Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
OPERATING ACTIVITIES
Net income	$ 18,597	$ 24,157
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	21,404	19,385
Amortization of leasing costs and in-place lease intangibles	7,249	8,633
Accrued straight-line rental revenue	(1,789)	(927)
Amortization of leasing incentives and above or below-market rents	(211)	(140)
Accrued straight-line ground rent expense	187	401
Bad debt expense	245	425
Noncash stock compensation	1,072	1,047
Impairment charges	101	50
Noncash interest expense	827	940
Loss on extinguishment of debt	11	0
Gain on real estate dispositions	0	(8,087)
Change in the fair value of interest rate derivatives	(1,256)	(300)
Changes in operating assets and liabilities:
Property assets	(3,610)	(3,871)
Property liabilities	2,031	3,498
Construction assets	3,044	4,065
Construction liabilities	(13,558)	(12,648)
Interest receivable	(7,147)	(4,962)
Net cash provided by operating activities	27,197	31,666
INVESTING ACTIVITIES
Development of real estate investments	(102,183)	(28,731)
Tenant and building improvements	(8,281)	(8,104)
Acquisitions of real estate investments, net of cash received	(57,541)	(28,020)
Dispositions of real estate investments, net of selling costs	4,271	12,557
Notes receivable issuances	(10,281)	(10,792)
Leasing costs	(4,048)	(149)
Leasing incentives	(95)	(147)
Contributions to equity method investments	(5,400)	(934)
Net cash used for investing activities	(183,558)	(64,320)
FINANCING ACTIVITIES
Proceeds from sales of common stock	60,439	96,044
Offering costs	(910)	(4,663)
Common shares tendered for tax withholding	(343)	(289)
Debt issuances, credit facility and construction loan borrowings	274,427	124,206
Debt and credit facility repayments, including principal amortization	(138,122)	(152,201)
Debt issuance costs	(1,317)	(751)
Redemption of operating partnership units	(2,531)	(229)
Dividends and distributions	(37,550)	(31,740)
Net cash provided by financing activities	154,093	30,377
Net decrease in cash and cash equivalents	(2,268)	(2,277)
Cash, cash equivalents, and restricted cash, beginning of period	22,916	25,193
Cash, cash equivalents, and restricted cash, end of period	20,648	22,916
Supplemental Disclosures (noncash transactions):
Increase in dividends payable	1,610	2,214
Increase (decrease) in accounts payable and accrued liabilities for capital expenditures	10,103	(5,874)
Issuance of operating partnership units for acquisitions	1,702	982
Operating Partnership units redeemed for common shares	3,151	0
Redeemable noncontrolling interest from development	0	2,000
Deferred payment for land acquisition	$ 0	$ 600