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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Net Sales:      
Total net sales $ 162,616 $ 162,825  
Income (Loss) Before Income Taxes:      
Total operating income (loss) 8,506 3,126  
Total income before income taxes 6,954 2,250  
Interest Expense, net:      
Interest expense, net 1,514 1,278  
Capital Expenditures:      
Capital expenditures 6,817 8,490  
Total Assets:      
Total assets 393,726   $ 364,252
Continuing Operations [Member]      
Net Sales:      
Total net sales 162,616 162,825  
Depreciation and Amortization:      
Total depreciation and amortization [1] 5,269 6,116  
Interest Expense, net:      
Interest expense, net 1,514 1,278  
Capital Expenditures:      
Capital expenditures 6,817 8,490  
Total Assets:      
Total assets 393,726   364,252
Operating Segments [Member] | Continuing Operations [Member]      
Income (Loss) Before Income Taxes:      
Total operating income (loss) 8,506 3,126  
Intersegment Eliminations [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales (7,560) (5,654)  
Total Assets:      
Total assets (248,019)   (249,789)
Electronics [Member]      
Net Sales:      
Total net sales 59,663 61,398  
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 52,636 56,432  
Income (Loss) Before Income Taxes:      
Total operating income (loss) 3,820 3,424  
Depreciation and Amortization:      
Total depreciation and amortization 1,040 956  
Interest Expense, net:      
Interest expense, net 39 45  
Capital Expenditures:      
Capital expenditures 3,131 1,938  
Total Assets:      
Total assets 110,540   97,443
Electronics [Member] | Inter-Segment [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 7,027 4,966  
Control Devices [Member]      
Net Sales:      
Total net sales 92,901 80,558  
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 92,368 79,870  
Income (Loss) Before Income Taxes:      
Total operating income (loss) 13,517 9,605  
Depreciation and Amortization:      
Total depreciation and amortization 2,309 2,459  
Interest Expense, net:      
Interest expense, net 61 85  
Capital Expenditures:      
Capital expenditures 2,727 4,035  
Total Assets:      
Total assets 145,383   127,649
Control Devices [Member] | Inter-Segment [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 533 688  
Corporate [Member] | Continuing Operations [Member]      
Interest Expense, net:      
Interest expense, net 664 728  
Capital Expenditures:      
Capital expenditures 105 1,144  
Total Assets:      
Total assets [2] 280,641   288,806
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Income (Loss) Before Income Taxes:      
Total operating income (loss) [3] (5,714) (7,253)  
Depreciation and Amortization:      
Total depreciation and amortization 70 14  
PST [Member]      
Net Sales:      
Total net sales 17,612 26,523  
PST [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 17,612 26,523  
Income (Loss) Before Income Taxes:      
Total operating income (loss) (3,117) (2,650)  
Depreciation and Amortization:      
Total depreciation and amortization 1,850 2,687  
Interest Expense, net:      
Interest expense, net 750 420  
Capital Expenditures:      
Capital expenditures 854 $ 1,373  
Total Assets:      
Total assets $ 105,181   $ 100,143
PST [Member] | Inter-Segment [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales  
[1] These amounts represent depreciation and amortization on property, plant and equipment and certain intangible assets.
[2] Assets located at Corporate consist primarily of cash, intercompany loan receivables, equity investments and investments in subsidiaries.
[3] Unallocated Corporate expenses include, among other items, finance, legal, human resources and information technology costs as well as share-based compensation.