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Stockholders’ Equity - Narrative (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Nov. 13, 2018
USD ($)
$ / shares
shares
Aug. 14, 2018
USD ($)
$ / shares
shares
Oct. 15, 2017
Oct. 13, 2017
USD ($)
$ / shares
shares
Apr. 22, 2015
USD ($)
$ / shares
shares
Jun. 04, 2013
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
director
quarter
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Sep. 10, 2018
USD ($)
Aug. 10, 2017
USD ($)
$ / 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 12,000,000        
Preferred stock, shares outstanding (in shares) | shares             12,000,000 12,000,000        
Preferred stock issuance proceeds, net | $             $ 0 $ 130,496 $ 0      
Common stock dividend per share (in dollars per share)             $ 0.8 $ 0.8 $ 0.96      
Common stock, par value (in dollars per share)             $ 0.01 $ 0.01        
Underwritten Public Offering                        
Class of Stock [Line Items]                        
Stock issued (in shares) | shares 14,375,000 14,375,000                    
Share price (in dollars per share) $ 6.11 $ 6.16                    
Net proceeds | $ $ 85,300 $ 86,000                    
Equity Distribution Agreements                        
Class of Stock [Line Items]                        
Stock issued (in shares) | shares             14,588,631.00 55,886        
Share price (in dollars per share)             $ 6.19 $ 6.45        
Net proceeds | $             $ 89,000 $ 400        
Common stock, par value (in dollars per share)                     $ 0.01  
Common stock subscriptions (up to) | $                   $ 177,100 $ 100,000 $ 39,300
Common stock reserved for future issuance | $             $ 86,400          
Prior Equity Distribution Agreements                        
Class of Stock [Line Items]                        
Stock issued (in shares) | shares               87,737        
Share price (in dollars per share)               $ 6.68        
Net proceeds | $               $ 600        
Ordinary Income                        
Class of Stock [Line Items]                        
Common stock dividend per share (in dollars per share)             $ 0.37 $ 0.46 0.435112      
Capital Gain Distribution                        
Class of Stock [Line Items]                        
Common stock dividend per share (in dollars per share)             0.12          
Return of Capital                        
Class of Stock [Line Items]                        
Common stock dividend per share (in dollars per share)             $ 0.31 $ 0.17 $ 0.524624      
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 $ 25.00 $ 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              
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                
Series B , Series C and D 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%