Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Comprehensive income attributable to common stockholders
Net income	$ 515	$ 2,912	$ 5,762
Other comprehensive income/(loss):
Unrealized loss on available-for-sale securities	62	(188)	(208)
Benefit plan adjustments	(371)	(1,301)	(3,168)
Benefit plan reclassification for losses included in net income	0	536	407
Equity in other comprehensive income of unconsolidated joint venture	0	0	0
Unrealized interest rate swap gains/(losses)	1,040	678	(2,227)
Other comprehensive (loss) income before taxes	945	(41)	(6,199)
Benefit (provision) for income taxes related to other comprehensive loss items	(282)	38	2,644
Other comprehensive (loss) income	663	(3)	(3,555)
Comprehensive income	1,178	2,909	2,207
Comprehensive (loss) income attributable to non-controlling interests	(43)	(38)	107
Comprehensive income attributable to common stockholders	1,221	2,947	2,100
SERP
Other comprehensive income/(loss):
Benefit plan adjustments	214	234	$ (1,003)
Benefit plan reclassification for losses included in net income	$ 214	$ (389)