Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity (Details)

v3.20.1
Stockholder's Equity (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2020
Mar. 30, 2020
Oct. 30, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Mar. 21, 2020
Dec. 31, 2018
Nov. 09, 2018
Jun. 29, 2015
Class of Stock [Line Items]                    
Repurchase of preferred stock       $ 161,997 $ 60,550          
Common shares, issued (in shares) 13,651,521     13,651,521   13,638,916        
Common shares, outstanding (in shares 13,651,521     13,651,521   13,638,916        
Aggregate offering price                 $ 600,000,000.0  
Series A Cumulative Redeemable Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock interest rate       7.375%   7.375%        
Common Stock                    
Class of Stock [Line Items]                    
Authorized repurchase amount             $ 5,000,000.0      
Common shares, outstanding (in shares 13,651,521     13,651,521 12,808,341 13,638,916   11,960,225    
Reinvestment of distributions to stockholders (in shares)         11,076          
Depositary Shares                    
Class of Stock [Line Items]                    
Depository shares outstanding (in shares) 5,010,814     5,010,814            
Shares repurchased (in shares)   8,913                
Repurchase of preferred stock   $ 162,000                
Preferred Stock                    
Class of Stock [Line Items]                    
Depository shares outstanding (in shares) 50,108     50,108            
Preferred Stock | Series A Cumulative Redeemable Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock interest rate       7.375%            
Dividend Reinvestment Plan                    
Class of Stock [Line Items]                    
Reinvestment of distributions to stockholders (in shares) 22,003   1,000,000              
Remaining availability (in shares) 977,997     977,997            
7.00% Convertible Senior Notes | Convertible Debt                    
Class of Stock [Line Items]                    
Interest rate 7.00%     7.00%   7.00%       7.00%