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5.5% Series B Cumulative Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Apr. 05, 2017
USD ($)
shares
Mar. 07, 2017
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
day
$ / shares
shares
Jun. 30, 2017
USD ($)
Dec. 31, 2017
shares
Class of Stock [Line Items]              
Preferred dividends | $     $ 1,708 $ 1,707 $ 3,415 $ 3,380  
Series B Preferred Stock              
Class of Stock [Line Items]              
Preferred stock dividend rate   5.50%     5.50%    
Initial conversion price (in dollars per share) | $ / shares     $ 18.90   $ 18.90    
Preferred stock conversion rate         1.3228    
Consecutive trading days | day         45    
Days ending prior to notice of conversion         3 days    
Issuance of common stock (in shares) | shares   2,000,000          
Issuance of preferred stock (in dollars per share) | $ / shares   $ 20.19          
Proceeds from issuance of preferred stock | $   $ 39,900          
Proceeds from issuance of stock, net of discounts and expenses | $   $ 38,200          
Liquidation preference per share (in dollars per share) | $ / shares   $ 25.00          
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) | $ / shares         $ 1.375    
Series B Preferred Stock | Over-Allotment Option              
Class of Stock [Line Items]              
Issuance of common stock (in shares) | shares 100,000            
Proceeds from issuance of stock, net of discounts and expenses | $ $ 1,900            
Series B Preferred Stock | Minimum              
Class of Stock [Line Items]              
Percent of conversion price     110.00%   110.00%