Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Total net sales	$ 200,933	$ 172,890	$ 351,402	$ 295,344
Total cost of sales	163,805	139,827	285,112	240,089
Gross profit	37,128	33,063	66,290	55,255
Selling and administrative expenses	22,855	23,368	44,772	43,826
Amortization expense	1,679	1,775	3,391	3,560
Interest expense - net	1,597	1,630	2,952	3,517
Other (income) expense - net	(252)	128	(402)	(477)
Total expenses	25,879	26,901	50,713	50,426
Income before income taxes	11,249	6,162	15,577	4,829
Income tax expense	1,685	728	2,323	1,253
Net income	$ 9,564	$ 5,434	$ 13,254	$ 3,576
Basic earnings per common share (usd per share)	$ 0.92	$ 0.52	$ 1.27	$ 0.35
Diluted earnings per common share (usd per share)	$ 0.90	$ 0.52	$ 1.25	$ 0.34
Product
Total net sales	$ 160,227	$ 127,093	$ 273,310	$ 218,904
Total cost of sales	132,438	105,297	224,769	180,433
Service
Total net sales	40,706	45,797	78,092	76,440
Total cost of sales	$ 31,367	$ 34,530	$ 60,343	$ 59,656