Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Rental revenues	$ 108,737	$ 99,355	$ 81,172
General contracting and real estate services revenues	194,034	159,030	171,268
Total revenues	302,771	258,385	252,440
Expenses
Rental expenses	25,422	21,904	19,204
Real estate taxes	10,528	9,629	7,782
General contracting and real estate services expenses	186,590	153,375	165,344
Depreciation and amortization	37,321	35,328	23,153
General and administrative expenses	10,435	9,552	8,397
Acquisition, development and other pursuit costs	648	1,563	1,935
Impairment charges	110	355	41
Total expenses	271,054	231,706	225,856
Operating income	31,717	26,679	26,584
Interest income	7,077	3,228	126
Interest expense	(17,439)	(16,466)	(13,333)
Loss on extinguishment of debt	(50)	(82)	(512)
Gain on real estate dispositions	8,087	30,533	18,394
Change in fair value of interest rate derivatives	1,127	(941)	(229)
Other income	131	147	119
Income before taxes	30,650	43,098	31,149
Income tax benefit (provision)	(725)	(343)	34
Net income	29,925	42,755	31,183
Net income attributable to noncontrolling interests	(8,878)	(14,681)	(11,541)
Net income attributable to stockholders	$ 21,047	$ 28,074	$ 19,642
Net income per share and unit:
Basic and diluted (in dollars per share)	$ 0.50	$ 0.85	$ 0.75
Weighted-average outstanding:
Common shares (in shares)	42,423	33,057	26,006
Common units (in shares)	17,758	17,167	15,377
Basic and diluted (in shares)	60,181	50,224	41,383
Comprehensive income:
Net income	$ 29,925	$ 42,755	$ 31,183
Unrealized cash flow hedge losses	0	0	(1,075)
Realized cash flow hedge losses reclassified to net income	0	0	27
Comprehensive income	29,925	42,755	30,135
Comprehensive income attributable to noncontrolling interests	(8,878)	(14,681)	(11,141)
Comprehensive income attributable to stockholders	$ 21,047	$ 28,074	$ 18,994