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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.