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Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 29, 2013
Mar. 30, 2012
Condensed Consolidated Statements of Operations and Comprehensive Income [Abstract]    
Sales $ 148,265 $ 159,103
Cost of sales 99,516 112,215
Gross profit 48,749 46,888
Operating expenses:    
Selling, general and administrative expenses 20,092 19,034
Research, development and engineering costs, net 11,080 13,911
Other operating (income) expense, net 3,238 2,745
Total operating expenses 34,410 35,690
Operating income (loss) 14,339 11,198
Interest expense 6,988 4,359
Other (income) expense 285 720
Income before provision for income taxes 7,066 6,119
Provision for income taxes 1,403 1,652
Net income (loss) 5,663 4,467
Earnings per share:    
Basic $ 0.24 $ 0.19
Diluted $ 0.23 $ 0.19
Weighted average shares outstanding:    
Basic 23,750 23,420
Diluted 24,415 23,848
Comprehensive income (loss):    
Net income (loss) 5,663 4,467
Foreign currency translation gain (loss) (3,063) 4,038
Net change in cash flow hedges, net of tax 269 525
Defined benefit plan liability adjustment, net of tax 597 0
Total other comprehensive income (loss) (2,197) 4,563
Comprehensive income (loss) $ 3,466 $ 9,030