USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT - Schedule of Offsetting of Derivative Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Offsetting of derivative assets [Abstract]
Gross Amounts of Recognized Assets		$ 1,267
Net Amounts of Assets Presented in the Balance Sheet		35,164	$ 18,206
Offsetting Derivatives Assets [Member] | Counterparty 4 [Member]
Offsetting of derivative assets [Abstract]
Gross Amounts of Recognized Assets	[1]	5,726	26,787
Gross Amounts Offset in the Balance Sheet	[1]	(4,459)	(26,787)
Net Amounts of Assets Presented in the Balance Sheet		1,267	0
Financial Instruments	[2]	0	0
Cash Collateral Received	[2]	0	0
Net Amount		$ 1,267	$ 0

[1] Included in gross amounts of recognized assets at September 30, 2019 are the fair value of exchange-traded swap agreements, calculated including accrued interest, and the fair value of Eurodollar futures contracts.  Included in gross amounts offset in the balance sheet are variation margin amounts associated with exchange-traded swaps at September 30, 2019.

[2] Amounts presented are limited to recognized liabilities and cash collateral received associated with the indicated counterparty sufficient to reduce the related Net Amount to zero in accordance with ASU No. 2011-11, as amended by ASU No. 2013-01.