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5.5% Series B Cumulative Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
day
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2018
shares
Class of Stock [Line Items]          
Series B Convertible Preferred Stock | $ $ 2,532 $ 1,708 $ 5,064 $ 3,415  
Series B Preferred Stock          
Class of Stock [Line Items]          
Preferred stock dividend rate     5.50%    
Initial conversion price (in dollars per share) $ 18.90   $ 18.90    
Preferred stock conversion rate     1.3228    
Consecutive trading days | day     45    
Days ending prior to notice of conversion     3 days    
Redemption price (in dollars per share) 25.00   $ 25.00    
Liquidation preference per share (in dollars per share) $ 25.00   $ 25.00    
Redemption percent of liquidation preference 103.00%   103.00%    
Series B preferred stock, shares outstanding (in shares) | shares 4,965,850   4,965,850   4,965,850
Annual preferred stock dividend (in dollars per share)     $ 1.375    
Series B Convertible Preferred Stock | $ $ 1,707 $ 1,708 $ 3,414 $ 3,415  
Series B Preferred Stock | Minimum          
Class of Stock [Line Items]          
Percent of conversion price 110.00%   110.00%