Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 52,931	$ 57,988		$ 34,842
Adjustments to reconcile net income to net cash provided by operating activities:
Change in fair value of derivatives	10	10		7
Gains on sales of properties	(11)	(6,069)		0
Gain on casualty settlement	0	0		(77)
Depreciation and amortization of deferred leasing costs	43,270	41,203		49,130
Amortization of deferred debt costs	1,433	1,327		1,257
Non cash compensation costs of stock grants and options	1,434	1,240		1,145
Provision for credit losses	915	680		968
Increase in accounts receivable and accrued income	(5,207)	(3,320)		(3,669)
Additions to deferred leasing costs	(5,563)	(4,048)		(5,876)
Increase in prepaid expenses	(570)	(60)		(152)
(Increase) decrease in other assets	1,535	(694)		353
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(937)	1,149		(3,286)
Decrease in deferred income	(344)	(2,838)		(1,115)
Net cash provided by operating activities	88,896	86,568		73,527
Cash flows from investing activities:
Acquisitions of real estate investments	(4,894)	(57,494)	[1]	(5,124)
Additions to real estate investments	(18,855)	(14,986)		(13,999)
Additions to development and redevelopment projects	(45,870)	(17,788)		(7,316)
Proceeds from sale of properties	32	6,679		0
Proceeds from casualty settlement	0	0		405
Net cash used in investing activities	(69,587)	(83,589)		(26,034)
Cash flows from financing activities:
Proceeds from mortgage notes payable	46,000	0	[1]	101,600
Repayments on mortgage notes payable	(52,963)	(22,071)		(71,308)
Proceeds from construction loans payable	39,817	5,391		0
Proceeds from revolving credit facility	20,000	90,000		142,000
Repayments on revolving credit facility	(35,000)	(47,000)		(180,000)
Additions to deferred debt costs	(296)	(1,264)		(3,219)
Proceeds from the issuance of:
Common stock	15,583	15,596		22,292
Partnership units	5,673	8,877		4,144
Preferred stock redemption costs	0	0		(9)
Distributions to:
Preferred stockholders	(12,375)	(13,474)		(14,561)
Common stockholders	(35,645)	(32,346)		(29,205)
Noncontrolling interests	(12,228)	(11,117)		(9,956)
Net cash used in financing activities	(21,434)	(8,148)		(42,329)
Net increase (decrease) in cash and cash equivalents	(2,125)	(5,169)		5,164
Cash and cash equivalents, beginning of year	12,128	17,297		12,133
Cash and cash equivalents, end of year	10,003	12,128		17,297
Supplemental disclosure of cash flow information:
Cash paid for interest	45,965	45,443		45,743
Notes Assumed		11,000
Series C Preferred Stock
Proceeds from the issuance of:
Series C preferred stock	0	39,260		135,221
Distributions to:
Preferred stockholders	(12,375)	(9,625)		(6,095)
Series A Preferred Stock
Proceeds from the issuance of:
Preferred stock redemption payments	0	(40,000)		(60,000)
Distributions to:
Preferred stockholders	0	(3,849)		(5,213)
Series B Preferred Stock
Proceeds from the issuance of:
Preferred stock redemption payments	0	0		(79,328)
Distributions to:
Preferred stockholders	$ 0	$ 0		$ (3,253)

[1] The 2014 acquisition of real estate and proceeds from notes payable each exclude $11,000 in connection with the sale and leaseback of the Company's Olney property.