Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
OPERATING ACTIVITIES
Net income	$ 12,928	$ 13,696
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	13,540	12,930
Amortization of leasing costs and in-place lease intangibles	4,917	5,849
Accrued straight-line rental revenue	(1,029)	(640)
Amortization of leasing incentives and above or below-market rents	(141)	(90)
Accrued straight-line ground rent expense	136	273
Bad debt expense	112	166
Noncash stock compensation	820	832
Impairment charges	98	31
Noncash interest expense	557	560
Gain on real estate dispositions	0	(3,395)
Change in the fair value of interest rate derivatives	(958)	(213)
Changes in operating assets and liabilities:
Property assets	(2,505)	(1,009)
Property liabilities	(1,973)	(2,489)
Construction assets	4,443	(6,495)
Construction liabilities	(15,081)	21
Interest receivable	(4,604)	(3,053)
Net cash provided by operating activities	11,260	16,974
INVESTING ACTIVITIES
Development of real estate investments	(57,741)	(14,997)
Tenant and building improvements	(5,599)	(4,338)
Acquisitions of real estate investments, net of cash received	(32,967)	(6,767)
Dispositions of real estate investments	4,271	4,441
Notes receivable issuances	(5,816)	(10,783)
Leasing costs	(2,060)	(807)
Leasing incentives	(79)	(2)
Contributions to equity method investments	(3,127)	(715)
Net cash used for investing activities	(103,118)	(33,968)
FINANCING ACTIVITIES
Proceeds from sales of common stock	49,730	96,044
Offering costs	(749)	(4,663)
Common shares tendered for tax withholding	(343)	(289)
Debt issuances, credit facility and construction loan borrowings	147,248	73,906
Debt and credit facility repayments, including principal amortization	(84,277)	(130,674)
Debt issuance costs	(381)	(471)
Redemption of operating partnership units	(2,531)	(229)
Dividends and distributions	(24,337)	(20,097)
Net cash provided by financing activities	84,360	13,527
Net decrease in cash and cash equivalents	(7,498)	(3,467)
Cash, cash equivalents, and restricted cash, beginning of period	22,916	25,193
Cash, cash equivalents, and restricted cash, end of period	15,418	21,726
Supplemental Disclosures (noncash transactions):
Increase in dividends payable	1,450	1,973
Increase in accounts payable and accrued liabilities for capital expenditures	6,692	4,608
Issuance of operating partnership units for acquisitions	1,702	982
Operating Partnership units redeemed for common shares	1,804	0
Redeemable noncontrolling interest from development	0	2,000
Deferred payment for land acquisition	$ 0	$ 600