USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Components of Balance Sheet (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Balance sheet-related [Abstract]
Swap agreements in a loss position (a liability) related to unsecured borrowings		$ (29,156)	$ (17,834)
Interest rate swap agreements at fair value, net assets (liability)		(28,122)	(18,206)
Swap agreements in a gain position (an asset) related to secured borrowings		1,471
Interest Rate Swap Agreements at Fair Value [Member] | Eurodollar Futures Contract [Member]
Balance sheet-related [Abstract]
Swap agreements in a gain position (an asset) related to secured borrowings		738
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 secured borrowings		733
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 unsecured borrowings	[1]	(29,156)	(17,834)
Accounts Payable and Accrued Liabilities [Member]
Balance sheet-related [Abstract]
Related net interest payable	[2]	$ (437)	$ (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.

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