Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total net sales	$ 150,469	$ 122,454
Total cost of sales	121,307	100,262
Gross profit	29,162	22,192
Selling and administrative expenses	21,917	20,458
Amortization expense	1,712	1,785
Interest expense - net	1,355	1,887
Other income	(150)	(605)
Total expenses	24,834	23,525
Income (loss) before income taxes	4,328	(1,333)
Income tax expense	638	525
Net income (loss)	$ 3,690	$ (1,858)
Basic earnings (loss) per common share (usd per share)	$ 0.36	$ (0.18)
Diluted earnings (loss) per common share (usd per share)	$ 0.35	$ (0.18)
Product
Total net sales	$ 113,083	$ 91,811
Total cost of sales	92,331	75,136
Service
Total net sales	37,386	30,643
Total cost of sales	$ 28,976	$ 25,126