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Taxes (Narratives) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 22, 2017
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Income tax contingency        
Loss carryforwards   $ 135,092    
Deferred income tax (benefit) expense   $ 1,696 $ (49,380) $ (25,804)
Tax at statutory rate   21.00% 35.00% 35.00%
Tax Cuts and Jobs Act of 2017, valuation allowance, recorded directly to equity $ 4,300      
Undistributed earnings of certain foreign subsidiaries   $ 465,300    
Tax Cuts And Jobs Act Of 2017, existing undistributed accumulated earnings of foreign subsidiary   408,200    
Unrecognized tax benefits that would favorably impact the effective tax rate in future periods if recognized   33,500 $ 33,000 $ 20,600
Unrecognized tax benefits excluding interest and penalties   17,900    
Accrued income tax-related interest   3,700 2,800  
Penalties accrued   1,000 1,300  
Accrued interest (benefit) expense   800 500 100
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   2,800 1,600 3,300
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred income tax asset valuation allowance increase 11,700      
Foreign income tax        
Income tax contingency        
Loss carryforwards   31,600    
Tax expense reduced from exercise of non-qualified stock options and stock appreciation rights and vesting of restricted stock and restricted stock units   $ 200 $ 100 $ 200
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred income tax asset valuation allowance increase $ 5,800