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Stockholders' Equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 21, 2015
Sep. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]              
Common stock, shares authorized         450,000,000 450,000,000  
Common stock, par value (in dollars per share)         $ 0.01 $ 0.01  
Preferred stock, shares authorized         50,000,000    
Preferred stock, par value (in dollars per share)         $ 0.01    
Common stock shares issued         67,195,252 46,900,442  
Common stock, shares outstanding         67,195,252 46,900,442  
Proceeds from issuance of common stock, net of offering costs     $ 193,148 $ 158,439      
Payments of stock offering costs         $ 987 $ 389 $ 824
Repurchase of common stock         $ 1,741 $ 0 $ 0
Series A Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock dividend percentage         8.625%    
Preferred stock shares issued         3,450,000 3,450,000  
Preferred stock, shares outstanding         3,450,000 3,450,000  
Series B Preferred Stock [Member]              
Class of Stock [Line Items]              
Preferred stock dividend percentage         8.00%    
Preferred stock shares issued         8,000,000    
Preferred stock, shares outstanding         8,000,000    
Series B Preferred Stock [Member] | Private Placement [Member]              
Class of Stock [Line Items]              
Issuance of stock (shares) 8,000,000            
Price per share of issued stock (in USD per share) $ 24.71            
Proceeds from private placement issuance $ 346,855            
Payments of stock offering costs $ 500            
Common Stock [Member]              
Class of Stock [Line Items]              
Repurchases of common stock (shares)   107,432     107,432    
Stock repurchases during period, price per share (in USD per share)   $ 16.20          
Repurchase of common stock   $ 1,741          
Common Stock [Member] | Follow-on public offering [Member]              
Class of Stock [Line Items]              
Issuance of stock (shares)     11,500,000 9,706,000      
Price per share of issued stock (in USD per share)     $ 16.82 $ 16.35      
Common Stock [Member] | Private Placement [Member]              
Class of Stock [Line Items]              
Issuance of stock (shares) 8,823,529            
Price per share of issued stock (in USD per share) $ 17.00