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Shareholders' Equity - Distributions (Details) - $ / shares | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock dividend declared (in USD per share) |  |  |  | $ 0.05 | $ 0.05 | $ 0.15 | $ 0.15
Class A common shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock dividend declared (in USD per share) |  |  |  | 0.05 | 0.05 |  |
Class B common shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Common stock dividend declared (in USD per share) |  |  |  | $ 0.05 | 0.05 |  |
5.0% Series A Participating Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 5.00% |  | 5.00% | 5.00%
Preferred stock dividends declared (in USD per share) |  |  |  | $ 0.3125 | 0.3125 |  |
5.0% Series B Participating Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 5.00% |  | 5.00% | 5.00%
Preferred stock dividends declared (in USD per share) |  |  |  | $ 0.3125 | 0.3125 |  |
5.5% Series C Participating Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 5.50% |  | 5.50% | 5.50%
Preferred stock dividends declared (in USD per share) |  |  |  | $ 0.34375 | 0.34375 |  |
Series D Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 6.50% | 6.50% |  | 6.50% |
Preferred stock dividends declared (in USD per share) |  |  |  | $ 0.40625 |  |  |
Series E Perpetual Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 6.35% | 6.35% |  | 6.35% |  | 6.35% |
Preferred stock dividends declared (in USD per share) |  |  |  | $ 0.40569 |  |  |
Series D Convertible Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Declared distributions (in USD per share) |  |  |  | 0.035 |  | $ 0.035 |
Series C Convertible Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Declared distributions (in USD per share) |  |  |  | $ 0 | $ 0.15113 | $ 0 | $ 0.15113
Series D Convertible Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Percentage of participation eligibility on distributions |  |  |  |  |  | 70.00% |

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