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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. 16, 2018	Oct. 16, 2017	Jul. 17, 2017	Apr. 17, 2017	Jan. 16, 2017	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Shareholders Equity [Line Items]
Common stock cash dividends per share (in dollars per share)		$ 0.265	$ 0.265	$ 0.265	$ 0.265
Accrued dividends and distributions payable						$ 34,217	$ 45,259
Subsequent Event
Shareholders Equity [Line Items]
Common stock cash dividends per share (in dollars per share)	$ 0.20
Tax Year 2018 | Subsequent Event
Shareholders Equity [Line Items]
Common stock cash dividends per share (in dollars per share)	$ 0.20
Tax Year 2016
Shareholders Equity [Line Items]
Common stock cash dividends per share (in dollars per share)					0.081
Tax Year 2017
Shareholders Equity [Line Items]
Common stock cash dividends per share (in dollars per share)					$ 0.184
Common Stock
Shareholders Equity [Line Items]
Dividends declared (in dollars per share)						$ 0.97970004	$ 0.876	$ 1.06
Allocations						100.00%	100.00%	100.00%
Common Stock | Ordinary income
Shareholders Equity [Line Items]
Allocations						85.374%	100.00%	100.00%
Common Stock | Capital gains 25% rate
Shareholders Equity [Line Items]
Allocations						0.00%	0.00%	0.00%
Common Stock | Return of capital
Shareholders Equity [Line Items]
Allocations						14.626%	0.00%	0.00%
Series D preferred stock
Shareholders Equity [Line Items]
Dividends declared (in dollars per share)						$ 18.4375	$ 18.4375	$ 18.4375
Series E preferred stock
Shareholders Equity [Line Items]
Dividends declared (in dollars per share)						$ 16.562500	$ 16.562500	$ 16.562500
Preferred Stock
Shareholders Equity [Line Items]
Allocations						100.00%	100.00%	100.00%
Preferred Stock | Ordinary income
Shareholders Equity [Line Items]
Allocations						100.00%	100.00%	100.00%
Preferred Stock | Capital gains 25% rate
Shareholders Equity [Line Items]
Allocations						0.00%	0.00%	0.00%

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Percentage of Allocation of Dividends Declared and Paid

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Shareholders Equity [Line Items]

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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(5))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Name Accounting Standards Codification
-Topic 210
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-Name Accounting Standards Codification
-Topic 210
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