Restructuring (Changes in Restructuring Accruals) (Details) - Realignment of Office Furniture Facilities and Exit of Business Line $ in Thousands	3 Months Ended
	Apr. 01, 2017 USD ($)
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	$ 2,704
Restructuring charges, excluding amounts in cost of goods sold	2,123
Cash payments	(1,193)
Balance as of April 1, 2017	3,634
Severance
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	2,704
Restructuring charges, excluding amounts in cost of goods sold	986
Cash payments	(701)
Balance as of April 1, 2017	2,989
Facility Exit Costs & Other
Restructuring Reserve [Roll Forward]
Balance as of December 31, 2016	0
Restructuring charges, excluding amounts in cost of goods sold	1,137
Cash payments	(492)
Balance as of April 1, 2017	$ 645