Common and Preferred Shares Preferred Shares (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Series C Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Shares Issued	5,392,916	5,394,050
Preferred share dividend percentage	5.75%
Preferred share dividend rate (in dollars per share)	$ 1.4375
Per share liquidation preference	25
Preferred shares conversion rate	0.4148
Preferred shares conversion price	60.27
Common shares quarterly dividend per share threshold, minimum	$ 0.6875
Common share closing price percent of preferred share prevailing conversion price, minimum	135.00%
Preferred Shares declared dividends per share	$ 1.4375	$ 1.4375
Preferred Stock, Dividends, Per Share, Cash Paid	1.4375	1.4375	$ 1.4375
Preferred Shares, Convertible, Conversion Adjustment	$ 0.0522	$ 0.2131
Series E Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Shares Issued	3,447,381	3,447,381
Preferred share dividend percentage	9.00%
Preferred share dividend rate (in dollars per share)	$ 2.25
Per share liquidation preference	25
Preferred shares conversion rate	0.4826
Preferred shares conversion price	51.80
Common shares quarterly dividend per share threshold, minimum	$ 0.84
Common share closing price percent of preferred share prevailing conversion price, minimum	150.00%
Preferred Shares declared dividends per share	$ 2.25	$ 2.25
Preferred Stock, Dividends, Per Share, Cash Paid	$ 2.25	2.25	2.25
Preferred Shares, Convertible, Conversion Adjustment		$ 0.1695
Series G Preferred Stock [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Shares Issued	6,000,000	6,000,000
Preferred share dividend percentage	5.75%
Preferred share dividend rate (in dollars per share)	$ 1.4375	$ 1.4375
Per share liquidation preference	25.00
Preferred Stock, Dividends, Per Share, Cash Paid	1.4375	1.4375	$ 1.4375
Taxable Ordinary Income [Member] | Series C Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	0.0522	0.0958
Preferred Stock, Dividends, Per Share, Cash Paid	1.4375	0.9631
Taxable Ordinary Income [Member] | Series E Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	0	0.0176
Preferred Stock, Dividends, Per Share, Cash Paid	2.2500	1.5075
Taxable Ordinary Income [Member] | Series G Preferred Stock [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid	1.4375	0.9631
Return of Capital [Member] | Series C Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	0	0.0701
Preferred Stock, Dividends, Per Share, Cash Paid	0	0
Return of Capital [Member] | Series E Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	0	0.1432
Preferred Stock, Dividends, Per Share, Cash Paid	0	0
Return of Capital [Member] | Series G Preferred Stock [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid	0	0
Long-term Capital Gain [Member] | Series C Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	0	0.0472
Unrecaptured Section 1250 gain	0	0.1559
Dividends, Per Share, Non-cash Distributions, Unrecaptured Section 1250 Gain	0	0.0155
Preferred Stock, Dividends, Per Share, Cash Paid	0	0.4744
Long-term Capital Gain [Member] | Series E Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	0	0.0087
Unrecaptured Section 1250 gain	0	0.2441
Dividends, Per Share, Non-cash Distributions, Unrecaptured Section 1250 Gain	0	0.0610
Preferred Stock, Dividends, Per Share, Cash Paid	0	0.7425
Long-term Capital Gain [Member] | Series G Preferred Stock [Member]
Schedule of Preferred Stock [Line Items]
Dividends, Per Share, Non-cash Distributions, Unrecaptured Section 1250 Gain	0	0.1559
Preferred Stock, Dividends, Per Share, Cash Paid	0	0.4744
Total Cash Distribution Per Share [Member] | Series C Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid	1.4375	1.4375
Total Cash Distribution Per Share [Member] | Series E Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid	2.2500	2.2500
Total Cash Distribution Per Share [Member] | Series G Preferred Stock [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Cash Paid	1.4375	1.4375
Total non-cash Distributions Per Share [Domain] | Series C Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	0.0522	0.2131
Total non-cash Distributions Per Share [Domain] | Series E Preferred Shares [Member]
Schedule of Preferred Stock [Line Items]
Preferred Stock, Dividends, Per Share, Non-cash Distributions	$ 0	$ 0.1695