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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

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