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Basis of Presentation (Narrative) (Details) - PST Eletronicaltda [Member] |  |  | 4 Months Ended | 60 Months Ended | 64 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 15, 2017 | Dec. 31, 2011 | Apr. 30, 2017 | Dec. 31, 2016 | May 15, 2017 | May 16, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Percentage ownership in consolidated subsidiary | 74.00% | 74.00% | 74.00% | 74.00% | 74.00% |
Percentage of additional noncontrolling interest acquired |  |  |  |  |  | 26.00%

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