Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Provision for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	$ 323	$ 411	$ 2,600
Charged to Revenue, Cost or Expense	322	0	(487)
Deduction	39	88	1,702
Balance at the End of the Period	606	323	411
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	15,443	12,493	16,960
Charged to Revenue, Cost or Expense	2,114	3,294	(4,587)
Deduction	0	344	(120)
Balance at the End of the Period	17,557	15,443	12,493
Reserve for losses on uncompleted contracts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	34	1,473	10,925
Charged to Revenue, Cost or Expense	351	33	543
Deduction	32	1,472	9,995
Balance at the End of the Period	$ 353	$ 34	$ 1,473