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Basis of Presentation (Details)	6 Months Ended
	Jun. 30, 2018
Basis of Presentation
Quarter fiscal period duration (in days)	91 days

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- Definition

Duration of a fiscal period, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Includes, but not limited to, weeks in a year or quarter.

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No definition available.

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Period Type:	duration