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UNSECURED BANK CREDIT FACILITIES (Details) | 12 Months Ended
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Dec. 31, 2020 USD ($) Integer | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Line of Credit Facility [Line Items] |  |  |
Unsecured bank credit facilities | $ 124,194,000 | $ 111,394,000 |
Average bank borrowings | $ 87,095,000 | $ 172,175,000 | $ 141,223,000
Weighted average interest rates (in hundredths) | 1.86% | 3.34% | 2.64%
Amortization of facility fees | $ 790,000 | $ 790,000 | $ 736,000
Amortization of bank loan costs | 561,000 | $ 556,000 | $ 508,000
Bank credit facility obtained in 2018 - $350 million [Member] | Nine bank group unsecured revolving credit facility [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 350,000,000 |  |
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 |  |
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 | 1.152% |  |
Unsecured bank credit facilities - variable rate, carrying amount | $ 125,000,000 |  |
Letters of Credit Outstanding, Amount | 674,000 |  |
Expansion option on credit facility | 150,000,000 |  |
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, Current Borrowing Capacity | $ 45,000,000 |  |
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 |  |
Credit facility, extension option | two six-month extensions |  |
Line of Credit Facility, Interest Rate at Period End | 1.144% |  |
Unsecured bank credit facilities - variable rate, carrying amount | $ 0 |  |

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- Definition Including the current and noncurrent portions, the carrying value as of the balance sheet date of notes payable to banks, excluding mortgage notes, initially due beyond one year or beyond the operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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