Consolidated Statements of Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Net sales	$ 1,715,081		$ 1,330,696		$ 1,055,116
Costs and expenses
Cost of materials sold (excludes items shown separately below)	1,372,954		1,055,212		820,040
Warehouse and processing	97,565		87,425		79,521
Administrative and general	81,107		69,659		63,054
Distribution	50,347		41,789		36,490
Selling	29,020		26,285		23,060
Occupancy	9,428		8,862		8,718
Depreciation	16,645		16,589		17,596
Amortization	963		889		889
Total costs and expenses	1,658,029		1,306,710		1,049,368
Operating income	57,052	[1]	23,986	[2]	5,748
Other loss, net	(307)		(118)		(55)
Income before interest and income taxes	56,745		23,868		5,693
Interest and other expense on debt	10,681		7,518		5,273
Income before income taxes	46,064		16,350		420
Income tax provision (benefit)	12,305		(2,613)		1,498
Net income (loss)	33,759	[3]	18,963	[3]	(1,078)
Gain on cash flow hedges					114
Tax effect of hedges					(44)
Total comprehensive income (loss)	$ 33,759		$ 18,963		$ (1,008)
Net income (loss) per share - basic (in dollars per share)	$ 2.95		$ 1.67		$ (0.10)
Weighted average shares outstanding - basic (in shares)	11,432		11,381		11,210
Net income (loss) per share - diluted (in dollars per share)	$ 2.95		$ 1.67		$ (0.10)
Weighted average shares outstanding - diluted (in shares)	11,440		11,381		11,210
Dividends declared per share of common stock (in dollars per share)	$ 0.08		$ 0.08		$ 0.08

[1] Operating income (loss) in 2018 includes $8,408 of LIFO expense related to the Company's tubular and pipe products segment.

[2] Operating income (loss) in 2017 includes $2,707 of LIFO expense related to the Company's tubular and pipe products segment.

[3] Includes a $6.2 million tax benefit related to the U.S. Tax Cuts and Jobs Act.