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Partners' Capital, Mezzanine and Equity Distributions (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Mar. 24, 2017 | Jul. 27, 2016 | Jul. 22, 2015 | Apr. 10, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Common units outstanding (in shares) |  |  |  |  | 122,579,218 | 117,979,218
Cash or stock available for distributions, percent usually distributed |  |  |  |  | 100.00% |
Days to distribute |  |  |  |  | 45 days |
Common units issued (in shares) |  |  |  |  | 122,579,218 | 117,979,218
Price per share of common units issued (in dollars per share) | $ 30.65 | $ 37.90 | $ 43.77 | $ 44.42 |  |
Net proceeds received from sale of units, net of underwriter discounts | $ 140,513 | $ 298,452 | $ 437,164 | $ 198,168 |  |
Class A [Member] |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Common units issued (in shares) | 4,600,000 | 8,000,000 | 10,350,000 | 4,600,000 |  |
Price per share of common units issued (in dollars per share) | $ 30.65 | $ 37.90 | $ 43.77 | $ 44.42 |  |
Additional common units to purchase (in shares) | 600,000 |  | 1,350,000 | 600,000 |  |
Net proceeds received from sale of units, net of underwriter discounts | $ 140,500 | $ 298,000 | $ 437,200 | $ 198,200 |  |
Class A [Member] | Partners' Capital |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Common units outstanding (in shares) |  |  |  |  | 122,539,221 |
Class B [Member] | Partners' Capital |  |  |  |  |  |
Partners Capital And Distributions [Line Items] |  |  |  |  |  |
Common units outstanding (in shares) |  |  |  |  | 39,997 |

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