Business Acquisitions Schedule of Finite-Lived Intangible Assets (Tables) - CTG Advanced Materials, LLC [Member] $ in Thousands	Mar. 11, 2016 USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 35,427
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years 9 months 20 days
Developed Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 23,730
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Customer Relationships and Contracts
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 11,502
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	14 years 7 months 6 days
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Fair Value	$ 195
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	9 months 18 days