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Quarterly Sales and Earnings Data - Unaudited (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 28, 2018
Sep. 28, 2018
Jun. 29, 2018
Mar. 30, 2018
Dec. 29, 2017
Sep. 29, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Quarterly Financial Information Disclosure [Abstract]                      
Sales $ 303,034 $ 305,088 $ 314,464 $ 292,426 $ 302,260 $ 286,168 $ 280,916 $ 266,736 $ 1,215,012 $ 1,136,080 $ 1,075,502
Gross Profit 88,445 91,923 98,765 83,532 93,621 89,186 89,175 82,028 362,665 354,010 337,679
Net income (loss) $ 19,196 $ (8,303) $ 23,056 $ 13,084 $ 54,698 $ 19,882 $ 9,559 $ 2,948 $ 167,964 $ 66,679 $ 5,961
Basic (in dollars per share) $ 0.59 $ (0.26) $ 0.72 $ 0.41 $ 1.73 $ 0.63 $ 0.31 $ 0.10 $ 5.23 $ 2.12 $ 0.19
Earnings Per Share, Diluted $ 0.58 $ (0.26) $ 0.70 $ 0.40 $ 1.69 $ 0.62 $ 0.30 $ 0.09 $ 5.15 $ 2.08 $ 0.19