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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, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015
Net Sales: |  |  |  |  |  |
Total net sales |  | $ 186,903 | $ 165,289 | $ 349,519 | $ 328,114 |
Operating Income (Loss) |  |  |  |  |  |
Total operating income (loss) |  | 13,626 | 7,415 | 22,132 | 10,541 |
Total income before income taxes |  | 12,345 | 5,947 | 19,299 | 8,197 |
Interest Expense, net: |  |  |  |  |  |
Interest expense, net |  | 1,840 | 1,658 | 3,354 | 2,936 |
Capital Expenditures: |  |  |  |  |  |
Capital expenditures |  |  |  | 12,006 | 15,229 |
Total Assets: |  |  |  |  |  |
Total assets |  | 419,199 |  | 419,199 |  | $ 364,252
Continuing Operations [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 186,903 | 165,289 | 349,519 | 328,114 |
Depreciation and Amortization: |  |  |  |  |  |
Total depreciation and amortization | [1] | 5,870 | 5,788 | 11,139 | 11,906 |
Interest Expense, net: |  |  |  |  |  |
Interest expense, net |  | 1,840 | 1,658 | 3,354 | 2,936 |
Capital Expenditures: |  |  |  |  |  |
Capital expenditures |  | 5,189 | 6,740 | 12,006 | 15,229 |
Total Assets: |  |  |  |  |  |
Total assets |  | 419,199 |  | 419,199 |  | 364,252
Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |
Total operating income (loss) |  | 13,626 | 7,415 | 22,132 | 10,541 |
Intersegment Eliminations [Member] | Continuing Operations [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | (8,669) | (6,762) | (16,229) | (12,416) |
Total Assets: |  |  |  |  |  |
Total assets |  | (250,540) |  | (250,540) |  | (249,789)
Electronics [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 65,945 | 64,014 | 125,608 | 125,412 |
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 57,761 | 57,895 | 110,397 | 114,327 |
Operating Income (Loss) |  |  |  |  |  |
Total operating income (loss) |  | 4,495 | 3,222 | 8,315 | 6,646 |
Depreciation and Amortization: |  |  |  |  |  |
Total depreciation and amortization |  | 1,040 | 955 | 2,080 | 1,911 |
Interest Expense, net: |  |  |  |  |  |
Interest expense, net |  | 124 | 41 | 163 | 86 |
Capital Expenditures: |  |  |  |  |  |
Capital expenditures |  | 854 | 1,084 | 3,985 | 3,022 |
Total Assets: |  |  |  |  |  |
Total assets |  | 113,253 |  | 113,253 |  | 97,443
Electronics [Member] | Inter-Segment [Member] | Continuing Operations [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 8,184 | 6,119 | 15,211 | 11,085 |
Control Devices [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 109,374 | 85,041 | 202,275 | 165,600 |
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 108,889 | 84,398 | 201,257 | 164,269 |
Operating Income (Loss) |  |  |  |  |  |
Total operating income (loss) |  | 18,297 | 11,984 | 31,814 | 21,590 |
Depreciation and Amortization: |  |  |  |  |  |
Total depreciation and amortization |  | 2,475 | 2,326 | 4,784 | 4,786 |
Interest Expense, net: |  |  |  |  |  |
Interest expense, net |  | 55 | 81 | 116 | 165 |
Capital Expenditures: |  |  |  |  |  |
Capital expenditures |  | 3,304 | 3,847 | 6,031 | 7,882 |
Total Assets: |  |  |  |  |  |
Total assets |  | 158,061 |  | 158,061 |  | 127,649
Control Devices [Member] | Inter-Segment [Member] | Continuing Operations [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 485 | 643 | 1,018 | 1,331 |
Corporate [Member] | Continuing Operations [Member] |  |  |  |  |  |
Interest Expense, net: |  |  |  |  |  |
Interest expense, net |  | 659 | 733 | 1,323 | 1,461 |
Capital Expenditures: |  |  |  |  |  |
Capital expenditures |  | 9 |  | 114 | 913 |
Total Assets: |  |  |  |  |  |
Total assets | [2] | 284,554 |  | 284,554 |  | 288,806
Corporate [Member] | Continuing Operations [Member] | Scenario, Adjustment [Member] |  |  |  |  |  |
Capital Expenditures: |  |  |  |  |  |
Capital expenditures |  |  | (230) |  |  |
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |
Operating Income (Loss) |  |  |  |  |  |
Total operating income (loss) | [3] | (8,075) | (5,200) | (13,789) | (12,454) |
Depreciation and Amortization: |  |  |  |  |  |
Total depreciation and amortization |  | 124 | 55 | 194 | 70 |
PST [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 20,253 | 22,996 | 37,865 | 49,518 |
PST [Member] | Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |
Net Sales: |  |  |  |  |  |
Total net sales |  | 20,253 | 22,996 | 37,865 | 49,518 |
Operating Income (Loss) |  |  |  |  |  |
Total operating income (loss) |  | (1,091) | (2,591) | (4,208) | (5,241) |
Depreciation and Amortization: |  |  |  |  |  |
Total depreciation and amortization |  | 2,231 | 2,452 | 4,081 | 5,139 |
Interest Expense, net: |  |  |  |  |  |
Interest expense, net |  | 1,002 | 803 | 1,752 | 1,224 |
Capital Expenditures: |  |  |  |  |  |
Capital expenditures |  | 1,022 | 2,039 | 1,876 | 3,412 |
Total Assets: |  |  |  |  |  |
Total assets |  | 113,871 |  | 113,871 |  | $ 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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