SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL (Common Stock and Common Units) (Details) - $ / shares	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Operating Partnership
Shareholders Equity [Line Items]
Common units outstanding (in shares)	199,297,151	199,085,032
Operating Partnership \| Common Units
Shareholders Equity [Line Items]
Noncontrolling interest conversion, calculation of trailing average of trading price, term (days)	5 days
Common Stock
Shareholders Equity [Line Items]
Common stock, shares authorized (in shares)	350,000,000
Common stock, par value (in dollars per share)	$ 0.01
Common stock, shares outstanding (in shares)	171,088,778	170,792,645

Noncontrolling Interest Conversion, Calculation of Trailing Average of Trading Price, Term

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Shareholders Equity [Line Items]

+ References

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644

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The number of limited partner units outstanding.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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