Quarterly report pursuant to Section 13 or 15(d)

Stockholder's Equity (Details)

v3.20.2
Stockholder's Equity (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
Mar. 30, 2020
Oct. 30, 2018
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Mar. 31, 2020
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  
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 12,826,031 13,638,916 13,651,521   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%