Accounts Receivable, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, after Allowance for Credit Loss, Current	$ 153,806	$ 156,492
Allowance for Doubtful Other Receivables, Current	(2,008)	(1,246)
Less allowance for doubtful accounts	(2,008)	(1,246)
Provision for Other Credit Losses	(1,391)
Accounts Receivable, Allowance for Credit Loss, Additions due to Acquisitions	(82)
Accounts Receivable, Allowance for Credit Loss, Writeoff	722
Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation	(11)
Contract changes, negotiated settlements and claims for unanticipated contract costs	900	900
JPF [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss	64,000
Trade receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	19,945	13,794
Aged Receivable | JPF [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts Receivable, before Allowance for Credit Loss	32,400
U.S. Government contracts | Billed | Contract receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	18,854	15,136
U.S. Government contracts | Costs and accrued profit – not billed | Contract receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	1,080	894
Commercial and other government contracts | Billed | Contract receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	111,794	120,427
Commercial and other government contracts | Costs and accrued profit – not billed | Contract receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross accounts receivable	$ 4,141	$ 7,487