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Shareholders' Equity (Schedule of Preferred Shares) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Class of Stock [Line Items]    
Preferred stock, shares outstanding (in shares) 174,000 174,000
Liquidation Preference $ 4,350,000 $ 4,350,000
Series F Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Jun. 02, 2022  
Dividend Rate 5.15%  
Preferred stock, shares outstanding (in shares) 11,200 11,200
Liquidation Preference $ 280,000 $ 280,000
Series G Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Aug. 09, 2022  
Dividend Rate 5.05%  
Preferred stock, shares outstanding (in shares) 12,000 12,000
Liquidation Preference $ 300,000 $ 300,000
Series H Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Mar. 11, 2024  
Dividend Rate 5.60%  
Preferred stock, shares outstanding (in shares) 11,400 11,400
Liquidation Preference $ 285,000 $ 285,000
Series I Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Sep. 12, 2024  
Dividend Rate 4.875%  
Preferred stock, shares outstanding (in shares) 12,650 12,650
Liquidation Preference $ 316,250 $ 316,250
Series J Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Nov. 15, 2024  
Dividend Rate 4.70%  
Preferred stock, shares outstanding (in shares) 10,350 10,350
Liquidation Preference $ 258,750 $ 258,750
Series K Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Dec. 20, 2024  
Dividend Rate 4.75%  
Preferred stock, shares outstanding (in shares) 9,200 9,200
Liquidation Preference $ 230,000 $ 230,000
Series L Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Jun. 17, 2025  
Dividend Rate 4.625%  
Preferred stock, shares outstanding (in shares) 22,600 22,600
Liquidation Preference $ 565,000 $ 565,000
Series M Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Aug. 14, 2025  
Dividend Rate 4.125%  
Preferred stock, shares outstanding (in shares) 9,200 9,200
Liquidation Preference $ 230,000 $ 230,000
Series N Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Oct. 06, 2025  
Dividend Rate 3.875%  
Preferred stock, shares outstanding (in shares) 11,300 11,300
Liquidation Preference $ 282,500 $ 282,500
Series O Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Nov. 17, 2025  
Dividend Rate 3.90%  
Preferred stock, shares outstanding (in shares) 6,800 6,800
Liquidation Preference $ 170,000 $ 170,000
Series P Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Jun. 16, 2026  
Dividend Rate 4.00%  
Preferred stock, shares outstanding (in shares) 24,150 24,150
Liquidation Preference $ 603,750 $ 603,750
Series Q Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Aug. 17, 2026  
Dividend Rate 3.95%  
Preferred stock, shares outstanding (in shares) 5,750 5,750
Liquidation Preference $ 143,750 $ 143,750
Series R Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Nov. 19, 2026  
Dividend Rate 4.00%  
Preferred stock, shares outstanding (in shares) 17,400 17,400
Liquidation Preference $ 435,000 $ 435,000
Series S Preferred Stock    
Class of Stock [Line Items]    
Earliest Redemption Date Jan. 13, 2027  
Dividend Rate 4.10%  
Preferred stock, shares outstanding (in shares) 10,000 10,000
Liquidation Preference $ 250,000 $ 250,000