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Stockholders' Equity - Distribution Reinvestment Plan (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 75 Months Ended
Apr. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2016
Dec. 07, 2016
Jun. 30, 2016
Nov. 30, 2015
Class of Stock [Line Items]                
Share price (in dollars per share)             $ 9.10  
Value of common stock issued   $ 296 $ 697,491 $ 766,729        
Common Stock                
Class of Stock [Line Items]                
Number of shares issued (in shares)   100,000 76,800,000   173,400,000      
Value of common stock issued   $ 800 $ 777,900   $ 1,700,000      
Dividend Reinvestment Plan                
Class of Stock [Line Items]                
Shares available (in shares)     30,000,000.0          
Share price (in dollars per share)     $ 8.63          
Notice period served by board of directors to amend or terminate DRP 10 days 10 days            
Share repurchase price (in dollars per share)           $ 9.10    
Dividend Reinvestment Plan | Common Stock                
Class of Stock [Line Items]                
Number of shares issued (in shares)   7,600,000 4,800,000   13,700,000      
Value of common stock issued   $ 67,800 $ 46,400   $ 126,800      
Dividend Reinvestment Plan | Initial Distribution Support Agreement                
Class of Stock [Line Items]                
Share price (in dollars per share)               $ 9.50
Dividend Reinvestment Plan | Follow-on Distribution Reinvestment Plan                
Class of Stock [Line Items]                
Share price (in dollars per share)               $ 9.69