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5.5% Series A Cumulative Convertible Preferred Stock (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jun. 11, 2016
Apr. 26, 2016
USD ($)
$ / shares
shares
Dec. 04, 2015
$ / shares
Jun. 09, 2015
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
shares
Class of Stock [Line Items]                
Preferred stock, shares outstanding (in shares) | shares         4,943,000 4,375,000 8,955,000 8,776,000
Preferred stock conversion rate     1.3228          
Preferred dividends | $         $ 3,860 $ 1,986 $ 0  
Series A Preferred Stock [Member]                
Class of Stock [Line Items]                
Convertible preferred stock, shares issued (in shares) | shares       2,600,000        
Preferred stock dividend rate     5.50% 5.50%        
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        
Net proceeds from issuance of stock | $       $ 62,200        
Preferred stock, par value (in dollars per share)     $ 0.01          
Series B Preferred Stock [Member]                
Class of Stock [Line Items]                
Convertible preferred stock, shares issued (in shares) | shares         2,890,850 2,600,000    
Preferred stock dividend rate   5.50% 5.50%   5.50% 5.50%    
Liquidation preference (in dollars per share)   $ 25            
Issuance of preferred stock (in dollars per share)   $ 17.24            
Proceeds from issuance of preferred stock | $   $ 5,000            
Net proceeds from issuance of stock | $   $ 4,200            
Preferred stock, par value (in dollars per share)     $ 0.01          
Preferred stock, shares outstanding (in shares) | shares         2,890,850 2,600,000    
Average redemption price (in dollars per share)     $ 18.90          
Threshold Consecutive Trading Days 45 days              
Threshold trading days prior to notice of conversion 3 days              
Issuance of common stock (in shares) | shares   290,850            
Annual preferred stock dividend         $ 1.375      
Minimum [Member] | Series B Preferred Stock [Member]                
Class of Stock [Line Items]                
Percent of conversion price 110.00%