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Partners' Capital, Mezzanine and Equity Distributions (Initial Measurement of Class A Convertible Preferred Units) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Sep. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Temporary Equity [Line Items] |  |  |
Transaction price, net |  | $ 697,151 | $ 0
Class A Convertible Preferred Stock Units [Member] |  |  |
Temporary Equity [Line Items] |  |  |
Transaction price, gross | $ 750,000 |  |
Transaction cost to other third parties | (23,581) |  |
Transaction price, net | 726,419 | 726,419 |
Preferred Units, net | 691,969 |  |
Preferred Distribution Rate Reset Election (Note 18) | 34,450 |  |
Transaction price, net | $ 726,419 | $ 697,151 | $ 0

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