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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Net sales $ 375,598 $ 334,893
Costs and expenses    
Cost of materials sold (excludes items shown seperately below) 294,777 258,454
Warehouse and processing 23,436 23,501
Administrative and general 18,872 18,165
Distribution 12,139 10,365
Selling 7,228 6,511
Occupancy 2,555 2,310
Depreciation 4,024 4,314
Amortization 222 222
Total costs and expenses 363,253 323,842
Operating income 12,345 11,051
Other loss, net 46 26
Income before interest and income taxes 12,299 11,025
Interest and other expense on debt 1,986 1,626
Income before income taxes 10,313 9,399
Income tax provision 2,684 1,700
Net income and total comprehensive income $ 7,629 $ 7,699
Earnings per share:    
Net income per share - basic (in dollars per share) $ 0.67 $ 0.68
Weighted average shares outstanding - basic (in shares) 11,418 11,369
Net income per share - diluted (in dollars per share) $ 0.67 $ 0.68
Weighted average shares outstanding - diluted (in shares) 11,418 11,369
Dividends declared per share of common stock (in dollars per share) $ 0.02 $ 0.02