Business Segments - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Real estate rental operations:
Revenue	$ 60,256			$ 56,760			$ 178,985	$ 166,923
Expenses	(15,364)			(14,939)			(46,541)	(42,889)
Income from real estate	44,892			41,821			132,444	124,034
Interest expense, net and amortization of deferred debt costs	(10,914)			(12,398)			(34,559)	(34,011)
Depreciation and amortization of lease costs	(12,467)			(13,713)			(37,852)	(37,593)
General and administrative	(4,626)			(4,107)			(14,234)	(13,790)
Net Income	16,885	$ 16,119	$ 12,795	11,603	$ 10,208	$ 16,829	45,799	38,640
Capital investment	11,351			9,436			38,831	48,363
Total assets	1,739,500			1,681,374			1,739,500	1,681,374	$ 1,645,572
Operating Segments | Shopping Centers
Real estate rental operations:
Revenue	42,485			40,336			126,935	120,236
Expenses	(8,640)			(8,755)			(27,087)	(26,041)
Income from real estate	33,845			31,581			99,848	94,195
Interest expense, net and amortization of deferred debt costs	0			0			0	0
Depreciation and amortization of lease costs	(7,203)			(8,169)			(21,639)	(22,812)
General and administrative	0			0			0	0
Net Income	26,642			23,412			78,209	71,383
Capital investment	2,629			2,733			8,200	11,622
Total assets	960,247			982,381			960,247	982,381
Operating Segments | Mixed-Use Properties
Real estate rental operations:
Revenue	17,771			16,424			52,050	46,687
Expenses	(6,724)			(6,184)			(19,454)	(16,848)
Income from real estate	11,047			10,240			32,596	29,839
Interest expense, net and amortization of deferred debt costs	0			0			0	0
Depreciation and amortization of lease costs	(5,264)			(5,544)			(16,213)	(14,781)
General and administrative	0			0			0	0
Net Income	5,783			4,696			16,383	15,058
Capital investment	8,722			6,703			30,631	36,741
Total assets	766,761			643,395			766,761	643,395
Corporate and Other
Real estate rental operations:
Revenue	0			0			0	0
Expenses	0			0			0	0
Income from real estate	0			0			0	0
Interest expense, net and amortization of deferred debt costs	(10,914)			(12,398)			(34,559)	(34,011)
Depreciation and amortization of lease costs	0			0			0	0
General and administrative	(4,626)			(4,107)			(14,234)	(13,790)
Net Income	(15,540)			(16,505)			(48,793)	(47,801)
Capital investment	0			0			0	0
Total assets	$ 12,492			$ 55,598			$ 12,492	$ 55,598