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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Common Stock Repurchase Program (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) unitholder shares	Dec. 31, 2017 USD ($) unitholder shares	Dec. 31, 2016 USD ($) unitholder shares
Class of Stock [Line Items]
Value of redemption of units | $	$ 2,246	$ 656	$ 11,754
Number of holders of common units who received cash for their units (unitholder) | unitholder	2	5	4
Redeemable noncontrolling interest, units exercised for conversion (shares)	526,510	84,014	964,796
Operating Partnership
Class of Stock [Line Items]
Redeemable noncontrolling interest, units exercised for conversion (shares)	915,338
Redeemable noncontrolling interest, shares issued upon exercise of common units (shares)	915,338

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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))
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