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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 27, 2021
Feb. 23, 2021
Feb. 05, 2021
May 05, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Common Shares                
Authorized share capital         57,000,000.0      
Common shares, shares authorized         32,000,000 32,000,000    
Common shares, par value (in dollars per share)         $ 0.05 $ 0.05    
Preferred shares, shares authorized         25,000,000.0      
Preferred shares, par value (in dollars per share)         $ 0.001 $ 0.001    
Total aggregate amount of shares purchased         $ 13,859      
Stock issued (in shares)         8,383,000 8,324,000    
Proceeds from issuance of common shares, net of issuance costs             $ 301,404  
Treasury shares reissued during the year         0 0 0  
Preferred stock, rate (as a percent)         6.00% 6.00%    
Preferred stock, liquidation preference (in dollars per share)         $ 50 $ 50    
Aggregate net proceeds             $ 277,927  
Cash dividend per mandatory convertible preferred shares (in dollars per share)         $ 3.00 $ 3.00 $ 2.14  
Minimum percentage beneficial ownership to trigger rights exercise (as a percent)       4.90%        
Percentage discount that a rights holder is entitled to when purchasing additional shares (as a percent)       50.00%        
Exchange ratio after rights trigger       1        
Price per share at which the Rights may be redeemed       0.01        
Preferred Stock, Shares Outstanding         4,870,000 5,613,000    
Subsequent Event                
Common Shares                
Minimum percentage beneficial ownership to trigger rights exercise (as a percent) 10.00%   7.00%          
Common Stock                
Common Shares                
Stock issued (in shares)             800,000  
Share price of shares purchased (in dollars per share)             $ 387.50  
Proceeds from issuance of common shares, net of issuance costs             $ 301,400  
Treasury Shares                
Common Shares                
Shares repurchased         34,000      
Total aggregate amount of shares purchased         $ 1,731      
Mandatory Convertible Preferred Shares                
Common Shares                
Preferred shares, par value (in dollars per share)             $ 0.001  
Shares repurchased         900,000 136,772    
Total aggregate amount of shares purchased         $ 15,000 $ 2,900    
Amount of shares authorized to be repurchased               $ 15,000
Preferred stock, shares issued             5,750,000  
Preferred stock, rate (as a percent)             6.00%  
Preferred stock, liquidation preference (in dollars per share)             $ 50  
Mandatory Convertible Preferred Shares | Subsequent Event                
Common Shares                
Cash dividend per mandatory convertible preferred shares (in dollars per share)   $ 0.75            
Mandatory Convertible Preferred Shares | Common Stock                
Common Shares                
Number of consecutive trading days to calculate average share price of common stock             20 days  
Series B Preferred Stock                
Common Shares                
Preferred shares, par value (in dollars per share)       $ 0.001        
Exercise price (in dollars per share)       $ 58.08        
Number of right share for each outstanding common share       1        
Number of shares each right entitled to purchase       0.001        
Underwriters option | Mandatory Convertible Preferred Shares                
Common Shares                
Preferred stock, shares issued             750,000  
Underwriters option | Mandatory Convertible Preferred Shares | Common Stock                
Common Shares                
Aggregate net proceeds             $ 277,900  
Minimum                
Common Shares                
Additional ownership percentage acquired for right trigger       0.50%        
Minimum | Common Stock                
Common Shares                
Conversion ratio             0.1144  
Minimum | Mandatory Convertible Preferred Shares | Common Stock                
Common Shares                
Conversion ratio             0.1075  
Maximum | Subsequent Event                
Common Shares                
Minimum percentage beneficial ownership to trigger rights exercise (as a percent)     20.00%          
Maximum | Common Stock                
Common Shares                
Conversion ratio             0.1372  
Maximum | Mandatory Convertible Preferred Shares | Common Stock                
Common Shares                
Conversion ratio             0.1290  
Acquiring Company                
Common Shares                
Percentage discount that a rights holder is entitled to when purchasing additional shares (as a percent)       50.00%