Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 29, 2017	Sep. 30, 2016	Sep. 29, 2017	Sep. 30, 2016
Net sales		$ 844,509	$ 766,521	$ 2,426,101	$ 2,373,345
Income from continuing operations before income taxes		63,438	51,819	176,005	152,434
Interest expense		11,328	6,892	29,106	24,988
Restructuring and other related charges		7,298	11,752	23,131	37,998
Segment Operating Income (Loss)	[1]	82,064	70,463	228,242	215,420
Air and Gas Handling
Net sales		362,310	320,436	989,044	1,009,598
Segment Operating Income (Loss)	[1]	40,234	32,331	97,570	102,577
Fabrication Technology
Net sales		482,199	446,085	1,437,057	1,363,747
Segment Operating Income (Loss)	[1]	56,232	48,074	172,696	148,430
Corporate and other
Segment Operating Income (Loss)	[1]	$ (14,402)	$ (9,942)	$ (42,024)	$ (35,587)

[1] The following is a reconciliation of Income from continuing operations before income taxes to segment operating income: