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Shareholders' Equity (Share Repurchase) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 28, 2017
Feb. 06, 2017
Jun. 28, 2017
Dec. 28, 2016
Equity, Class of Treasury Stock [Line Items]        
Purchase of treasury stock     $ 36,710  
Number of accumulated shares repurchased (in shares) 39,357   39,357 35,757
November 2016 Accelerated Share Repurchase [Member]        
Equity, Class of Treasury Stock [Line Items]        
Share repurchase, authorized amount (in dollars)       $ 25,000
Purchase of treasury stock (in shares) 500 2,000   1,500
Purchase of treasury stock $ 6,900     $ 18,100
Remaining shares to be repurchased (in dollars)       $ 6,900
Volume-weighted average price of treasury stock repurchased   $ 12.36    
Share Repurchase Program 2016 [Member]        
Equity, Class of Treasury Stock [Line Items]        
Share repurchase, authorized amount (in dollars) 100,000   $ 100,000  
Purchase of treasury stock (in shares)     3,000  
Purchase of treasury stock     $ 36,700  
Remaining shares to be repurchased (in dollars) $ 42,500   $ 42,500  
Number of accumulated shares repurchased (in shares) 4,700   4,700  
Value of shares repurchased $ 57,500   $ 57,500