STOCK-BASED COMPENSATION (Details)		12 Months Ended
		Dec. 31, 2023 USD ($) Integer $ / shares shares	Dec. 31, 2022 USD ($) Integer $ / shares shares	Dec. 31, 2021 USD ($) Integer $ / shares shares	Dec. 31, 2020 $ / shares shares
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost | $		$ 8,965,000	$ 8,292,000	$ 7,511,000
Shares withheld to satisfy the tax obligations (in shares)		31,254	34,251	30,252
Long-term equity compensation awards | Service Condition Only Awards [Member] | Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		9,583	5,830	7,801	7,217
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 165.83	$ 193.54	$ 138.93	$ 131.36
Restricted Stock Activity [Roll Forward]
Granted (in shares)		9,583	5,830	7,801	7,217
Restricted stock activity [Abstract]
Granted (in dollars per share) | $ / shares		$ 165.83	$ 193.54	$ 138.93	$ 131.36
Vesting of shares schedule [Abstract]
Grant date		Mar. 02, 2023	Mar. 03, 2022	Feb. 25, 2021	Mar. 06, 2020
Annual equity compensation awards | Individual performance awards [Member] | Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Grant date fair value of shares issued (in dollars per share) | $ / shares			$ 168.90	$ 190.89
Restricted stock activity [Abstract]
Granted (in dollars per share) | $ / shares			$ 168.90	$ 190.89
Vesting of shares schedule [Abstract]
Grant date			Feb. 15, 2023	Feb. 16, 2022
Performance period		1/1/23 - 12/31/23	1/1/22 - 12/31/22	1/1/21 - 12/31/21
Range of earnable shares - low end of range		0	0	0
Range of earnable shares - high end of range		5,358	3,323	4,756
Shares determined			3,022	4,374
Shares determined	[1]	N/A (1)
Grant date share price	[1]	N/A (1)
Grant date	[1]	N/A (1)
Annual equity compensation awards | Service Condition Only Awards [Member] | Non Executive Officers [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		20.00%
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)		11,325	11,225	9,200
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 172.70	$ 148.48	$ 168.35
Restricted Stock Activity [Roll Forward]
Granted (in shares)		11,325	11,225	9,200
Restricted stock activity [Abstract]
Granted (in dollars per share) | $ / shares		$ 172.70	$ 148.48	$ 168.35
Vesting of shares schedule [Abstract]
Grant date		Jun. 20, 2023	Jun. 20, 2022	Jul. 07, 2021
Vesting period		5 years
Award Recipient Type Employee [Member]
Stock Compensation Plan disclosure [Abstract]
Share awards granted (in shares)	[2],[3]	57,741	71,217	66,623
Restricted Stock Activity [Roll Forward]
Unvested at beginning of year (in shares)		96,708	106,056	113,125
Granted (in shares)	[2],[3]	57,741	71,217	66,623
Forfeited (in shares)		(1,015)	0	0
Vested (in shares)		(73,152)	(80,565)	(73,692)
Unvested at end of year (in shares)		80,282	96,708	106,056	113,125
Vesting of shares schedule [Abstract]
Total Unvested Shares (in shares)		80,282	96,708	106,056	113,125
Award Recipient Type Employee [Member] | Restricted Stock [Member]
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost | $		$ 11,013,000	$ 10,236,000	$ 9,136,000
Stock based compensation cost capitalized as development costs | $		$ 2,812,000	$ 2,510,000	$ 2,336,000
Grant date fair value of shares issued (in dollars per share) | $ / shares	[2],[3]	$ 148.28	$ 121.52	$ 115.30
Compensation is recognized over a weighted average period (in years)		2 years 9 months 18 days
Shares withheld to satisfy the tax obligations (in shares)		31,254	34,251	30,252
Fair value of shares granted | $		$ 8,562,000	$ 8,654,000	$ 7,682,000
Fair value of shares vested as of the vesting date | $		$ 11,304,000	$ 17,124,000	$ 10,322,000
Restricted Stock Activity [Roll Forward]
Unvested at end of year (in shares)		80,282
Restricted stock activity [Abstract]
Unvested at beginning of year (in dollars per share) | $ / shares		$ 131.79	$ 116.37	$ 100.86
Granted (in dollars per share) | $ / shares	[2],[3]	148.28	121.52	115.30
