Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
OPERATING ACTIVITIES
Net income	$ 13,696	$ 29,664
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	12,930	11,105
Amortization of leasing costs and in-place lease intangibles	5,849	5,646
Accrued straight-line rental revenue	(640)	(448)
Amortization of leasing incentives and above or below-market rents	(90)	(49)
Accrued straight-line ground rent expense	273	132
Bad debt expense	166	95
Noncash stock compensation	832	652
Impairment charges	31	35
Noncash interest expense	560	475
Gain on real estate dispositions	(3,395)	(26,687)
Change in the fair value of derivatives	(213)	2,762
Changes in operating assets and liabilities:
Property assets	(861)	(2,019)
Property liabilities	(2,778)	(1,543)
Construction assets	(6,495)	3,264
Construction liabilities	21	(4,136)
Net cash provided by operating activities	19,886	18,948
INVESTING ACTIVITIES
Development of real estate investments	(14,997)	(32,669)
Tenant and building improvements	(4,338)	(2,875)
Acquisitions of real estate investments, net of cash received	(6,767)	(164,978)
Dispositions of real estate investments	4,441	92,775
Notes receivable issuances	(13,836)	(31,486)
Decrease in restricted cash	(36)	(179)
Leasing costs	(807)	(1,003)
Leasing incentives	(2)	(87)
Contributions to equity method investments	(715)	(8,887)
Net cash used for investing activities	(37,057)	(149,389)
FINANCING ACTIVITIES
Proceeds from sales of common stock	96,044	31,180
Offering costs	(4,663)	(793)
Debt issuances, credit facility and construction loan borrowings	73,906	185,239
Debt and credit facility repayments, including principal amortization	(130,674)	(75,700)
Debt issuance costs	(471)	(559)
Redemption of operating partnership units	(229)	(58)
Dividends and distributions	(20,097)	(15,873)
Net cash provided by financing activities	13,816	123,436
Net decrease in cash and cash equivalents	(3,355)	(7,005)
Cash and cash equivalents, beginning of period	21,942	26,989
Cash and cash equivalents, end of period	18,587	19,984
Noncash transactions:
Redeemable noncontrolling interest from development	2,000	0
Deferred payment for land acquisition	$ 600	$ 0