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Consolidated Statements of Income - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Income Statement [Abstract]    
Net sales $ 99,082 $ 86,078
Cost of sales 83,692 61,092
Gross profit 15,390 24,986
Selling, general and administrative expenses 10,219 10,530
(Gain) loss on disposal of assets (7) (1)
Income from operations 5,178 14,457
Interest income, net 68 60
Other (expense) income, net (6) 11
Income before taxes 5,240 14,528
Income tax provision 980 4,311
Net income $ 4,260 $ 10,217
Earnings per share:    
Basic (usd per share) $ 0.08 $ 0.19
Diluted (usd per share) $ 0.08 $ 0.19
Weighted average shares outstanding:    
Basic (in shares) 52,433,902 52,622,539
Diluted (in shares) 52,910,223 53,190,057