CONDENSED CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018
Income Statement [Abstract]
Net revenues	$ 652,507	$ 609,866	$ 1,266,091	$ 1,197,096
Cost of goods sold	279,583	265,088	548,425	521,048
Gross profit	372,924	344,778	717,666	676,048
Selling, general and administrative expenses	236,186	229,917	463,879	445,254
Research and development expenses	27,595	26,018	54,745	52,045
Restructuring and impairment charges	1,685	55,353	19,080	58,416
Gain on sale of assets	0	0	(2,739)	0
Income from continuing operations before interest and taxes	107,458	33,490	182,701	120,333
Interest expense	20,758	26,649	43,450	52,592
Interest income	(472)	(183)	(811)	(456)
Income from continuing operations before taxes	87,172	7,024	140,062	68,197
Taxes on income from continuing operations	3,844	9,576	14,816	15,818
Income from continuing operations	83,328	(2,552)	125,246	52,379
Operating income (loss) from discontinued operations	61	94	(1,282)	1,329
Tax (benefit) on income (loss) from discontinued operations	14	38	(308)	20
Income (loss) from discontinued operations	47	56	(974)	1,309
Net income (loss)	$ 83,375	$ (2,496)	$ 124,272	$ 53,688
Basic:
Income from continuing operations (in dollars per share)	$ 1.80	$ (0.06)	$ 2.72	$ 1.15
Income (loss) from discontinued operations (in dollars per share)	0.01	0.01	(0.02)	0.03
Net income (in dollars per share)	1.81	(0.05)	2.70	1.18
Diluted:
Income from continuing operations (in dollars per share)	1.77	(0.06)	2.67	1.12
Loss from discontinued operations (in dollars per share)	0	0.01	(0.03)	0.03
Net income (in dollars per share)	$ 1.77	$ (0.05)	$ 2.64	$ 1.15
Weighted average common shares outstanding
Basic (in shares)	46,172	45,581	46,111	45,455
Diluted (in shares)	47,036	45,581	46,989	46,771