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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 26, 2016
Mar. 28, 2015
Income Statement [Abstract]    
Service revenue $ 220,701 $ 196,780
Product revenue 134,167 123,634
Total revenue 354,868 320,414
Costs and expenses:    
Cost of services provided (excluding amortization of intangible assets) 147,349 136,306
Cost of products sold (excluding amortization of intangible assets) 66,751 64,448
Selling, general and administrative 82,944 71,397
Amortization of intangible assets 6,352 5,258
Operating income 51,472 43,005
Other income (expense):    
Interest income 263 284
Interest expense (4,211) (3,024)
Other income (expense), net 4,026 (8,313)
Income from continuing operations, before income taxes 51,550 31,952
Provision for income taxes 13,975 331
Income from continuing operations, net of income taxes 37,575 31,621
Loss from discontinued operations, net of income taxes (26) (7)
Net income 37,549 31,614
Less: Net income attributable to noncontrolling interests (406) (73)
Net income attributable to common shareholders $ 37,143 $ 31,541
Basic:    
Continuing operations attributable to common shareholders (in dollars per share) $ 0.80 $ 0.67
Discontinued operations (in dollars per share) 0.00 0.00
Net income attributable to common shareholders (in dollars per share) 0.80 0.67
Diluted:    
Continuing operations attributable to common shareholders (in dollars per share) 0.78 0.66
Discontinued operations (in dollars per share) 0.00 0.00
Net income attributable to common shareholders (in dollars per share) $ 0.78 $ 0.66