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Litigation And Contingent Liabilities (Details) | 0 Months Ended | 12 Months Ended
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Feb. 01, 2013 dealer | Dec. 31, 2014 dealer
Commitments and Contingencies Disclosure [Abstract] |  |
Number of dealers alleging damages | 6 us-gaap_LossContingencyNumberOfPlaintiffs | 5 us-gaap_LossContingencyNumberOfPlaintiffs
Loss Contingency, Claims Dismissed, Number |  | 1 us-gaap_LossContingencyClaimsDismissedNumber

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of claims dismissed. + References No definition available. + Details
Name: | us-gaap_LossContingencyClaimsDismissedNumber
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of plaintiffs that have filed claims pertaining to a loss contingency. + References No definition available. + Details
Name: | us-gaap_LossContingencyNumberOfPlaintiffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration