CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018
Total revenue	$ 604,569	$ 493,970
Costs and expenses:
Selling, general and administrative	122,574	103,372
Amortization of intangible assets	19,411	10,268
Operating income	69,792	67,829
Other income (expense):
Interest income	179	282
Interest expense	(9,987)	(11,191)
Other income, net	6,306	6,120
Income from continuing operations, before income taxes	66,290	63,040
Provision for income taxes	10,602	9,772
Income from continuing operations, net of income taxes	55,688	53,268
Loss from discontinued operations, net of income taxes	0	(23)
Net income	55,688	53,245
Less: Net income attributable to noncontrolling interests	555	614
Net income attributable to common shareholders	$ 55,133	$ 52,631
Basic:
Continuing operations attributable to common shareholders (in dollars per share)	$ 1.14	$ 1.10
Discontinued operations (in dollars per share)	0.00	0.00
Net income attributable to common shareholders (in dollars per share)	1.14	1.10
Diluted:
Continuing operations attributable to common shareholders (in dollars per share)	1.11	1.08
Discontinued operations (in dollars per share)	0.00	0.00
Net income attributable to common shareholders (in dollars per share)	$ 1.11	$ 1.08
Weighted-average shares outstanding—Basic (in shares)	48,458	47,785
Weighted-average shares outstanding—Diluted (in shares)	49,462	48,828
Service
Total revenue	$ 450,942	$ 345,454
Costs and expenses:
Cost of services provided (excluding amortization of intangible assets)	316,800	243,808
Product
Total revenue	153,627	148,516
Costs and expenses:
Cost of services provided (excluding amortization of intangible assets)	$ 75,992	$ 68,693