USE OF DERIVATIVE FINANCIAL INSTRUMENTS, OFFSETTING DISCLOSURES AND CHANGES IN OTHER COMPREHENSIVE INCOME BY COMPONENT, Offsetting Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	$ 27,034		$ 11,304
Offsetting Financial Liabilities and Derivative Liabilities [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	12,848,968	[1]	12,504,401	[1]
Gross Amounts Offset in the Balance Sheet	529		0
Net Amounts of Liabilities Presented in the Balance Sheet	12,849,497	[2]	12,504,401	[2]
Financial Instruments	(12,814,604)	[3]	(12,492,609)	[3]
Cash Collateral Pledged	(34,893)	[3]	(11,792)	[3]
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	24,533	[1]	6,002	[1]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	24,533	[2]	6,002	[2]
Financial Instruments	0	[3]	(3,911)	[3]
Cash Collateral Pledged	(24,533)	[3]	(2,091)	[3]
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	4,042	[1]	6,352	[1]
Gross Amounts Offset in the Balance Sheet	95		0
Net Amounts of Liabilities Presented in the Balance Sheet	4,137	[2]	6,352	[2]
Financial Instruments	(95)	[3]	(634)	[3]
Cash Collateral Pledged	(4,042)	[3]	(5,718)	[3]
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	736	[1]	1,581	[1]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	736	[2]	1,581	[2]
Financial Instruments	0	[3]	0	[3]
Cash Collateral Pledged	(736)	[3]	(1,581)	[3]
Net Amount	0		0
Offsetting Financial Liabilities and Derivative Liabilities [Member] | Counterparty 4 [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	6,710	[1]	2,862	[1]
Gross Amounts Offset in the Balance Sheet	434		0
Net Amounts of Liabilities Presented in the Balance Sheet	7,144	[2]	2,862	[2]
Financial Instruments	(1,562)	[3]	(460)	[3]
Cash Collateral Pledged	(5,582)	[3]	(2,402)	[3]
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	36,021	[1]	16,797	[1]
Gross Amounts Offset in the Balance Sheet	529		0
Net Amounts of Liabilities Presented in the Balance Sheet	36,550	[2]	16,797	[2]
Financial Instruments	(1,657)	[3]	(5,005)	[3]
Cash Collateral Pledged	(34,893)	[3]	(11,792)	[3]
Repurchase Arrangements and Similar Borrowings [Member] | Offsetting Financial Liabilities and Derivative Liabilities [Member]
Offsetting of financial liabilities and derivative liabilities [Abstract]
Gross Amounts of Recognized Liabilities	12,812,947	[1]	12,487,604	[1]
Gross Amounts Offset in the Balance Sheet	0		0
Net Amounts of Liabilities Presented in the Balance Sheet	12,812,947	[2]	12,487,604	[2]
Financial Instruments	(12,812,947)	[3]	(12,487,604)	[3]
Cash Collateral Pledged	0	[3]	0	[3]
Net Amount	$ 0		$ 0

[1] Amounts include accrued interest of $9.5 million and $5.5 million on interest rate swap agreements and $6.1 million and $4.7 million on repurchase arrangements and similar borrowings, included in "Accounts payable and accrued expenses" on the face of the Balance Sheets as of December 31, 2014 and December 31, 2013, 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.