USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT- Offsetting Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Offsetting of derivative assets [Abstract]
Gross Amounts of Recognized Assets		$ 7,720	$ 1,657
Net Amounts of Assets Presented in the Balance Sheet		(29,283)	(34,893)
Cash Collateral Received		50,193	53,139
Offsetting Derivatives Assets [Member] | Counterparty 2 [Member]
Offsetting of derivative assets [Abstract]
Gross Amounts of Recognized Assets		0	0
Gross Amounts Offset in the Balance Sheet		23	95
Net Amounts of Assets Presented in the Balance Sheet		23	95
Financial Instruments	[1]	(23)	(95)
Cash Collateral Received	[1]	0	0
Net Amount		0	0
Offsetting Derivatives Assets [Member] | Counterparty 4 [Member]
Offsetting of derivative assets [Abstract]
Gross Amounts of Recognized Assets		4,758	1,128
Gross Amounts Offset in the Balance Sheet		2,939	434
Net Amounts of Assets Presented in the Balance Sheet		7,697	1,562
Financial Instruments	[1]	(7,697)	(1,562)
Cash Collateral Received	[1]	0	0
Net Amount		0	0
Offsetting Derivatives Assets [Member] | Derivative Counterparties [Member]
Offsetting of derivative assets [Abstract]
Gross Amounts of Recognized Assets		4,758	1,128
Gross Amounts Offset in the Balance Sheet		2,962	529
Net Amounts of Assets Presented in the Balance Sheet		7,720	1,657
Financial Instruments	[1]	(7,720)	(1,657)
Cash Collateral Received	[1]	0	0
Net Amount		$ 0	$ 0

[1] 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.