Business Segment Information - Financial Information by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Net Revenues	$ 645,413	$ 628,941	$ 721,088
Operating Income (Loss)	48,881	45,506	56,233
Depreciation and Amortization Expenses	28,389	28,850	28,305
Capital Expenditures	15,934	13,607	18,846
Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	412,648	392,633
Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	232,765	236,308
Operating Segments
Segment Reporting Information [Line Items]
Operating Income (Loss)	77,863	71,478	85,449
Operating Segments | Electronic Systems
Segment Reporting Information [Line Items]
Net Revenues	412,648	392,633	360,373
Operating Income (Loss)	57,629	51,894	38,613
Depreciation and Amortization Expenses	13,823	14,038	14,170
Capital Expenditures	7,471	5,037	5,508
Operating Segments | Structural Systems
Segment Reporting Information [Line Items]
Net Revenues	232,765	236,308	360,715
Operating Income (Loss)	20,234	19,584	46,836
Depreciation and Amortization Expenses	14,331	14,559	13,663
Capital Expenditures	8,463	8,570	13,338
Corporate Administration
Segment Reporting Information [Line Items]
Corporate General and Administrative Expenses	(28,982)	(25,972)	(29,216)
Depreciation and Amortization Expenses	235	253	472
Capital Expenditures	$ 0	$ 0	$ 0