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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Net Sales:          
Total net sales $ 203,582 $ 173,846 $ 617,004 $ 523,365  
Operating Income (Loss)          
Total operating income (loss) 13,296 11,780 44,136 33,912  
Total income before income taxes 11,858 10,900 39,710 30,199  
Interest Expense, net:          
Interest expense, net 1,508 1,684 4,436 5,038  
Capital Expenditures:          
Capital expenditures     24,892 18,484  
Total Assets:          
Total assets 540,269   540,269   $ 394,529
Continuing Operations [Member]          
Net Sales:          
Total net sales 203,582 173,846 617,004 523,365  
Depreciation and Amortization:          
Total depreciation and amortization [1] 7,096 5,979 20,672 17,118  
Interest Expense, net:          
Interest expense, net 1,508 1,684 4,436 5,038  
Capital Expenditures:          
Capital expenditures 9,725 6,478 24,892 18,484  
Total Assets:          
Total assets 540,269   540,269   394,529
Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) 13,296 11,780 44,136 33,912  
Intersegment Eliminations [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales (10,222) (9,925) (33,952) (26,154)  
Total Assets:          
Total assets (336,498)   (336,498)   (250,494)
Electronics [Member]          
Net Sales:          
Total net sales 80,313 57,299 237,307 182,907  
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 71,354 47,804 206,769 158,201  
Operating Income (Loss)          
Total operating income (loss) 4,896 3,735 13,267 12,050  
Depreciation and Amortization:          
Total depreciation and amortization 2,136 996 5,947 3,076  
Interest Expense, net:          
Interest expense, net 24 33 68 196  
Capital Expenditures:          
Capital expenditures 2,417 1,244 6,451 5,229  
Total Assets:          
Total assets 245,568   245,568   99,964
Electronics [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 8,959 9,495 30,538 24,706  
Control Devices [Member]          
Net Sales:          
Total net sales 107,960 104,130 342,985 306,405  
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 106,842 103,700 339,716 304,957  
Operating Income (Loss)          
Total operating income (loss) 16,249 15,319 55,257 47,133  
Depreciation and Amortization:          
Total depreciation and amortization 2,664 2,561 8,050 7,345  
Interest Expense, net:          
Interest expense, net 19 56 84 172  
Capital Expenditures:          
Capital expenditures 5,523 3,229 13,318 9,260  
Total Assets:          
Total assets 166,641   166,641   150,623
Control Devices [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 1,118 430 3,269 1,448  
Corporate [Member] | Continuing Operations [Member]          
Interest Expense, net:          
Interest expense, net 1,087 661 2,802 1,984  
Capital Expenditures:          
Capital expenditures [2] 811 1,365 2,224 1,479  
Total Assets:          
Total assets [2] 356,396   356,396   287,031
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) [3] (8,867) (7,303) (27,108) (21,092)  
Depreciation and Amortization:          
Total depreciation and amortization 181 115 376 309  
PST [Member]          
Net Sales:          
Total net sales 25,531 22,342 70,664 60,207  
PST [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 25,386 22,342 70,519 60,207  
Operating Income (Loss)          
Total operating income (loss) 1,018 29 2,720 (4,179)  
Depreciation and Amortization:          
Total depreciation and amortization 2,115 2,307 6,299 6,388  
Interest Expense, net:          
Interest expense, net 378 934 1,482 2,686  
Capital Expenditures:          
Capital expenditures 974 640 2,899 2,516  
Total Assets:          
Total assets 108,162   108,162   $ 107,405
PST [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales $ 145 $ 145  
[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.