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Revenue (Revenue by Segment and Geographical Location) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Disaggregation of Revenue [Line Items]        
Total net sales $ 208,853 $ 203,582 $ 655,385 $ 617,004
North America [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 119,475 113,402 364,789 358,275
South America [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 18,864 25,386 59,742 70,519
Europe [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 62,489 55,199 205,004 164,179
Asia Pacific [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 8,025 9,595 25,850 24,031
Control Devices [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 108,402 106,842 333,715 339,716
Control Devices [Member] | North America [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 97,017 96,314 300,024 312,320
Control Devices [Member] | Europe [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 4,174 2,009 10,734 5,657
Control Devices [Member] | Asia Pacific [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 7,211 8,519 22,957 21,739
Electronics [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 81,587 71,354 261,928 206,769
Electronics [Member] | North America [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 22,458 17,088 64,765 45,955
Electronics [Member] | Europe [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 58,315 53,190 194,270 158,522
Electronics [Member] | Asia Pacific [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 814 1,076 2,893 2,292
PST [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 18,864 25,386 59,742 70,519
PST [Member] | South America [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales $ 18,864 $ 25,386 $ 59,742 $ 70,519