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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Net Sales:          
Total net sales $ 209,111 $ 186,903 $ 413,422 $ 349,519  
Operating Income (Loss)          
Total operating income (loss) 15,676 13,626 30,840 22,132  
Total income before income taxes 14,108 12,345 27,852 19,299  
Interest Expense, net:          
Interest expense, net 1,518 1,840 2,928 3,354  
Capital Expenditures:          
Capital expenditures     15,167 12,006  
Total Assets:          
Total assets 520,993   520,993   $ 394,529
Continuing Operations [Member]          
Net Sales:          
Total net sales 209,111 186,903 413,422 349,519  
Depreciation and Amortization:          
Total depreciation and amortization [1] 7,120 5,870 13,576 11,139  
Interest Expense, net:          
Interest expense, net 1,518 1,840 2,928 3,354  
Capital Expenditures:          
Capital expenditures 7,902 5,189 15,167 12,006  
Total Assets:          
Total assets 520,993   520,993   394,529
Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) 15,676 13,626 30,840 22,132  
Intersegment Eliminations [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales (11,591) (8,669) (23,730) (16,229)  
Total Assets:          
Total assets (336,001)   (336,001)   (250,494)
Electronics [Member]          
Net Sales:          
Total net sales 81,833 65,945 156,994 125,608  
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 71,610 57,761 135,415 110,397  
Operating Income (Loss)          
Total operating income (loss) 2,814 4,495 8,371 8,315  
Depreciation and Amortization:          
Total depreciation and amortization 2,241 1,040 3,811 2,080  
Interest Expense, net:          
Interest expense, net 6 124 44 163  
Capital Expenditures:          
Capital expenditures 1,684 854 4,034 3,985  
Total Assets:          
Total assets 234,363   234,363   99,964
Electronics [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 10,223 8,184 21,579 15,211  
Control Devices [Member]          
Net Sales:          
Total net sales 115,369 109,374 235,025 202,275  
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 114,001 108,889 232,874 201,257  
Operating Income (Loss)          
Total operating income (loss) 19,924 18,297 39,008 31,814  
Depreciation and Amortization:          
Total depreciation and amortization 2,687 2,475 5,386 4,784  
Interest Expense, net:          
Interest expense, net 11 55 65 116  
Capital Expenditures:          
Capital expenditures 4,347 3,304 7,795 6,031  
Total Assets:          
Total assets 157,853   157,853   150,623
Control Devices [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 1,368 485 2,151 1,018  
Corporate [Member] | Continuing Operations [Member]          
Interest Expense, net:          
Interest expense, net 969 659 1,715 1,323  
Capital Expenditures:          
Capital expenditures [2] 830 9 1,413 114  
Total Assets:          
Total assets [2] 359,494   359,494   287,031
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) [3] (8,185) (8,075) (18,241) (13,789)  
Depreciation and Amortization:          
Total depreciation and amortization 96 124 195 194  
PST [Member]          
Net Sales:          
Total net sales 23,500 20,253 45,133 37,865  
PST [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 23,500 20,253 45,133 37,865  
Operating Income (Loss)          
Total operating income (loss) 1,123 (1,091) 1,702 (4,208)  
Depreciation and Amortization:          
Total depreciation and amortization 2,096 2,231 4,184 4,081  
Interest Expense, net:          
Interest expense, net 532 1,002 1,104 1,752  
Capital Expenditures:          
Capital expenditures 1,041 1,022 1,925 1,876  
Total Assets:          
Total assets 105,284   105,284   $ 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, fixed assets for the corporate headquarter building, equity investments and investments in subsidiaries.
[3] Unallocated Corporate expenses include, among other items, finance, legal, human resources and information technology costs and share-based compensation.