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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. 26, 2016
USD ($)
$ / shares
shares
Dec. 04, 2015
$ / shares
Jun. 09, 2015
USD ($)
$ / shares
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2016
USD ($)
$ / shares
shares
Jun. 30, 2015
USD ($)
Dec. 31, 2015
shares
Class of Stock [Line Items]                
Preferred stock conversion rate   1.3228            
Preferred dividends | $       $ 978 $ 198 $ 1,872 $ 198  
Series A Preferred Stock [Member]                
Class of Stock [Line Items]                
Series B preferred stock, shares issued (in shares) | shares     2,600,000          
Preferred stock dividend rate   5.50% 5.50%          
Preferred stock, par value (in dollars per share)   $ 0.01            
Issuance of preferred stock (in dollars per share)     $ 25.00          
Underwriting discount | $     $ 1,500          
Issuance of preferred stock, net of discount (in dollars per share)     $ 24.4125          
Proceeds from issuance of stock, net of discounts and Expenses | $     $ 62,200          
Series B Preferred Stock [Member]                
Class of Stock [Line Items]                
Series B preferred stock, shares issued (in shares) | shares       2,890,850   2,890,850   2,600,000
Preferred stock dividend rate 5.50% 5.50%            
Liquidation preference per share $ 25.00              
Preferred stock, par value (in dollars per share)   $ 0.01            
Issuance of preferred stock (in dollars per share) $ 17.24              
Proceeds from issuance of preferred stock | $ $ 5,000              
Proceeds from issuance of stock, net of discounts and Expenses | $ $ 4,200              
Series B preferred stock, shares outstanding (in shares) | shares       2,900,000   2,900,000   2,600,000
Initial conversion price (in dollars per share)   $ 18.90            
Consecutive trading days           45 days    
Days ending prior to notice of conversion           3 days    
Stock issued (in shares) | shares 290,850              
Annual preferred stock dividend           $ 1.375    
Minimum | Series B Preferred Stock [Member]                
Class of Stock [Line Items]                
Percent of conversion price       110.00%   110.00%