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STOCK-BASED COMPENSATION (Details) | 3 Months Ended | 12 Months Ended |  |  |
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Sep. 30, 2017 $ / shares shares | Dec. 31, 2019 USD ($) Integer $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2013 $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 shares | Dec. 31, 2017 shares
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Stock-based compensation cost | $ |  |  | $ 9,374,000 | $ 6,103,000 | $ 7,012,000 |  |  |  |
Award Recipient Type Employee [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Stock-based compensation cost | $ |  |  | 8,647,000 | 5,322,000 | 6,309,000 |  |  |  |
Stock based compensation cost capitalized as development costs | $ |  |  | $ 2,536,000 | $ 1,173,000 | $ 1,458,000 |  |  |  |
Share awards granted (in shares) | [1] |  | 59,943 | 50,217 | 93,285 |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares | [1] |  | $ 94.62 | $ 84.09 | $ 76.70 |  |  |  |
Compensation is recognized over a weighted average period (in years) |  |  | 2 years 8 months 12 days |  |  |  |  |  |
Share based compensation, share based payment arrangements other than stock options, unrecognized cost associated with awards not yet vested | $ |  |  | $ 4,556,000 |  |  |  |  |  |
Shares withheld to satisfy the tax obligations (in shares) |  |  | 28,955 | 23,824 | 33,695 |  |  |  |
Fair value of shares granted | $ |  |  | $ 5,672,000 | $ 4,223,000 | $ 7,155,000 |  |  |  |
Fair value of shares vested as of the vesting date | $ |  |  | $ 6,662,000 | $ 5,142,000 | $ 6,441,000 |  |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Unvested at beginning of year (in shares) |  |  | 143,314 | 152,644 | 162,087 |  |  |  |
Granted (in shares) | [1] |  | 59,943 | 50,217 | 93,285 |  |  |  |
Forfeited (in shares) |  |  | 3,010 | 0 | 16,000 |  |  |  |
Vested (in shares) |  |  | (69,363) | (59,547) | (86,728) |  |  |  |
Unvested at end of year (in shares) |  |  | 130,884 | 143,314 | 152,644 |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Unvested at beginning of year (in dollars per share) | $ / shares |  |  | $ 70.26 | $ 63.18 | $ 51.97 |  |  |  |
Granted (in dollars per share) | $ / shares | [1] |  | 94.62 | 84.09 | 76.70 |  |  |  |
Forfeited (in dollars per share) | $ / shares |  |  | 86.19 | 0 | 36.98 |  |  |  |
Vested (in dollars per share) | $ / shares |  |  | 66.99 | 63.77 | 61.62 |  |  |  |
Unvested at end of year (in dollars per share) | $ / shares |  |  | $ 82.78 | $ 70.26 | $ 63.18 |  |  |  |
Nonvested Shares Vesting Schedule [Abstract] |  |  |  |  |  |  |  |  |
2020 (in shares) |  |  |  |  |  |  | 63,931 |  |
2021 (in shares) |  |  |  |  |  |  | 30,897 |  |
2022 (in shares) |  |  |  |  |  |  | 21,934 |  |
2023 (in shares) |  |  |  |  |  |  | 12,152 |  |
2024 (in shares) |  |  |  |  |  |  | 1,970 |  |
Total Nonvested Shares (in shares) |  |  | 130,884 | 152,644 | 152,644 |  | 130,884 | 143,314 | 152,644
Award Recipient Type Director [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Annual Director Retainer Stock Award Amount | $ |  |  |  |  |  |  | $ 90,000 |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Stock-based compensation cost | $ |  |  | $ 727,000 | $ 1,134,000 | $ 670,000 |  |  |  |
Award Recipient Type Director [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Fair value of shares vested as of the vesting date | $ |  |  | $ 9,000 | $ 7,000 | $ 9,000 |  |  |  |
Management Incentive Plan 2004 [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Authorized shares of common stock (in shares) |  |  |  |  |  |  | 1,900,000 |  |
Equity Incentive Plan 2013 [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Authorized shares of common stock (in shares) |  |  |  |  |  |  | 2,000,000 |  |
Shares available for grant (in shares) |  |  |  |  |  |  | 1,583,223 | 1,629,281 | 1,671,981
Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 113,305 |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (minimum) |  |  | 0 |  |  |  |  |  |
Equity Incentive Plan 2013 [Member] | Award Recipient Type Employee [Member] | Restricted Stock [Member] | Non Executive Officers [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 20.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share awards granted (in shares) |  |  | 10,175 |  |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  | $ 112.14 |  |  |  |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 10,175 |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 112.14 |  |  |  |  |  |
Equity Incentive Plan 2013 [Member] | Award Recipient Type Director [Member] | Restricted Stock [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, Vesting Rights (% vesting per year in future years) |  | 25.00% |  |  |  | 25.00% |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share awards granted (in shares) |  | 282 |  |  |  | 417 |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  | $ 88.86 |  |  |  | $ 59.97 |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 282 |  |  |  | 417 |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  | $ 88.86 |  |  |  | $ 59.97 |  |  |
Award Recipient Type Director [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Shares issued to directors (in shares) |  |  | 6,384 | 8,478 | 8,881 |  |  |  |
New Director Stock Awards to be Issued in Future Periods [Member] | Award Recipient Type Director [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
New Director Restricted Stock Award Amount to be Awarded in Future Periods | $ |  |  | $ 25,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 4 years |  |  |  |  |  |
2017 Awards [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  | 3 |  |  |  |  |  |
2017 Awards [Member] | 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] |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share awards granted (in shares) |  |  | 5,406 |  |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  | $ 78.18 |  |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  | 1 |  |  |  |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 5,406 |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 78.18 |  |  |  |  |  |
2017 Awards [Member] | 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 [Line Items] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date |  |  | 100.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share awards granted (in shares) |  |  | 4,257 |  |  |  |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 4,257 |  |  |  |  |  |
Nonvested Shares Vesting Schedule [Abstract] |  |  |  |  |  |  |  |  |
Number of years in total shareholder return performance period | Integer |  |  | 1 |  |  |  |  |  |
