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Shareholders' Equity (Share Repurchase) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2016
Dec. 30, 2015
Sep. 28, 2016
Equity, Class of Treasury Stock [Line Items]      
Purchase of treasury stock     $ 19,648
Number of accumulated shares repurchased (in shares) 33,043 29,659 33,043
Share Repurchase Program 2015 [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share repurchase, authorized amount (in dollars) $ 100,000   $ 100,000
Purchase of treasury stock (in shares)     1,900
Purchase of treasury stock     $ 19,600
Number of accumulated shares repurchased (in shares) 8,000   8,000
Value of shares repurchased $ 81,800   $ 81,800
Value of remaining shares to be repurchased (in dollars) 18,200   18,200
Share Repurchase Program 2016 [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share repurchase, authorized amount (in dollars) $ 100,000   $ 100,000
November 2015 Accelerated Share Repurchase [Member]      
Equity, Class of Treasury Stock [Line Items]      
Share repurchase, authorized amount (in dollars)   $ 50,000  
Purchase of treasury stock (in shares) 1,500 3,500 5,000
Purchase of treasury stock $ 13,100 $ 36,900  
Volume-weighted average price of treasury stock repurchased     $ 9.90