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Shareholders' Equity (Preferred Shares Outstanding) (Details) - USD ($) $ in Thousands							9 Months Ended
	Aug. 17, 2021	Jul. 20, 2021	Jun. 30, 2021	Jun. 16, 2021	Aug. 14, 2020	Jun. 17, 2020	Sep. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Preferred stock, shares outstanding (in shares)							160,600	151,700
Liquidation Preference							$ 4,015,000	$ 3,792,500
Series C Preferred Stock
Class of Stock [Line Items]
Earliest Redemption Date							May 17, 2021
Dividend Rate			5.125%				5.125%
Preferred stock, shares outstanding (in shares)								8,000
Liquidation Preference								$ 200,000
Series D Preferred Stock
Class of Stock [Line Items]
Earliest Redemption Date							Jul. 20, 2021
Dividend Rate		4.95%					4.95%
Preferred stock, shares outstanding (in shares)								13,000
Liquidation Preference								$ 325,000
Series E Preferred Stock
Class of Stock [Line Items]
Earliest Redemption Date							Oct. 14, 2021
Dividend Rate							4.90%
Preferred stock, shares outstanding (in shares)							14,000	14,000
Liquidation Preference							$ 350,000	$ 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%	4.625%
Preferred stock, shares outstanding (in shares)							22,600	22,600
Liquidation Preference						$ 565,000	$ 565,000	$ 565,000
Series M Preferred Stock
Class of Stock [Line Items]
Earliest Redemption Date							Aug. 14, 2025
Dividend Rate					4.125%		4.125%
Preferred stock, shares outstanding (in shares)							9,200	9,200
Liquidation Preference					$ 230,000		$ 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%			4.00%
Preferred stock, shares outstanding (in shares)							24,150
Liquidation Preference				$ 603,800			$ 603,750
Series Q Preferred Stock
Class of Stock [Line Items]
Earliest Redemption Date							Aug. 17, 2026
Dividend Rate	3.95%						3.95%
Preferred stock, shares outstanding (in shares)							5,750
Liquidation Preference	$ 143,800						$ 143,750

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