UNSECURED AND SECURED DEBT (Details)		12 Months Ended
		Dec. 31, 2022 USD ($) basisPoints Integer		Dec. 31, 2021 USD ($) basisPoints	Dec. 31, 2020 USD ($)
Secured and Unsecured Debt [Line Items]
Unsecured bank credit facilities, net of debt issuance costs		$ 168,454,000		$ 207,066,000
Unsecured debt - fixed rate, carrying amount		1,695,000,000		1,245,000,000
Unsecured debt, net of debt issuance costs		1,691,259,000		1,242,570,000
Secured debt, net of debt issuance costs		2,031,000		2,142,000
Total debt, net of debt issuance costs		$ 1,861,744,000		$ 1,451,778,000
Weighted average interest rates (in hundredths)		2.32%		1.01%	1.86%
Debt assumed in the purchase of real estate, repaid promptly during the quarter with no penalty		$ 60,000,000		$ 0	$ 0
Payments of principal over future years [Abstract]
Proceeds from unsecured debt		525,000,000		175,000,000	$ 275,000,000
Tulloch Corporation | 2022 Acquisitions
Secured and Unsecured Debt [Line Items]
Debt assumed in the purchase of real estate, repaid promptly during the quarter with no penalty		$ 60,000,000
Tulloch Corporation | 2022 operating properties acquired
Secured and Unsecured Debt [Line Items]
Number of Businesses Acquired | Integer		14
Tulloch Corporation | 2022 development land acquisitions
Secured and Unsecured Debt [Line Items]
Number of land parcels acquired | Integer		2
$75 Million Unsecured Term Loan (2015) [Member]
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[1]	1.40%
Effective interest rate	[1]	3.03%
Debt Instrument, Maturity Date	[1]	Feb. 28, 2022
Unsecured debt - fixed rate, carrying amount	[1]	$ 0		75,000,000
Interest rate of term loan repaid		3.03%
Unsecured debt, carrying amount repaid		$ 75,000,000
$65 million term loan (2016) [Member]
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[1]	1.10%
Effective interest rate	[1]	2.31%
Debt Instrument, Maturity Date	[1]	Apr. 01, 2023
Unsecured debt - fixed rate, carrying amount	[1]	$ 65,000,000		65,000,000
Fifty million senior unsecured notes [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.80%
Debt Instrument, Maturity Date		Aug. 28, 2023
Unsecured debt - fixed rate, carrying amount		$ 50,000,000		50,000,000
Twenty million senior unsecured notes [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.80%
Debt Instrument, Maturity Date		Aug. 28, 2025
Unsecured debt - fixed rate, carrying amount		$ 20,000,000		20,000,000
Sixty million senior unsecured notes (executed in 2017) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.46%
Debt Instrument, Maturity Date		Dec. 13, 2024
Unsecured debt - fixed rate, carrying amount		$ 60,000,000		60,000,000
Sixty million senior unsecured notes (executed in 2016) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.48%
Debt Instrument, Maturity Date		Dec. 15, 2024
Unsecured debt - fixed rate, carrying amount		$ 60,000,000		60,000,000
Forty million senior unsecured notes (executed in 2016) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.75%
Debt Instrument, Maturity Date		Dec. 15, 2026
Unsecured debt - fixed rate, carrying amount		$ 40,000,000		40,000,000
Twenty-five million senior unsecured notes (executed in 2015) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.97%
Debt Instrument, Maturity Date		Oct. 01, 2025
Unsecured debt - fixed rate, carrying amount		$ 25,000,000		25,000,000
Fifty million senior unsecured notes (executed in 2015) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.99%
Debt Instrument, Maturity Date		Oct. 07, 2025
Unsecured debt - fixed rate, carrying amount		$ 50,000,000		50,000,000
Sixty million senior unsecured notes (executed in 2018) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.93%
Debt Instrument, Maturity Date		Apr. 10, 2028
Unsecured debt - fixed rate, carrying amount		$ 60,000,000		60,000,000
$80 million senior unsecured private placement notes (2019) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		4.27%
Debt Instrument, Maturity Date		Mar. 28, 2029
Unsecured debt - fixed rate, carrying amount		$ 80,000,000		80,000,000
$35 million senior unsecured private placement notes (2019) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.54%
Debt Instrument, Maturity Date		Aug. 15, 2031
Unsecured debt - fixed rate, carrying amount		$ 35,000,000		35,000,000
$75 million senior unsecured private placement notes (2019) [Member]
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.47%
Debt Instrument, Maturity Date		Aug. 19, 2029
Unsecured debt - fixed rate, carrying amount		$ 75,000,000		$ 75,000,000
$100 million term loan (2019) [Member]
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[2],[3]	0.95%
Effective interest rate		2.10%	[2],[3]	2.75%
Debt Instrument, Maturity Date	[2],[3]	Oct. 10, 2026
Unsecured debt - fixed rate, carrying amount	[2],[3]	$ 100,000,000		$ 100,000,000
$100 million term loan (2020)
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[2],[4]	0.95%
Effective interest rate		1.80%	[2],[4]	2.39%
Debt Instrument, Maturity Date	[2],[4]	Mar. 25, 2027
Debt Instrument, Term		5 years
Unsecured debt - fixed rate, carrying amount	[2],[4]	$ 100,000,000		$ 100,000,000
Basis point reduction in credit spread | basisPoints		60
Debt instrument, margin (in basis points) | basisPoints		95
Debt instrument, fixed interest rate		1.80%
$100 million senior unsecured private placement notes (2020)
