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Partners' Capital, Mezzanine and Equity Distributions (Change in Class A Convertible Preferred Units) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2017 | Dec. 31, 2017
Carrying Amount |  |
Beginning Balance |  | $ 0
Ending Balance |  | $ 697,151
Units |  |
Beginning Balance (in shares) |  | 0
Issuance of Preferred Units (in shares) |  | 22,249,494
Distribution paid-in-kind (in shares) |  | 162,234
Ending Balance (in shares) |  | 22,411,728
Class A Convertible Preferred Stock Units [Member] |  |
Carrying Amount |  |
Beginning Balance |  | $ 0
Issuance of Preferred Units, net | $ 726,419 | 726,419
Allocation to Preferred Distribution Rate Reset Election |  | (34,450)
Distribution paid-in-kind |  | 5,469
Allocation of Distribution paid-kind to Preferred Distribution Rate Reset Election |  | (287)
Ending Balance | $ 726,419 | $ 697,151
Units |  |
Distribution paid-in-kind (in shares) |  | 162,234

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