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Summary of Significant Accounting Policies (Estimated Fair Value and Carrying Value of Notes) (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Estimated Fair Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Notes payable $ 15,973 $ 15,664
Carrying Value [Member]    
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]    
Notes payable $ 14,384 $ 13,635