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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jul. 01, 2012
Apr. 01, 2012
Dec. 31, 2011
Oct. 02, 2011
Jul. 03, 2011
Apr. 03, 2011
Dec. 31, 2012
Dec. 31, 2011
Net revenue from unaffiliated customers:                    
Net revenue from unaffiliated customers $ 67,466 $ 78,763 $ 98,912 $ 96,463 $ 83,580 $ 91,177 $ 85,058 $ 75,810 $ 341,604 $ 335,625
Gross profit:                    
Gross profit 8,638 9,374 13,223 12,514 8,707 10,263 8,111 8,148 43,749 35,229
Operating income (loss):                    
Operating income (loss) (559) 635 4,468 4,503 517 1,554 219 3,894 9,047 6,184
Income (loss) from continuing operations before income taxes:                    
Income (loss) from continuing operations before income taxes:                 12,515 11,056
Depreciation and amortization:                    
Depreciation and amortization                 12,251 14,216
Capital expenditures:                    
Capital expenditures                 7,082 6,848
Total assets:                    
Total assets 160,968       175,725       160,968 175,725
Total liabilities:                    
Total liabilities 98,035       115,257       98,035 115,257
Industrial Group [Member]
                    
Net revenue from unaffiliated customers:                    
Net revenue from unaffiliated customers                 286,046 273,305
Gross profit:                    
Gross profit                 30,981 27,343
Operating income (loss):                    
Operating income (loss)                 20,270 20,599
Income (loss) from continuing operations before income taxes:                    
Income (loss) from continuing operations before income taxes:                 24,237 27,132
Depreciation and amortization:                    
Depreciation and amortization                 10,831 12,191
Capital expenditures:                    
Capital expenditures                 5,839 5,319
Total assets:                    
Total assets 114,268       128,386       114,268 128,386
Total liabilities:                    
Total liabilities 66,679       90,669       66,679 90,669
Electronics Group [Member]
                    
Net revenue from unaffiliated customers:                    
Net revenue from unaffiliated customers                 55,558 62,320
Gross profit:                    
Gross profit                 12,768 7,886
Operating income (loss):                    
Operating income (loss)                 (2,668) (5,785)
Income (loss) from continuing operations before income taxes:                    
Income (loss) from continuing operations before income taxes:                 (2,673) (5,656)
Depreciation and amortization:                    
Depreciation and amortization                 1,252 1,856
Capital expenditures:                    
Capital expenditures                 1,139 1,382
Total assets:                    
Total assets 38,852       32,277       38,852 32,277
Total liabilities:                    
Total liabilities 11,063       8,336       11,063 8,336
General, corporate and other [Member]
                    
Operating income (loss):                    
Operating income (loss)                 (8,555) (8,630)
Income (loss) from continuing operations before income taxes:                    
Income (loss) from continuing operations before income taxes:                 (9,049) (10,420)
Depreciation and amortization:                    
Depreciation and amortization                 168 169
Capital expenditures:                    
Capital expenditures                 104 147
Total assets:                    
Total assets 7,848       15,062       7,848 15,062
Total liabilities:                    
Total liabilities $ 20,293       $ 16,252       $ 20,293 $ 16,252