Information on Business Segments (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 1,436,499	$ 1,230,754	$ 1,193,975
Long-lived assets	$ 1,584,800	$ 1,503,600	$ 1,449,100
Sales from international locations to domestic locations	78.00%	82.00%	82.00%
Domestic [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 638,600	$ 562,600	$ 589,600
Long-lived assets	366,700	368,200	379,200
International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	868,300	727,400	661,700
Long-lived assets	1,218,100	1,135,500	1,069,900
Other [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	(70,400)	(59,200)	(57,300)
Long-lived assets	0	0	0
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	237,600	238,300	246,400
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	301,700	238,300	210,500
Long-lived assets	514,000	449,900	362,700
Switzerland [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	160,000	169,300	167,000
Engineered Components Products [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	347,900	332,600	342,200
Molding Solutions Products [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	487,300	376,600	324,600
Nitrogen Gas Products [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	138,700	115,000	115,500
Aerospace Original Equipment Manufacturing Products [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	323,400	288,400	295,700
Aerospace Aftermarket Products and Services [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 139,200	$ 118,200	$ 116,000