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Shareholders' Equity / Partners' Capital - At the Market Common Share Offering Program (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2017 | Nov. 30, 2016
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Proceeds from issuance of Class A common shares |  |  |  | $ 694,765,000 | $ 102,830,000 | $ 0 |  |
Class A common shares/units |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Common stock, shares issued (in shares) | 13,800,000 | 14,842,982 | 36,546,170 |  |  |  |  |
Proceeds from issuance of Class A common shares | $ 312,000,000 | $ 336,500,000 |  |  |  |  |  |
Stock issuance costs | $ 9,200,000 | $ 400,000 |  | $ 10,637,000 | $ 227,000 | $ 0 |  |
At the Market - Common Share Offering Program | Class A common shares/units |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Shares reserved for future issuance |  |  |  |  |  |  |  | $ 400,000,000
Common stock, shares issued (in shares) |  |  |  | 2,000,000 | 4,900,000 |  |  |
Proceeds from issuance of Class A common shares |  |  |  | $ 46,200,000 | $ 104,000,000 |  |  |
Sale of stock, price per share (in dollars per share) |  |  |  | $ 22.74 | $ 21.13 |  |  |
Proceeds from sale of stock, net of issuance costs |  |  |  | $ 45,600,000 | $ 102,800,000 |  |  |
Stock issuance costs |  |  |  | 600,000 | $ 1,200,000 |  |  |
Capital shares amount authorized for future issuance |  |  |  |  |  |  | $ 500,000,000 |
Remaining available for future shares |  |  |  | $ 500,000,000 |  |  |  |

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