Reorganization and Realignment Costs G&A Realignment Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 29, 2020	Mar. 31, 2019
Restructuring Cost and Reserve
Reorganization and realignment costs	$ 3,910	$ 798
G&A Realignment
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	168	602
Restructuring and Related Cost, Cost Incurred to Date	29,132
Reorganization and realignment costs	267	782
Restructuring Charges, Incurred to Date	38,464
G&A Realignment | Severance and related employee costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	152	472
Restructuring and Related Cost, Cost Incurred to Date	24,390
G&A Realignment | Recruitment and relocation costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	15	114
Restructuring and Related Cost, Cost Incurred to Date	2,531
G&A Realignment | Third-party and other costs
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	1	16
Restructuring and Related Cost, Cost Incurred to Date	2,211
G&A Realignment | Share based compensation
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	99	180
Restructuring and Related Cost, Cost Incurred to Date	7,997
G&A Realignment | Termination of defined benefit plans
Restructuring Cost and Reserve
Restructuring and Related Cost, Incurred Cost	0	$ 0
Restructuring and Related Cost, Cost Incurred to Date	$ 1,335