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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Income Statement [Abstract]        
Service revenue $ 214,380 $ 211,003 $ 411,160 $ 383,348
Product revenue 125,193 130,176 248,827 257,199
Total revenue 339,573 341,179 659,987 640,547
Costs and expenses:        
Cost of services provided 144,143 147,954 280,449 271,923
Cost of products sold 62,647 67,591 127,095 134,177
Selling, general and administrative 71,331 67,756 142,728 132,523
Amortization of intangible assets 5,717 6,853 10,975 11,193
Operating income 55,735 51,025 98,740 90,731
Other income (expense):        
Interest income 297 222 581 427
Interest expense (4,376) (3,373) (7,400) (6,174)
Other income (expense), net 8,672 2,667 359 8,543
Income from continuing operations, before income taxes 60,328 50,541 92,280 93,527
Provision for income taxes 11,076 14,081 11,407 24,439
Income from continuing operations, net of income taxes 49,252 36,460 80,873 69,088
Loss from discontinued operations, net of income taxes (7) (644) (14) (914)
Net income 49,245 35,816 80,859 68,174
Less: Net income attributable to noncontrolling interests (736) (552) (809) (678)
Net income attributable to common shareholders $ 48,509 $ 35,264 $ 80,050 $ 67,496
Basic:        
Continuing operations attributable to common shareholders (in dollars per share) $ 1.04 $ 0.76 $ 1.71 $ 1.46
Discontinued operations (in dollars per share) 0.00 (0.01) 0.00 (0.02)
Net income attributable to common shareholders (in dollars per share) 1.04 0.75 1.71 1.44
Diluted:        
Continuing operations attributable to common shareholders (in dollars per share) 1.02 0.75 1.68 1.43
Discontinued operations (in dollars per share) 0.00 (0.01) 0.00 (0.02)
Net income attributable to common shareholders (in dollars per share) $ 1.02 $ 0.74 $ 1.68 $ 1.41