Reorganization and Realignment Costs G&A Realignment Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 2,911	$ 3,570	$ 6,821	$ 4,368
G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	(6)	2,683	162	3,285
Restructuring and Related Cost, Cost Incurred to Date	29,126		29,126
Reorganization and realignment costs	64	3,517	331	4,299
Restructuring Charges, Incurred to Date	38,528		38,528
G&A Realignment | Severance and related employee costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	(6)	2,130	146	2,602
Restructuring and Related Cost, Cost Incurred to Date	24,384		24,384
G&A Realignment | Recruitment and relocation costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	0	482	15	596
Restructuring and Related Cost, Cost Incurred to Date	2,531		2,531
G&A Realignment | Third-party and other costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	0	71	1	87
Restructuring and Related Cost, Cost Incurred to Date	2,211		2,211
G&A Realignment | Share based compensation
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	70	834	169	1,014
Restructuring and Related Cost, Cost Incurred to Date	8,067		8,067
G&A Realignment | Termination of defined benefit plans
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	0	$ 0	0	$ 0
Restructuring and Related Cost, Cost Incurred to Date	$ 1,335		$ 1,335