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Subsequent Events (Details) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 01, 2018 $ / shares | Oct. 31, 2018 USD ($) property | Sep. 30, 2018 $ / shares | Sep. 30, 2017 $ / shares | Sep. 30, 2018 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Nov. 02, 2018 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from the sale of real estate properties | $ |  |  |  |  | $ 47,757 | $ 68,618 |
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 |  |  |
Series D Perpetual Preferred Shares/Units |  |  |  |  |  |  |
Subsequent Event [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 |  |  |  |  |  |  |
Subsequent Event [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 |  |  |  |  |  |  |
Subsequent Event [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 |  |  |  |  |  |  |
Subsequent Event [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 |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  | 6.25% |  | 6.25% |  |
Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of properties acquired | property |  | 221 |  |  |  |  |
Purchase price to acquire real estate | $ |  | $ 55,100 |  |  |  |  |
Number of internally developed properties developed | property |  | 12 |  |  |  |  |
Number of real estate properties sold | property |  | 138 |  |  |  |  |
Proceeds from the sale of real estate properties | $ |  | $ 21,200 |  |  |  |  |
Subsequent Event | Hurricane Michael | Minimum |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Estimate of possible loss | $ |  |  |  |  |  |  | $ 400
Subsequent Event | Hurricane Michael | Maximum |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Estimate of possible loss | $ |  |  |  |  |  |  | $ 700
Subsequent Event | Class A common shares/units |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Quarterly dividend (in dollars per share) | $ 0.05 |  |  |  |  |  |
Subsequent Event | Class B common shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Quarterly dividend (in dollars per share) | 0.05 |  |  |  |  |  |
Subsequent Event | Series D Perpetual Preferred Shares/Units |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared (in dollars per share) | 0.40625 |  |  |  |  |  |
Subsequent Event | Series E Perpetual Preferred Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared (in dollars per share) | 0.39688 |  |  |  |  |  |
Subsequent Event | Series F Perpetual Preferred Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared (in dollars per share) | 0.36719 |  |  |  |  |  |
Subsequent Event | Series G Perpetual Preferred Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared (in dollars per share) | 0.36719 |  |  |  |  |  |
Subsequent Event | Series H Perpetual Preferred Shares |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Preferred stock dividends declared (in dollars per share) | 0.44271 |  |  |  |  |  |
Preferred stock, dividend rate, prorated amount, percentage | $ 0.05 |  |  |  |  |  |

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