XML 109 R94.htm IDEA: XBRL DOCUMENT v3.10.0.1
Commitments and Contingencies (Changes in Asset Retirement Obligations) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning asset retirement obligation $ 13,086 $ 12,678
Liabilities incurred during the period 166 549
Liabilities settled during the period (1,150) (1,472)
Accretion expense 366 363
Currency translation (606) 968
Ending asset retirement obligations $ 11,862 $ 13,086