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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Income Statement [Abstract]    
Service revenue $ 345,454 $ 304,531
Product revenue 148,516 141,232
Total revenue 493,970 445,763
Costs and expenses:    
Cost of services provided (excluding amortization of intangible assets) 243,808 207,167
Cost of products sold (excluding amortization of intangible assets) 68,693 67,244
Selling, general and administrative 103,372 90,909
Amortization of intangible assets 10,268 10,737
Operating income 67,829 69,706
Other income (expense):    
Interest income 282 202
Interest expense (11,191) (6,983)
Other income, net 6,120 15,122
Income from continuing operations, before income taxes 63,040 78,047
Provision for income taxes 9,772 31,084
Income from continuing operations, net of income taxes 53,268 46,963
Loss from discontinued operations, net of income taxes (23) (4)
Net income 53,245 46,959
Less: Net income attributable to noncontrolling interests 614 181
Net income attributable to common shareholders $ 52,631 $ 46,778
Basic:    
Continuing operations attributable to common shareholders (in dollars per share) $ 1.10 $ 0.98
Discontinued operations (in dollars per share) 0.00 0.00
Net income attributable to common shareholders (in dollars per share) 1.10 0.98
Diluted:    
Continuing operations attributable to common shareholders (in dollars per share) 1.08 0.97
Discontinued operations (in dollars per share) 0.00 0.00
Net income attributable to common shareholders (in dollars per share) $ 1.08 $ 0.97