Business Segments - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Real estate rental operations:
Revenue	$ 59,750	$ 56,108
Income from real estate	44,601	42,140
Interest expense and amortization of deferred debt costs	(11,067)	(11,424)
Depreciation and amortization of deferred leasing costs	(11,643)	(11,349)
General and administrative	(4,814)	(4,420)
Net income	17,077	14,947
Capital investment	23,423	16,723
Total assets	1,545,828	1,429,147	$ 1,527,489
Operating Segments | Shopping Centers
Real estate rental operations:
Revenue	43,159	40,924
Income from real estate	33,471	32,047
Interest expense and amortization of deferred debt costs	0	0
Depreciation and amortization of deferred leasing costs	(7,282)	(7,298)
General and administrative	0	0
Net income	26,189	24,749
Capital investment	4,613	3,260
Total assets	968,674	971,596
Operating Segments | Mixed-Use Properties
Real estate rental operations:
Revenue	16,591	15,184
Income from real estate	11,130	10,093
Interest expense and amortization of deferred debt costs	0	0
Depreciation and amortization of deferred leasing costs	(4,361)	(4,051)
General and administrative	0	0
Net income	6,769	6,042
Capital investment	18,810	13,463
Total assets	566,163	448,970
Corporate and Other
Real estate rental operations:
Revenue	0	0
Income from real estate	0	0
Interest expense and amortization of deferred debt costs	(11,067)	(11,424)
Depreciation and amortization of deferred leasing costs	0	0
General and administrative	(4,814)	(4,420)
Net income	(15,881)	(15,844)
Capital investment	0	0
Total assets	10,991	8,581
Real Estate
Real estate rental operations:
Expenses	(15,149)	(13,968)
Real Estate | Operating Segments | Shopping Centers
Real estate rental operations:
Expenses	(9,688)	(8,877)
Real Estate | Operating Segments | Mixed-Use Properties
Real estate rental operations:
Expenses	(5,461)	(5,091)
Real Estate | Corporate and Other
Real estate rental operations:
Expenses	$ 0	$ 0