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Stockholders' Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Oct. 15, 2017
Oct. 13, 2017
USD ($)
$ / shares
shares
Apr. 22, 2015
USD ($)
$ / shares
shares
Jun. 04, 2013
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
director
quarter
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
Aug. 10, 2017
USD ($)
$ / shares
Mar. 20, 2015
USD ($)
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) | shares         200,000,000 200,000,000      
Preferred stock, par value (in dollars per share)         $ 0.01 $ 0.01      
Preferred stock, shares issued (in shares) | shares         12,000,000 6,600,000      
Preferred stock, shares outstanding (in shares) | shares         12,000,000 6,600,000      
Preferred stock issuance proceeds, net | $         $ 130,496 $ 0 $ 86,862    
Common stock dividend per share (in dollars per share)         $ 0.8 $ 0.96 $ 1.02    
Common stock, par value (in dollars per share)         0.01 0.01      
Ordinary Income                  
Class of Stock [Line Items]                  
Common stock dividend per share (in dollars per share)         0.46 0.435112 0.399764    
Capital Gain Distribution                  
Class of Stock [Line Items]                  
Common stock dividend per share (in dollars per share)         0.17   0.065284    
Return of Capital                  
Class of Stock [Line Items]                  
Common stock dividend per share (in dollars per share)         $ 0.17 $ 0.524624 $ 0.554952    
Equity Distribution Agreements                  
Class of Stock [Line Items]                  
Stock issued (in shares) | shares         55,886        
Common stock subscriptions (up to) | $               $ 100,000 $ 39,300
Common stock, par value (in dollars per share)               $ 0.01  
Share price (in dollars per share)         $ 6.45        
Net proceeds | $         $ 400        
Common stock reserved for future issuance | $         $ 99,600        
Prior Equity Distribution Agreements                  
Class of Stock [Line Items]                  
Stock issued (in shares) | shares         87,737 1,905,206      
Share price (in dollars per share)         $ 6.68 $ 6.87      
Net proceeds | $         $ 600 $ 12,800      
Series B and C Preferred Stock                  
Class of Stock [Line Items]                  
Minimum number of quarters without dividends that result in voting rights | quarter         6        
Number of additional directors elected | director         2        
Preferred stock, percentage of stockholders required for term changes         66.67%        
Series B Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) | shares         6,000,000 6,000,000      
Preferred stock, par value (in dollars per share)       $ 0.01 $ 0.01 $ 0.01      
Preferred stock, shares issued (in shares) | shares         3,000,000 3,000,000      
Preferred stock, shares outstanding (in shares) | shares         3,000,000 3,000,000      
Stock issued (in shares) | shares       3,000,000          
Preferred stock, Series B cumulative redeemable, dividend rate (as a percent)       7.75% 7.75% 7.75%      
Preferred stock, liquidation preference (in dollars per share)       $ 25 $ 25 $ 25      
Preferred stock issuance proceeds, net | $       $ 72,400          
Preferred stock, redemption price per share         $ 25.00        
Preferred stock, redemption term         120 days        
Series C Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) | shares         4,140,000 4,140,000      
Preferred stock, par value (in dollars per share)     $ 0.01   $ 0.01 $ 0.01      
Preferred stock, shares issued (in shares) | shares     3,600,000   3,600,000 3,600,000      
Preferred stock, shares outstanding (in shares) | shares         3,600,000 3,600,000      
Preferred stock, Series B cumulative redeemable, dividend rate (as a percent)     7.875%   7.875% 7.875%      
Preferred stock, liquidation preference (in dollars per share)     $ 25   $ 25 $ 25      
Preferred stock issuance proceeds, net | $     $ 86,900            
Preferred stock, redemption price per share         $ 25.00        
Preferred stock, redemption term         120 days        
Series D Preferred Stock                  
Class of Stock [Line Items]                  
Preferred stock, shares authorized (in shares) | shares   5,750,000     5,750,000        
Preferred stock, par value (in dollars per share)   $ 0.01     $ 0.01        
Preferred stock, shares issued (in shares) | shares   5,400,000     5,400,000        
Preferred stock, shares outstanding (in shares) | shares         5,400,000        
Preferred stock, Series B cumulative redeemable, dividend rate (as a percent) 5.695% 8.00%     8.00%        
Preferred stock, liquidation preference (in dollars per share)   $ 25     $ 25        
Preferred stock issuance proceeds, net | $   $ 130,500