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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Sales:      
Net sales $ 770,462 $ 648,006 $ 834,289
Operating Income (Loss)      
Total operating income (loss) 15,411 (7,664) 71,281
Total income before income taxes 12,436 (10,724) 68,393
Depreciation and Amortization:      
Total depreciation and amortization 33,828 32,730 30,859
Interest Expense, net:      
Total interest expense, net 5,189 6,124 4,324
Capital Expenditures:      
Capital expenditures 22,949 27,660 35,824
Long-Lived Assets 254,575 286,744  
Total Assets:      
Total assets 665,399 621,408  
Intersegment Eliminations [Member]      
Net Sales:      
Net sales (29,694) (29,502) (40,179)
Total Assets:      
Total assets (351,924) (329,140)  
Control Devices [Member]      
Net Sales:      
Net sales 355,775 342,576 431,560
Operating Income (Loss)      
Total operating income (loss) 54,933 22,072 73,327
Depreciation and Amortization:      
Total depreciation and amortization 15,351 15,377 13,397
Interest Expense, net:      
Total interest expense, net 132 173 172
Capital Expenditures:      
Capital expenditures 9,154 11,760 12,646
Total Assets:      
Total assets 181,968 194,433  
Control Devices [Member] | Operating Segments [Member]      
Net Sales:      
Net sales 359,276 348,051 437,998
Control Devices [Member] | Inter-Segment Sales [Member]      
Net Sales:      
Net sales 3,502 5,475 6,438
Electronics [Member]      
Net Sales:      
Net sales 357,910 257,767 335,195
Operating Income (Loss)      
Total operating income (loss) (12,502) (3,672) 25,006
Depreciation and Amortization:      
Total depreciation and amortization 12,487 10,501 9,872
Interest Expense, net:      
Total interest expense, net 462 320 162
Capital Expenditures:      
Capital expenditures 9,735 11,617 15,476
Total Assets:      
Total assets 338,080 303,914  
Electronics [Member] | Operating Segments [Member]      
Net Sales:      
Net sales 384,103 281,794 368,930
Electronics [Member] | Inter-Segment Sales [Member]      
Net Sales:      
Net sales 26,192 24,027 33,735
PST [Member]      
Net Sales:      
Net sales 56,777 47,663 67,534
Operating Income (Loss)      
Total operating income (loss) 995 3,766 6,539
Depreciation and Amortization:      
Total depreciation and amortization 3,856 4,766 6,338
Interest Expense, net:      
Total interest expense, net (1,353) (4) 167
Capital Expenditures:      
Capital expenditures 2,918 2,839 5,003
Total Assets:      
Total assets 59,100 61,350  
PST [Member] | Operating Segments [Member]      
Net Sales:      
Net sales 56,777 47,663 67,540
PST [Member] | Inter-Segment Sales [Member]      
Net Sales:      
Net sales     6
Corporate [Member]      
Operating Income (Loss)      
Total operating income (loss) (28,015) (29,830) (33,591)
Depreciation and Amortization:      
Total depreciation and amortization 2,134 2,086 1,252
Interest Expense, net:      
Total interest expense, net 5,948 5,635 3,823
Capital Expenditures:      
Capital expenditures 1,142 1,444 $ 2,699
Total Assets:      
Total assets $ 438,175 $ 390,851