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STOCK-BASED COMPENSATION (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Integer
$ / shares
shares
Mar. 31, 2017
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense | $ $ (1,044,000)  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member]    
Weighted Average Grant Date Fair Value [Abstract]    
Equity Instruments other than options, number of plans | Integer 3  
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 78.18  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 5,406  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 78.18  
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%  
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 | $ $ 214,000 $ 486,000
Allocated Share-based Compensation Expense | $ $ 1,043,000 2,681,000
Shares withheld for tax obligations 23,824  
Fair value of shares vested as of the vesting date | $ $ 5,142,000  
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 78.18  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 21,097  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 78.18  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date 20.00%  
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) 20.00%  
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Individual performance awards [Member] | Executive Officer [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares $ 80.93  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 4,554  
Weighted Average Grant Date Fair Value [Abstract]    
Granted (per share) | $ / shares $ 80.93  
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date 20.00%  
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights 20.00%  
Award Recipient Type Employees and Directors [Member] | Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grant date fair value of shares issued (in dollars per share) | $ / shares [1] $ 76.56  
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) 152,926  
Granted (in shares) [1] 29,908  
Forfeited (in shares) 0  
Vested (in shares) (59,547)  
Unvested at end of period (in shares) 123,287  
Weighted Average Grant Date Fair Value [Abstract]    
Unvested at beginning of period (per share) | $ / shares $ 63.22  
Granted (per share) | $ / shares [1] 76.56  
Forfeited (per share) | $ / shares 0.00  
Vested (per share) | $ / shares 63.77  
Unvested at end of period (per share) | $ / shares $ 66.20  
Award Recipient Type Director [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Allocated Share-based Compensation Expense | $ $ 355,000 $ 162,000
One year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member]    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]    
Granted (in shares) 4,257  
Weighted Average Grant Date Fair Value [Abstract]    
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date 100.00%  
Number of years in total shareholder return performance period | Integer 1  
Two year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [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, Percent of future vesting that will occur on performance determination date 100.00%  
Number of years in total shareholder return performance period | Integer 2  
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) 9,460  
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [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, Percent of future vesting that will occur on performance determination 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) 18,917  
[1] (1) Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined.