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Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Net sales $ 452,917 $ 356,195 $ 828,515 $ 691,088
Costs and expenses        
Cost of materials sold (excludes items shown separately below) 356,061 283,041 650,838 541,495
Warehouse and processing 23,813 21,838 47,249 45,339
Administrative and general 21,523 17,887 40,396 36,052
Distribution 13,386 10,568 25,525 20,933
Selling 7,107 6,496 14,335 13,007
Occupancy 2,297 2,191 4,852 4,501
Depreciation 4,164 4,319 8,187 8,633
Amortization 247 222 469 444
Total costs and expenses 428,598 346,562 791,851 670,404
Operating income 24,319 9,633 36,664 20,684
Other loss, net (93) (28) (139) (54)
Income before interest and income taxes 24,226 9,605 36,525 20,630
Interest and other expense on debt 2,670 1,788 4,656 3,414
Income before income taxes 21,556 7,817 31,869 17,216
Income tax provision 5,708 3,020 8,392 4,720
Net income and total comprehensive income $ 15,848 $ 4,797 $ 23,477 $ 12,496
Earnings per share:        
Net income per share - basic (in dollars per share) $ 1.39 $ 0.42 $ 2.06 $ 1.10
Weighted average shares outstanding - basic (in shares) 11,435 11,383 11,419 11,382
Net income per share - diluted (in dollars per share) $ 1.39 $ 0.42 $ 2.06 $ 1.10
Weighted average shares outstanding - diluted (in shares) 11,435 11,390 11,419 11,387
Dividends declared per share of common stock (in dollars per share) $ 0.02 $ 0.02 $ 0.04 $ 0.04