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Shareholders' Equity / Partners' Capital - Participating Preferred Shares (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Apr. 05, 2018 market shares | Sep. 30, 2018 USD ($) $ / shares shares | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) market $ / shares shares | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred shares, shares outstanding (in shares) | shares |  | 35,350,000 |  |  | 35,350,000 |  | 38,350,000
Liquidation Value |  | $ 883,750 |  |  | $ 883,750 |  | $ 986,986
Liquidation value (in dollars per share) | $ / shares |  | $ 25.00 |  |  | $ 25.00 |  |
Number of top markets used for purchase price index | market |  |  |  |  | 20 |  |
Redemption of participating preferred shares/units |  | $ 0 |  | $ 0 | $ 32,215 | $ 0 |
5.5% Series C Participating Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  |  |  | 5.50% | 5.50% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 0 |  |  | 0 |  | 7,600,000
Liquidation Value |  | $ 0 |  |  | $ 0 |  | $ 218,236
Stock converted during period (in shares) | shares | 7,600,000 |  |  |  |  |  |
Series D Perpetual Preferred Shares/Units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 6.50% |  | 6.50% | 6.50% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 10,750,000 |  |  | 10,750,000 |  | 10,750,000
Liquidation Value |  | $ 268,750 |  |  | $ 268,750 |  | $ 268,750
Series E Perpetual Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 6.35% |  | 6.35% | 6.35% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 9,200,000 |  |  | 9,200,000 |  | 9,200,000
Liquidation Value |  | $ 230,000 |  |  | $ 230,000 |  | $ 230,000
Series F Perpetual Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 5.875% |  | 5.875% | 5.875% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 6,200,000 |  |  | 6,200,000 |  | 6,200,000
Liquidation Value |  | $ 155,000 |  |  | $ 155,000 |  | $ 155,000
Series G Perpetual Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 5.875% |  |  | 5.875% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 4,600,000 |  |  | 4,600,000 |  | 4,600,000
Liquidation Value |  | $ 115,000 |  |  | $ 115,000 |  | $ 115,000
Series H Perpetual Preferred Shares |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage |  | 6.25% |  |  | 6.25% |  |
Preferred shares, shares outstanding (in shares) | shares |  | 4,600,000 |  |  | 4,600,000 |  | 0
Liquidation Value |  | $ 115,000 |  |  | $ 115,000 |  | $ 0
Liquidation value (in dollars per share) | $ / shares |  | $ 25.00 |  |  | $ 25.00 |  |
Shares issued during period (in shares) | shares |  | 4,600,000 |  |  |  |  |
Gross proceeds on issuance of preferred shares |  | $ 115,000 |  |  |  |  |
Stock issuance costs |  | $ 4,000 |  |  |  |  |
Class A common shares/units |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Percent of liquidation preference | 50.00% |  |  |  |  |  |
Issuance of common shares, net of offering costs (in shares) | shares | 10,848,827 |  |  |  |  |  |
Stock exchange ratio | 1.4275 |  |  |  |  |  |
Stock issuance costs |  |  |  |  | $ 0 | $ 10,444 |
Common shares, par value (in dollars per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01
Number of markets used in calculation of conversion ratio | market | 20 |  |  |  |  |  |
Conversion ratio, maximum internal rate of return | 9.00% |  |  |  |  |  |
Redemption of participating preferred shares/units |  |  | $ 32,200 |  |  |  |

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