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Shareholders' Equity (Preferred Shares Outstanding) (Details) - USD ($) $ in Thousands		9 Months Ended
	Jan. 13, 2022	Sep. 30, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)		174,000	164,000
Liquidation Preference		$ 4,350,000	$ 4,100,000
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%	4.10%
Preferred stock, shares outstanding (in shares)		10,000	0
Liquidation Preference	$ 250,000	$ 250,000	$ 0

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Value of the difference between preference in liquidation and the par or stated values of the preferred shares.

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