Forfeited (in dollars per share) | $ / shares		144.79	0	0
Vested (in dollars per share) | $ / shares		120.87	102.42	91.59
Unvested at end of year (in dollars per share) | $ / shares		$ 153.43	$ 131.79	$ 116.37	$ 100.86
Vesting of shares schedule [Abstract]
Unvested shares in 2024(in shares)		41,741
Unvested shares in 2025 (in shares)		19,510
Unvested shares in 2026 (in shares)		9,983
Unvested shares in 2027 (in shares)		6,783
Unvested shares in 2028 (in shares)		2,265
Total Unvested Shares (in shares)		80,282
Range of earnable shares - low end of range		0
Range of earnable shares - high end of range		135,133
Accrued dividends on unvested restricted stock | $		$ 1,921,000	$ 1,610,000	$ 1,585,000
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount | $		4,219,000
Award Recipient Type Director [Member]
Stock Compensation Plan disclosure [Abstract]
Stock-based compensation cost | $		$ 764,000	$ 566,000	$ 711,000
Share awards granted (in shares)		4,134	5,696	0
Restricted Stock Activity [Roll Forward]
Unvested at beginning of year (in shares)		5,800	156	278
Granted (in shares)		4,134	5,696	0
Forfeited (in shares)		0	0	0
Vested (in shares)		(5,652)	(52)	(122)
Unvested at end of year (in shares)		4,282	5,800	156	278
Vesting of shares schedule [Abstract]
Total Unvested Shares (in shares)		4,282	5,800	156	278
Award Recipient Type Director [Member] | Restricted Stock [Member]
Stock Compensation Plan disclosure [Abstract]
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 159.79	$ 159.00	$ 0
Fair value of shares granted | $		$ 661,000	$ 906,000	$ 0
Fair value of shares vested as of the vesting date | $		$ 904,000	$ 8,000	$ 21,000
Restricted stock activity [Abstract]
Unvested at beginning of year (in dollars per share) | $ / shares		$ 158.31	$ 120.39	$ 112.45
Granted (in dollars per share) | $ / shares		159.79	159.00	0
Forfeited (in dollars per share) | $ / shares		0	0	0
Vested (in dollars per share) | $ / shares		158.00	120.39	102.30
Unvested at end of year (in dollars per share) | $ / shares		$ 160.15	$ 158.31	$ 120.39	$ 112.45
Award Recipient Type Director [Member] | Annual retainer awards
Stock Compensation Plan disclosure [Abstract]
Shares issued to directors (in shares)				4,466
Award Recipient Type Director [Member] | Annual restricted share awards
Stock Compensation Plan disclosure [Abstract]
Shares issued to directors (in shares)		4,134	5,568
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)			1,422,437	1,477,241
Equity Incentive Plan 2013 [Member] | Annual equity compensation awards | Company Performance Awards [Member] | Executive Officer [Member]
Stock Compensation Plan disclosure [Abstract]
Grant date fair value of shares issued (in dollars per share) | $ / shares		$ 165.83	$ 193.54	$ 138.93
Restricted stock activity [Abstract]
Granted (in dollars per share) | $ / shares		$ 165.83	$ 193.54	$ 138.93
Vesting of shares schedule [Abstract]
Grant date		Mar. 02, 2023	Mar. 03, 2022	Feb. 25, 2021
Performance period		1/1/23 - 12/31/23	1/1/22 - 12/31/22	1/1/21 - 12/31/21
Range of earnable shares - low end of range		0	0	0
Range of earnable shares - high end of range		21,438	13,289	19,052
Shares determined			12,761	18,798
Shares determined	[4]		N/A (1)
Equity Incentive Plan 2013 [Member] | Annual equity compensation awards | Company Performance Awards [Member] | Executive Officer [Member] | End of the one-year performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		34.00%
Vesting of shares schedule [Abstract]
Vesting period		1 year
Equity Incentive Plan 2013 [Member] | Annual equity compensation awards | Company Performance Awards [Member] | Executive Officer [Member] | Following two years after performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		33.00%
Vesting of shares schedule [Abstract]
Vesting period		2 years
