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Taxes (Narratives) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Income tax contingency      
Deferred tax assets, loss carryforwards $ 32,158 $ 31,582  
Deferred income tax expense (benefit) $ (9,436) $ 1,696 $ (49,380)
Effective tax rate (59.60%) 104.70% (4.40%)
Income tax effects allocated directly to equity $ 6,600    
Valuation allowance 118,089 $ 95,818  
Undistributed earnings of certain foreign subsidiaries 279,100    
Tax Cuts And Jobs Act Of 2017, existing undistributed accumulated earnings of foreign subsidiary 481,600    
Unrecognized tax benefits that would favorably impact the effective tax rate in future periods if recognized 35,700 33,500 $ 33,000
Unrecognized tax benefits excluding interest and penalties 11,400    
Accrued income tax-related interest 4,800 3,700  
Penalties accrued 1,000 1,000  
Accrued interest (benefit) expense 1,200 $ 800 $ 500
Foreign income tax      
Income tax contingency      
Deferred tax assets, loss carryforwards 27,800    
Increase (decrease) in deferred tax asset valuation allowance (6,200)    
State income tax      
Income tax contingency      
Deferred tax assets, loss carryforwards 4,300    
U.S. income tax      
Income tax contingency      
Increase (decrease) in deferred tax asset valuation allowance 28,500    
United States      
Income tax contingency      
Valuation allowance 85,000    
Foreign Plan      
Income tax contingency      
Valuation allowance $ 33,100