Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net sales	$ 456,976	$ 331,442	$ 1,285,491	$ 1,022,530
Costs and expenses
Cost of materials sold (excludes items shown separately below)	365,362	265,351	1,016,200	806,846
Warehouse and processing	25,330	20,531	72,579	65,870
Administrative and general	21,197	16,647	61,592	52,699
Distribution	12,552	10,574	38,077	31,507
Selling	7,373	6,797	21,708	19,804
Occupancy	2,348	2,150	7,200	6,651
Depreciation	3,953	3,883	12,141	12,516
Amortization	247	223	716	667
Total costs and expenses	438,362	326,156	1,230,213	996,560
Operating income	18,614	5,286	55,278	25,970
Other income (loss), net	17	(22)	(122)	(76)
Income before interest and income taxes	18,631	5,264	55,156	25,894
Interest and other expense on debt	2,923	1,966	7,579	5,380
Income before income taxes	15,708	3,298	47,577	20,514
Income tax provision	4,109	1,018	12,501	5,738
Net income and total comprehensive income	$ 11,599	$ 2,280	$ 35,076	$ 14,776
Earnings per share:
Net income per share - basic (in dollars per share)	$ 1.01	$ 0.20	$ 3.07	$ 1.30
Weighted average shares outstanding - basic (in shares)	11,444	11,386	11,427	11,384
Net income per share - diluted (in dollars per share)	$ 1.01	$ 0.20	$ 3.07	$ 1.30
Weighted average shares outstanding - diluted (in shares)	11,446	11,386	11,427	11,384
Dividends declared per share of common stock (in dollars per share)	$ 0.02	$ 0.02	$ 0.06	$ 0.06