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Taxes (Narratives) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 22, 2017
Dec. 30, 2017
Dec. 31, 2016
Jan. 02, 2016
Income tax contingency        
Loss carryforwards   $ 120,967    
Deferred income tax (benefit) expense   $ (49,380) $ (25,804) $ (2,425)
Tax at statutory rate   35.00% 35.00% 35.00%
Tax Cuts and Jobs Act of 2017, transition tax $ 86,400      
Tax Cuts and Jobs Act of 2017, transition tax liability 15,700      
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax liability, benefit 52,800      
Tax Cuts and Jobs Act of 2017, tax expense 33,600      
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax asset, income tax expense 28,200      
Undistributed earnings of certain foreign subsidiaries   $ 650,300    
Tax Cuts And Jobs Act Of 2017, existing undistributed accumulated earnings of foreign subsidiary   378,000    
Unrecognized tax benefits that would favorably impact the effective tax rate in future periods if recognized   33,000 $ 20,600 $ 20,000
Unrecognized tax benefits excluding interest and penalties   5,400    
Accrued income tax-related interest   2,800 2,300  
Penalties accrued   1,300 1,400  
Accrued interest (benefit) expense   500 100 300
U.S. income tax        
Income tax contingency        
Tax expense reduced from exercise of non-qualified stock options and stock appreciation rights and vesting of restricted stock and restricted stock units   1,600 3,300 2,400
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred income tax asset valuation allowance increase 44,700      
Foreign income tax        
Income tax contingency        
Loss carryforwards   27,900    
Tax expense reduced from exercise of non-qualified stock options and stock appreciation rights and vesting of restricted stock and restricted stock units   $ 100 $ 200 $ 300
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred income tax asset valuation allowance increase $ 11,800