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The Business - Principles of Consolidation (Details) - USD ($)		12 Months Ended
	May 18, 2017	Dec. 31, 2017	Dec. 31, 2016	Mar. 11, 2016
Subsidiary or Equity Method Investee [Line Items]
Equity Method Investment, Ownership Percentage				19.90%
Change in ownership in subsidiary		$ 0	$ 0
Hitachi America [Member]
Subsidiary or Equity Method Investee [Line Items]
Equity Method Investment, Ownership Percentage				21.00%
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | PCT Segment [Member]
Subsidiary or Equity Method Investee [Line Items]
Subsidiary, Ownership Interest by Parent	80.10%
Discontinued Operations, Held-for-sale or Disposed of by Sale [Member] | PCT Segment [Member] | PCT Allendale, LLC [Member] | Hitachi America [Member]
Subsidiary or Equity Method Investee [Line Items]
Purchase Agreement, Aggregate Purchase Price	$ 75,000,000

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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