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Investments (Tables) | 6 Months Ended
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Jun. 30, 2022
Investments in and Advances to Affiliates [Abstract] |
Summary of Investments | Our investments as of June 30, 2022 and December 31, 2021, consist of the following:
| June 30, 2022 |  | December 31, 2021
| (in thousands)
Investment in CSI Compressco | $ | 6,862 |  |  | $ | 6,233 |
Investment in CarbonFree | 5,609 |  |  | 5,000 |
Investment in Standard Lithium | $ | 1,696 |  |  | $ | — |
Total Investments | $ | 14,167 |  |  | $ | 11,233 |

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- Definition Tabular disclosure of investments in and advances to affiliates. Does not include the tabular disclosure of the disaggregation of investments in and advances to affiliates across legal entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14) -URI http://asc.fasb.org/extlink&oid=122147990&loc=d3e611322-123010 + Details
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