Quarterly Information-Unaudited (Tables)

12 Months Ended

Dec. 31, 2018

Selected Quarterly Financial Information [Abstract]

Quartely Information

	Fiscal quarter ended
(In thousands, except per share data)	March 31, 2018		June 30, 2018		September 29, 2018		December 31, 2018
Net sales	$	367,199	$	383,059	$	398,597	$	401,642
Gross profit	175,997		182,378		181,716		179,740
Net income	57,562		54,349		48,060		80,784
Basic net income per common share	0.41		0.38		0.34		0.58
Diluted net income per common share	0.40		0.38		0.34		0.57

	Fiscal quarter ended
(In thousands, except per share data)	April 1, 2017		July 1, 2017		September 30, 2017		December 31, 2017
Net sales	$	317,377	$	329,002	$	345,591	$	350,562
Gross profit	139,596		150,303		155,407		163,679
Net income (loss)	32,514		39,991		40,902		(28,341		)
Basic net income (loss) per common share	0.23		0.28		0.29		(0.20		)
Diluted net income (loss) per common share	0.23		0.28		0.28		(0.20		)