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Equity and Stock-Based Compensation (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
May 22, 2020
May 31, 2020
Mar. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Dec. 11, 2017
Dec. 05, 2017
Class of Stock [Line Items]                    
Common stock dividends declared         $ 5,336,000   $ 10,665,000      
Common stock, par value (in dollars per share)       $ 0.01   $ 0.01   $ 0.01    
At-the-market equity distribution program, shares sold (in shares)       0   0        
Stock Repurchase Program                    
Class of Stock [Line Items]                    
Common stock, par value (in dollars per share)                   $ 0.01
Share repurchase program authorized amount       $ 50,000,000   $ 50,000,000     $ 50,000,000 $ 50,000,000
Shares of stock repurchased during period (in shares)       0 0 0 0      
Performance Shares                    
Class of Stock [Line Items]                    
Award service period           3 years        
Number of units (in shares)       225,000   225,000        
Fair value of units     $ 790,000              
Award vesting period     3 years              
Restricted Stock                    
Class of Stock [Line Items]                    
Fair value of units     $ 1,400,000              
Award vesting period     3 years              
Shares granted (in shares)     311,000              
Minimum | Performance Shares                    
Class of Stock [Line Items]                    
Award performance target           0.00%        
Maximum | Performance Shares                    
Class of Stock [Line Items]                    
Award performance target           200.00%        
Common Stock                    
Class of Stock [Line Items]                    
Common stock dividends declared       $ 0 $ 5,336,000 $ 0 $ 10,665,000      
Series D Preferred Stock                    
Class of Stock [Line Items]                    
Preferred stock dividend rate           8.25%        
Annual preferred stock dividend (in dollars per share)           $ 2.0625        
Dividends declared – preferred stock       $ 825,000 $ 825,000 $ 1,650,000 $ 1,650,000      
May 2020 Grant 1 | Non-Employee Restricted Stock | Director                    
Class of Stock [Line Items]                    
Number of units (in shares)   17,000                
Fair value of units   $ 37,000                
May 2020 Grant 2 | Non-Employee Restricted Stock | Director                    
Class of Stock [Line Items]                    
Number of units (in shares) 18,000                  
Fair value of units $ 48,000