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Restructuring Costs Expensed (Details) - Realignment of Office Furniture Facilities and Exit of Business Line - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 3,379 $ 1,995 $ 9,700 $ 3,081
Cost of sales - accelerated depreciation        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 2,960 1,423 7,158 1,423
Restructuring charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 419 $ 572 $ 2,542 $ 1,658