USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Components of Balance Sheet (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Balance sheet-related [Abstract]
Swap agreements in a loss position (a liability) related to borrowings		$ (46,529)	$ (29,156)
Interest rate swap agreements at fair value, net assets (liability)		(47,629)	(28,122)
Swap agreements in a gain position (an asset) related to borrowing			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 borrowing	[1]		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 borrowing	[1]		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 borrowings	[1]	(46,529)	(29,156)
Accounts Payable and Accrued Liabilities [Member]
Balance sheet-related [Abstract]
Related net interest payable	[2]	$ (1,100)	$ (437)

[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.