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Shareholders' Equity / Partners' Capital - Share Repurchase Program (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Feb. 23, 2018 | Sep. 30, 2015
Class A common shares/units |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchase of Class A common stock, authorized amount |  |  |  |  | $ 300,000,000
Weighted-average price of shares (in dollars per share) |  | $ 15.44 |  |  |
Total cost of Class A common shares |  | $ 96,000,000 |  |  |
Remaining repurchase authorization amount | $ 146,700,000 |  |  |  |
Class A common shares/units | Subsequent Events |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchase of Class A common stock, authorized amount |  |  |  | $ 300,000,000 |
Class A common shares/units | Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchase and retire of Class A common shares (in shares) | 0 | 6,215,656 | 3,633,602 |  |
Preferred shares | Subsequent Events |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Repurchase of Class A common stock, authorized amount |  |  |  | $ 250,000,000 |

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