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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | $ 824,444 | $ 695,977 | $ 644,812
Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) |  | $ 13,234 | $ 13,296 | $ 15,676 | $ 15,164 | $ 10,170 | $ 11,780 | $ 13,626 | $ 8,506 | 57,370 | 44,082 | 27,815
Total income before income taxes |  |  |  |  |  |  |  |  |  | 52,582 | 39,185 | 20,230
Interest Expense, net: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 5,783 | 6,277 | 6,365
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 32,170 | 24,476 | 28,735
Long-Lived Assets |  | 255,668 |  |  |  | 153,636 |  |  |  | 255,668 | 153,636 |
Total Assets: |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | 559,037 |  |  |  | 394,529 |  |  |  | 559,037 | 394,529 |
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 824,444 | 695,977 | 644,812
Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |
Total income before income taxes |  |  |  |  |  |  |  |  |  | 57,370 | 44,082 | 27,815
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization | [1] |  |  |  |  |  |  |  |  | 27,930 | 23,258 | 22,409
Interest Expense, net: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 5,783 | 6,277 | 6,365
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 32,170 | 24,476 | 28,735
Total Assets: |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | 559,037 |  |  |  | 394,529 |  |  |  | 559,037 | 394,529 |
Eliminations [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | (45,108) | (35,187) | (24,959)
Total Assets: |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | (335,958) |  |  |  | (250,494) |  |  |  | (335,958) | (250,494) |
Electronics [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 321,884 | 238,617 | 239,448
Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |
Total income before income taxes |  |  |  |  |  |  |  |  |  | 18,119 | 14,798 | 13,784
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 8,143 | 3,971 | 3,666
Interest Expense, net: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 119 | 142 | 161
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 8,158 | 5,665 | 6,538
Total Assets: |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | 252,324 |  |  |  | 99,964 |  |  |  | 252,324 | 99,964 |
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 282,383 | 205,256 | 216,544
Electronics [Member] | Inter-Segment Sales [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 39,501 | 33,361 | 22,904
Control Devices [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 452,572 | 409,958 | 335,065
Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |
Total income before income taxes |  |  |  |  |  |  |  |  |  | 72,555 | 61,815 | 44,690
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 10,887 | 10,276 | 9,260
Interest Expense, net: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 103 | 226 | 326
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 17,484 | 13,261 | 15,094
Total Assets: |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | 164,632 |  |  |  | 150,623 |  |  |  | 164,632 | 150,623 |
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 447,528 | 408,132 | 333,010
Control Devices [Member] | Inter-Segment Sales [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 5,044 | 1,826 | 2,055
Corporate [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |
Total operating income (loss) | [2] |  |  |  |  |  |  |  |  | 35,965 | 29,069 | 23,117
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 584 | 452 | 211
Interest Expense, net: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 3,749 | 2,513 | 2,921
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures | [3] |  |  |  |  |  |  |  |  | 2,697 | 2,337 | 1,214
Total Assets: |  |  |  |  |  |  |  |  |  |  |  |
Total assets | [3] | 377,657 |  |  |  | 287,031 |  |  |  | 377,657 | 287,031 |
PST [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 95,096 | 82,589 | 95,258
Income (Loss) Before Income Taxes: |  |  |  |  |  |  |  |  |  |  |  |
Total income before income taxes |  |  |  |  |  |  |  |  |  | 2,661 | (3,462) | (7,542)
Depreciation and Amortization: |  |  |  |  |  |  |  |  |  |  |  |
Total depreciation and amortization |  |  |  |  |  |  |  |  |  | 8,316 | 8,559 | 9,272
Interest Expense, net: |  |  |  |  |  |  |  |  |  |  |  |
Interest expense, net |  |  |  |  |  |  |  |  |  | 1,812 | 3,396 | 2,957
Capital Expenditures: |  |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  |  | 3,831 | 3,213 | 5,889
Total Assets: |  |  |  |  |  |  |  |  |  |  |  |
Total assets |  | $ 100,382 |  |  |  | $ 107,405 |  |  |  | 100,382 | 107,405 |
PST [Member] | Operating Segments [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | 94,533 | 82,589 | 95,258
PST [Member] | Inter-Segment Sales [Member] | Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |
Net Sales: |  |  |  |  |  |  |  |  |  |  |  |
Total net sales |  |  |  |  |  |  |  |  |  | $ 563 |  |
[1] | These amounts represent depreciation and amortization on property, plant and equipment and certain intangible assets.
[2] | Unallocated Corporate expenses include, among other items, accounting/finance, human resources, information technology and legal costs as well as share-based compensation.
[3] | Corporate assets consist primarily of cash, intercompany loan receivables, capital expenditures for the headquarter building and information technology assets, equity investments and investments in subsidiaries.

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