Business Segments - Schedule of Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Real estate rental operations:
Revenue	$ 56,926	$ 52,088
Expenses	(14,361)	(13,763)
Income from real estate	42,565	38,325
Interest expense and amortization of deferred debt costs	(11,089)	(11,406)
General and administrative	(4,060)	(3,771)
Acquisition related costs	0	(21)
Subtotal	27,416	23,127
Depreciation and amortization of deferred leasing costs	(11,035)	(10,440)
Change in fair value of derivatives	(7)	(6)
Net income (loss)	16,374	12,681
Capital investment	12,984	10,624
Total assets	1,301,635	1,270,611	$ 1,295,408
Operating Segments | Shopping Centers
Real estate rental operations:
Revenue	43,446	39,364
Expenses	(10,154)	(9,536)
Income from real estate	33,292	29,828
Interest expense and amortization of deferred debt costs	0	0
General and administrative	0	0
Acquisition related costs		(21)
Subtotal	33,292	29,807
Depreciation and amortization of deferred leasing costs	(7,868)	(7,316)
Change in fair value of derivatives	0	0
Net income (loss)	25,424	22,491
Capital investment	2,113	2,946
Total assets	920,351	937,619
Operating Segments | Mixed-Use Properties
Real estate rental operations:
Revenue	13,467	12,711
Expenses	(4,207)	(4,227)
Income from real estate	9,260	8,484
Interest expense and amortization of deferred debt costs	0	0
General and administrative	0	0
Acquisition related costs		0
Subtotal	9,260	8,484
Depreciation and amortization of deferred leasing costs	(3,167)	(3,124)
Change in fair value of derivatives	0	0
Net income (loss)	6,093	5,360
Capital investment	10,871	7,678
Total assets	363,993	312,311
Corporate and Other | Corporate and Other
Real estate rental operations:
Revenue	13	13
Expenses	0	0
Income from real estate	13	13
Interest expense and amortization of deferred debt costs	(11,089)	(11,406)
General and administrative	(4,060)	(3,771)
Acquisition related costs		0
Subtotal	(15,136)	(15,164)
Depreciation and amortization of deferred leasing costs	0	0
Change in fair value of derivatives	(7)	(6)
Net income (loss)	(15,143)	(15,170)
Capital investment	0	0
Total assets	$ 17,291	$ 20,681