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Business Acquisitions - Celsis Pro Forma Results (Details) - Celsis - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Business Acquisition [Line Items]        
Revenue $ 350,819 $ 335,987 $ 1,026,643 $ 993,384
Net income attributable to common shareholders $ 40,826 $ 31,893 $ 125,863 $ 84,545
Earnings per common share        
Basic (in dollars per share) $ 0.88 $ 0.69 $ 2.70 $ 1.81
Diluted (in dollars per share) $ 0.86 $ 0.68 $ 2.65 $ 1.78