Consolidated Statements of Income (unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Consolidated Statements of Income (unaudited) [Abstract]
Net sales	$ 96,800	$ 83,349	$ 281,767	$ 238,392
Cost of sales	53,984	47,138	157,304	134,577
Gross profit	42,816	36,211	124,463	103,815
Selling, general, and administrative expenses	29,784	23,253	79,455	66,314
Operating income	13,032	12,958	45,008	37,501
Interest expense, net	3,641	3,702	11,233	10,811
Investment income	(265)	(89)	(527)	(328)
Loss on extinguishment of debt	1,158	0	1,308	2,384
Net periodic benefit (income), excluding service cost	(12)	(45)	(34)	176
Income before income taxes	8,510	9,390	33,028	24,458
Income tax expense	2,236	1,436	6,989	4,153
Consolidated net income	$ 6,274	$ 7,954	$ 26,039	$ 20,305
Basic income per common share:
Consolidated net income (in dollars per share)	$ 0.32	$ 0.41	$ 1.33	$ 1.05
Diluted income per common share:
Consolidated net income (in dollars per share)	$ 0.31	$ 0.40	$ 1.32	$ 1.03
Weighted average common shares outstanding:
Basic (in shares)	19,659,217	19,378,054	19,613,868	19,290,096
Diluted (in shares)	20,067,413	19,882,994	19,777,163	19,767,667