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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL (Allocations of Dividends and Declared and Paid For Income Tax Purposes) (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Jan. 15, 2015	Oct. 15, 2014	Jul. 15, 2014	Apr. 16, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shareholders Equity [Line Items]
Common stock cash dividends per share (in dollars per share)	$ 0.265	$ 0.265	$ 0.265	$ 0.265
Dividends payable					$ 45,179	$ 45,119
Common Stock
Shareholders Equity [Line Items]
Dividends declared (in usd per share)					$ 1.06	$ 1.00	$ 0.98
Allocations (percent)					100.00%	100.00%	100.00%
Common Stock | Ordinary income
Shareholders Equity [Line Items]
Allocations (percent)					100.00%	100.00%	100.00%
Common Stock | Capital gains 25% rate
Shareholders Equity [Line Items]
Allocations (percent)					0.00%	0.00%	0.00%
Common Stock | Return of capital
Shareholders Equity [Line Items]
Allocations (percent)					0.00%	0.00%	0.00%
Series D preferred stock
Shareholders Equity [Line Items]
Dividends declared (in usd per share)					$ 18.44	$ 18.44	$ 18.44
Series E preferred stock
Shareholders Equity [Line Items]
Dividends declared (in usd per share)					$ 16.56	$ 16.56	$ 16.56
Preferred Stock
Shareholders Equity [Line Items]
Allocations (percent)					100.00%	100.00%	100.00%
Preferred Stock | Ordinary income
Shareholders Equity [Line Items]
Allocations (percent)					100.00%	100.00%	100.00%
Preferred Stock | Capital gains 25% rate
Shareholders Equity [Line Items]
Allocations (percent)					0.00%	0.00%	0.00%

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Allocation of Dividends Declared and Paid

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Percentage of Allocation of Dividends Declared and Paid

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Shareholders Equity [Line Items]

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- Definition

Aggregate dividends paid during the period for each share of common stock outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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Carrying value as of the balance sheet date of dividends declared but unpaid on equity securities issued by the entity and outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.15(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 15
-Subparagraph a
-Article 7

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