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Shareholders' Equity / Partners' Capital - At the Market Common Share Offering Program (Details) - USD ($) $ / shares in Units, shares in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Aug. 31, 2017 | Nov. 30, 2016
Class of Stock [Line Items] |  |  |  |
Proceeds from issuance of shares/units | $ 0 | $ 355,589,000 |  |
Class A common shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Stock issuance costs | 0 | $ 350,000 |  |
At the Market - Common Share Offering Program | Class A common shares/units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Shares available for future issuance, value | $ 500,000,000 |  |  | $ 400,000,000
Shares issued during period (in shares) |  | 0.9 |  |
Proceeds from issuance of shares/units |  | $ 19,400,000 |  |
Shares issued, price per share (in dollars per share) |  | $ 22.75 |  |
Proceeds from issuance of common stock, net of issuance costs |  | $ 19,100,000 |  |
Stock issuance costs |  | $ 300,000 |  |
Shares authorized for future issuance, value |  |  | $ 500,000,000 |

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