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DEBT (Details) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 USD ($) Integer | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($)
Secured and Unsecured Debt [Line Items] |  |  |  |
Proceeds from unsecured bank credit facilities |  | $ 216,672,000 | $ 193,658,000 |
Repayments of Bank Debt |  | 233,989,000 | $ 217,640,000 |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Secured Debt |  | 194,069,000 |  | $ 199,512,000
Unsecured Debt |  | 723,171,000 |  | 713,061,000
Unsecured bank credit facilities |  | 176,958,000 |  | 195,709,000
Total debt |  | 1,094,198,000 |  | 1,108,282,000
Secured and unsecured debt [Member] |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Remainder of Fiscal Year |  | 5,730,000 |  |
Payments of principal over future years [Abstract] |  |  |  |
2019 |  | 130,569,000 |  |
2020 |  | 114,096,000 |  |
2021 |  | 129,563,000 |  |
2022 |  | 107,769,000 |  |
2023 and beyond |  | 432,043,000 |  |
Long-term debt, maturities, secured debt and unsecured debt |  | 919,770,000 |  |
Unsecured bank credit facilities |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Unsecured bank credit facilities - variable rate, carrying amount |  | 99,022,000 |  | 116,339,000
Unsecured bank credit facilities - fixed rate, carrying amount | [1],[2] | 80,000,000 |  | 80,000,000
Unamortized debt issuance costs |  | (2,064,000) |  | (630,000)
Unsecured bank credit facilities |  | 176,958,000 |  | 195,709,000
Unsecured Debt [Member] |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Unsecured debt, carrying amount | [2] | 725,000,000 |  | 715,000,000
Unamortized debt issuance costs |  | (1,829,000) |  | (1,939,000)
Unsecured Debt |  | 723,171,000 |  | 713,061,000
Secured Debt [Member] |  |  |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Secured debt, carrying amount | [2] | 194,770,000 |  | 200,354,000
Unamortized debt issuance costs |  | (701,000) |  | (842,000)
Secured Debt |  | $ 194,069,000 |  | $ 199,512,000
Nine bank group unsecured revolving credit facility [Member] | Debt with effectively fixed interest rate [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 2.02% |  |
Debt Instrument, Maturity Date, Description |  | 8/15/2018 |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Unsecured bank credit facilities |  | $ 80,000,000 |  |
Nine bank group unsecured revolving credit facility [Member] | Former facility - $300 million [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 300,000,000 |  |
Debt instrument, basis spread about LIBOR variable rate |  | 100 |  |
Line of credit, facility fee (in basis points) |  | 20 |  |
Debt Instrument, Maturity Date, Description |  | Jul. 30, 2019 |  |
Nine bank group unsecured revolving credit facility [Member] | Bank credit facility obtained in 2018 - $350 million [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 3.091% |  |
Letters of Credit Outstanding, Amount |  | $ 674,000 |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 350,000,000 |  |
Number of banks included in the unsecured revolving credit facility | Integer |  | 9 |  |
Debt instrument, basis spread about LIBOR variable rate |  | 100 |  |
Line of credit, facility fee (in basis points) |  | 20 |  |
Debt Instrument, Maturity Date, Description |  | Jul. 30, 2022 |  |
Date new or modified debt was executed |  | Jun. 14, 2018 |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Unsecured bank credit facilities - variable rate, carrying amount |  | $ 80,000,000 |  |
Payments of principal over future years [Abstract] |  |  |  |
Extension option on credit facility |  | two six-month extensions |  |
Expansion option on credit facility |  | $ 150,000,000 |  |
Pnc Na Unsecured revolving credit facility [Member] | Former credit facility - $35 million [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 35,000,000 |  |
Pnc Na Unsecured revolving credit facility [Member] | Credit facility obtained in 2018 - $45 million [Member] |  |  |  |
Secured and Unsecured Debt [Line Items] |  |  |  |
Line of Credit Facility, Interest Rate at Period End |  | 3.09% |  |
Line of Credit Facility, Current Borrowing Capacity |  | $ 45,000,000 |  |
Debt instrument, basis spread about LIBOR variable rate |  | 100 |  |
Line of credit, facility fee (in basis points) |  | 20 |  |
Debt Instrument, Maturity Date, Description |  | Jul. 30, 2022 |  |
Date new or modified debt was executed |  | Jun. 14, 2018 |  |
Loans Payable, Noncurrent [Abstract] |  |  |  |
Unsecured bank credit facilities - variable rate, carrying amount |  | $ 19,022,000 |  |
Payments of principal over future years [Abstract] |  |  |  |
Extension option on credit facility |  | two six-month extensions |  |
[1] | The Company has designated an interest rate swap to an $80 million unsecured bank credit facility draw that effectively fixes the interest rate on the $80 million draw to 2.020% through the interest rate swap's maturity date of August 15, 2018.
[2] | These loans have a fixed interest rate or an effectively fixed interest rate due to interest rate swaps.

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