Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
OPERATING ACTIVITIES
Net income	$ 37,610	$ 22,740
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	17,055	13,998
Amortization of leasing costs and in-place lease intangibles	8,581	2,993
Accrued straight-line rental revenue	(765)	(1,724)
Amortization of leasing incentives and above or below-market rents	(61)	564
Accrued straight-line ground rent expense	291	224
Bad debt expense	178	123
Noncash stock compensation	864	755
Impairment charges	184	23
Noncash interest expense	687	791
Noncash loss on extinguishment of debt	82	410
Gain on real estate dispositions	(30,440)	(13,407)
Change in the fair value of derivatives	2,264	238
Changes in operating assets and liabilities:
Property assets	(4,938)	(2,524)
Property liabilities	3,856	2,369
Construction assets	(5,863)	(29,027)
Construction liabilities	9,197	19,078
Net cash provided by operating activities	38,782	17,624
INVESTING ACTIVITIES
Development of real estate investments	(48,671)	(40,293)
Tenant and building improvements	(4,399)	(3,794)
Acquisitions of real estate investments, net of cash received	(177,865)	(64,945)
Dispositions of real estate investments	96,312	50,613
Government development grants	0	300
Notes receivable issuances	(42,110)	0
(Decrease) increase in restricted cash	(210)	742
Leasing costs	(1,601)	(1,715)
Leasing incentives	(188)	(1,563)
Contributions to equity method investments	(8,949)	0
Net cash used for investing activities	(187,681)	(60,655)
FINANCING ACTIVITIES
Proceeds from sales of common stock	51,088	7,687
Offering costs	(1,183)	(321)
Debt issuances, credit facility and construction loan borrowings	290,105	200,267
Debt and credit facility repayments, including principal amortization	(167,659)	(153,321)
Debt issuance costs	(1,791)	(1,844)
Redemption of operating partnership units	(58)	(79)
Dividends and distributions	(24,702)	(20,050)
Net cash provided by financing activities	145,800	32,339
Net decrease in cash and cash equivalents	(3,099)	(10,692)
Cash and cash equivalents, beginning of period	26,989	25,883
Cash and cash equivalents, end of period	$ 23,890	$ 15,191