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Share Capital, Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended 36 Months Ended
Feb. 28, 2018
Apr. 30, 2017
Dec. 31, 2016
Jun. 30, 2014
May 31, 2014
Jun. 30, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2018
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Tender offer preferred stock redemption             $ 0 $ 24,890 $ 0    
Preferred deemed dividend             $ 0 $ 2,146 $ 0    
Series B Preferred Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Redemption price (in USD per share) $ 25.00                    
Stock repurchased and retired (in shares)                   114,232  
Preferred stock, shares outstanding (in shares)             0 379,514   0  
Stock redeemed (in shares) 379,514                    
Preferred Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Redemption price (in USD per share)             $ 25     $ 25  
Stock repurchase program, authorized amount                     $ 20,000
Series C Preferred Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Future redeemable securities             $ 58,305     $ 58,305  
Preferred stock, shares outstanding (in shares)             2,300,000 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     $ 81,120  
Preferred stock, shares outstanding (in shares)             3,200,000 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          
Underwriting discount           672          
Offering expenses           $ 463          
June 2013 Public Offering | Series B Preferred Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued (in shares)           800,000          
Share price (in USD per share)           $ 25          
Preferred stock, dividend rate           8.00%          
Dividends in arrears (in USD per share)           $ 2          
Redemption date           Jun. 30, 2016          
Redemption price (in USD per share)           $ 25          
Private Placement | Series B Preferred Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued (in shares)           800,000          
Private Placement | Common Class A                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued (in shares)     2,727,272                
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            
Underwriting discount         1,744            
Offering expenses         $ 252            
May 2014 Public Offering | Series C Preferred Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued (in shares)         2,300,000            
Share price (in USD per share)         $ 25            
Preferred stock, dividend rate         8.00%            
Dividends in arrears (in USD per share)         $ 2            
Redemption price (in USD per share)         $ 25            
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              
Underwriting discount       2,369              
Offering expenses       $ 211              
June 2014 Public Offering | Series D Preferred Stock                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued (in shares)       3,200,000              
Share price (in USD per share)       $ 25              
Preferred stock, dividend rate       8.00%              
Dividends in arrears (in USD per share)       $ 2              
Redemption price (in USD per share)       $ 25              
April 2017 tender offer                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Tender offer preferred stock redemption   $ 24,891                  
Preferred deemed dividend   $ 2,146                  
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)   $ 22.50                  
Stock repurchased and retired (in shares)   1,106,254                  
Percentage of tender acceptance   74.46%                  
Preferred stock, shares outstanding (in 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)   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%