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STOCK-BASED COMPENSATION (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 USD ($) $ / shares shares | Jun. 30, 2019 USD ($) $ / shares shares | Mar. 31, 2019 USD ($) $ / shares shares | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Sep. 30, 2019 USD ($) Integer $ / shares shares | Sep. 30, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  | $ (1,739,000) | $ (2,291,000) | $ (1,447,000) | $ (1,574,000) | $ (1,885,000) | $ (1,044,000) |  |
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) |  |  |  |  |  |  |  | 113,305 |
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] | 2017 Awards [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] | 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] | Individual performance 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 |  |  |  |  |  |  |  | 20.00% |
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) |  |  |  |  |  |  |  | 6,394 |
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) |  |  |  |  |  |  |  | 20.00% |
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] | 2017 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 |  |  |  |  |  |  |  | $ 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% |
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] |  |  |  |  |  |  |  |  |
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 |
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] | Annual equity plan [Member] | Executive Officer [Member] | 2019 Awards [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] | Company Performance Awards - Part A [Member] | Executive Officer [Member] | 2019 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 |  |  |  |  |  |  |  | $ 105.97 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |  |
Granted (per share) | $ / shares |  |  |  |  |  |  |  | $ 105.97 |
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 |  |  |  |  |  |  |  | 20.00% |
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) |  |  |  |  |  |  |  | 9,594 |
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) |  |  |  |  |  |  |  | 20.00% |
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards - Part B [Member] | Executive Officer [Member] | 2019 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 |  |  |  |  |  |  |  | $ 122.61 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |  |
Granted (per share) | $ / shares |  |  |  |  |  |  |  | $ 122.61 |
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 |  |  |  |  |  |  |  | 20.00% |
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) |  |  |  |  |  |  |  | 15,992 |
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] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Stock-based compensation costs capitalized as development costs | $ |  | 523,000 |  |  | 365,000 |  |  | $ 1,300,000 | $ 824,000
Share-based Payment Arrangement, Expense | $ |  | $ 1,739,000 |  |  | 1,574,000 |  |  | $ 4,752,000 | 3,725,000
Shares withheld for tax obligations |  |  |  |  |  |  |  | 28,955 |
Fair value of shares vested as of the vesting date | $ |  |  |  |  |  |  |  | $ 6,671,000 |
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Non Executive Officers [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 112.14 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 10,175 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |  |
Granted (per share) | $ / shares |  |  |  |  |  |  |  | $ 112.14 |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 20.00% |
Award Recipient Type Employee [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance 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) |  |  |  |  |  |  |  | 24,690 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |  |
Granted (per share) | $ / shares |  |  |  |  |  |  |  | $ 95.19 |
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] | 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 |  |  |  |  |  |  |  | $ 107.37 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 5,671 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |  |
Granted (per share) | $ / shares |  |  |  |  |  |  |  | $ 107.37 |
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, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 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],[2] | $ 0 |  |  |  |  |  | $ 94.62 |
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) |  | 131,095 |  | 143,525 |  |  |  | 143,525 |
Granted (in shares) | [1],[2] | 0 |  |  |  |  |  | 59,943 |
Forfeited (in shares) |  | 0 |  |  |  |  |  | (3,010) |
Vested (in shares) |  | (71) |  |  |  |  |  | (69,434) |
Unvested at end of period (in shares) |  | 131,024 | 131,095 |  |  |  |  | 131,024 |
Weighted Average Grant Date Fair Value [Abstract] |  |  |  |  |  |  |  |  |
Unvested at beginning of period (per share) | $ / shares |  | $ 82.79 |  | $ 70.29 |  |  |  | $ 70.29 |
Granted (per share) | $ / shares | [1],[2] | 0 |  |  |  |  |  | 94.62 |
Forfeited (per share) | $ / shares |  | 0 |  |  |  |  |  | 86.19 |
Vested (per share) | $ / shares |  | 88.86 |  |  |  |  |  | 67.01 |
Unvested at end of period (per share) | $ / shares |  | $ 82.79 | $ 82.79 |  |  |  |  | $ 82.79 |
Award Recipient Type Director [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  | $ 1,000 |  |  | $ 1,000 |  |  | $ 725,000 | $ 1,132,000
Two year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2017 Awards [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  | 9,460 |
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 |  |  |  |  |  |  |  | 2 |
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 (minimum) |  |  |  |  |  |  |  | 0 |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  |  |  |  |  |  | 27,596 |
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] | 2017 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) |  |  |  |  |  |  |  | 18,917 |
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) |  |  |  |  |  |  |  | 34,812 |
[1] | Does not include the restricted shares that may be earned if the performance goals established in 2017 and 2018 for long-term performance and in 2019 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 113,305.
[2] | Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined.

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