Equity Incentive Plan 2013 [Member] | Annual equity compensation awards | Individual performance awards [Member] | Executive Officer [Member] | End of the one-year performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		34.00%
Vesting of shares schedule [Abstract]
Vesting period		1 year
Equity Incentive Plan 2013 [Member] | Annual equity compensation awards | Individual performance awards [Member] | Executive Officer [Member] | Following two years after performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		33.00%
Vesting of shares schedule [Abstract]
Vesting period		2 years
Equity Incentive Plan 2023
Stock Compensation Plan disclosure [Abstract]
Authorized shares of common stock (in shares)		1,500,000
Shares available for grant (in shares)		1,484,116
New Director Stock Awards to be Issued in Future Periods [Member] | Equity Incentive Plan 2023 | 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%
New Director Restricted Stock Award Amount to be Awarded in Future Periods | $		$ 25,000
Vesting of shares schedule [Abstract]
Number of years in total shareholder return performance period | Integer		4
Annual retainer awards | Equity Incentive Plan 2023 | Award Recipient Type Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual Director Retainer Stock Award Amount | $		$ 110,000
Three year period [Member] | Long-term equity compensation awards | Award Recipient Type Employee [Member]
Vesting of shares schedule [Abstract]
Valuation date		Mar. 02, 2023	Mar. 03, 2022	Feb. 25, 2021
Risk Free Interest Rate		4.68%	1.64%	0.39%
Expected Volatility Rate		31.01%	30.01%	30.51%
Expected Volatility Rate for Peer Group Companies, Minimum		27.31%	26.32%	26.87%
Expected Volatility Rate for Peer Group Companies, Maximum		51.26%	50.10%	54.25%
Expected dividend yield		3.02%	2.27%	2.27%
Number of simulation paths | Integer		1,000,000	1,000,000	1,000,000
Grant date fair value | $		$ 4,885,000	$ 2,912,000	$ 2,941,000
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Restricted Stock [Member] | Service Condition Only Awards [Member] | Executive Officer [Member] | Rate for each of the following four years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		25.00%
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Long-term equity compensation awards | Shareholder Return Awards [Member] | Executive Officer [Member]
Vesting of shares schedule [Abstract]
Grant date		Mar. 02, 2023	Mar. 03, 2022	Feb. 25, 2021	Mar. 06, 2020
Performance period		1/1/23 - 12/31/25	1/1/22 - 12/31/24	1/1/21 - 12/31/23	1/1/20 - 12/31/22
Range of earnable shares - low end of range		0	0	0	0
Range of earnable shares - high end of range		44,725	27,212	36,400	25,261
Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other Than Options, number of shares determined (string)	[5]	N/A (1)	N/A (1)	N/A (1)
Shares determined					21,050
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Long-term equity compensation awards | Shareholder Return Awards [Member] | Executive Officer [Member] | End of the three-year performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		75.00%
Three year period [Member] | Equity Incentive Plan 2013 [Member] | Long-term equity compensation awards | Shareholder Return Awards [Member] | Executive Officer [Member] | Following year after performance period
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights percentage		25.00%

[1] The performance conditions for this award have not yet been satisfied and the grant date and number of shares have not yet been determined

[2] 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.

[3] Includes shares granted in prior years for which performance conditions have been satisfied and the number of shares have been determined

[4] The performance conditions for this award have not yet been satisfied and the number of shares have not yet been determined.

[5] The performance conditions for this award have not yet been satisfied and the number of shares have not yet been determined.