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Condensed Consolidated Statements of Operations and Comprehensive Income - Unaudited - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2017 | Apr. 01, 2016
Income Statement [Abstract] |  |
Sales | $ 345,413 | $ 332,238
Cost of sales | 254,187 | 240,770
Gross profit | 91,226 | 91,468
Operating expenses: |  |
Selling, general and administrative expenses | 39,499 | 41,888
Research, development and engineering costs, net | 13,411 | 17,306
Other operating expenses, net | 11,771 | 21,140
Total operating expenses | 64,681 | 80,334
Operating income | 26,545 | 11,134
Interest expense, net | 28,893 | 27,617
Other expense (income), net | 1,847 | (3,721)
Loss before provision (benefit) for income taxes | (4,195) | (12,762)
Provision (benefit) for income taxes | 144 | (102)
Net loss | $ (4,339) | $ (12,660)
Loss per share: |  |
Basic | $ (0.14) | $ (0.41)
Diluted | $ (0.14) | $ (0.41)
Weighted average shares outstanding: |  |
Basic | 31,016 | 30,718
Diluted | 31,016 | 30,718
Comprehensive Income |  |
Net loss | $ (4,339) | $ (12,660)
Foreign currency translation gain | 6,536 | 18,760
Net change in cash flow hedges, net of tax | 1,750 | 367
Other comprehensive income | 8,286 | 19,127
Comprehensive income | $ 3,947 | $ 6,467

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