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Subsequent Events - Declaration of Dividends (Details) - $ / shares |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 01, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Quarterly dividend (in USD per share) |  |  |  |  | $ 0.05 | $ 0.05 | $ 0.15 | $ 0.15
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% | 5.00%
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% | 5.00%
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% | 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% | 6.50% |  | 6.50% |
Series E Perpetual Preferred Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Quarterly preferred dividend (in USD per share) |  |  |  |  | $ 0.40569 |  |  |
Preferred stock, dividend rate, percentage |  | 6.35% | 6.35% |  | 6.35% |  | 6.35% |
Subsequent Event | Class A common shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Quarterly dividend (in USD per share) | $ 0.05 |  |  |  |  |  |  |
Subsequent Event | Class B common shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Quarterly dividend (in USD per share) | 0.05 |  |  |  |  |  |  |
Subsequent Event | 5.0% Series A Participating Preferred Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Quarterly preferred dividend (in USD per share) | $ 0.3125 |  |  |  |  |  |  |
Subsequent Event | 5.0% Series A Participating Preferred Shares | Dividend Declared |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |  |  |  |  |  |
Subsequent Event | 5.0% Series B Participating Preferred Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Quarterly preferred dividend (in USD per share) | $ 0.3125 |  |  |  |  |  |  |
Subsequent Event | 5.0% Series B Participating Preferred Shares | Dividend Declared |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.00% |  |  |  |  |  |  |
Subsequent Event | 5.5% Series C Participating Preferred Shares |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Quarterly preferred dividend (in USD per share) | $ 0.34375 |  |  |  |  |  |  |
Subsequent Event | 5.5% Series C Participating Preferred Shares | Dividend Declared |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 5.50% |  |  |  |  |  |  |
Subsequent Event | 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% |  |  |  |  |  |  |
Subsequent Event | 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% |  |  |  |  |  |  |

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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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