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Partners' Capital, Mezzanine Equity and Distributions (Redeemable Noncontrolling Interest- Narrative) (Details) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 23, 2019 USD ($) d manager $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Issuance of Preferred Units | $ 55,000,000 |  |  |  |  |  |  |  |
Proceeds From Redeemable Noncontrolling Interest |  |  |  |  |  |  | $ 122,900,000 |  |
Net income attributable to redeemable noncontrolling interests |  | $ (1,961,000) |  | $ (272,000) | $ 0 | $ 0 | (2,233,000) | $ 0 | $ 0
Redemption accretion |  |  | $ 455,000 |  |  |  |  |  |
Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Issuance of Preferred Units | $ 55,000,000 |  |  |  |  |  | 130,000,000 |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Commitment Period | 3 years |  |  |  |  |  |  |  |
Facility Expansion Costs, Funding Percentage | 100.00% |  |  |  |  |  |  |  |
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 | 36 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 |  |  |  |  |  |  |  |
Net income attributable to redeemable noncontrolling interests |  |  |  |  |  |  | 2,300,000 |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Paid in Kind Distribution allocation |  |  |  |  |  |  | 1,800,000 |  |
Redemption accretion |  |  |  |  |  |  | 500,000 |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Fair Value |  | $ 192,500,000 | $ 192,500,000 |  |  |  | $ 192,500,000 |  |
Minimum | Genesis Alkali Holdings Company, LLC [Member] | Subsidiaries [Member] |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Amount Authorized | $ 250,000,000 |  |  |  |  |  |  |  |
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] |  |  |  |  |  |  |  |  |
Redeemable Noncontrolling Interest, Equity, Preferred, Amount Authorized | $ 350,000,000 |  |  |  |  |  |  |  |

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