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Partners' Capital, Mezzanine Capital and Distributions (Redeemable Noncontrolling Interest - Narrative) (Details) - USD ($) |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Apr. 14, 2020 | Sep. 23, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Redeemable noncontrolling interest redemption value adjustments |  |  | $ 7,082,000 | $ 4,149,000 | $ 17,639,000 | $ 12,394,000 |
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions |  |  |  |  | 14,856,000 |  |
Redemption accretion fair value adjustment |  |  |  |  | $ 2,783,000 |  |
Redeemable Noncontrolling Interest Preferred Units |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Number of preferred units outstanding (in units) |  |  | 246,394 |  | 246,394 |  | 141,249
Subsidiary | Alkali Holdings |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Issuance of redeemable noncontrolling interest |  | $ 55,000,000 |  |  |  |  |
Redeemable noncontrolling interest preferred commitment |  | $ 350,000,000 |  |  |  |  |
Facility expansion costs percentage |  | 100.00% |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Minimum | $ 251,750,000 | $ 250,000,000 |  |  |  |  |
Expansion project extension period | 1 year |  |  |  |  |  |
Equity preferred units issued (in units) | 1,750 |  |  |  | 95,000 |  |
Commitment period | 4 years |  |  |  |  |  |
Period for occurrence of triggering events |  | 6 years 6 months |  |  |  |  |
Redeemable noncontrolling interest redemption value adjustments |  |  | $ 7,100,000 | 4,200,000 | $ 17,700,000 | 12,400,000 |
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions |  |  | 5,900,000 | 3,500,000 | 14,900,000 | 10,200,000 |
Redemption accretion fair value adjustment |  |  | 1,200,000 | $ 700,000 | 2,800,000 | $ 2,200,000 |
Redemption value of redeemable preferred noncontrolling interest |  |  | $ 289,900,000 |  | $ 289,900,000 |  |
Subsidiary | Alkali Holdings | Redeemable Noncontrolling Interest Preferred Units |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Number of preferred units outstanding (in units) |  | 55,000 | 246,394 |  | 246,394 |  |
Subsidiary | Alkali Holdings | Maximum |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |
Number of preferred units outstanding (in units) | 351,750 |  |  |  |  |  |
Redeemable noncontrolling interest preferred commitment | $ 351,750,000 |  |  |  |  |  |

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