Business Segments - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Real estate rental operations:
Revenue	$ 56,237	$ 53,233	$ 170,610	$ 162,869
Expenses	(14,304)	(13,271)	(41,269)	(40,213)
Income from real estate	41,933	39,962	129,341	122,656
Interest expense and amortization of deferred debt costs	(11,821)	(11,524)	(35,585)	(34,268)
General and administrative	(4,363)	(4,033)	(13,178)	(12,500)
Acquisition related costs	0	(57)	0	(57)
Subtotal	25,749	24,348	80,578	75,831
Depreciation and amortization of deferred leasing costs	(11,363)	(11,626)	(34,396)	(33,478)
Change in fair value of derivatives	(1)	1	(2)	(9)
Net income (loss)	14,385	12,723	46,180	42,344
Capital investment	11,664	18,253	106,174	44,685
Total assets	1,423,728	1,311,004	1,423,728	1,311,004	$ 1,343,025
Operating Segments | Shopping Centers
Real estate rental operations:
Revenue	40,834	38,738	124,854	120,861
Expenses	(8,799)	(8,330)	(25,876)	(26,519)
Income from real estate	32,035	30,408	98,978	94,342
Interest expense and amortization of deferred debt costs	0	0	0	0
General and administrative	0	0	0	0
Acquisition related costs		(57)		(57)
Subtotal	32,035	30,351	98,978	94,285
Depreciation and amortization of deferred leasing costs	(7,457)	(7,732)	(22,649)	(22,774)
Change in fair value of derivatives	0	0	0	0
Net income (loss)	24,578	22,619	76,329	71,511
Capital investment	3,503	13,854	87,788	20,258
Total assets	983,369	938,124	983,369	938,124
Operating Segments | Mixed-Use Properties
Real estate rental operations:
Revenue	15,395	14,484	45,725	41,972
Expenses	(5,505)	(4,941)	(15,393)	(13,694)
Income from real estate	9,890	9,543	30,332	28,278
Interest expense and amortization of deferred debt costs	0	0	0	0
General and administrative	0	0	0	0
Acquisition related costs		0		0
Subtotal	9,890	9,543	30,332	28,278
Depreciation and amortization of deferred leasing costs	(3,906)	(3,894)	(11,747)	(10,704)
Change in fair value of derivatives	0	0	0	0
Net income (loss)	5,984	5,649	18,585	17,574
Capital investment	8,161	4,399	18,386	24,427
Total assets	431,182	363,439	431,182	363,439
Corporate and Other
Real estate rental operations:
Revenue	8	11	31	36
Expenses	0	0	0	0
Income from real estate	8	11	31	36
Interest expense and amortization of deferred debt costs	(11,821)	(11,524)	(35,585)	(34,268)
General and administrative	(4,363)	(4,033)	(13,178)	(12,500)
Acquisition related costs		0		0
Subtotal	(16,176)	(15,546)	(48,732)	(46,732)
Depreciation and amortization of deferred leasing costs	0	0	0	0
Change in fair value of derivatives	(1)	1	(2)	(9)
Net income (loss)	(16,177)	(15,545)	(48,734)	(46,741)
Capital investment	0	0	0	0
Total assets	$ 9,177	$ 9,441	$ 9,177	$ 9,441