Long-Term Contracts (Costs Incurred on Contracts) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Long-term Contracts Costs Incurred On Contracts Details
Costs and estimated earnings incurred on uncompleted contracts	$ 14,974	$ 12,087
Billings on uncompleted contracts	(14,974)	(11,100)
Net of costs and billings on uncompleted contracts	0	987
Included in accompanying consolidated balance sheets under the following captions:
Costs and estimated earnings in excess of billings on uncompleted contracts	0	987
Billings on uncompleted contracts in excess of related costs	0	0
Net of costs and billings on uncompleted contracts	$ 0	$ 987