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Share Capital, Preferred Stock (Details)
1 Months Ended 12 Months Ended 25 Months Ended
Feb. 28, 2018
$ / shares
shares
Apr. 30, 2017
USD ($)
$ / shares
shares
Jun. 30, 2014
USD ($)
$ / shares
shares
May 31, 2014
USD ($)
$ / shares
shares
Jun. 30, 2013
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2017
shares
Dec. 31, 2015
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Tender offer preferred stock redemption           $ 0 $ 0 $ 24,890,000    
Preferred deemed dividend           $ 199,000 $ 0 $ 2,146,000    
Series B Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Redemption price (in USD per share) | $ / shares $ 25.00                  
Preferred stock, multiplier to increase dividend rate payable         1.25          
Stock repurchased and retired (in shares) | shares                 114,232  
Preferred stock, shares outstanding (in shares) | shares           0 0      
Stock redeemed (in shares) | shares 379,514                  
Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Redemption price (in USD per share) | $ / shares           $ 25.00        
Stock repurchase program, authorized amount                   $ 20,000,000
Series C Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Future redeemable securities           $ 58,305,000        
Preferred stock, shares outstanding (in shares) | shares           2,300,000 2,300,000      
Series D Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Future redeemable securities           $ 81,120,000        
Preferred stock, shares outstanding (in shares) | shares           3,200,000 3,200,000      
June 2013 Public Offering                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Net proceeds from public offering and private placement         $ 38,865,000          
Underwriting discount         672,000          
Offering expenses         $ 463,000          
June 2013 Public Offering | Series B Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock issued (in shares) | shares         800,000          
Share price (in USD per share) | $ / shares         $ 25.00          
Preferred stock, dividend rate         8.00%          
Dividends in arrears (in USD per share) | $ / shares         $ 2.00          
Redemption date         Jun. 30, 2016          
Redemption price (in USD per share) | $ / shares         $ 25.00          
Private Placement | Series B Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock issued (in shares) | shares         800,000          
May 2014 Public Offering                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Net proceeds from public offering and private placement       $ 55,504,000            
Underwriting discount       1,744,000            
Offering expenses       $ 252,000            
May 2014 Public Offering | Series C Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock issued (in shares) | shares       2,300,000            
Share price (in USD per share) | $ / shares       $ 25.00            
Preferred stock, dividend rate       8.00%            
Dividends in arrears (in USD per share) | $ / shares       $ 2.00            
Redemption price (in USD per share) | $ / shares       $ 25.00            
June 2014 Public Offering                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Net proceeds from public offering and private placement     $ 77,420,000              
Underwriting discount     2,369,000              
Offering expenses     $ 211,000              
June 2014 Public Offering | Series D Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock issued (in shares) | shares     3,200,000              
Share price (in USD per share) | $ / shares     $ 25.00              
Preferred stock, dividend rate     8.00%              
Dividends in arrears (in USD per share) | $ / shares     $ 2.00              
Redemption price (in USD per share) | $ / shares     $ 25.00              
April 2017 tender offer                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Tender offer preferred stock redemption   $ 24,891,000                
Preferred deemed dividend   $ 2,146,000                
April 2017 tender offer | Series B Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Redemption price (in USD per share) | $ / shares   $ 22.50                
Stock repurchased and retired (in shares) | shares   1,106,254                
Percentage of tender acceptance   74.46%                
Preferred stock, shares outstanding (in shares) | shares   1,485,768                
April 2017 tender offer | Common Class A                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock issued (in shares) | shares   2,212,508                
Maximum | Series B Preferred Stock                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Preferred stock, dividend rate         25.00% 30.00%