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Restructuring and Asset Impairment - Rollforward of Severance and Retention Costs Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 24, 2016
Sep. 30, 2017
Sep. 24, 2016
Restructuring Reserve [Roll Forward]        
Beginning balance $ 4,004 $ 3,678 $ 3,680 $ 2,969
Expense 690 4,015 2,900 8,135
Payments / utilization (991) (2,323) (3,084) (5,676)
Foreign currency adjustments 103 2 310 (56)
Ending balance $ 3,806 $ 5,372 $ 3,806 $ 5,372