Revenues (Schedule of Rent Revenues) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues [Abstract]
Base rents	$ 95,987,000	$ 105,041,000	$ 107,630,000
Expense recoveries	29,241,000	33,475,000	33,378,000
Percentage rent	1,778,000	971,000	725,000
Straight-line rents	(1,208,000)	405,000	1,142,000
Amortization of intangible lease liabilities, net	1,373,000	2,827,000	4,361,000
Total rents	$ 127,171,000	$ 142,719,000	$ 147,236,000