INTANGIBLE LEASE ASSETS AND LIABILITIES (Components) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Intangible lease assets:
Intangible leased assets	$ 181,906	$ 182,147
Intangible lease liabilities:
Below market leases net of amortization	20,161	20,523
Below market lease, accumulated amortization	$ 30,237	25,800
Below market lease, weighted average useful life	7 years		7 years 3 months 18 days
In-place leases and other intangibles
Intangible lease assets:
Intangible leased assets	$ 164,232	164,724
Accumulated amortization	$ 124,103	$ 111,670
Useful life	10 years	10 years 4 months 24 days
Acquired above-market leases
Intangible lease assets:
Intangible leased assets	$ 17,674	$ 17,423
Accumulated amortization	$ 22,040	$ 19,310
Useful life	7 years 6 months	7 years 10 months 24 days