Restructuring and Asset Impairment Charges - Restructuring Activities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
Restructuring Reserve [Roll Forward]
Charged to Expenses 2019	$ 672	$ 0	$ 672	$ 0
2018 Restructuring Plan
Restructuring Reserve [Roll Forward]
Balance at Beginning of Year			11,907
Deductions 2019			6,262
Charged to Expenses 2019			672
Balance at September 29, 2019	6,317		6,317
2018 Restructuring Plan | Workforce Reduction
Restructuring Reserve [Roll Forward]
Balance at Beginning of Year			10,763
Deductions 2019			5,892
Charged to Expenses 2019			0
Balance at September 29, 2019	4,871		4,871
2018 Restructuring Plan | Other Exit Costs
Restructuring Reserve [Roll Forward]
Balance at Beginning of Year			1,144
Deductions 2019			370
Charged to Expenses 2019			672
Balance at September 29, 2019	$ 1,446		$ 1,446