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Segment Information (Textual) (Details) | 9 Months Ended
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Sep. 30, 2018 segment
Segment Reporting [Abstract] |
Number of reportable segments (business segments) | 4
Number of consolidated segments | 2
Number of segments accounted for as equity method investments | 3

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- Definition Number of Consolidated Segments + References No definition available. + Details
Name: | ande_NumberofConsolidatedSegments
Namespace Prefix: | ande_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of Segments Accounted for as Equity Method Investments + References No definition available. + Details
Name: | ande_NumberofSegmentsAccountedforasEquityMethodInvestments
Namespace Prefix: | ande_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration