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Unaudited Condensed Consolidated Statements of Operations - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Income Statement [Abstract]        
Net sales $ 240,407 $ 231,150 $ 483,962 $ 462,413
Cost of sales 163,131 155,577 330,002 314,162
Gross profit 77,276 75,573 153,960 148,251
Selling and administrative expense 72,653 71,146 145,115 140,050
Operating income 4,623 4,427 8,845 8,201
Interest expense 412 371 815 805
Income before income taxes 4,211 4,056 8,030 7,396
Income taxes 1,633 1,521 3,138 2,801
Net income $ 2,578 $ 2,535 $ 4,892 $ 4,595
Earnings per share:        
Basic $ 0.12 $ 0.12 $ 0.22 $ 0.21
Diluted 0.12 0.11 0.22 0.21
Dividends per share $ 0.10 $ 0.10 $ 0.20 $ 0.20
Weighted-average shares of common stock outstanding:        
Basic 21,835 21,985 21,822 21,982
Diluted 21,965 22,113 22,012 22,198