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Equity - Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Numerator:        
Net income from continuing operations attributable to common shareholders $ 48,516 $ 35,908 $ 80,064 $ 68,410
Loss from discontinued operations, net of income taxes (7) (644) (14) (914)
Net income attributable to common shareholders $ 48,509 $ 35,264 $ 80,050 $ 67,496
Denominator:        
Weighted-average shares outstanding—Basic (in shares) 46,675 46,942 46,712 47,016
Effect of dilutive securities:        
Stock options, restricted stock units, performance stock units and contingently issuable restricted stock (in shares) 875 742 1,006 893
Weighted-average shares outstanding—Diluted (in shares) 47,550 47,684 47,718 47,909