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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Net Sales:      
Total net sales $ 204,311 $ 162,616  
Operating Income (Loss)      
Total operating income (loss) 15,164 8,506  
Total income before income taxes 13,744 6,954  
Interest Expense, net:      
Interest expense, net 1,410 1,514  
Capital Expenditures:      
Capital expenditures 7,265 6,817  
Total Assets:      
Total assets 519,546   $ 394,529
Continuing Operations [Member]      
Net Sales:      
Total net sales 204,311 162,616  
Depreciation and Amortization:      
Total depreciation and amortization [1] 6,458 5,269  
Interest Expense, net:      
Interest expense, net 1,410 1,514  
Capital Expenditures:      
Capital expenditures 7,265 6,817  
Total Assets:      
Total assets 519,546   394,529
Operating Segments [Member] | Continuing Operations [Member]      
Operating Income (Loss)      
Total operating income (loss) 15,164 8,506  
Intersegment Eliminations [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales (12,139) (7,560)  
Total Assets:      
Total assets (331,717)   (250,494)
Electronics [Member]      
Net Sales:      
Total net sales 75,161 59,663  
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 63,805 52,636  
Operating Income (Loss)      
Total operating income (loss) 5,557 3,820  
Depreciation and Amortization:      
Total depreciation and amortization 1,572 1,040  
Interest Expense, net:      
Interest expense, net 38 39  
Capital Expenditures:      
Capital expenditures 2,351 3,131  
Total Assets:      
Total assets 214,390   99,964
Electronics [Member] | Inter-Segment [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 11,356 7,027  
Control Devices [Member]      
Net Sales:      
Total net sales 119,656 92,901  
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 118,873 92,368  
Operating Income (Loss)      
Total operating income (loss) 19,084 13,517  
Depreciation and Amortization:      
Total depreciation and amortization 2,699 2,309  
Interest Expense, net:      
Interest expense, net 54 61  
Capital Expenditures:      
Capital expenditures 3,447 2,727  
Total Assets:      
Total assets 162,218   150,623
Control Devices [Member] | Inter-Segment [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 783 533  
Corporate [Member] | Continuing Operations [Member]      
Interest Expense, net:      
Interest expense, net 746 664  
Capital Expenditures:      
Capital expenditures [2] 583 105  
Total Assets:      
Total assets [2] 364,760   287,031
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Operating Income (Loss)      
Total operating income (loss) [3] (10,056) (5,714)  
Depreciation and Amortization:      
Total depreciation and amortization 99 70  
PST [Member]      
Net Sales:      
Total net sales 21,633 17,612  
PST [Member] | Operating Segments [Member] | Continuing Operations [Member]      
Net Sales:      
Total net sales 21,633 17,612  
Operating Income (Loss)      
Total operating income (loss) 579 (3,117)  
Depreciation and Amortization:      
Total depreciation and amortization 2,088 1,850  
Interest Expense, net:      
Interest expense, net 572 750  
Capital Expenditures:      
Capital expenditures 884 854  
Total Assets:      
Total assets 109,895   $ 107,405
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, capital expenditures for the new headquarter building, 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.