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LEASES - As Lessor - Lease Termination Fees (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Lease Termination Fee
Revenue		$ 20,816,000	$ 21,239,000
Retail tenants
Lease Termination Fee
Payments received upon early lease termination	$ 350,000
Industrial tenants
Lease Termination Fee
Payments received upon early lease termination				$ 88,000
Rental income, net
Lease Termination Fee
Revenue		20,684,000	$ 21,239,000
Lease termination fees
Lease Termination Fee
Revenue		$ 132,000

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The cash inflow attributable to a tenant's early lease termination.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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