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UNSECURED BANK CREDIT FACILITIES (Details) | 12 Months Ended
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Dec. 31, 2021 USD ($) Integer | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Line of Credit Facility [Line Items] |  |  |
Unsecured bank credit facilities, net of debt issuance costs | $ 207,066,000 | $ 124,194,000 |
Average bank borrowings | $ 95,629,000 | $ 87,095,000 | $ 172,175,000
Weighted average interest rates (in hundredths) | 1.01% | 1.86% | 3.34%
Amortization of facility fees | $ 751,000 | $ 790,000 | $ 790,000
Amortization of debt issuance costs | 606,000 | $ 561,000 | $ 556,000
$425 million credit facility - obtained in 2021 |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 425,000,000 |  |
Debt instrument, spread above LIBOR variable rate (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 | 0.875% |  |
Unsecured bank credit facilities - variable rate, carrying amount | $ 183,000,000 |  |
Letters of Credit Outstanding, Amount | 674,000 |  |
Expansion option on credit facility | $ 325,000,000 |  |
Debt Instrument, Maturity Date | Jul. 30, 2025 |  |
$50 million credit facility - obtained in 2021 |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 50,000,000 |  |
Debt instrument, spread above LIBOR variable rate (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 | 0.876% |  |
Unsecured bank credit facilities - variable rate, carrying amount | $ 26,210,000 |  |
Debt Instrument, Maturity Date | Jul. 30, 2025 |  |
Credit facilities - obtained in 2021 |  |  |
Line of Credit Facility [Line Items] |  |  |
Favorable pricing level - leverage ratio maximum | 32.50% |  |
Debt Instrument, Credit Rating | Baa2 |  |
Sustainability-linked pricing component, interest margin reduction (in basis points) | 1 |  |
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, Former Borrowing Capacity | $ 350,000,000 |  |
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, Former Borrowing Capacity | $ 45,000,000 |  |
Former credit facilities obtained in 2018 |  |  |
Line of Credit Facility [Line Items] |  |  |
Debt instrument, spread above LIBOR variable rate (in basis points) | 100 |  |
Line of credit, facility fee (in basis points) | 20 |  |
Debt Instrument, Maturity Date, Description | July 30, 2022 |  |

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