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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Net Sales:      
Net sales $ 218,297 $ 225,930  
Operating Income (Loss)      
Total operating income (loss) 11,699 16,847  
Total income before income taxes 11,492 16,613  
Depreciation and Amortization:      
Total depreciation and amortization 7,229 7,788  
Interest Expense, net:      
Total interest expense, net 1,003 1,354  
Interest Expense, net:      
Total interest expense, net 1,003 1,354  
Capital Expenditures:      
Capital expenditures 8,684 10,505  
Long-Lived Assets 258,847   $ 239,342
Total Assets:      
Total assets 582,263   559,519
Intersegment Eliminations [Member]      
Net Sales:      
Net sales (10,589) (12,655)  
Total Assets:      
Total assets (315,846)   (322,866)
Control Devices [Member]      
Net Sales:      
Net sales 110,119 115,357  
Operating Income (Loss)      
Total operating income (loss) 11,948 17,879  
Depreciation and Amortization:      
Total depreciation and amortization 3,094 2,795  
Interest Expense, net:      
Total interest expense, net 182 19  
Capital Expenditures:      
Capital expenditures 3,492 5,746  
Total Assets:      
Total assets 191,963   175,708
Control Devices [Member] | Operating Segments [Member]      
Net Sales:      
Net sales 111,980 117,538  
Control Devices [Member] | Inter-Segment Sales [Member]      
Net Sales:      
Net sales 1,861 2,181  
Electronics [Member]      
Net Sales:      
Net sales 90,846 90,028  
Operating Income (Loss)      
Total operating income (loss) 9,031 7,880  
Depreciation and Amortization:      
Total depreciation and amortization 2,397 2,291  
Interest Expense, net:      
Total interest expense, net 56 34  
Capital Expenditures:      
Capital expenditures 3,738 2,773  
Total Assets:      
Total assets 255,887   265,838
Electronics [Member] | Operating Segments [Member]      
Net Sales:      
Net sales 99,568 100,500  
Electronics [Member] | Inter-Segment Sales [Member]      
Net Sales:      
Net sales 8,722 10,472  
PST [Member]      
Net Sales:      
Net sales 17,332 20,545  
Operating Income (Loss)      
Total operating income (loss) 670 150  
Depreciation and Amortization:      
Total depreciation and amortization 1,525 2,505  
Interest Expense, net:      
Total interest expense, net 108 338  
Capital Expenditures:      
Capital expenditures 819 1,259  
Total Assets:      
Total assets 81,407   81,002
PST [Member] | Operating Segments [Member]      
Net Sales:      
Net sales 17,338 20,547  
PST [Member] | Inter-Segment Sales [Member]      
Net Sales:      
Net sales 6 2  
Unallocated Corporate [Member]      
Operating Income (Loss)      
Total operating income (loss) (9,950) (9,062)  
Depreciation and Amortization:      
Total depreciation and amortization 213 197  
Interest Expense, net:      
Total interest expense, net 657 963  
Capital Expenditures:      
Capital expenditures 635 $ 727  
Total Assets:      
Total assets $ 368,852   $ 359,837