Secured and Unsecured Debt [Line Items]
Effective interest rate		2.61%
Debt Instrument, Maturity Date		Oct. 14, 2030
Unsecured debt - fixed rate, carrying amount		$ 100,000,000		100,000,000
$75 million senior unsecured private placement notes (2020)
Secured and Unsecured Debt [Line Items]
Effective interest rate		2.71%
Debt Instrument, Maturity Date		Oct. 14, 2032
Unsecured debt - fixed rate, carrying amount		$ 75,000,000		75,000,000
$50 million unsecured term loan (2021)
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[2],[5]	1.10%
Effective interest rate	[2],[5]	1.58%
Debt Instrument, Maturity Date	[2],[5]	Mar. 18, 2025
Unsecured debt - fixed rate, carrying amount	[2],[5]	$ 50,000,000		50,000,000
$125 million senior unsecured private placement notes (2021)
Secured and Unsecured Debt [Line Items]
Effective interest rate		2.74%
Debt Instrument, Maturity Date		Jun. 10, 2031
Unsecured debt - fixed rate, carrying amount		$ 125,000,000		125,000,000
$100 million senior unsecured term loan (new in 2022)
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[2]	1.40%
Effective interest rate	[2]	3.06%
Debt Instrument, Maturity Date	[2]	Sep. 29, 2028
Debt Instrument, Term		6 years 6 months
Unsecured debt - fixed rate, carrying amount	[2]	$ 100,000,000		0
$150 million senior note (2022)
Secured and Unsecured Debt [Line Items]
Effective interest rate		3.03%
Debt Instrument, Maturity Date		Apr. 20, 2032
Debt Instrument, Term		10 years
Unsecured debt - fixed rate, carrying amount		$ 150,000,000		0
$50 million term loan (2022)
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[2]	0.95%
Effective interest rate	[2]	4.09%
Debt Instrument, Maturity Date	[2]	Aug. 30, 2024
Debt Instrument, Term		2 years
Unsecured debt - fixed rate, carrying amount	[2]	$ 50,000,000		0
$ 75 million term loan (2022)
Secured and Unsecured Debt [Line Items]
Debt instrument, margin	[2]	0.95%
Effective interest rate	[2]	4.00%
Debt Instrument, Maturity Date	[2]	Aug. 31, 2027
Debt Instrument, Term		5 years
Unsecured debt - fixed rate, carrying amount	[2]	$ 75,000,000		0
$75 million senior unsecured private placement notes (2022)
Secured and Unsecured Debt [Line Items]
Effective interest rate		4.90%
Debt Instrument, Maturity Date		Oct. 12, 2033
Unsecured debt - fixed rate, carrying amount		$ 75,000,000		0
$75 million senior unsecured private placement notes - second tranche (2022)
Secured and Unsecured Debt [Line Items]
Effective interest rate		4.95%
Debt Instrument, Maturity Date		Oct. 12, 2034
Unsecured debt - fixed rate, carrying amount		$ 75,000,000		0
$125 million senior unsecured term loan (total loan with $75M and $50M tranches)
Secured and Unsecured Debt [Line Items]
Debt instrument, margin		0.95%
Unsecured debt - fixed rate, carrying amount		$ 125,000,000
Sustainability-linked pricing component, interest margin reduction (in basis points)		1
Secured and unsecured debt, net of debt issuance costs
Payments of principal over future years [Abstract]
2023		$ 115,119,000
2024		170,122,000
2025		145,128,000
2026		141,672,000
2027		$ 175,000,000
$100 million term loan (refinanced in 2021)
Secured and Unsecured Debt [Line Items]
Unsecured debt - fixed rate, carrying amount				$ 100,000,000
Basis point reduction in credit spread | basisPoints				65
Forty Million Unsecured Term Loan (repaid in 2021)
Secured and Unsecured Debt [Line Items]
Effective interest rate				2.34%
Unsecured debt, carrying amount repaid				$ 40,000,000
New unsecured debt (2021)
Secured and Unsecured Debt [Line Items]
Weighted average interest rates (in hundredths)				2.40%
Ramona Distribution Center [Member]
Secured and Unsecured Debt [Line Items]
Interest Rate (in hundredths)		3.85%
Monthly P & I Payment		$ 16,287
Maturity Date		11/30/2026
Carrying Amount of Securing Real Estate		$ 8,333,000
Secured debt - fixed rate, carrying amount		2,041,000		$ 2,156,000
Notes Payable to Banks [Member]
Secured and Unsecured Debt [Line Items]
Unsecured bank credit facilities - variable rate, carrying amount		170,000,000		209,210,000
Unsecured bank credit facilities, net of debt issuance costs		168,454,000		207,066,000
Unamortized debt issuance costs		1,546,000		2,144,000
Unsecured Debt [Member]
Secured and Unsecured Debt [Line Items]
Unsecured debt - fixed rate, carrying amount	[6]	1,695,000,000		1,245,000,000
Unsecured debt, net of debt issuance costs		1,691,259,000		1,242,570,000
Unamortized debt issuance costs		3,741,000		2,430,000
Secured Debt [Member]
Secured and Unsecured Debt [Line Items]
Secured debt - fixed rate, carrying amount	[6]	2,041,000		2,156,000
Secured debt, net of debt issuance costs		2,031,000		2,142,000
Unamortized debt issuance costs		10,000		$ 14,000
$150 million senior unsecured private placement notes (total loan with $75M and $75M tranches)
Secured and Unsecured Debt [Line Items]
Unsecured debt - fixed rate, carrying amount		$ 150,000,000
Number of notes in debt agreement | Integer		2
$75 million senior unsecured private placement notes (2022)
Secured and Unsecured Debt [Line Items]
Debt Instrument, Term		11 years
Unsecured debt - fixed rate, carrying amount		$ 75,000,000
$75 million senior unsecured private placement notes - second tranche (2022)
Secured and Unsecured Debt [Line Items]
Debt Instrument, Term		12 years
Unsecured debt - fixed rate, carrying amount		$ 75,000,000

