CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows from Operating Activities
Net income	$ 58,790	$ 45,797	$ 39,762
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	19,586	15,274	11,530
Amortization	12,166	8,133	4,956
Amortization from financing and credit facility costs	979	720	689
Stock-based compensation	2,393	2,257	1,992
Write-off of deferred costs	0	333	181
(Gain) loss on sale of assets	(14,193)	(9,964)	(12,135)
(Increase) decrease in accounts receivable	(4,216)	(4,117)	(2,911)
(Increase) decrease in other assets	444	(109)	(197)
Increase (decrease) in accounts payable	5,265	1,984	1,043
Increase (decrease) in deferred revenue	14	115	(463)
Increase (decrease) in accrued interest	1,202	1,247	241
Increase (decrease) in deferred taxes	(230)	0	0
Increase (decrease) in tenant deposits	3	65	(8)
Net Cash Provided by Operating Activities	82,203	61,735	44,680
Cash Flows from Investing Activities
Acquisition of real estate investments and other assets	(319,572)	(297,868)	(223,871)
Development of real estate investments and other assets (including capitalized interest of $570 in 2017, $210 in 2016, and $39 in 2015)	(43,302)	(27,919)	(6,970)
Payment of leasing costs	(568)	(686)	(66)
Cash held in escrows on sale of assets	(7,975)	0	0
Net proceeds from sale of assets	44,343	28,919	28,132
Net Cash Used In Investing Activities	(327,074)	(297,554)	(202,775)
Cash Flows from Financing Activities
Proceeds from common stock offerings, net	222,695	228,011	92,260
Repurchase of common shares	(1,111)	(712)	0
Unsecured revolving credit facility borrowings	203,000	252,000	161,000
Unsecured revolving credit facility repayments	(203,000)	(256,000)	(158,000)
Payments of mortgage notes payable	(2,412)	(31,578)	(5,178)
Unsecured term loan proceeds	0	60,283	0
Payments of unsecured term loans	(739)	(239)	0
Senior unsecured notes proceeds	100,000	60,000	100,000
Dividends paid	(55,146)	(42,058)	(32,992)
Distributions to Non-Controlling Interest	(695)	(657)	(636)
Debt extinguishment costs	0	0	(150)
Payments for financing costs	(309)	(2,548)	(896)
Net Cash Provided by Financing Activities	262,283	266,502	155,408
Net Increase (Decrease) in Cash and Cash Equivalents	17,412	30,683	(2,687)
Cash and Cash Equivalents, beginning of period	33,395	2,712	5,399
Cash and Cash Equivalents, end of period	50,807	33,395	2,712
Supplemental Disclosure of Cash Flow Information
Cash paid for interest (net of amounts capitalized)	17,331	13,822	11,548
Cash paid (refunded) for income tax	257	153	155
Supplemental Disclosure of Non-Cash Investing and Financing Activities
Shares issued under equity incentive plans (in dollars)	4,298	3,517	2,864
Dividends and limited partners' distributions declared and unpaid	16,303	13,124	9,758
Real Estate acquisitions financed with debt assumption	$ 21,500	$ 0	$ 0