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Employee Benefit Plans Employe Benefit Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Settlement loss recognized $ (24,297) $ 0 $ 0
Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Employer contributions 9,546 0  
Assets used for settlements 67,728 0  
Settlement loss recognized $ (24,297) $ 0 $ 0