USE OF DERIVATIVES, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT- Offsetting Liabilities (Details) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities		$ 26,061	$ 27,034
Offsetting Financial Liabilities and Derivative Liabilities [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	[1]	10,124,887	12,848,968
Gross Amounts Offset in the Balance Sheet		2,962	529
Net Amounts of Liabilities Presented in the Balance Sheet	[2]	10,127,849	12,849,497
Financial Instruments	[3]	(10,098,566)	(12,814,604)
Cash Collateral Pledged	[3]	(29,283)	(34,893)
Net Amount		0	0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 1 [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	[1]	26,311	24,533
Gross Amounts Offset in the Balance Sheet		0	0
Net Amounts of Liabilities Presented in the Balance Sheet	[2]	26,311	24,533
Financial Instruments	[3]	0	0
Cash Collateral Pledged	[3]	(26,311)	(24,533)
Net Amount		0	0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 2 [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	[1]	776	4,042
Gross Amounts Offset in the Balance Sheet		23	95
Net Amounts of Liabilities Presented in the Balance Sheet	[2]	799	4,137
Financial Instruments	[3]	(23)	(95)
Cash Collateral Pledged	[3]	(776)	(4,042)
Net Amount		0	0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 3 [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	[1]		736
Gross Amounts Offset in the Balance Sheet			0
Net Amounts of Liabilities Presented in the Balance Sheet	[2]		736
Financial Instruments	[3]		0
Cash Collateral Pledged	[3]		(736)
Net Amount			0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 4 [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	[1]	6,954	6,710
Gross Amounts Offset in the Balance Sheet		2,939	434
Net Amounts of Liabilities Presented in the Balance Sheet	[2]	9,893	7,144
Financial Instruments	[3]	(7,697)	(1,562)
Cash Collateral Pledged	[3]	(2,196)	(5,582)
Net Amount		0	0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Derivative Counterparties [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	[1]	34,041	36,021
Gross Amounts Offset in the Balance Sheet		2,962	529
Net Amounts of Liabilities Presented in the Balance Sheet	[2]	37,003	36,550
Financial Instruments	[3]	(7,720)	(1,657)
Cash Collateral Pledged	[3]	(29,283)	(34,893)
Net Amount		0	0
Borrowings under Repurchase Arrangements [Member] | Offsetting Financial Liabilities and Derivative Liabilities [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	[1]	10,090,846	12,812,947
Gross Amounts Offset in the Balance Sheet		0	0
Net Amounts of Liabilities Presented in the Balance Sheet	[2]	10,090,846	12,812,947
Financial Instruments	[3]	(10,090,846)	(12,812,947)
Cash Collateral Pledged	[3]	0	0
Net Amount		$ 0	$ 0

[1] Amounts include accrued interest of $10.9 million and $9.5 million on interest rate swap agreements and $9.3 million and $6.1 million on borrowings under repurchase arrangements, included in "Accounts payable and accrued expenses" on the face of the Balance Sheets as of December 31, 2015 and December 31, 2014, respectively.

[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.

[3] Amounts presented are limited to recognized assets and collateral pledged 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.