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Partners' Capital, Mezzanine Equity and Distributions (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Nov. 14, 2018 $ / shares shares | Sep. 01, 2017 USD ($) $ / shares shares | Jul. 31, 2018 USD ($) shares | May 01, 2018 USD ($) shares | Jan. 31, 2018 USD ($) shares | Sep. 30, 2018 USD ($) shares | Dec. 31, 2017 shares
Temporary Equity [Line Items] |  |  |  |  |  |  |
Number of convertible preferred units issued (in shares) |  |  |  |  |  | 23,914,890 | 22,411,728
Partners' capital, units outstanding (in shares) |  |  |  |  |  | 122,579,218 | 122,579,218
Common Class A | Partners’ Capital |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Partners' capital, units outstanding (in shares) |  |  |  |  |  | 122,539,221 |
Common Class B | Partners’ Capital |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Partners' capital, units outstanding (in shares) |  |  |  |  |  | 39,997 |
Class A Convertible Preferred Stock Units |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Distributions paid-in-kind | $ |  |  | $ 17,300 | $ 16,900 | $ 16,500 | $ 50,671 |
Distributions paid-in-kind, shares (in shares) |  |  | 511,934 | 500,976 | 490,252 | 1,503,162 |
Preferred units, cumulative cash distributions | $ |  |  |  |  |  | $ 51,800 |
Class A Convertible Preferred Stock Units | Subsequent Event | Quarterly Rate |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Stock dividend rate per unit (in dollars per share) | $ / shares | $ 0.7374 |  |  |  |  |  |
Class A Convertible Preferred Stock Units | Subsequent Event | In Arrears At Annual Rate |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Stock dividend rate per unit (in dollars per share) | $ / shares | $ 2.9496 |  |  |  |  |  |
Class A Convertible Preferred Stock Units | Subsequent Event | Scenario, Forecast |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Distributions paid-in-kind, shares (in shares) | 523,132 |  |  |  |  |  |
Private Placement | Class A Convertible Preferred Stock Units |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |
Temporary equity, stock issued during period (in shares) | $ |  | $ 750,000 |  |  |  |  |
Number of convertible preferred units issued (in shares) |  | 22,249,494 |  |  |  |  |
Cash purchase price per unit (in dollars per share) | $ / shares |  | $ 33.71 |  |  |  |  |
Number of initial purchasers |  | 2 |  |  |  |  |

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