Consolidated Statements of Cash Flows - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income		$ 64,196	$ 63,059	$ 60,668
Adjustments to reconcile net income to net cash provided by operating activities:
Change in fair value of derivatives		436	3	(70)
Gain on sale of property		0	(509)	0
Depreciation and amortization of deferred leasing costs		46,333	45,861	45,694
Amortization of deferred debt costs		1,518	1,610	1,392
Non cash compensation costs of stock grants and options		1,859	1,766	1,672
Provision for credit losses		1,226	685	906
(Increase) decrease in accounts receivable and accrued income		339	(336)	(1,643)
Additions to deferred leasing costs		(1,843)	(6,034)	(4,615)
(Increase) decrease in prepaid expenses		(188)	73	(294)
Decrease in other assets		894	3,681	1,374
Increase in accounts payable, accrued expenses and other liabilities		158	225	1,125
Increase (decrease) in deferred income		455	255	(2,759)
Net cash provided by operating activities		115,383	110,339	103,450
Cash flows from investing activities:
Acquisitions of real estate investments	[1]	0	(40,836)	(79,499)
Additions to real estate investments		(21,891)	(12,883)	(17,653)
Additions to development and redevelopment projects		(113,772)	(76,257)	(22,842)
Proceeds from sale of properties	[2]	0	1,326	6,688
Net cash used in investing activities		(135,663)	(128,650)	(113,306)
Cash flows from financing activities:
Proceeds from mortgage notes payable		50,600	54,900	100,000
Repayments on mortgage notes payable		(109,235)	(72,572)	(55,679)
Proceeds from term loan facility		0	75,000	0
Proceeds from revolving credit facility		152,500	102,000	63,000
Repayments on revolving credit facility		(112,000)	(116,000)	(51,000)
Proceeds from construction loans payable		86,868	23,332	1,437
Additions to deferred debt costs		(1,010)	(3,233)	(2,583)
Proceeds from the issuance of:
Common stock		25,039	30,503	22,751
Partnership units	[1]	3,180	5,383	6,735
Preferred stock redemption costs		0	(12)	0
Distributions to:
Distributions to preferred stockholders		(12,390)	(12,402)	(12,375)
Common stockholders		(48,568)	(46,306)	(44,576)
Noncontrolling interests		(16,642)	(15,981)	(15,268)
Net cash provided by financing activities		19,607	21,981	12,442
Net increase (decrease) in cash and cash equivalents		(673)	3,670	2,586
Cash and cash equivalents, beginning of year		14,578	10,908	8,322
Cash and cash equivalents, end of year		13,905	14,578	10,908
Supplemental disclosure of cash flow information:
Cash paid for interest		40,434	43,561	45,713
Increase (decrease) in accrued real estate investments and development costs		303	9,663	2,097
Series C Cumulative Preferred Stock
Proceeds from the issuance of:
Series C preferred stock redemption		(105,000)	(75,000)	0
Distributions to:
Distributions to preferred stockholders		(7,541)	(9,238)	(12,375)
Series D Cumulative Redeemable Preferred Stock
Proceeds from the issuance of:
Preferred stock		0	72,369	0
Distributions to:
Distributions to preferred stockholders		(4,592)	(3,164)	0
Series E Cumulative Redeemable Preferred Stock
Proceeds from the issuance of:
Preferred stock		106,265	0	0
Distributions to:
Distributions to preferred stockholders		$ (257)	0	$ 0
Ashbrook Marketplace
Supplemental disclosure of cash flow information:
Limited partnership units issued			8,776
Great Eastern Shopping Center
Supplemental disclosure of cash flow information:
Seller financing			1,275
Interest income			$ 51

[1] The 2018 acquisition of real estate and proceeds from the issuance of partnership units each excludes $8,776 in connection with the acquisition of Ashbrook Marketplace in exchange for limited partnership units.

[2] Proceeds from sale of property in 2017 excludes $1,275 of seller financing in connection with the sale of the Company's Great Eastern property, which were received in 2018 plus accrued interest of $51.