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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Income Statement [Abstract]        
Net sales $ 94,360 $ 102,917 $ 261,403 $ 271,594
Cost of sales 64,175 69,567 182,303 188,522
Gross profit 30,185 33,350 79,100 83,072
Selling, general and administrative expenses 10,062 13,830 27,579 32,043
Gain on disposal of assets (34) 0 (59) (24)
Income from operations 20,157 19,520 51,580 51,053
Interest income, net 14 55 87 195
Other expense, net (58) (43) (106) (30)
Income before taxes 20,113 19,532 51,561 51,218
Income tax provision 6,862 7,092 18,781 17,593
Net income $ 13,251 $ 12,440 $ 32,780 $ 33,625
Earnings per share:        
Basic (usd per share) $ 0.24 $ 0.23 $ 0.61 $ 0.61
Diluted (usd per share) 0.24 0.22 0.60 0.61
Cash dividends declared per common share $ 0 $ 0 $ 0.11 $ 0.09
Weighted average shares outstanding:        
Basic (in shares) 54,209,942 54,905,288 54,160,649 54,851,911
Diluted (in shares) 54,579,590 55,484,043 54,623,163 55,423,294