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Cover page Document Information (Details)	Nov. 04, 2019
Document Information [Line Items]
Document Type	8-K
Entity Central Index Key	0000874766
Amendment Flag	false
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Pre-commencement Issuer Tender Offer	false
Document Period End Date	Nov. 04, 2019

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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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The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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