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Partners' Capital and Distributions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | Mar. 24, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Partners Capital And Distributions [Line Items] |  |  |
Limited Partners' Capital Account, Units Outstanding |  | 122,579,218 | 117,979,218
Common units, issued |  | 122,579,218 | 117,979,218
Limited Partner | Common Class A [Member] |  |  |
Partners Capital And Distributions [Line Items] |  |  |
Limited Partners' Capital Account, Units Outstanding |  | 122,539,221 |
Limited Partner | Class B [Member] |  |  |
Partners Capital And Distributions [Line Items] |  |  |
Limited Partners' Capital Account, Units Outstanding |  | 39,997 |
Common Class A [Member] |  |  |
Partners Capital And Distributions [Line Items] |  |  |
Common units, issued | 4,600,000 |  |
Common units issued to underwriters | 600,000 |  |
Public sale of units net of offering costs | $ 140.5 |  |
Sale of Stock, Price Per Share | $ 30.65 |  |

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