Consolidated Statements of Operations (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Income Statement [Abstract]    
Net sales $ 665,281 $ 644,039
Cost of products sold 493,564 477,378
Gross profit 171,717 166,661
Operating expenses    
Marketing and selling expenses 47,009 44,128
Administrative expenses 27,786 25,977
Research and development expenses 3,052 2,482
Other expense (income), net 5,401 3,983
Total operating (income) expenses 83,248 76,570
Earnings before interest and taxes 88,469 90,091
Interest expense 21,628 24,367
Interest income 153 26
Earnings before income taxes 66,994 65,750
Provision for income taxes 25,458 25,002
Net earnings $ 41,536 $ 40,748
Net loss per share    
Basic (in dollars per share) $ 0.36 $ 0.35
Weighted average shares outstanding- basic (in shares) 115,906,031 115,592,299
Diluted (in dollars per share) $ 0.35 $ 0.35
Weighted average shares outstanding- diluted (in shares) 117,036,406 116,686,901
Dividends per share $ 0.235 $ 0.21