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Stockholders' Equity - Distribution Reinvestment Plan (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Oct. 26, 2016
Feb. 09, 2015
Stockholders Equity Note [Line Items]      
Gross proceeds raised pursuant to DRP $ 3,164    
Distribution Reinvestment Plan      
Stockholders Equity Note [Line Items]      
Percent of estimated value per share 97.00%    
Period within which the company expects to establish an estimated value per share following the second anniversary 150 days    
Notice period served by board of directors to amend or terminate distribution reinvestment plan 10 days    
Gross proceeds raised pursuant to DRP $ 3,164    
Class A common | Distribution Reinvestment Plan      
Stockholders Equity Note [Line Items]      
Purchase price (in dollars per share) $ 9.81 $ 9.81 $ 9.81
Class T common | Distribution Reinvestment Plan      
Stockholders Equity Note [Line Items]      
Purchase price (in dollars per share) 9.27 9.27 $ 9.27
Class I Common | Distribution Reinvestment Plan      
Stockholders Equity Note [Line Items]      
Purchase price (in dollars per share) $ 9.10 $ 9.10