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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Common Stock Repurchase Program (Details)	12 Months Ended
	Dec. 31, 2019 USD ($) unitholder shares	Dec. 31, 2018 USD ($) unitholder shares	Dec. 31, 2017 USD ($) unitholder shares
Class Of Stock [Line Items]
Value of redemption of units | $	$ 96,000	$ 2,246,000	$ 656,000
Number of holders of common units who received cash for their units (unitholder) | unitholder		2	5
Redeemable noncontrolling interest, units exercised for conversion (shares)	72,592	526,510	84,014
Operating Partnership
Class Of Stock [Line Items]
Number of holders of common units who received cash for their units (unitholder) | unitholder	2
Redeemable noncontrolling interest, units exercised for conversion (shares)	611,847	915,338
Redeemable noncontrolling interest, shares issued upon exercise of common units (shares)	611,847	915,338

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Redeemable Noncontrolling Interest, Units Exercised for Conversion

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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