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Partners' Capital, Mezzanine Capital and Distributions (Changes in Redeemable Noncontrolling Interests) (Details) - USD ($) $ in Thousands |  | 3 Months Ended
--- | --- | ---
Apr. 14, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Redeemable Noncontrolling Interest, Equity [Roll Forward] |  |  |
Balance as of December 31, 2020 |  | $ 141,194 |
Issuance of preferred units, net of issuance costs |  | 19,561 |
PIK distribution |  | 4,093 |
Redemption accretion |  | 698 |
Tax distributions (1) |  | (1,891) |
Balance as of March 31, 2021 |  | 163,655 |
Subsidiary | Alkali Holdings |  |  |
Redeemable Noncontrolling Interest, Equity [Roll Forward] |  |  |
PIK distribution |  | 4,100 | $ 3,300
Redemption accretion |  | $ 700 | $ 800
Redeemable Noncontrolling Interest [Line Items] |  |  |
Equity preferred units issued to pay tax distributions (in shares) |  | 1,860 |
Equity preferred units issued (in shares) | 1,750 | 18,100 |

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- Definition As of the reporting date, the carrying amount 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 14 -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 (16)(c) -URI http://asc.fasb.org/extlink&oid=65877616&loc=SL6540498-122764 + Details
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