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Stockholders' Equity (Share Redemption Program) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Nov. 13, 2016
Sep. 30, 2016
Sep. 30, 2015
Aug. 31, 2015
Feb. 18, 2014
Equity, Class of Treasury Stock [Line Items]                  
NAV per share (USD per share) $ 10.08 $ 10.08              
Redemptions of common stock   $ 110,655 $ 44,188 $ 10,849          
Unfulfilled redemption requests (shares) 2,300,000                
Distribution reinvestment plan                  
Equity, Class of Treasury Stock [Line Items]                  
NAV per share (USD per share) $ 10.08 $ 10.08       $ 9.92 $ 9.70    
Share price (USD per share) $ 9.50 $ 9.50     $ 9.70   $ 9.50   $ 9.50
The Share Redemption Program                  
Equity, Class of Treasury Stock [Line Items]                  
Stock repurchase program, required holding period   1 year              
Stock redemption program, plan redemption price per share, percentage of amount paid per share, after two year (percent)   97.50%              
Stock redemption program, plan redemption price per share, percentage of amount paid per share, after three year (percent)   100.00%              
NAV per share (USD per share)     $ 9.70     $ 9.92   $ 10.00  
Stock repurchase program, termination notice period   30 days              
Stock repurchased and retired during period, shares   11,500,000 4,600,000 1,100,000          
Redemptions of common stock   $ 110,700 $ 44,200 $ 10,600          
Unfulfilled redemption requests (shares)   3,600,000              
The Share Redemption Program | Maximum                  
Equity, Class of Treasury Stock [Line Items]                  
Stock redemption program, number of shares authorized to be repurchased, percentage of weighted average number of shares outstanding (percent)   5.00%              
Stock repurchase program, number of shares authorized to be repurchased per quarter, prior year percentage of weighted average number of shares outstanding (percent)   1.25%              
Stock redemption program, redemption priority, shares   250              
The Share Redemption Program | Distribution reinvestment plan                  
Equity, Class of Treasury Stock [Line Items]                  
DRIP portion of the Offering as a percentage of most recent estimated value of each share (percent)   100.00%