Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Net sales	$ 187,369	$ 118,394	$ 361,798	$ 240,644
Cost of sales	132,375	75,821	256,391	155,588
Gross profit	54,994	42,573	105,407	85,056
Selling, general and administrative expenses	40,121	30,317	79,669	61,433
Gain on disposal of fixed assets	(996)	0	(996)	(7)
Gain on sale of notes receivable	0	0	0	(11,924)
Operating income	15,869	12,256	26,734	35,554
Interest expense, net	999	1,194	1,994	2,263
Income before income taxes	14,870	11,062	24,740	33,291
Income tax expense	3,795	2,694	6,360	8,197
Net income	$ 11,075	$ 8,368	$ 18,380	$ 25,094
Net income per common share:
Basic	$ 0.31	$ 0.23	$ 0.51	$ 0.70
Diluted	$ 0.30	$ 0.23	$ 0.51	$ 0.70