $ 100.89  
Granted (per share) | $ / shares [1],[2] 106.80  
Forfeited (per share) | $ / shares 0  
Vested (per share) | $ / shares 91.59  
Unvested at end of period (per share) | $ / shares $ 111.44  
Award Recipient Type Director [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Payment Arrangement, Expense | $ $ 3,000 $ 2,000
Award Recipient Type Employees | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Unvested at end of period (in shares) 97,134  
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2018 Awards [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 75.00%  
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights 25.00%  
Number of years in total shareholder return performance period | Integer 3  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) 27,086  
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2019 Awards [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 75.00%  
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights 25.00%  
Number of years in total shareholder return performance period | Integer 3  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) 33,442  
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2020 Awards [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on performance determination date or future grant date 75.00%  
Number of years in total shareholder return performance period | Integer 3  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) 0  
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) 25,261  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 25.00%  
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2021 Awards    
Weighted Average Grant Date Fair Value [Abstract]    
Number of years in total shareholder return performance period | Integer 3  
[1] Does not include the restricted shares that may be earned if the performance goals established in 2019 and 2020 for long-term performance and in 2021 for annual and long-term performance are achieved. Depending on the actual level of achievement of the goals at the end of the open performance periods, the number of shares earned could range from zero to 118,911.
[2] Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined.