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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.

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