Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Oct. 02, 2015
Sep. 30, 2016
Oct. 02, 2015
Income Statement [Abstract]        
Net sales $ 453,474 $ 433,742 $ 1,375,314 $ 1,322,848
Cost of sales 317,984 303,816 961,628 933,059
Gross profit 135,490 129,926 413,686 389,789
Selling, general and administrative expenses 104,404 100,153 334,417 307,660
Net (gain)/loss on sale of assets 24 (10) 10 (415)
Operating income 31,062 29,783 79,259 82,544
Interest expense, net 4,165 3,208 11,960 9,757
Other expense (income), net (332) 185 243 120
Earnings before income taxes 27,229 26,390 67,056 72,667
Income tax expense 9,774 9,166 23,329 21,003
Net earnings $ 17,455 $ 17,224 $ 43,727 $ 51,664
Earnings per share:        
Basic earnings per share (in usd per share) $ 0.64 $ 0.63 $ 1.61 $ 1.90
Diluted earnings per share (in usd per share) $ 0.62 $ 0.62 $ 1.56 $ 1.85
Average shares outstanding:        
Basic (in shares) 27,128 27,179 27,096 27,203
Diluted (in shares) 28,080 27,770 27,943 27,915
Dividends declared per share (in usd per share) $ 0.18 $ 0.18 $ 0.54 $ 0.54