Consolidated Statement of Income Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net sales	$ 224,910	$ 213,370	$ 442,010	$ 413,200
Cost of sales	(160,130)	(153,900)	(316,850)	(301,910)
Gross profit	64,780	59,470	125,160	111,290
Selling, general and administrative expenses	(33,260)	(33,050)	(58,430)	(68,960)
Operating profit	31,520	26,420	66,730	42,330
Other expense, net:
Interest expense	(3,480)	(3,420)	(7,180)	(6,970)
Other expense, net	(2,180)	(140)	(2,740)	(920)
Other expense, net	(5,660)	(3,560)	(9,920)	(7,890)
Income before income tax expense	25,860	22,860	56,810	34,440
Income tax expense	(6,260)	(8,010)	(12,890)	(12,600)
Net income	$ 19,600	$ 14,850	$ 43,920	$ 21,840
Basic earnings per share
Net income per share	$ 0.43	$ 0.32	$ 0.96	$ 0.48
Weighted average common shares—basic	45,920,307	45,717,697	45,850,137	45,644,096
Diluted earnings per share
Net income per share	$ 0.42	$ 0.32	$ 0.95	$ 0.48
Weighted average common shares—diluted	46,200,757	45,922,416	46,215,047	45,915,687