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Taxes (Narratives) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Jan. 03, 2015
Income tax contingency      
Loss carryforwards $ 100,535    
Deferred income tax (benefit) expense $ (25,804) $ (2,425) $ 2,026
Tax at statutory rate 35.00% 35.00% 35.00%
Undistributed earnings of certain foreign subsidiaries $ 959,000    
Unrecognized tax benefits that would favorably impact the effective tax rate in future periods if recognized 20,600 $ 20,000 $ 12,800
Unrecognized tax benefits excluding interest and penalties 3,400    
Accrued income tax-related interest 2,300 2,200  
Penalties accrued 1,400 1,800  
Accrued interest (benefit) expense 100 300 700
Foreign income tax      
Income tax contingency      
Loss carryforwards 18,700    
Tax expense reduced from exercise of non-qualified stock options and stock appreciation rights and vesting of restricted stock and restricted stock units 200 300 400
U.S. income tax      
Income tax contingency      
Loss carryforwards 2,200    
Tax expense reduced from exercise of non-qualified stock options and stock appreciation rights and vesting of restricted stock and restricted stock units $ 3,300 $ 2,400 $ 4,700