Annual report pursuant to Section 13 and 15(d)

INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Operating Information (Details)

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INVESTMENT IN UNCONSOLIDATED REAL ESTATE VENTURES - Condensed Operating Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]      
Total revenues $ 432,222 $ 387,896 $ 330,896
Property operating expenses 123,486 110,347 103,875
Depreciation and amortization (117,174) (105,119) (89,147)
Interest expense (62,595) (56,464) (42,724)
Net income (loss) 48,609 3,983 14,109
Equity Method Investment, Nonconsolidated Investee or Group of Investees | Joint Venture      
Schedule of Equity Method Investments [Line Items]      
Total revenues 164,762 162,827 94,507
Property operating expenses 49,632 49,845 30,229
Net operating income 115,130 112,982 64,278
Supervisory, administrative and other expenses (10,935) (10,818) (6,397)
Depreciation and amortization (61,188) (79,556) (40,930)
Interest expense (41,204) (39,936) (20,718)
Loss on sale of self storage properties 0 (806) (820)
Acquisition costs (969) (1,971) (1,188)
Net income (loss) $ 834 $ (20,105) $ (5,775)