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Partners' Capital, Mezzanine Capital and Distributions (Redeemable Noncontrolling Interest - Narrative) (Details) - USD ($) |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 14, 2020 | Sep. 23, 2019 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Redeemable noncontrolling interest redemption value adjustments |  |  | $ 4,791,000 | $ 4,086,000 |
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions |  |  | 4,093,000 |  |
Redemption accretion fair value adjustment |  |  | $ 698,000 |  |
Redeemable Noncontrolling Interest Preferred Units |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Number of preferred units outstanding (in units) |  |  | 161,209 |  | 141,249
Subsidiary | Alkali Holdings |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Issuance of redeemable noncontrolling interest |  | $ 55,000,000 |  |  |
Facility expansion costs percentage |  | 100.00% |  |  |
Expansion project extension period | 1 year |  |  |  |
Equity preferred units issued (in shares) | 1,750 |  | 18,100 |  |
Commitment period | 4 years |  |  |  |
Period for occurrence of triggering events |  | 6 years 6 months |  |  |
Redeemable noncontrolling interest redemption value adjustments |  |  | $ 4,800,000 | 4,100,000 |
Redeemable noncontrolling interest redemption value adjustments allocated to PIK distributions |  |  | 4,100,000 | 3,300,000 |
Redemption accretion fair value adjustment |  |  | 700,000 | $ 800,000 |
Redemption value of redeemable preferred noncontrolling interest |  |  | $ 212,900,000 |  |
Subsidiary | Alkali Holdings | Redeemable Noncontrolling Interest Preferred Units |  |  |  |  |
Redeemable Noncontrolling Interest [Line Items] |  |  |  |  |
Number of preferred units outstanding (in units) |  | 55,000 | 161,209 |  |
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 | $ 350,000,000 |  |  |

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- Definition The fair value as of the reporting date of noncontrolling interests which are redeemable by the (parent) entity (1) at a fixed or determinable price on a fixed or determinable date, (2) at the option of the holder of the noncontrolling interest, or (3) upon occurrence of an event that is not solely within the control of the (parent) entity. The noncontrolling interest holder's ownership (or holders' ownership) may be in the form of preferred shares (regardless of class), preferred partnership units (regardless of class), preferential membership interests, or any other form of preferred equity regardless of investee entity legal form. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph (12)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 15 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 3A -Subparagraph 14 -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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- Definition The number of securities classified as temporary equity that have been issued and are held by the entity's shareholders. Securities outstanding equals securities issued minus securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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