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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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