Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
OPERATING ACTIVITIES
Net income	$ 6,983	$ 8,753
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of buildings and tenant improvements	6,773	6,473
Amortization of leasing costs and in-place lease intangibles	2,505	3,002
Accrued straight-line rental revenue	(562)	(383)
Amortization of leasing incentives and above or below-market rents	(56)	(47)
Accrued straight-line ground rent expense	84	138
Bad debt expense	52	68
Noncash stock compensation	549	411
Impairment charges	0	4
Noncash interest expense	326	277
Gain on real estate dispositions	0	(3,395)
Change in the fair value of interest rate derivatives	(969)	(294)
Changes in operating assets and liabilities:
Property assets	1,771	1,391
Property liabilities	(3,827)	(875)
Construction assets	3,482	(13,137)
Construction liabilities	(11,183)	5,888
Net cash provided by operating activities	5,928	8,274
INVESTING ACTIVITIES
Development of real estate investments	(26,438)	(6,456)
Tenant and building improvements	(2,246)	(2,069)
Acquisitions of real estate investments, net of cash received	(33,368)	(6,767)
Dispositions of real estate investments	0	4,441
Notes receivable issuances	(5,607)	(1,413)
Leasing costs	(680)	(493)
Contributions to equity method investments	(1,410)	(559)
Net cash used for investing activities	(69,749)	(13,316)
FINANCING ACTIVITIES
Proceeds from sales of common stock	0	3,523
Offering costs	0	(161)
Debt issuances, credit facility and construction loan borrowings	111,498	44,952
Debt and credit facility repayments, including principal amortization	(39,273)	(44,530)
Debt issuance costs	(201)	(471)
Redemption of operating partnership units	(5)	(50)
Dividends and distributions	(11,808)	(9,726)
Net cash provided by (used for) financing activities	60,211	(6,463)
Net decrease in cash and cash equivalents	(3,610)	(11,505)
Cash, cash equivalents, and restricted cash, beginning of period	22,916	25,193
Cash, cash equivalents, and restricted cash, end of period	19,306	13,688
Noncash transactions:
Increase in dividends payable	744	644
(Decrease) increase in accounts payable and accrued liabilities for capital expenditures	(4,434)	742
Issuance of operating partnership units for acquisitions	1,702	0
Redeemable noncontrolling interest from development	0	2,000
Deferred payment for land acquisition	$ 0	$ 600

Amortization of long-term land leases capitalized as part of real property.

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Name:	us-gaap_ProvisionForDoubtfulAccounts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Difference between actual rental income due and rental income recognized on a straight-line basis.

+ References

+ Details

Name:	us-gaap_StraightLineRent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Value of new stock classified as temporary equity issued during the period.

+ References

No definition available.

+ Details

Name:	us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

+ Details

Name:	us-gaap_UnrealizedGainLossOnDerivatives
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration