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Equity - Earnings Per Share (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Numerator:        
Net income from continuing operations attributable to common shareholders $ 37,413 $ 31,984 $ 117,477 $ 100,394
Loss (income) from discontinued operations, net of income taxes (34) 52 (48) (862)
Net income attributable to common shareholders $ 37,379 $ 32,036 $ 117,429 $ 99,532
Denominator:        
Weighted-average shares outstanding—Basic (in shares) 46,290 46,016 46,572 46,683
Effect of dilutive securities:        
Stock options, restricted stock units, performance stock units and contingently issuable restricted stock (in shares) 955 862 1,012 883
Weighted-average shares outstanding—Diluted (in shares) 47,245 46,878 47,584 47,566