Condensed Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Rental revenues	$ 28,930	$ 27,096	$ 86,227	$ 81,083
Total revenues	48,880	68,297	149,881	242,474
Expenses
Rental expenses	7,103	6,830	20,049	19,069
Real estate taxes	2,840	2,693	8,388	7,797
Depreciation and amortization	10,196	9,239	28,653	28,018
General and administrative expenses	2,367	2,098	8,092	7,762
Acquisition, development and other pursuit costs	69	61	162	477
Impairment charges	3	19	101	50
Total expenses	41,551	60,317	126,919	217,761
Operating income	7,329	7,980	22,962	24,713
Interest income	2,545	1,910	7,152	4,966
Interest expense	(4,677)	(4,253)	(13,547)	(13,282)
Loss on extinguishment of debt	(11)	0	(11)	0
Gain on real estate dispositions	0	4,692	0	8,087
Change in fair value of interest rate derivatives	298	87	1,256	300
Other income	65	74	233	154
Income before taxes	5,549	10,490	18,045	24,938
Income tax benefit (provision)	120	(29)	552	(781)
Net income	5,669	10,461	18,597	24,157
Net income attributable to noncontrolling interests	(1,467)	(2,973)	(5,036)	(7,262)
Net income attributable to stockholders	$ 4,202	$ 7,488	$ 13,561	$ 16,895
Net income attributable to stockholders per share (basic and diluted) (in dollars per share)	$ 0.09	$ 0.17	$ 0.29	$ 0.41
Weighted-average common shares outstanding (basic and diluted) (in shares)	49,194	44,934	46,766	41,575
Dividends and distributions declared per common share and unit (in dollars per share)	$ 0.20	$ 0.19	$ 0.60	$ 0.57
Comprehensive income:
Net income	$ 5,669	$ 10,461	$ 18,597	$ 24,157
Unrealized cash flow hedge losses	(130)	0	(130)	0
Realized cash flow hedge losses reclassified to net income	67	0	67	0
Comprehensive income	5,606	10,461	18,534	24,157
Comprehensive income attributable to noncontrolling interests	(1,450)	(2,973)	(5,019)	(7,262)
Comprehensive income attributable to stockholders	4,156	7,488	13,515	16,895
General contracting and real estate services
General contracting and real estate services revenues	19,950	41,201	63,654	161,391
General contracting and real estate services expenses	$ 18,973	$ 39,377	$ 61,474	$ 154,588