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Shareholders' Equity / Partners' Capital - At the Market Common Share Offering Program (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of class A common shares |  |  | $ 0 | $ 0 | $ 694,765 |
Class A common shares/units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Common stock, shares issued (in shares) | 13,800,000 | 14,842,982 |  |  |  |
Proceeds from issuance of class A common shares | $ 312,000 | $ 336,500 |  |  |  |
Stock issuance costs | 9,200 | $ 400 | $ 0 | $ 0 | $ 10,637 |
At the Market - Common Share Offering Program | Class A common shares/units |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares reserved for future issuance |  |  |  |  |  | $ 400,000
Common stock, shares issued (in shares) |  |  | 0 |  | 2,000,000.0 |
Proceeds from issuance of class A common shares |  |  |  |  | $ 46,200 |
Sale of stock, price per share (in dollars per share) |  |  |  |  | $ 22.74 |
Proceeds from sale of stock, net of issuance costs |  |  |  |  | $ 45,600 |
Stock issuance costs |  |  |  |  | $ 600 |
Capital shares amount authorized for future issuance | $ 500,000 |  |  |  |  |
Remaining available for future shares |  |  | $ 500,000 |  |  |

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