Restructuring and Other Charges (Changes in Restructuring Liability) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Sep. 30, 2017	Oct. 01, 2016
Restructuring Reserve [Roll Forward]
Restructuring and other charges	$ 10,025	$ 2,326	$ 20,040	$ 8,196
Restructuring Reserve	23,264		23,264
Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	1,514	1,983	2,202	2,949
Restructuring Reserve	1,690		1,690
Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	80	0	1,274	158
Restructuring Reserve	849		849
Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	165	203	5,697	769
Restructuring Reserve	20,725		20,725
Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring and other charges	281	$ 140	1,356	$ 1,598
Restructuring Reserve	0		0
2017 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			2,000
Restructuring and other charges			10,335
Payments for Restructuring			(4,863)
Restructuring Reserve	7,472		7,472
2017 Plan [Member] | Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			2,000
Restructuring and other charges			2,443
Payments for Restructuring			(2,753)
Restructuring Reserve	1,690		1,690
2017 Plan [Member] | Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			1,249
Payments for Restructuring			(400)
Restructuring Reserve	849		849
2017 Plan [Member] | Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			4,933
Payments for Restructuring			0
Restructuring Reserve	4,933		4,933
2017 Plan [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			1,710
Payments for Restructuring			(1,710)
Restructuring Reserve	0		0
2016 Plan [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			844
Restructuring and other charges			(45)
Payments for Restructuring			(799)
Restructuring Reserve	0		0
2016 Plan [Member] | Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			844
Restructuring and other charges			(45)
Payments for Restructuring			(799)
Restructuring Reserve	0		0
2016 Plan [Member] | Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			0
Payments for Restructuring			0
Restructuring Reserve	0		0
2016 Plan [Member] | Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			0
Payments for Restructuring			0
Restructuring Reserve	0		0
2016 Plan [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			0
Payments for Restructuring			0
Restructuring Reserve	0		0
Residual Plans [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			18,088
Restructuring and other charges			667
Payments for Restructuring			(2,963)
Restructuring Reserve	15,792		15,792
Residual Plans [Member] | Employee Severance Costs [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			247
Restructuring and other charges			(196)
Payments for Restructuring			(51)
Restructuring Reserve	0		0
Residual Plans [Member] | Lease Termination Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			0
Restructuring and other charges			25
Payments for Restructuring			(25)
Restructuring Reserve	0		0
Residual Plans [Member] | Multi-Employer Pension Withdrawal Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			17,482
Restructuring and other charges			764
Payments for Restructuring			(2,454)
Restructuring Reserve	15,792		15,792
Residual Plans [Member] | Building Clean-up, Equipment Moving and Other Expenses [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve			359
Restructuring and other charges			74
Payments for Restructuring			(433)
Restructuring Reserve	$ 0		$ 0