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Consolidated Statements of Income - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement [Abstract]        
Net sales $ 90,275 $ 92,310 $ 167,043 $ 168,677
Cost of sales 63,158 64,434 118,128 118,955
Gross profit 27,117 27,876 48,915 49,722
Selling, general and administrative expenses 9,200 10,584 17,517 18,213
Gain on disposal of assets (30) 0 (25) (24)
Income from operations 17,947 17,292 31,423 31,533
Interest income, net 29 71 73 140
Other income (expense), net 27 34 (48) 13
Income before taxes 18,003 17,397 31,448 31,686
Income tax provision 6,873 6,034 11,919 10,501
Net income $ 11,130 $ 11,363 $ 19,529 $ 21,185
Earnings per share:        
Basic (usd per share) $ 0.21 $ 0.21 $ 0.36 $ 0.38
Diluted (usd per share) 0.20 0.20 0.36 0.38
Cash dividends declared per common share $ 0.11 $ 0.09 $ 0.11 $ 0.09
Weighted average shares outstanding:        
Basic (in shares) 54,208,362 55,004,175 54,205,657 55,036,281
Diluted (in shares) 54,669,763 55,568,212 54,714,604 55,603,979