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Commitments and Contingencies (Changes in Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning asset retirement obligation $ 8,894 $ 8,925
Liabilities incurred during the period 4,331 509
Liabilities settled during the period (684) (534)
Accretion expense 401 308
Currency translation (264) (314)
Ending asset retirement obligations $ 12,678 $ 8,894