Special Charges/Recoveries (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Restructuring Reserve [Roll Forward]
Restructuring Reserve Beginning of Period	$ 2,118	$ 691	$ 1,618	$ 663
Restructuring Charges	341	2,252	5,366	6,674
Other Nonrecurring (Income) Expense	1,978	379	(5,809)	2,491
Special charges paid	(592)	(1,473)	(5,117)	(5,867)
Restructuring Reserve End of Period	1,867	1,470	1,867	1,470
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	192	379	619	(161)
Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	(51)	1,462	2,648	2,905
Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	1,786		1,923	2,652
Energy [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	138	1,093	3,107	1,340
Other Nonrecurring (Income) Expense	192	379	(11,581)	2,489
Energy [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		336		(153)
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down	192	379	619	(161)
Energy [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	(89)	757	886	1,493
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down		400		2,700
Energy [Member] | Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges				2,650
Aerospace [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		454		3,922
Aerospace [Member] | Employee Severance [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges		705		1,412
Aerospace [Member] | Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges				0
Corporate [Member]
Restructuring Reserve [Roll Forward]
Other Nonrecurring (Income) Expense	1,786	$ 0	2,024	2
Corporate [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Disposal Group, Not Discontinued Operation, Loss (Gain) on Write-down				0
Corporate [Member] | Acquisitions [Member]
Restructuring Reserve [Roll Forward]
Restructuring Charges	$ 1,786		$ 1,923	$ 2