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STOCK-BASED COMPENSATION (Details)		12 Months Ended
		Dec. 31, 2020 USD ($) Integer $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 $ / shares shares
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost | $		$ 8,502,000	$ 9,374,000	$ 6,103,000
Share awards granted (in shares)	[1]	69,446	59,943	50,217
Restricted Stock Activity [Roll Forward]
Granted (in shares)	[1]	69,446	59,943	50,217
Forfeited (in shares)		(440)	(3,010)	0
Vested (in shares)		(86,765)	(69,363)	(59,547)
Total Unvested Shares (in shares)		113,125	130,884	143,314	152,644
Share Based Payment Arrangement [Abstract]
Total Unvested Shares (in shares)		113,125	130,884	143,314	152,644
Award Recipient Type Employee [Member] | Restricted Stock [Member]
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost | $		$ 7,605,000	$ 8,647,000	$ 5,322,000
Stock based compensation cost capitalized as development costs | $		$ 1,923,000	$ 2,536,000	$ 1,173,000
Grant date fair value of shares issued (in dollars per share) | $ / shares	[1]	$ 101.19	$ 94.62	$ 84.09
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 | $		$ 5,004,000
Shares withheld to satisfy the tax obligations (in shares)		36,445	28,955	23,824
Fair value of shares granted | $		$ 7,028,000	$ 5,672,000	$ 4,223,000
Fair value of shares vested as of the vesting date | $		$ 11,754,000	$ 6,662,000	$ 5,142,000
Restricted Stock Activity [Roll Forward]
Total Unvested Shares (in shares)		113,125
Restricted stock activity weighted average price [Abstract]
Unvested at beginning of year (in dollars per share) | $ / shares		$ 82.78	$ 70.26	$ 63.18
Granted (in dollars per share) | $ / shares	[1]	101.19	94.62	84.09
Forfeited (in dollars per share) | $ / shares		112.14	86.19	0
Vested (in dollars per share) | $ / shares		73.80	66.99	63.77
Unvested at end of year (in dollars per share) | $ / shares		$ 100.86	$ 82.78	$ 70.26	$ 63.18
Share Based Payment Arrangement [Abstract]
Unvested shares in 2021 (in shares)		44,807
Unvested shares in 2022 (in shares)		31,870
Unvested shares in 2023 (in shares)		22,089
Unvested shares in 2024 (in shares)		11,899
Unvested shares in 2025 (in shares)		2,460
Total Unvested Shares (in shares)		113,125
Award Recipient Type Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual Director Retainer Stock Award Amount | $		$ 100,000
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost | $		897,000	$ 727,000	$ 1,134,000
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	$ 9,000	$ 7,000
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)		1,527,382	1,583,223	1,629,281
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)		109,884
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 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, 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)		208			282
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 120.39			$ 88.86
Restricted Stock Activity [Roll Forward]
Granted (in shares)		208			282
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) | $ / shares		$ 120.39			$ 88.86
Share Based Payment Arrangement [Abstract]
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting within one year)					25.00%
Award Recipient Type Director [Member]
Stock Compensation Plan disclosure [Abstract]
Shares issued to directors (in shares)		8,182	6,384	8,478
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
Share Based Payment Arrangement [Abstract]
Number of years in total shareholder return performance period | Integer		4
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%
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
Share Based Payment Arrangement [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
Share Based Payment Arrangement [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]
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 that vested when number of shares determined		75.00%
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)		18,917
Restricted Stock Activity [Roll Forward]
Granted (in shares)		18,917
Share Based Payment Arrangement [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] | 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)		27,087
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%
Share Based Payment Arrangement [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, Percent that vested when number of shares determined		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%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		9,162
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 105.97
Restricted Stock Activity [Roll Forward]
Granted (in shares)		9,162
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) | $ / shares		$ 105.97
Share Based Payment Arrangement [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent that vested in first year		20.00%
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, Percent that vested when number of shares determined		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%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		15,990
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 122.61
Restricted Stock Activity [Roll Forward]
Granted (in shares)		15,990
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) | $ / shares		$ 122.61
Share Based Payment Arrangement [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent that vested in first year		20.00%
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, Percent that vested when number of shares determined		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%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		5,860
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 141.63
Restricted Stock Activity [Roll Forward]
Granted (in shares)		5,860
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) | $ / shares		$ 141.63
Share Based Payment Arrangement [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent that vested during first year		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, Percent that vested when number of shares determined		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)		9,947
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 105.97
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
Share Based Payment Arrangement [Abstract]
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, Percent that vested during first year		25.00%
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)		33,442
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%
Share Based Payment Arrangement [Abstract]
Number of years in total shareholder return performance period | Integer		3
2020 Awards [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]
Share Based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting Rights (% vesting per year in future years)		33.00%
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)		19,282
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, 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		34.00%
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) | $ / shares		$ 131.36
2020 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)		33.00%
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)		4,812
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		34.00%
2020 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
2020 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)		7,217
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, 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)		7,217
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) | $ / shares		$ 131.36
2020 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		2
2020 Awards [Member] | 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)		12,300
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 105.30
Restricted Stock Activity [Roll Forward]
Granted (in shares)		12,300
Restricted stock activity weighted average price [Abstract]
Granted (in dollars per share) | $ / shares		$ 105.30
2020 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)		25,261
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%
Share Based Payment Arrangement [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 2018 and 2019 for long-term performance and in 2020 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 109,884.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Number of shares authorized for issuance under share-based payment arrangement.

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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