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Shareholders' Equity / Partners' Capital - Distributions (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Class of Stock [Line Items]
Common stock dividend declared (in dollars per share)	$ 0.05	$ 0.05
Class A common shares/units
Class of Stock [Line Items]
Common stock dividend declared (in dollars per share)	0.05	0.05
Class B common shares
Class of Stock [Line Items]
Common stock dividend declared (in dollars per share)	0.05
5.5% Series C Participating Preferred Shares
Class of Stock [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 0.34	$ 0.34
Preferred stock, dividend rate, percentage	5.50%	5.50%
Series D Perpetual Preferred Shares/Units
Class of Stock [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 0.41	$ 0.41
Preferred stock, dividend rate, percentage	6.50%
Series E Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 0.40	0.40
Preferred stock, dividend rate, percentage	6.35%
Series F Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 0.37
Preferred stock, dividend rate, percentage	5.875%
Series G Perpetual Preferred Shares
Class of Stock [Line Items]
Preferred stock dividends declared (in dollars per share)	$ 0.37
Preferred stock, dividend rate, percentage	5.875%
5.0% Series A Participating Preferred Shares
Class of Stock [Line Items]
Preferred stock dividends declared (in dollars per share)		$ 0.31
Preferred stock, dividend rate, percentage		5.00%
5.0% Series B Participating Preferred Shares
Class of Stock [Line Items]
Preferred stock dividends declared (in dollars per share)		$ 0.31
Preferred stock, dividend rate, percentage		5.00%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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