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Commitments and Contingencies (Changes in Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning asset retirement obligation $ 11,862 $ 13,086
Liabilities incurred during the period 563 166
Liabilities settled during the period (681) (1,150)
Accretion expense 366 366
Currency translation (17) (606)
Ending asset retirement obligations $ 12,093 $ 11,862