[1] The interest rates on these unsecured term loans are comprised of LIBOR plus a margin which is subject to a pricing grid for changes in the Company’s coverage ratings. The Company entered into interest rate swap agreements (further described in Note 12) to convert the loans’ LIBOR rates to effectively fixed interest rates. The interest rates in the table above are the effectively fixed interest rates for the loans, including the effects of the interest rate swaps, as of December 31, 2022.

[2] The interest rates on these unsecured term loans are comprised of Term Secured Overnight Financing Rate (“SOFR”) plus a margin which is subject to a pricing grid for changes in the Company’s coverage ratings. The Company entered into interest rate swap agreements (further described in Note 12) to convert the loans’ Term SOFR rates to effectively fixed interest rates. The interest rates in the table above are the effectively fixed interest rates for the loans, including the effects of the interest rate swaps, as of December 31, 2022.

[3] This term loan was refinanced effective October 10, 2021. The margin above LIBOR was reduced by 65 basis points, changing the effectively fixed rate from 2.75% to 2.10%. Also, effective August 31, 2022, the loan was amended to replace LIBOR with Term SOFR.

[4] This term loan was amended and refinanced effective March 25, 2022. The margin was reduced by approximately 60 basis points, changing the effectively fixed rate from 2.39% to 1.80%, and LIBOR was replaced with Term SOFR.

[5] This term loan was amended effective December 19, 2022 to replace LIBOR with Term SOFR.

[6] These loans have a fixed interest rate or an effectively fixed interest rate due to interest rate swaps.