Interim Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2017

Quarterly Financial Information Disclosure [Abstract]

Summary of Interim Financial Data

	Three Months Ended
	December 31, 2017		September 30, 2017		June 30, 2017		March 31, 2017		December 31, 2016		September 30, 2016		June 30, 2016		March 31, 2016
	(In thousands, except share and per share data)
Net sales	$	122,212	$	140,194	$	157,941	$	144,806	$	95,322	$	106,168	$	146,450	$	131,676
Gross profit	$	50,906	$	55,284	$	72,014	$	65,169	$	38,113	$	29,945	$	61,410	$	57,627
Net income	$	18,299	$	20,098	$	28,782	$	27,949	$	12,629	$	7,787	$	23,725	$	23,706
Basic net income per share	$	0.62	$	0.68	$	0.98	$	0.95	$	0.43	$	0.27	$	0.81	$	0.80
Basic weighted average common shares outstanding		29,412,848		29,404,049		29,389,458		29,363,210		29,318,915		29,295,284		29,264,362		29,697,722
Diluted net income per share	$	0.62	$	0.68	$	0.97	$	0.95	$	0.43	$	0.26	$	0.80	$	0.79
Diluted weighted average common shares outstanding		29,611,129		29,578,216		29,550,418		29,561,406		29,543,842		29,516,718		29,477,870		29,910,292