Schedule II - Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Provision for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	$ 411	$ 2,600	$ 4,280
Charged to Revenue, Cost or Expense	0	(487)	0
Deduction	88	1,702	1,680
Balance at the End of the Period	323	411	2,600
Reserve for losses on uncompleted contracts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of the Period	1,473	10,925	22,770
Charged to Revenue, Cost or Expense	33	543	2,455
Deduction	1,472	9,995	14,300
Balance at the End of the Period	$ 34	$ 1,473	$ 10,925