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Partners' Capital, Mezzanine Capital and Distributions (Changes in Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Apr. 14, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Redeemable Noncontrolling Interest, Equity [Roll Forward] |  |  |  |  |
Balance as of December 31, 2020 |  |  |  | $ 141,194 |
Issuance of preferred units, net of issuance costs |  |  |  | 103,042 |
PIK distribution |  |  |  | 14,856 |
Redemption accretion |  |  |  | 2,783 |
Tax distributions |  |  |  | (10,064) |
Balance as of September 30, 2021 |  | $ 251,811 |  | 251,811 |
Subsidiary | Alkali Holdings |  |  |  |  |
Redeemable Noncontrolling Interest, Equity [Roll Forward] |  |  |  |  |
PIK distribution |  | 5,900 | $ 3,500 | 14,900 | $ 10,200
Redemption accretion |  | $ 1,200 | $ 700 | $ 2,800 | $ 2,200
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Equity preferred units issued to pay tax distributions (in units) |  |  |  | 10,145 |
Equity preferred units issued (in units) | 1,750 |  |  | 95,000 |

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