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Stockholders' Equity - Distribution Reinvestment Plan (Details) - USD ($)
$ / shares in Units, shares in Millions
6 Months Ended 12 Months Ended 93 Months Ended
Feb. 02, 2015
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2015
Nov. 30, 2015
Class of Stock [Line Items]                
Share price (in dollars per share)           $ 9.10    
Number of shares issued (in shares) 108.6              
Common Stock                
Class of Stock [Line Items]                
Number of shares issued (in shares)       173.4        
Value of common stock issued       $ 1,700,000,000        
Dividend Reinvestment Plan                
Class of Stock [Line Items]                
Share price (in dollars per share)             $ 8.63  
Share repurchase price (in dollars per share)         $ 8.50      
Selling commissions or dealer manager fees paid   $ 0            
Notice period served by board of directors to amend or terminate DRP (in days)   10 days            
Dividend Reinvestment Plan | Common Stock                
Class of Stock [Line Items]                
Number of shares issued (in shares)   2.2 7.4 23.3        
Value of common stock issued   $ 18,700,000 $ 67,200,000 $ 212,700,000        
Initial Distribution Support Agreement | Dividend Reinvestment Plan                
Class of Stock [Line Items]                
Share price (in dollars per share)               $ 9.50
Follow-on Distribution Reinvestment Plan                
Class of Stock [Line Items]                
Share price (in dollars per share)               $ 10.20
Percentage of offering price               95.00%
Follow-on Distribution Reinvestment Plan | Dividend Reinvestment Plan                
Class of Stock [Line Items]                
Share price (in dollars per share)               $ 9.69