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Subsequent Events - Declaration of Dividends (Details) - $ / shares |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 02, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly dividend (in dollars per share) |  | $ 0.05 |  | $ 0.05 | $ 0.15 | $ 0.15
Class A common shares/units |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly dividend (in dollars per share) |  | 0.05 |  | 0.05 |  |
Class B common shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly dividend (in dollars per share) |  | 0.05 |  | 0.05 |  |
5.5% Series C Participating Preferred Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) |  | $ 0.34 |  | $ 0.34 |  |
Preferred stock, dividend rate, percentage |  | 5.50% |  | 5.50% | 5.50% |
Series D Perpetual Preferred Shares/Units |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) |  | $ 0.41 |  | $ 0.41 |  |
Preferred stock, dividend rate, percentage |  | 6.50% |  |  |  |
Series E Perpetual Preferred Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) |  | $ 0.40 |  | $ 0.41 |  |
Preferred stock, dividend rate, percentage |  | 6.35% |  |  |  |
Series F Perpetual Preferred Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) |  | $ 0.37 |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 5.875% |  |  |
Series G, Preferred Perpetual Shares |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) |  | $ 0.30 |  |  |  |
Preferred stock, dividend rate, percentage |  | 5.875% |  |  |  |
Subsequent Event | Class A common shares/units | Dividend Declared |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly dividend (in dollars per share) | $ 0.05 |  |  |  |  |
Subsequent Event | 5.5% Series C Participating Preferred Shares | Dividend Declared |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) | $ 0.34375 |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.50% |  |  |  |  |
Subsequent Event | Series D Perpetual Preferred Shares/Units | Dividend Declared |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars 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 dollars per share) | $ 0.39688 |  |  |  |  |
Preferred stock, dividend rate, percentage | 6.35% |  |  |  |  |
Subsequent Event | Series F Perpetual Preferred Shares | Dividend Declared |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) | $ 0.36719 |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.875% |  |  |  |  |
Subsequent Event | Series G, Preferred Perpetual Shares | Dividend Declared |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Quarterly preferred dividend (in dollars per share) | $ 0.36719 |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.875% |  |  |  |  |

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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + 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 + Details
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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. + References No definition available. + Details
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