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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
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 837 $ 3,379 $ 2,175 $ 9,700
Cost of sales - accelerated depreciation        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs 0 2,960 0 7,158
Restructuring and impairment charges        
Restructuring Cost and Reserve [Line Items]        
Restructuring costs $ 837 $ 419 $ 2,175 $ 2,542