Business Acquisitions - Net Assets Acquired (Details) - USD ($) $ in Thousands	Mar. 11, 2016	Oct. 28, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net
Goodwill			$ 61,744	$ 33,865	$ 32,047
Filter Sensing Technologies Inc.
Business Combinations - Schedule of Finite-Lived Intangible Assets [Abstract]
Business Acquisition, Goodwill, Expected Tax Deductible Amount		$ 0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net
Current assets		555
Property, plant and equipment		29
Goodwill		1,818
In-process research and development intangible asset		2,200
Other assets		8
Fair value of assets acquired		4,610
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		1,205
Less fair value of liabilities acquired		(1,855)
Less fair value of contingent consideration		$ (1,550)
CTG Advanced Materials, LLC [Member]
Business Combinations - Schedule of Finite-Lived Intangible Assets [Abstract]
Business Acquisition, Goodwill, Expected Tax Deductible Amount	$ 27,879
Business Combination, Recognized Identifiable Assets Acquired, Goodwill and Liabilities Assumed, Net
Current assets	4,215
Property, plant and equipment	6,173
Goodwill	27,879
Acquired Finite-lived Intangible Asset, Residual Value	35,427
Other assets	37
Fair value of assets acquired	73,731
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	(668)
Less fair value of liabilities acquired	(73,063)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 4