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STOCK-BASED COMPENSATION (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 2,766,000 | $ 2,771,000 | $ 3,477,000 | $ 2,855,000 | $ 3,062,000 | $ 2,594,000 |  |  |
Award Recipient Type Director [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 174,000 |  |  | 230,000 |  |  | $ 591,000 | $ 336,000 |
Restricted stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Fair value of shares vested as of the vesting date |  |  |  |  |  |  |  | $ 12,208,000 |  |
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) |  |  |  |  |  |  |  | 135,133 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number |  | 84,564 | 84,616 |  |  |  |  | 84,564 |  | 102,508
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value (in shares) |  | $ 153.78 | $ 153.76 |  |  |  |  | $ 153.78 |  | $ 133.29
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period | [1],[2] | 0 |  |  |  |  |  | 61,875 |  |
Grant date fair value of shares issued (in dollars per share) | [1],[2] | $ 0 |  |  |  |  |  | $ 149.05 |  |
Forfeited (in shares) |  | 0 |  |  |  |  |  | (1,015) |  |
Forfeited (per share) |  | $ 0 |  |  |  |  |  | $ 144.79 |  |
Vested (in shares) |  | (52) |  |  |  |  |  | (78,804) |  |
Vested (per share) |  | $ 120.39 |  |  |  |  |  | $ 123.53 |  |
Fair value of shares granted, as of the grant dates |  |  |  |  |  |  |  | $ 9,222,000 |  |
Restricted stock [Member] | Award Recipient Type Employee [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 2,593,000 |  |  | 2,625,000 |  |  | 8,424,000 | 8,175,000 |
Stock-based compensation costs capitalized as development costs |  | $ 886,000 |  |  | $ 645,000 |  |  | $ 2,180,000 | $ 1,981,000 |
Company performance based award | Executive Officer [Member] | End of one-year performance period |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 34.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 1 year |  |
Company performance based award | Executive Officer [Member] | Each of the following two years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 33.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 2 years |  |
Individual performance based award | Executive Officer [Member] | End of one-year performance period |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 34.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 1 year |  |
Individual performance based award | Executive Officer [Member] | Each of the following two years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 33.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 2 years |  |
Total shareholder return | Executive Officer [Member] | Following year after performance period |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 25.00% |  |
Total shareholder return | Executive Officer [Member] | End of three-year performance period |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 75.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 3 years |  |
Continuing employment awards | Executive Officer [Member] | Each year of 4-year service period |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  | 25.00% |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  |  |  |  |  |  | 4 years |  |
[1] | Does not include the restricted shares that may be earned if the performance goals established in 2021 and 2022 for long-term performance and in 2023 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 135,133.
[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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