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Partners' Capital, Mezzanine Equity and Distributions (Redeemable Noncontrolling Interest- Narrative) (Details) |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 14, 2020 USD ($) shares | Sep. 23, 2019 USD ($) manager d $ / shares shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Issuance of Preferred Units |  | $ 55,000,000 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred Units, Units issued | shares |  |  |  | 9,499 |  |
Net income attributable to redeemable noncontrolling interests |  |  |  | $ (16,113,000) | $ (2,233,000) | $ 0
Distribution paid-in-kind |  |  | $ 1,750,000 | 13,811,000 |  |
Redemption accretion |  |  | $ 483,000 | $ 2,302,000 |  |
Redeemable Non Controlling Interest |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Convertible preferred units outstanding (in units) | shares |  |  | 130,000 | 141,249 | 130,000 |
Genesis Alkali Holdings Company, LLC [Member] | Redeemable Non Controlling Interest |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Convertible preferred units outstanding (in units) | shares |  |  |  | 141,249 |  |
Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member] |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Issuance of Preferred Units |  | $ 55,000,000 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Commitment Period | 4 years | 3 years |  |  |  |
Facility Expansion Costs, Funding Percentage |  | 100.00% |  |  |  |
Redeemable Noncontrolling Interest, Project Extension Period | 1 year |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred Units, Units issued | shares | 1,750 |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Annual Percentage For Quarterly Distributions |  | 10.00% |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Liquidation Preference Per Unit | $ / shares |  | $ 1,000 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Days In Period After End Of Fiscal Quarter To Pay Cash Distributions | d |  | 45 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Period After Initial Closing Date To Pay Distributions Paid-in-kind |  | 48 months |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Minimum Cash Reserve Balance |  | $ 5,000,000 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Purchase Price Per Unit | $ / shares |  | $ 1,000 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Period For Triggering Event To Occur |  | 6 years 6 months |  |  |  |
Net income attributable to redeemable noncontrolling interests |  |  |  | $ (16,100,000) | $ (2,300,000) |
Distribution paid-in-kind |  |  |  | 13,800,000 | 1,800,000 |
Redemption accretion |  |  |  | 2,300,000 | $ 500,000 |
Redeemable Noncontrolling Interest, Equity, Preferred, Fair Value |  |  |  | $ 194,800,000 |  |
Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member] | Redeemable Non Controlling Interest |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Convertible preferred units outstanding (in units) | shares |  | 55,000 |  |  |  |
Minimum | Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member] |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Amount Authorized |  | $ 251,750,000 |  |  |  |
Number Board Of Managers | manager |  | 5 |  |  |  |
Number Of Board Managers Designated By The Partnership | manager |  | 3 |  |  |  |
Number Of Board Managers Designated By The Sponsor | manager |  | 1 |  |  |  |
Number Of Independent Board Managers | manager |  | 1 |  |  |  |
Maximum | Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member] |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |
Convertible preferred units outstanding (in units) | shares | 351,750 | 350,000 |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Amount Authorized | $ 351,750,000 | $ 350,000,000 |  |  |  |

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