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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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