2017 Awards [Member] | Two 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 [Line Items] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date |  |  | 100.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share awards granted (in shares) |  |  | 9,460 |  |  |  |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 9,460 |  |  |  |  |  |
Nonvested Shares Vesting Schedule [Abstract] |  |  |  |  |  |  |  |  |
Number of years in total shareholder return performance period | Integer |  |  | 2 |  |  |  |  |  |
2017 Awards [Member] | Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 18,917 |  |  |  |  |  |
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, Percent of future vesting that will occur on grant date |  |  | 75.00% |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  | 25.00% |  |  |  |  |  |
Nonvested Shares Vesting Schedule [Abstract] |  |  |  |  |  |  |  |  |
Number of years in total shareholder return performance period | Integer |  |  | 3 |  |  |  |  |  |
2018 Awards [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  | 1 |  |  |  |  |  |
2018 Awards [Member] | 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] |  |  |  |  |  |  |  |  |
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% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share awards granted (in shares) |  |  | 7,884 |  |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  | $ 95.19 |  |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  | 1 |  |  |  |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 7,884 |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 95.19 |  |  |  |  |  |
2018 Awards [Member] | Equity Incentive Plan 2013 [Member] | Award Recipient Type Employee [Member] | Restricted Stock [Member] | Company Performance Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 20.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 24,690 |  |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  | $ 95.19 |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 95.19 |  |  |  |  |  |
2018 Awards [Member] | Equity Incentive Plan 2013 [Member] | Award Recipient Type Employee [Member] | Restricted Stock [Member] | Individual performance awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  | 20.00% |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of vesting that occurred on grant date |  |  | 20.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 5,671 |  |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  | $ 107.37 |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 107.37 |  |  |  |  |  |
2018 Awards [Member] | Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 27,596 |  |  |  |  |  |
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, Percent of future vesting that will occur on grant date |  |  | 75.00% |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  | 25.00% |  |  |  |  |  |
Nonvested Shares Vesting Schedule [Abstract] |  |  |  |  |  |  |  |  |
Number of years in total shareholder return performance period | Integer |  |  | 3 |  |  |  |  |  |
2019 Awards [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards - Part A [Member] | Executive Officer [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, Vesting Rights (% vesting per year in future years) |  |  | 20.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 9,594 |  |  |  |  |  |
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, Potential Grants in Future Period (minimum) |  |  | 0 |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on grant date |  |  | 20.00% |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 105.97 |  |  |  |  |  |
2019 Awards [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Company Performance Awards - Part B [Member] | Executive Officer [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, Vesting Rights (% vesting per year in future years) |  |  | 20.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 15,992 |  |  |  |  |  |
Grant date fair value of shares issued (in dollars per share) | $ / shares |  |  | $ 122.61 |  |  |  |  |  |
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, Percent of future vesting that will occur on grant date |  |  | 20.00% |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 122.61 |  |  |  |  |  |
2019 Awards [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] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) |  |  | 20.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
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, Potential Grants in Future Period (minimum) |  |  | 0 |  |  |  |  |  |
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent of future vesting that will occur on grant date |  |  | 20.00% |  |  |  |  |  |
2019 Awards [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  | 1 |  |  |  |  |  |
2019 Awards [Member] | 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] |  |  |  |  |  |  |  |  |
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years) |  |  | 25.00% |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share awards granted (in shares) |  |  | 9,947 |  |  |  |  |  |
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, Percent of future vesting that will occur on grant date |  |  | 25.00% |  |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  | 1 |  |  |  |  |  |
Restricted Stock Activity [Roll Forward] |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 9,947 |  |  |  |  |  |
Restricted stock activity weighted average price [Abstract] |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | $ / shares |  |  | $ 105.97 |  |  |  |  |  |
2019 Awards [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Annual equity plan [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Equity Instruments other than options, number of plans | Integer |  |  | 3 |  |  |  |  |  |
2019 Awards [Member] | Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Shareholder Return Awards [Member] | Executive Officer [Member] |  |  |  |  |  |  |  |  |
Stock Compensation Plan disclosure [Abstract] |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other Than Options, Potential Grants in Future Period (maximum) |  |  | 34,812 |  |  |  |  |  |
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, Percent of future vesting that will occur on grant date |  |  | 75.00% |  |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Possible Shares To Be Awarded Vesting Rights |  |  | 25.00% |  |  |  |  |  |
Nonvested Shares Vesting Schedule [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 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.

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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