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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, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Net Sales:                      
Net sales $ 210,814 $ 208,853 $ 220,602 $ 225,930 $ 207,440 $ 203,582 $ 209,111 $ 204,311 $ 866,199 $ 824,444 $ 695,977
Operating Income (Loss)                      
Total operating income (loss) 12,664 $ 18,312 $ 19,181 $ 16,847 13,234 $ 13,296 $ 15,676 $ 15,164 67,004 57,370 44,082
Total income before income taxes                 65,058 52,582 39,185
Depreciation and Amortization:                      
Total depreciation and amortization                 29,191 27,930 23,258
Interest Expense, net:                      
Total interest expense, net                 4,720 5,783 6,277
Capital Expenditures:                      
Capital expenditures                 29,027 32,170 24,476
Long-Lived Assets 239,342       255,668       239,342 255,668  
Total Assets:                      
Total assets 559,519       559,037       559,519 559,037  
Goodwill impairment charge (benefit)                 0 0 0
Continuing Operations [Member]                      
Total Assets:                      
Total assets 559,519       559,037       559,519 559,037  
Intersegment Eliminations [Member]                      
Net Sales:                      
Net sales                 (45,476) (45,108) (35,187)
Total Assets:                      
Total assets (322,866)       (335,958)       (322,866) (335,958)  
Electronics [Member]                      
Net Sales:                      
Net sales                 344,727 282,383 205,256
Operating Income (Loss)                      
Total operating income (loss)                 28,236 18,119 14,798
Depreciation and Amortization:                      
Total depreciation and amortization                 8,982 8,143 3,971
Interest Expense, net:                      
Total interest expense, net                 85 119 142
Capital Expenditures:                      
Capital expenditures                 5,965 8,158 5,665
Total Assets:                      
Total assets 265,838       252,324       265,838 252,324  
Electronics [Member] | Operating Segments [Member]                      
Net Sales:                      
Net sales                 381,853 321,884 238,617
Electronics [Member] | Inter-Segment Sales [Member]                      
Net Sales:                      
Net sales                 37,126 39,501 33,361
Control Devices [Member]                      
Net Sales:                      
Net sales                 441,297 447,528 408,132
Operating Income (Loss)                      
Total operating income (loss)                 64,191 72,555 61,815
Depreciation and Amortization:                      
Total depreciation and amortization                 11,914 10,887 10,276
Interest Expense, net:                      
Total interest expense, net                 76 103 226
Capital Expenditures:                      
Capital expenditures                 16,737 17,484 13,261
Total Assets:                      
Total assets 175,708       164,632       175,708 164,632  
Control Devices [Member] | Operating Segments [Member]                      
Net Sales:                      
Net sales                 449,645 452,572 409,958
Control Devices [Member] | Inter-Segment Sales [Member]                      
Net Sales:                      
Net sales                 8,348 5,044 1,826
Corporate [Member]                      
Operating Income (Loss)                      
Total operating income (loss)                 (30,412) (35,965) (29,069)
Depreciation and Amortization:                      
Total depreciation and amortization                 852 584 452
Interest Expense, net:                      
Total interest expense, net                 3,735 3,749 2,513
Capital Expenditures:                      
Capital expenditures                 3,083 2,697 2,337
Total Assets:                      
Total assets 359,837       377,657       359,837 377,657  
PST [Member]                      
Net Sales:                      
Net sales                 80,175 94,533 82,589
Operating Income (Loss)                      
Total operating income (loss)                 4,989 2,661 (3,462)
Depreciation and Amortization:                      
Total depreciation and amortization                 7,443 8,316 8,559
Interest Expense, net:                      
Total interest expense, net                 824 1,812 3,396
Capital Expenditures:                      
Capital expenditures                 3,242 3,831 3,213
Total Assets:                      
Total assets $ 81,002       $ 100,382       81,002 100,382  
PST [Member] | Operating Segments [Member]                      
Net Sales:                      
Net sales                 80,177 95,096 $ 82,589
PST [Member] | Inter-Segment Sales [Member]                      
Net Sales:                      
Net sales                 $ 2 $ 563