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	$ 55,516	$ 63,289	$ 53,095
Adjustments to reconcile net income to net cash provided by operating activities
Straight-line rents	(2,597)	(3,459)	(3,657)
Amortization of lease intangibles	(4,682)	(3,694)	(2,161)
Depreciation and amortization	44,015	40,816	37,870
Loss on extinguishment of debt	189	0	0
Gain on sales of real estate investments	(9,391)	(28,610)	(30,654)
Deferred financing cost amortization	1,562	1,442	1,193
Deferred senior secured loan fee amortization	(531)	(392)	0
Stock-based compensation	10,644	9,270	8,732
Changes in assets and liabilities
Other assets	(1,579)	(1,531)	584
Accounts payable and other liabilities	1,542	468	4,496
Net cash provided by operating activities	94,688	77,599	69,498
CASH FLOWS FROM INVESTING ACTIVITIES
Cash paid for property acquisitions	(238,661)	(221,806)	(297,109)
Proceeds from sales of real estate investments, net	47,133	79,594	75,396
Additions to construction in progress	(27,884)	(9,668)	0
Additions to buildings, improvements and leasing costs	(32,070)	(28,977)	(27,405)
Cash paid for senior secured loan	0	(55,000)	0
Origination and other fees received on senior secured loan	0	900	0
Net cash used in investing activities	(251,482)	(234,957)	(249,118)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuance of common stock	278,058	208,949	255,295
Issuance costs on issuance of common stock	(4,023)	(3,030)	(3,764)
Repurchase of common stock	(3,959)	(3,870)	(3,436)
Repurchase of preferred stock	0	0	(46,000)
Borrowings on credit facility	17,000	204,000	93,000
Payments on credit facility	(36,000)	(185,000)	(144,500)
Payments on term loans payable	(50,000)	0	0
Borrowings on senior unsecured notes	100,000	0	100,000
Payments on mortgage loans payable	(1,514)	(19,201)	(1,916)
Payment of deferred financing costs	(943)	(1,366)	(872)
Dividends paid to common stockholders	(63,565)	(51,445)	(41,866)
Dividends paid to preferred stockholders	0	0	(1,999)
Net cash provided by financing activities	235,054	149,037	203,942
Net increase (decrease) in cash and cash equivalents and restricted cash	78,260	(8,321)	24,322
Cash and cash equivalents and restricted cash	34,479	42,800	18,478
Cash and cash equivalents and restricted cash at end of year	112,739	34,479	42,800
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION
Cash paid for interest, net of capitalized interest	18,351	19,787	13,839
Supplemental disclosures of non-cash transactions
Accounts payable related to capital improvements	12,498	10,712	6,996
Redemption of preferred stock	0	0	1,729
Non-cash repayment of senior secured loan	(39,085)	0	0
Lease liability arising from recognition of right-of-use asset	647
Reconciliation of cash paid for property acquisitions
Acquisition of properties	250,506	227,058	319,666
Assumption of other assets and liabilities	(11,845)	(5,252)	(22,557)
Net cash paid for property acquisitions	$ 238,661	$ 221,806	$ 297,109