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5.5% Series A Cumulative Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 05, 2017
USD ($)
shares
Mar. 07, 2017
USD ($)
$ / shares
shares
Mar. 01, 2017
USD ($)
Jun. 11, 2016
day
Apr. 26, 2016
USD ($)
$ / shares
shares
Dec. 04, 2015
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
shares
Class of Stock [Line Items]                    
Net proceeds from issuance of stock     $ 66,400              
Preferred stock, shares outstanding (in shares) | shares             4,790,000 4,943,000 4,375,000 8,955,000
Preferred stock conversion rate           1.3228        
Preferred dividends             $ 6,795 $ 3,860 $ 1,986  
Series B Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Preferred stock dividend rate   5.50%     5.50%   5.50% 5.50%    
Liquidation preference (in dollars per share) | $ / shares   $ 25     $ 25          
Issuance of preferred stock (in dollars per share) | $ / shares   $ 20.19     $ 17.24          
Proceeds from issuance of preferred stock   $ 39,900     $ 5,000          
Net proceeds from issuance of stock   $ 38,200     $ 4,200          
Preferred stock, shares outstanding (in shares) | shares             4,965,850 2,890,850    
Average redemption price (in dollars per share) | $ / shares           $ 18.90        
Threshold Consecutive Trading Days | day       45            
Threshold trading days prior to notice of conversion       3 days            
Issuance of common stock (in shares) | shares   2,000,000     290,850          
Annual preferred stock dividend (in dollars per share) | $ / shares             $ 1.375      
Minimum [Member] | Series B Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Percent of conversion price             110.00%      
Over-Allotment Option [Member] | Series B Preferred Stock [Member]                    
Class of Stock [Line Items]                    
Net proceeds from issuance of stock $ 1,900                  
Issuance of common stock (in shares) | shares 100,000