Annual report pursuant to Section 13 and 15(d)

Unaudited Quarterly Financial Information (Details)

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Unaudited Quarterly Financial Information (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 29, 2012
Sep. 29, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Oct. 01, 2011
Jul. 02, 2011
Apr. 02, 2011
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Unaudited Quarterly Financial Information                      
Net sales $ 43,237 $ 48,825 $ 57,031 $ 55,274 $ 45,657 $ 53,041 $ 54,770 $ 50,703 $ 204,367 $ 204,171 $ 150,695
Gross profit 15,988 19,397 22,969 22,218 16,848 20,748 21,674 19,942 80,572 79,215 52,343
Operating income 9,486 13,195 16,464 15,264 10,472 15,499 15,384 13,911 54,409 55,269 31,039
Income before income taxes 9,656 13,593 16,863 15,741 10,614 16,982 15,571 14,417 55,853 57,586 31,643
Net income $ 6,693 $ 8,835 $ 11,247 $ 10,623 $ 6,074 $ 11,394 $ 10,437 $ 9,770 $ 37,398 $ 37,677 $ 21,400
Basic net income per common share $ 0.26 $ 0.34 $ 0.43 $ 0.41 $ 0.24 $ 0.44 $ 0.41 $ 0.38 $ 1.44 $ 1.47 $ 0.84
Diluted net income per common share $ 0.26 $ 0.34 $ 0.43 $ 0.41 $ 0.24 $ 0.44 $ 0.41 $ 0.38 $ 1.44 $ 1.47 $ 0.84