USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Components of Balance Sheet (Details) - USD ($) $ in Thousands		Jun. 30, 2019	Dec. 31, 2018
Balance sheet-related [Abstract]
Swap agreements in a loss position (a liability) related to borrowings		$ (28,284)	$ (17,834)
Interest rate swap agreements at fair value, net assets (liability)		(26,548)	(18,206)
Swap agreements in a gain position (an asset) related to borrowings		2,128
Interest Rate Swap Agreements at Fair Value [Member] | Secured Borrowings [Member]
Balance sheet-related [Abstract]
Swap agreements in a gain position (an asset) related to borrowings	[1]	2,128
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	[1]	(28,284)	(17,834)
Accounts Payable and Accrued Liabilities [Member]
Balance sheet-related [Abstract]
Related net interest payable	[2]	$ (392)	$ (372)

[1] 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.  The amount of unrealized gains, net of unrealized losses, included in Accumulated other comprehensive income (loss) and scheduled to be recognized in the Statements of Operations over the next twelve months primarily in the form of amortization of net unrealized gains on de-designated interest rate swaps and fixed-rate swap payments in excess of current market rates on swaps related to unsecured borrowings totaled $2.9 million at June 30, 2019.

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