Construction Contracts (Summary of Costs in Excess of Billings and Billings in Excess of Costs) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Change In Contract With Customer, Asset [Roll Forward]
Beginning balance	$ 138	$ 249
Transferred to receivables	(714)	(545)
Construction contract costs and estimated earnings not billed during the period	243	138
Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion	576	296
Ending balance	243	138
Change In Contract With Customer, Liability [Roll Forward]
Beginning balance	6,088	5,306
Revenue recognized that was included in the balance at the beginning of the period	(6,088)	(5,306)
Increases due to new billings, excluding amounts recognized as revenue during the period	6,237	6,244
Changes due to cumulative catch-up adjustment arising from changes in the estimate of the stage of completion	(1,356)	(156)
Ending balance	$ 4,881	$ 6,088