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Partners' Capital, Mezzanine Capital and Distributions (Narrative) (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 15, 2019 shares | Feb. 14, 2019 shares | Nov. 14, 2018 shares | Aug. 14, 2018 shares | May 15, 2018 shares | Sep. 01, 2017 USD ($) buyer $ / shares shares | Sep. 30, 2019 USD ($) shares | Mar. 31, 2019 $ / shares shares | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 shares
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common units outstanding (in units) |  |  |  |  |  |  | 122,579,218 |  |  | 122,579,218 |  | 122,579,218
Preferred units, accumulated distributions | $ |  |  |  |  |  |  | $ 18,684 |  | $ 17,635 | $ 55,783 | $ 51,780 |
Common Class A | Partners’ Capital |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common units outstanding (in units) |  |  |  |  |  |  | 122,539,221 |  |  | 122,539,221 |  |
Common Class B | Partners’ Capital |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common units outstanding (in units) |  |  |  |  |  |  | 39,997 |  |  | 39,997 |  |
Class A Convertible Preferred Stock Units |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of convertible preferred units issued (in units) |  |  |  |  |  |  | 25,336,778 |  |  | 25,336,778 |  | 24,438,022
Preferred units, accumulated distributions | $ |  |  |  |  |  |  | $ 18,700 |  |  | $ 55,800 |  |
Distributions paid-in-kind (in units) | 364,180 | 534,576 | 523,132 | 511,934 | 500,976 |  |  | 364,180 |  | 898,756 |  |
Stock dividend rate per unit (in dollars per unit) | $ / shares |  |  |  |  |  |  |  | $ 0.2458 |  |  |  |
Class A Convertible Preferred Stock Units | Quarterly Rate |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock dividend rate per unit (in dollars per unit) | $ / shares |  |  |  |  |  |  |  | 0.7374 |  |  |  |
Class A Convertible Preferred Stock Units | In Arrears At Annual Rate |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Stock dividend rate per unit (in dollars per unit) | $ / shares |  |  |  |  |  |  |  | $ 2.9496 |  |  |  |
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 units) |  |  |  |  |  | 22,249,494 |  |  |  |  |  |
Cash purchase price per unit (in dollars per unit) | $ / shares |  |  |  |  |  | $ 33.71 |  |  |  |  |  |
Number of initial purchasers | buyer |  |  |  |  |  | 2 |  |  |  |  |  |

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