Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity (Details)

v3.20.2
Stockholder's Equity (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Mar. 30, 2020
Oct. 30, 2018
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 30, 2020
Mar. 31, 2020
Mar. 21, 2020
Jun. 30, 2019
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  
7.375% Series A Cumulative Redeemable Preferred Stock                            
Class of Stock [Line Items]                            
Preferred stock interest rate         7.375%   7.375%              
Common Stock, par value $0.001 per share                            
Class of Stock [Line Items]                            
Authorized repurchase amount                   $ 5,000,000.0        
Common shares, outstanding (in shares) 13,651,521     12,808,341 13,651,521 13,534,856 13,638,916 13,651,521 13,651,521   12,826,031 11,960,225    
Reinvestment of dividends paid to common 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 | 7.375% 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 dividends paid to common 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%