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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Income Statement [Abstract]        
Service revenue $ 326,711 $ 292,849 $ 960,640 $ 806,397
Product revenue 137,521 132,871 418,484 408,246
Total revenue 464,232 425,720 1,379,124 1,214,643
Costs and expenses:        
Cost of services provided (excluding amortization of intangible assets) 219,368 200,118 640,904 543,588
Cost of products sold (excluding amortization of intangible assets) 67,660 69,332 203,655 204,270
Selling, general and administrative 92,863 85,650 278,886 269,067
Amortization of intangible assets 10,357 11,825 30,913 29,390
Operating income 73,984 58,795 224,766 168,328
Other income (expense):        
Interest income 134 523 497 1,008
Interest expense (7,667) (7,079) (22,053) (20,199)
Other income, net 6,488 1,017 24,692 10,059
Income from continuing operations, before income taxes 72,939 53,256 227,902 159,196
Provision for income taxes 19,945 15,565 73,272 48,385
Income from continuing operations, net of income taxes 52,994 37,691 154,630 110,811
Income (loss) from discontinued operations, net of income taxes (39) 342 (114) 328
Net income 52,955 38,033 154,516 111,139
Less: Net income attributable to noncontrolling interests 481 298 1,312 1,054
Net income attributable to common shareholders $ 52,474 $ 37,735 $ 153,204 $ 110,085
Basic:        
Continuing operations attributable to common shareholders (in dollars per share) $ 1.11 $ 0.79 $ 3.23 $ 2.34
Discontinued operations (in dollars per share) 0.00 0.01 0.00 0.00
Net income attributable to common shareholders (in dollars per share) 1.11 0.80 3.22 2.34
Diluted:        
Continuing operations attributable to common shareholders (in dollars per share) 1.09 0.78 3.17 2.29
Discontinued operations (in dollars per share) 0.00 0.01 0.00 0.01
Net income attributable to common shareholders (in dollars per share) $ 1.08 $ 0.79 $ 3.16 $ 2.30