Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Comprehensive income attributable to common stockholders
Net income (loss)	$ 5,342	$ (747)	$ 10,579
Other comprehensive (loss) income:
Unrealized (loss) gain on available-for-sale securities	(14)	(46)	440
Unrealized interest rate swap gain (loss)	2,841	(3,213)	(2,809)
Other comprehensive income (loss) before taxes	4,024	(4,096)	(2,658)
(Provision) benefit for income taxes related to other comprehensive income items	(1,126)	1,147	744
Other comprehensive income (loss)	2,898	(2,949)	(1,914)
Comprehensive income (loss)	8,240	(3,696)	8,665
Comprehensive loss attributable to non-controlling interests	(6)	(7)	(1)
Comprehensive income (loss) attributable to common stockholders	8,246	(3,689)	8,666
Pension plan
Other comprehensive (loss) income:
Benefit plan adjustments	866	(215)	135
SERP liability adjustments
Other comprehensive (loss) income:
Benefit plan adjustments	$ 331	$ (622)	$ (424)