CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2015	Sep. 28, 2014	Sep. 27, 2015	Sep. 28, 2014
Income Statement [Abstract]
Net revenues	$ 443,714	$ 457,173	$ 1,325,189	$ 1,363,824
Cost of goods sold	215,501	221,007	641,102	662,411
Gross profit	228,213	236,166	684,087	701,413
Selling, general and administrative expenses	138,840	138,252	420,765	425,392
Research and development expenses	12,571	14,871	38,898	43,803
Restructuring charges	660	1,108	5,688	16,511
Gain on sale of assets	(408)	0	(408)	0
Income from continuing operations before interest, extinguishment of debt and taxes	76,550	81,935	219,144	215,707
Interest expense	14,306	17,184	47,685	48,650
Interest income	(130)	(161)	(453)	(494)
Loss on extinguishment of debt	0	0	10,454	0
Income from continuing operations before taxes	62,374	64,912	161,458	167,551
Taxes on income from continuing operations	803	9,684	15,415	28,224
Income from continuing operations	61,571	55,228	146,043	139,327
Operating loss from discontinued operations	(788)	(247)	(1,432)	(1,866)
(Benefit) taxes on loss from discontinued operations	(69)	24	180	(345)
Loss from discontinued operations	(719)	(271)	(1,612)	(1,521)
Net income	60,852	54,957	144,431	137,806
Less: Income from continuing operations attributable to noncontrolling interest	28	126	692	765
Net income attributable to common shareholders	$ 60,824	$ 54,831	$ 143,739	$ 137,041
Basic:
Income from continuing operations (in dollars per share)	$ 1.48	$ 1.33	$ 3.50	$ 3.35
Loss from discontinued operations (in dollars per share)	(0.02)	(0.01)	(0.04)	(0.04)
Net income (in dollars per share)	1.46	1.32	3.46	3.31
Diluted:
Income from continuing operations (in dollars per share)	1.27	1.18	3.03	3.00
Loss from discontinued operations (in dollars per share)	(0.02)	0.00	(0.03)	(0.04)
Net income (in dollars per share)	1.25	1.18	3.00	2.96
Dividends per share (in dollars per share)	$ 0.34	$ 0.34	$ 1.02	$ 1.02
Weighted average common shares outstanding
Basic (in shares)	41,597	41,399	41,542	41,347
Diluted (in shares)	48,532	46,628	47,969	46,256
Amounts attributable to common shareholders:
Income from continuing operations, net of tax	$ 61,543	$ 55,102	$ 145,351	$ 138,562
Loss from discontinued operations, net of tax	(719)	(271)	(1,612)	(1,521)
Net income attributable to common shareholders	$ 60,824	$ 54,831	$ 143,739	$ 137,041