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UNSECURED BANK CREDIT FACILITIES (Details) | 12 Months Ended
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Dec. 31, 2022 USD ($) Integer | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Line of Credit Facility [Line Items] |  |  |
Unsecured bank credit facilities, net of debt issuance costs | $ 168,454,000 | $ 207,066,000 |
Average bank borrowings | $ 182,478,000 | $ 95,629,000 | $ 87,095,000
Weighted average interest rates (in hundredths) | 2.32% | 1.01% | 1.86%
Amortization of facility fees | $ 713,000 | $ 751,000 | $ 790,000
Amortization of debt issuance costs | $ 650,000 | 606,000 | $ 561,000
Moody's Credit Rating | Baa2 |  |
Former bank credit facility obtained in 2018 - $350 million | Nine bank group unsecured revolving credit facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Borrowing Capacity |  | $ 350,000,000 |
Debt instrument, margin (in basis points) |  | 100 |
Line of credit, facility fee (in basis points) |  | 20 |
Debt Instrument, Maturity Date, Description |  | July 30, 2022 |
Former credit facility obtained in 2018 - $45 million [Member] | Pnc Na Unsecured revolving credit facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Borrowing Capacity |  | $ 45,000,000 |
Debt instrument, margin (in basis points) |  | 100 |
Line of credit, facility fee (in basis points) |  | 20 |
Debt Instrument, Maturity Date, Description |  | July 30, 2022 |
$425 million credit facility - obtained in 2021 | Nine bank group unsecured revolving credit facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Borrowing Capacity | $ 425,000,000 |  |
Debt instrument, margin (in basis points) | 77.5 |  |
Line of credit, facility fee (in basis points) | 15 |  |
Credit facility, extension option | two six-month extensions |  |
Banks included in the unsecured revolving credit facility group | Integer | 9 |  |
Line of Credit Facility, Interest Rate at Period End | 5.146% |  |
Unsecured bank credit facilities - variable rate, carrying amount | $ 170,000,000 |  |
Letters of Credit Outstanding, Amount | $ 67,000 |  |
Debt Instrument, Maturity Date | Jul. 30, 2025 |  |
Line of credit facility, accordion | $ 325,000,000 |  |
$50 million credit facility - obtained in 2021 | Pnc Na Unsecured revolving credit facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Borrowing Capacity | $ 50,000,000 |  |
Debt instrument, margin (in basis points) | 77.5 |  |
Line of credit, facility fee (in basis points) | 15 |  |
Credit facility, extension option | two six-month extensions |  |
Line of Credit Facility, Interest Rate at Period End | 5.167% |  |
Unsecured bank credit facilities - variable rate, carrying amount | $ 0 |  |
Line of Credit Facility, Expiration Date | Jul. 30, 2025 |  |
Bank credit facility obtained in 2021 - $425 and $50 million | Nine bank group unsecured revolving credit facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Sustainability-linked pricing component, interest margin reduction (in basis points) | 1 |  |
Credit rating basis for initial pricing basis, credit facilities | BBB+/Baa1 |  |
Line of Credit Facility Covenant Terms, Consolidated Leverage Ratio | 32.50% |  |

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