USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Components of Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Balance sheet-related [Abstract]
Swap agreements in a loss position (a liability) related to borrowings		$ (17,834)	$ (23,772)
Interest rate swap agreements at fair value, net assets (liability)		(18,206)	(24,256)
Accounts Payable and Accrued Liabilities [Member]
Balance sheet-related [Abstract]
Related net interest payable	[1]	(373)	(484)
Interest Rate Swap Agreements at Fair Value [Member] | Unsecured Borrowings [Member]
Balance sheet-related [Abstract]
Swap agreements in a loss position (a liability) related to borrowings	[2]	$ (17,834)	$ (23,772)

[1] Included in “Accounts payable and accrued expenses” on the face of the Balance Sheets.

[2] The fair value of Derivatives with unrealized gains are aggregated and recorded as an asset on the face of the Balance Sheets separately from the fair value of Derivatives with unrealized losses that are recorded as a liability.