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Share Capital - Additional Information (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
May 15, 2020
Dec. 31, 2019
Class of Stock [Line Items]          
Amounts pledged $ 336,488   $ 440,531    
Preferred stock, authorized 50,000,000        
Preferred stock, par value $ 0.001        
Preferred stock, issued 0        
Class A Stock          
Class of Stock [Line Items]          
Common stock, authorized 50,000,000   50,000,000    
Common stock, par value $ 0.001   $ 0.001    
Common Stock, outstanding 12,586,043 12,610,740 12,381,778 12,636,523 12,698,703
Common Stock, Shares, Issued 12,586,043   12,381,778    
Repurchase and cancelled stock 0 409,504      
Class B Stock          
Class of Stock [Line Items]          
Common stock, authorized 99,665   99,665    
Common stock, par value $ 0.001   $ 0.001    
Common Stock, outstanding 99,665   99,665    
Common Stock, Shares, Issued 99,665   99,665    
Previous Program [Member] | Class A Stock          
Class of Stock [Line Items]          
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased       98,625  
New Program [Member] | Class A Stock          
Class of Stock [Line Items]          
Repurchase of class A common stock       530,000  
Stock Repurchase Program Percentage Of Shares Repurchase Of Outstanding Share       4.20%  
Stock Repurchased and Retired During Period, Value $ 8,400        
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 401,013     628,625  
Stock Repurchased and Retired During Period, Shares 409,504        
Stock Repurchased and Retired During Period, Per Share $ 20.60        
Stock Repurchased and Retired During Period, Shares 409,504