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Segment Reporting (Schedule of Segment Reporting Information, by Segment) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Net Sales:          
Total net sales $ 162,099 $ 169,833 $ 323,430 $ 328,695  
Income (Loss) Before Income Taxes:          
Total operating income (loss) (23,221) 11,752 (16,787) 20,243  
Total income before income taxes (28,479) 7,188 (28,652) 11,047  
Interest Expense, net:          
Interest expense, net 5,072 4,504 10,001 8,954  
Capital Expenditures:          
Capital expenditures     12,605 10,701  
Total Assets:          
Total assets 583,608   583,608   588,322
Goodwill impairment 29,300    29,300     
Continuing Operations [Member]
          
Net Sales:          
Total net sales 162,099 169,833 323,430 328,695  
Depreciation and Amortization:          
Total depreciation and amortization 7,007 [1] 7,412 [1] 13,692 [1] 15,106 [1]  
Interest Expense, net:          
Interest expense, net 5,072 4,504 10,001 8,954  
Capital Expenditures:          
Capital expenditures 7,657 3,895 11,764 9,197  
Total Assets:          
Total assets 477,261   477,261   491,353
Operating Segments [Member] | Continuing Operations [Member]
          
Income (Loss) Before Income Taxes:          
Total operating income (loss) (23,221) 11,752 (16,787) 20,243  
Intersegment Eliminations [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales (12,315) (11,623) (24,823) (23,285)  
Total Assets:          
Total assets (264,083)   (264,083)   (259,267)
Electronics [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 64,339 59,533 126,187 114,919  
Electronics [Member] | Operating Segments [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 52,766 48,684 102,857 93,204  
Income (Loss) Before Income Taxes:          
Total operating income (loss) 4,886 5,283 9,668 10,529  
Depreciation and Amortization:          
Total depreciation and amortization 1,138 1,242 2,239 2,521  
Interest Expense, net:          
Interest expense, net 232 186 432 373  
Capital Expenditures:          
Capital expenditures 2,019 519 2,666 988  
Total Assets:          
Total assets 111,599   111,599   105,352
Electronics [Member] | Intersegment Eliminations [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 11,573 10,849 23,330 21,715  
Control Devices [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 77,155 75,208 155,230 147,917  
Control Devices [Member] | Operating Segments [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 76,413 74,434 153,737 146,347  
Income (Loss) Before Income Taxes:          
Total operating income (loss) 8,719 8,963 17,152 16,619  
Depreciation and Amortization:          
Total depreciation and amortization 2,381 2,470 4,752 5,005  
Interest Expense, net:          
Interest expense, net 73 32 133 79  
Capital Expenditures:          
Capital expenditures 3,528 1,657 5,262 4,897  
Total Assets:          
Total assets 117,384   117,384   105,730
Control Devices [Member] | Intersegment Eliminations [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 742 774 1,493 1,570  
Corporate [Member] | Continuing Operations [Member]
          
Interest Expense, net:          
Interest expense, net 3,975 4,004 7,976 7,943  
Capital Expenditures:          
Capital expenditures 48 93 107 220  
Total Assets:          
Total assets 292,967 [2]   292,967 [2]   301,889 [2]
Corporate [Member] | Operating Segments [Member] | Continuing Operations [Member]
          
Income (Loss) Before Income Taxes:          
Total operating income (loss) (4,844) [3] (4,772) [3] (9,083) [3] (10,179) [3]  
Depreciation and Amortization:          
Total depreciation and amortization 35 46 79 94  
PST [Member]
          
Total Assets:          
Goodwill impairment 29,300   29,300    
PST [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 32,920 46,715 66,836 89,144  
PST [Member] | Operating Segments [Member] | Continuing Operations [Member]
          
Net Sales:          
Total net sales 32,920 46,715 66,836 89,144  
Income (Loss) Before Income Taxes:          
Total operating income (loss) (31,982) [4] 2,278 [4] (34,524) [4] 3,274 [4]  
Depreciation and Amortization:          
Total depreciation and amortization 3,453 3,654 6,622 7,486  
Interest Expense, net:          
Interest expense, net 792 282 1,460 559  
Capital Expenditures:          
Capital expenditures 2,062 1,626 3,729 3,092  
Total Assets:          
Total assets 219,394   219,394   237,649
PST [Member] | Intersegment Eliminations [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, accounting, finance, legal, information technology costs as well as share-based compensation.
[4] The PST operating loss for the three and six months ended June 30, 2014 includes a goodwill impairment charge of $29,300.