INTANGIBLES (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Intangible assets:
Lease intangible assets	$ 1,212,263	$ 1,230,886
Goodwill	1,051,780	1,051,650
Accumulated amortization	(940,053)	(941,462)
Net intangible assets	$ 1,359,883	$ 1,376,944
Finite-lived intangible assets, remaining amortization period	10 years 4 months 24 days	10 years 3 months 18 days
Intangible liabilities:
Below market lease intangibles	$ 337,902	$ 339,265
Other lease intangibles	13,498	13,498
Accumulated amortization	(215,001)	(212,655)
Purchase option intangibles	3,568	3,568
Net intangible liabilities	$ 139,967	$ 143,676
Below market leases, remaining weighted average amortization period (in years)	14 years 2 months 12 days	14 years 3 months 18 days
Net intangible liabilities, remaining weighted average amortization period (in years)	14 years 2 months 12 days	14 years 3 months 18 days
Above Market Lease Intangibles
Intangible assets:
Lease intangible assets	$ 138,469	$ 140,096
Finite-lived intangible assets, remaining amortization period	6 years 3 months 18 days	6 years 4 months 24 days
In-place and Other Lease Intangibles
Intangible assets:
Lease intangible assets	$ 1,073,794	$ 1,090,790
Finite-lived intangible assets, remaining amortization period	10 years 9 months 18 days	10 years 8 months 12 days
Other Intangibles
Intangible assets:
Other intangibles	$ 35,893	$ 35,870
Finite-lived intangible assets, remaining amortization period	9 years 9 months 18 days	10 years