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Significant Accounting Policies - Fair Value (Details) - Solaris Midstream Holdings, LLC and Subsidiaries - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Carrying Amount | Level 2 | Sustainability-Linked Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 400,000 |
Carrying Amount | Level 3 | Credit Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt |  | $ 297,000
Fair Value | Level 2 | Sustainability-Linked Notes |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt | $ 429,500 |
Fair Value | Level 3 | Credit Facility |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Fair value of debt |  | $ 297,000

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