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5.5% Series B Cumulative Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 07, 2017
Mar. 31, 2019
USD ($)
day
$ / shares
shares
Mar. 31, 2018
USD ($)
Dec. 31, 2018
shares
Class of Stock [Line Items]        
Series B Convertible Preferred Stock | $   $ 2,532 $ 1,707  
Series B Preferred Stock        
Class of Stock [Line Items]        
Preferred stock dividend rate 5.50% 5.50%    
Initial conversion price (in dollars per share)   $ 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    
Liquidation preference per share (in dollars per share)   $ 25.00    
Redemption percent of liquidation preference   103.00%    
Series B preferred stock, shares outstanding (in shares) | shares   4,965,850   4,965,850
Annual preferred stock dividend (in dollars per share)   $ 1.375    
Series B Convertible Preferred Stock | $   $ 1,707    
Series B Preferred Stock | Minimum        
Class of Stock [Line Items]        
Percent of conversion price   110.00%