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Partners' Capital, Mezzanine Equity and Distributions (Additional Information Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 24, 2017 | Jul. 27, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Partners Capital And Distributions [Line Items] |  |  |  |
Common units outstanding (in units) |  |  | 122,579,218 | 122,579,218
Cash or stock available for distributions, percent usually distributed |  |  | 100.00% |
Days to distribute |  |  | 45 days |
Common units issued (in units) |  |  | 122,579,218 | 122,579,218
Price per share of common units issued (in dollars per unit) | $ 30.65 | $ 37.90 |  |
Net proceeds received from sale of units, net of underwriter discounts | $ 140,513 | $ 298,452 |  |
Class A |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Common units issued (in units) | 4,600,000 | 8,000,000 |  |
Price per share of common units issued (in dollars per unit) | $ 30.65 | $ 37.90 |  |
Additional common units to purchase (in units) | 600,000 |  |  |
Net proceeds received from sale of units, net of underwriter discounts | $ 140,500 | $ 298,500 |  |
Class A | Partners' Capital |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Common units outstanding (in units) |  |  | 122,539,221 |
Class B | Partners' Capital |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |
Common units outstanding (in units) |  |  | 39,997 |

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