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Shareholders' Equity / Partners' Capital - Redemption of Series A and B Participating Preferred Shares (Details) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 05, 2018 market shares | Oct. 03, 2017 market shares | Jun. 30, 2014 | Dec. 31, 2013 | Mar. 31, 2014 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) | Sep. 30, 2017 $ / shares | Mar. 31, 2017 $ / shares | Mar. 31, 2016 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption of participating preferred shares | $ |  |  |  |  |  | $ 32,215 | $ 42,416 | $ 0 |  |  |
Preferred shares, shares outstanding (in shares) |  |  |  |  |  | 35,350,000 | 38,350,000 |  |  |  |
Preferred shares, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 | $ 0.01 |  |  |  |
Conversion ratio |  | 1.3106 |  |  |  |  |  |  |  |  |
Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of preferred units (in shares) | 7,600,000 |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  |  | 5.50% |  |  | 5.50% | 5.50% | 5.50% |  |  |
Preferred shares, shares outstanding (in shares) |  |  |  |  |  | 0 | 7,600,000 |  |  |  |
Class A common shares/units |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common shares, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01
Redemption of Series A and B participating preferred shares (in shares) | 10,848,827 |  |  |  |  |  |  |  |  |  |
Stock exchange ratio | 1.4275 |  |  |  |  |  |  |  |  |  |
Percent of cumulative change in value of an index | 50.00% | 50.00% |  |  |  | 50.00% |  |  |  |  |
Number of markets used in calculation | market | 20 | 20 |  |  |  |  |  |  |  |  |
Maximum internal rate of return | 9.00% |  |  |  |  |  |  |  |  |  |
Redemption of participating preferred shares | $ |  |  |  |  |  | $ 32,200 |  |  |  |  |
Preferred stock redemption premium | $ |  |  |  |  |  | $ 42,400 |  |  |  |  |
Series A Participating Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  | 5.00% |  | 5.00% |  |  | 5.00% | 5.00% |  |  |
Redemption of Series A and B participating preferred shares (in shares) |  | 12,398,276 |  |  |  |  |  |  |  |  |
Preferred shares, shares outstanding (in shares) |  | 5,060,000 |  |  |  |  |  |  |  |  |
Preferred shares, par value (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.01 |  |  |  |  |
Series B Participating Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cumulative annual cash dividend rate |  | 5.00% |  |  | 5.00% | 5.00% | 5.00% | 5.00% |  |  |
Preferred shares, shares outstanding (in shares) |  | 4,400,000 |  |  |  |  |  |  |  |  |

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