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Equity and Stock-Based Compensation (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 34 Months Ended
Sep. 28, 2020
May 22, 2020
May 15, 2020
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Dec. 31, 2019
Dec. 11, 2017
Dec. 05, 2017
Class of Stock [Line Items]                        
Common stock, par value (in dollars per share)         $ 0.01   $ 0.01   $ 0.01 $ 0.01    
Common Stock                        
Class of Stock [Line Items]                        
Shares of stock repurchased during period (in shares)         1,000   36,000 30,000        
Common Stock | Sale of Stock, Shares Authorized                        
Class of Stock [Line Items]                        
Stock sales authorized                     $ 50,000,000  
Common Stock | At-The-Market Equity Distribution                        
Class of Stock [Line Items]                        
At-the-market equity distribution program, shares sold (in shares)                 3,000,000.0      
At-the-market equity distribution program, amount                 $ 7,700,000      
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   225,000      
Fair value of units       $ 790,000                
Award vesting period       3 years                
Performance Shares | Minimum                        
Class of Stock [Line Items]                        
Award performance target             0.00%          
Performance Shares | Maximum                        
Class of Stock [Line Items]                        
Award performance target             200.00%          
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                
Non-Employee Restricted Stock | Director                        
Class of Stock [Line Items]                        
Number of units (in shares) 9,000                      
Fair value of units $ 23,000                      
Non-Employee Restricted Stock | May 2020 Grant 1 | Director                        
Class of Stock [Line Items]                        
Number of units (in shares)     17,000                  
Fair value of units     $ 37,000                  
Non-Employee Restricted Stock | May 2020 Grant 2 | Director                        
Class of Stock [Line Items]                        
Number of units (in shares)   18,000                    
Fair value of units   $ 48,000                    
Series D Preferred Stock                        
Class of Stock [Line Items]                        
Preferred stock dividend rate         8.25% 8.25% 8.25% 8.25%        
Annual preferred stock dividend (in dollars per share)             $ 2.0625