Business Segments - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Real estate rental operations:
Revenue	$ 52,376	$ 50,595	$ 156,175	$ 155,828
Expenses	(12,862)	(12,080)	(39,111)	(37,150)
Income from real estate	39,514	38,515	117,064	118,678
Interest expense and amortization of deferred debt costs	(11,229)	(11,584)	(33,988)	(34,537)
General and administrative	(3,802)	(3,837)	(11,712)	(12,540)
Acquisition related costs	(57)	(359)	(78)	(738)
Predevelopment expenses	(57)		(57)	(503)
Subtotal	24,369	22,735	71,229	70,360
Depreciation and amortization of deferred leasing costs	(11,131)	(10,256)	(32,382)	(30,745)
Gain on sale of property	0	0	11	6,069
Change in fair value of derivatives	(6)	1	(12)	(6)
Net Income	13,232	12,480	38,846	45,678
Capital investment	24,336	37,567	49,913	69,912
Total assets	1,296,950	1,258,528	1,296,950	1,258,528	$ 1,266,987
Mixed-Use Properties
Real estate rental operations:
Predevelopment expenses	0
Corporate and Other
Real estate rental operations:
Predevelopment expenses	0
Operating Segments | Shopping Centers
Real estate rental operations:
Revenue	38,903	37,506	116,567	116,381
Expenses	(8,295)	(8,088)	(25,785)	(25,580)
Income from real estate	30,608	29,418	90,782	90,801
Interest expense and amortization of deferred debt costs	0	0	0	0
General and administrative	0	0	0	0
Acquisition related costs	(57)	(359)	(78)	(738)
Predevelopment expenses	(57)		(57)	0
Subtotal	30,494	29,059	90,647	90,063
Depreciation and amortization of deferred leasing costs	(7,779)	(7,055)	(22,633)	(20,863)
Gain on sale of property			11	6,069
Change in fair value of derivatives	0	0	0	0
Net Income	22,715	22,004	68,025	75,269
Capital investment	7,404	31,541	12,883	55,865
Total assets	941,421	942,441	941,421	942,441
Operating Segments | Mixed-Use Properties
Real estate rental operations:
Revenue	13,462	13,066	39,571	39,389
Expenses	(4,567)	(3,992)	(13,326)	(11,570)
Income from real estate	8,895	9,074	26,245	27,819
Interest expense and amortization of deferred debt costs	0	0	0	0
General and administrative	0	0	0	0
Acquisition related costs	0	0	0	0
Predevelopment expenses			0	(503)
Subtotal	8,895	9,074	26,245	27,316
Depreciation and amortization of deferred leasing costs	(3,352)	(3,201)	(9,749)	(9,882)
Gain on sale of property			0	0
Change in fair value of derivatives	0	0	0	0
Net Income	5,543	5,873	16,496	17,434
Capital investment	16,932	6,026	37,030	14,047
Total assets	340,983	301,043	340,983	301,043
Corporate and Other | Corporate and Other
Real estate rental operations:
Revenue	11	23	37	58
Expenses	0	0	0	0
Income from real estate	11	23	37	58
Interest expense and amortization of deferred debt costs	(11,229)	(11,584)	(33,988)	(34,537)
General and administrative	(3,802)	(3,837)	(11,712)	(12,540)
Acquisition related costs	0	0	0	0
Predevelopment expenses			0	0
Subtotal	(15,020)	(15,398)	(45,663)	(47,019)
Depreciation and amortization of deferred leasing costs	0	0	0	0
Gain on sale of property			0	0
Change in fair value of derivatives	(6)	1	(12)	(6)
Net Income	(15,026)	(15,397)	(45,675)	(47,025)
Capital investment	0	0	0	0
Total assets	$ 14,546	$ 15,044	$ 14,546	$ 15,044