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Common Stock Issuances (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Subsidiary or Equity Method Investee [Line Items]      
Number of common shares issued 0 496,335  
Number of common shares issued 10,856,356 10,843,676 10,853,566
Gross proceeds associated with sale $ 0 $ 4,741