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Other Equity Matters (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]                
Treasury stock, value   $ 456,218       $ 456,218   $ 436,822
Preferred stock, redemption price per share (in dollars per share)   $ 25.00       $ 25.00    
Cash dividends paid per share   $ 0.57 $ 0.52     $ 1.71 $ 1.56  
Common Shares                
Class of Stock [Line Items]                
Aggregate Payment   $ 38,200 $ 35,500     $ 114,500 $ 108,400  
Preferred Shares                
Class of Stock [Line Items]                
Aggregate Payment   11,300 $ 10,500     32,300 $ 30,400  
Cumulative unpaid preferred dividends   $ 2,200       $ 2,200    
8.50% Series A Cumulative Redeemable Perpetual Preference Shares                
Class of Stock [Line Items]                
Per Share Payment (in dollars per share)   $ 0.53 $ 0.53     $ 1.59 $ 1.59  
Aggregate Payment   $ 1,800 $ 1,800     $ 5,400 $ 5,400  
8.00% Series B Cumulative Redeemable Perpetual Preference Shares                
Class of Stock [Line Items]                
Per Share Payment (in dollars per share)   $ 0.50 $ 0.50     $ 1.50 $ 1.50  
Aggregate Payment   $ 2,900 $ 2,900     $ 8,700 $ 8,700  
7.375% Series C Cumulative Redeemable Perpetual Preference Shares                
Class of Stock [Line Items]                
Per Share Payment (in dollars per share)   $ 0.46 $ 0.46     $ 1.38 $ 1.38  
Aggregate Payment   $ 3,200 $ 3,200     $ 9,600 $ 9,600  
6.875% Series D Cumulative Redeemable Perpetual Preference Shares                
Class of Stock [Line Items]                
Per Share Payment (in dollars per share)   $ 0.43 $ 0.43     $ 1.29 $ 1.10  
Aggregate Payment   $ 2,600 $ 2,600     $ 7,800 $ 6,700  
5.75% Series E Cumulative Redeemable Perpetual Preference Shares                
Class of Stock [Line Items]                
Proceeds from issuance of equity $ 169,500              
Underwriting discount $ 5,500              
Per Share Payment (in dollars per share)   $ 0.11 $ 0     $ 0.11 $ 0  
Aggregate Payment   $ 800 $ 0     $ 800 $ 0  
Treasury Shares                
Class of Stock [Line Items]                
Treasury shares acquired, shares   378,765 356,708 2,050,924 1,365,620      
Share price (in dollars per share)   $ 51.19       $ 51.19    
Treasury stock, value   $ 19,400       $ 19,400