SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Common Stock Repurchase Program (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 unitholder shares	Dec. 31, 2019 USD ($) unitholder shares	Dec. 31, 2018 USD ($) unitholder shares
Class Of Stock [Line Items]
Value of redemption of units | $		$ 96	$ 2,246
Number of holders of common units who received cash for their units (unitholder) | unitholder		1	2
Redeemable noncontrolling interest, units exercised for conversion (shares)		72,592	526,510
Operating Partnership
Class Of Stock [Line Items]
Number of holders of common units who received cash for their units (unitholder) | unitholder	31	2	1
Redeemable noncontrolling interest, units exercised for conversion (shares)	20,956,110	611,847	915,338
Redeemable noncontrolling interest, shares issued upon exercise of common units (shares)	20,956,110	611,847	915,338