Aggregate dividends declared during the period for each share of common stock outstanding.

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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- Definition

The percentage rate used to calculate dividend payments on preferred stock.

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- Definition

Aggregate dividends declared during the period for each share of preferred stock outstanding.

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- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Subsequent Events - Declaration of Dividends (Details) - $ / shares		3 Months Ended
	May 04, 2017	Mar. 31, 2017	Mar. 31, 2016
Subsequent Event [Line Items]
Quarterly dividend (in USD per share)		$ 0.05	$ 0.05
Class A common shares
Subsequent Event [Line Items]
Quarterly dividend (in USD per share)		0.05	0.05
Class B common shares
Subsequent Event [Line Items]
Quarterly dividend (in USD per share)		0.05	0.05
5.0% Series A Participating Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)		$ 0.3125	$ 0.3125
Preferred stock, dividend rate, percentage		5.00%	5.00%
5.0% Series B Participating Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)		$ 0.3125	$ 0.3125
Preferred stock, dividend rate, percentage		5.00%	5.00%
5.5% Series C Participating Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)		$ 0.34375	$ 0.34375
Preferred stock, dividend rate, percentage		5.50%	5.50%
Series D Perpetual Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)		$ 0.40625
Preferred stock, dividend rate, percentage		6.50%
Series E Perpetual Preferred Shares
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)		$ 0.39688
Preferred stock, dividend rate, percentage		6.35%
Subsequent Event \| Class A common shares \| Dividend Declared
Subsequent Event [Line Items]
Quarterly dividend (in USD per share)	$ 0.05
Subsequent Event \| Class B common shares \| Dividend Declared
Subsequent Event [Line Items]
Quarterly dividend (in USD per share)	0.05
Subsequent Event \| 5.0% Series A Participating Preferred Shares \| Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)	$ 0.3125
Preferred stock, dividend rate, percentage	5.00%
Subsequent Event \| 5.0% Series B Participating Preferred Shares \| Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)	$ 0.3125
Preferred stock, dividend rate, percentage	5.00%
Subsequent Event \| 5.5% Series C Participating Preferred Shares \| Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)	$ 0.34375
Preferred stock, dividend rate, percentage	5.50%
Subsequent Event \| Series D Perpetual Preferred Shares \| Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)	$ 0.40625
Preferred stock, dividend rate, percentage	6.50%
Subsequent Event \| Series E Perpetual Preferred Shares \| Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)	$ 0.39688
Preferred stock, dividend rate, percentage	6.35%
Subsequent Event \| Series F Redeemable Preferred Perpetual \| Dividend Declared
Subsequent Event [Line Items]
Quarterly preferred dividend (in USD per share)	$ 0.27335
Preferred stock, dividend rate, percentage	5.875%