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Summary Of Significant Accounting Policies (Estimated Fair Value And Carrying Value Of Notes) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Estimated Fair Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Notes payable | $ 15,635 | $ 19,788
Carrying Value [Member] |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |
Notes payable | $ 13,363 | $ 16,106

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- Definition Fair value portion of notes payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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