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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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- Definition

Additional percentage of noncontrolling interest acquired

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X

- Definition

Percentage of subsidiary's or equity investee's stock owned by parent company after stock transaction.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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