Acquisitions Purchase Price Allocations (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Apr. 30, 2014	Dec. 31, 2013	Apr. 01, 2013
Acquisitions [Line Items]
Goodwill	$ 342,111	$ 340,743		$ 12,274
ATMI [Member]
Acquisitions [Line Items]
Accounts receivable and other current assets			$ 109,965
Inventory			114,200
Property, Plant, and Equipment			124,025
Identifiable intangible assets			297,040
Other Noncurrent Assets			8,503
Current liabilities			(60,943)
Deferred Tax Liabilities and other Noncurrent liabilities			(120,495)
Net assets acquired			472,295
Goodwill			337,095
Total purchase price, net of cash acquired			$ 809,390
Jetalon [Member]
Acquisitions [Line Items]
Accounts receivable, inventory and other assets					$ 944
Identifiable intangible assets					5,634
Current liabilities					(216)
Net assets acquired					6,362
Goodwill					10,090
Total purchase price, net of cash acquired					$ 16,452