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Shareholders' Equity / Partners' Capital - Distributions (Details) - $ / shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Class of Stock [Line Items] |  |  |  |
Common stock dividend declared (in dollars per share) | $ 0.05 | $ 0.05 | $ 0.15 | $ 0.15
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 | 0.05 |  |
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% | 6.50% | 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% | 6.35% | 6.35% |
Series F Perpetual Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.37 | $ 0.37 |  |
Preferred stock, dividend rate, percentage | 5.875% | 5.875% | 5.875% |
Series G Perpetual Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) | $ 0.37 | $ 0.30 |  |
Preferred stock, dividend rate, percentage | 5.875% |  | 5.875% |
Series H Perpetual Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock, dividend rate, percentage | 6.25% |  | 6.25% |
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% |  |
5.5% Series C Participating Preferred Shares |  |  |  |
Class of Stock [Line Items] |  |  |  |
Preferred stock dividends declared (in dollars per share) |  | $ 0.34 |  |
Preferred stock, dividend rate, percentage |  | 5.50% | 5.50% |

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