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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Net Sales:          
Total net sales $ 173,846 $ 162,057 $ 523,365 $ 490,171  
Operating Income (Loss)          
Total operating income (loss) 11,780 8,947 33,912 19,488  
Total income before income taxes 10,900 7,443 30,199 15,640  
Interest Expense, net:          
Interest expense, net 1,684 1,747 5,038 4,683  
Capital Expenditures:          
Capital expenditures     18,484 23,521  
Total Assets:          
Total assets 413,602   413,602   $ 364,252
Continuing Operations [Member]          
Net Sales:          
Total net sales 173,846 162,057 523,365 490,171  
Depreciation and Amortization:          
Total depreciation and amortization [1] 5,979 5,646 17,118 17,552  
Interest Expense, net:          
Interest expense, net 1,684 1,747 5,038 4,683  
Capital Expenditures:          
Capital expenditures 6,478 8,292 18,484 23,521  
Total Assets:          
Total assets 413,602   413,602   364,252
Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) 11,780 8,947 33,912 19,488  
Intersegment Eliminations [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales (9,925) (7,049) (26,154) (19,465)  
Total Assets:          
Total assets (250,626)   (250,626)   (249,789)
Electronics [Member]          
Net Sales:          
Total net sales 57,299 57,255 182,907 182,666  
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 47,804 50,688 158,201 165,015  
Operating Income (Loss)          
Total operating income (loss) 3,735 2,767 12,050 9,413  
Depreciation and Amortization:          
Total depreciation and amortization 996 949 3,076 2,860  
Interest Expense, net:          
Interest expense, net 33 38 196 124  
Capital Expenditures:          
Capital expenditures 1,244 2,729 5,229 5,751  
Total Assets:          
Total assets 110,216   110,216   97,443
Electronics [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 9,495 6,567 24,706 17,651  
Control Devices [Member]          
Net Sales:          
Total net sales 104,130 87,512 306,405 253,113  
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 103,700 87,030 304,957 251,299  
Operating Income (Loss)          
Total operating income (loss) 15,319 12,197 47,133 33,787  
Depreciation and Amortization:          
Total depreciation and amortization 2,561 2,346 7,345 7,132  
Interest Expense, net:          
Interest expense, net 56 81 172 246  
Capital Expenditures:          
Capital expenditures 3,229 3,953 9,260 11,835  
Total Assets:          
Total assets 157,208   157,208   127,649
Control Devices [Member] | Inter-Segment [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 430 482 1,448 1,814  
Corporate [Member] | Continuing Operations [Member]          
Interest Expense, net:          
Interest expense, net 661 789 1,984 2,250  
Capital Expenditures:          
Capital expenditures 1,365 133 1,479 1,046  
Total Assets:          
Total assets [2] 284,869   284,869   288,806
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Operating Income (Loss)          
Total operating income (loss) [3] (7,303) (5,377) (21,092) (17,831)  
Depreciation and Amortization:          
Total depreciation and amortization 115 69 309 139  
PST [Member]          
Net Sales:          
Total net sales 22,342 24,339 60,207 73,857  
PST [Member] | Operating Segments [Member] | Continuing Operations [Member]          
Net Sales:          
Total net sales 22,342 24,339 60,207 73,857  
Operating Income (Loss)          
Total operating income (loss) 29 (640) (4,179) (5,881)  
Depreciation and Amortization:          
Total depreciation and amortization 2,307 2,282 6,388 7,421  
Interest Expense, net:          
Interest expense, net 934 839 2,686 2,063  
Capital Expenditures:          
Capital expenditures 640 1,477 2,516 4,889  
Total Assets:          
Total assets 111,935   111,935   $ 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.