CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash Flows from Operating Activities
Net income	$ 58,798	$ 58,790	$ 45,797
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	24,699	19,586	15,274
Amortization	18,999	12,166	8,133
Amortization from financing and credit facility costs	1,055	979	720
Stock-based compensation	2,948	2,393	2,257
Provision for impairment	2,319	0	0
Write-off of deferred costs	0	0	333
(Gain) loss on sale of assets	(11,180)	(14,193)	(9,964)
(Increase) decrease in accounts receivable	(6,855)	(4,216)	(4,117)
(Increase) decrease in other assets	(463)	444	(109)
Increase (decrease) in accounts payable and accrued expenses	(1,265)	5,265	1,984
Increase (decrease) in deferred revenue	2,790	14	115
Increase (decrease) in accrued interest	1,367	1,202	1,247
Increase (decrease) in deferred income taxes	0	(230)	0
Increase (decrease) in tenant deposits	35	3	65
Net Cash Provided by Operating Activities	93,247	82,203	61,735
Cash Flows from Investing Activities
Acquisition of real estate investments and other assets	(611,129)	(319,572)	(297,868)
Development of real estate investments and other assets (including capitalized interest of $448 in 2018, $570 in 2017, and $210 in 2016)	(21,481)	(43,302)	(27,919)
Payment of leasing costs	(1,337)	(568)	(686)
Net proceeds from sale of assets	65,830	44,343	28,919
Net Cash Used In Investing Activities	(568,117)	(319,099)	(297,554)
Cash Flows from Financing Activities
Proceeds from common stock offerings, net	339,744	222,695	228,011
Repurchase of common shares	(1,145)	(1,111)	(712)
Unsecured revolving credit facility borrowings	363,000	203,000	252,000
Unsecured revolving credit facility repayments	(358,000)	(203,000)	(256,000)
Payments of mortgage notes payable	(27,576)	(2,412)	(31,578)
Unsecured term loan proceeds	100,000	0	60,283
Payments of unsecured term loans	(761)	(739)	(239)
Senior unsecured notes proceeds	125,000	100,000	60,000
Dividends paid	(67,638)	(55,146)	(42,058)
Distributions to Non-Controlling Interest	(737)	(695)	(657)
Payments for financing costs	(1,824)	(309)	(2,548)
Net Cash Provided by Financing Activities	470,063	262,283	266,502
Net Increase (Decrease) in Cash and Cash Equivalents	(4,807)	25,387	30,683
Cash and cash equivalents and cash held in escrow, beginning of period	58,782	33,395	2,712
Cash and cash equivalents and cash held in escrow, end of period	53,975	58,782	33,395
Supplemental Disclosure of Cash Flow Information
Cash paid for interest (net of amounts capitalized)	23,015	17,331	13,822
Cash paid (refunded) for income tax	452	257	153
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Shares issued under equity incentive plans (in dollars)	2,781	4,298	3,517
Dividends and limited partners' distributions declared and unpaid	21,031	16,303	13,124
Real Estate acquisitions financed with debt assumption	$ 0	$ 21,500	$ 0