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Fair Value Measurements (Tables) | 3 Months Ended
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Mar. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value Measurements, Recurring and Nonrecurring | Recurring fair value measurements by valuation hierarchy as of March 31, 2024 and December 31, 2023 are as follows:
|  |  |  | Fair Value Measurements Using
|  | Total as of |  | Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Description |  | March 31, 2024 |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (in thousands)
Investment in CSI Compressco |  | $ | 12,204 |  |  | $ | 12,204 |  |  | $ | — |  |  | $ | — |
Investment in CarbonFree |  | 6,888 |  |  | — |  |  | — |  |  | 6,888 |
Investment in Standard Lithium |  | 944 |  |  | 944 |  |  | — |  |  | — |
Other investments |  | 350 |  |  | — |  |  | — |  |  | 350 |
Total investments |  | $ | 20,386 |  |  |  |  |  |  |
|  |  |  | Fair Value Measurements Using
|  | Total as of |  | Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Description |  | December 31, 2023 |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (in thousands)
Investment in CSI Compressco |  | $ | 8,538 |  |  | $ | 8,538 |  |  | $ | — |  |  | $ | — |
Investment in CarbonFree |  | 6,850 |  |  | — |  |  | — |  |  | 6,850 |
Investment in Standard Lithium |  | 1,616 |  |  | 1,616 |  |  | — |  |  | — |
Other investments |  | 350 |  |  | — |  |  | — |  |  | 350 |
Investments |  | $ | 17,354 |  |  |  |  |  |  |
Investment | The change in our investments for the three-month periods ended March 31, 2024 and 2023 are as follows:
| Three Months Ended March 31, 2024 |  |
| Fair Value Measurements Using |  |
| Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Unobservable Inputs |  |  |  |
| (Level 1) |  | (Level 3) |  | Total |  |
| (in thousands)
Investment balance at beginning of period | $ | 10,154 |  |  | $ | 7,200 |  |  | $ | 17,354 |  |  |
Unrealized gain on equity securities | 2,994 |  |  | — |  |  | 2,994 |  |  |
Unrealized loss on embedded option | — |  |  | (199) |  |  | (199) |  |  |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 237 |  |  | 237 |  |  |
Investment balance at end of period | $ | 13,148 |  |  | $ | 7,238 |  |  | $ | 20,386 |  |  |
| Three Months Ended March 31, 2023 |  |
| Fair Value Measurements Using |  |
| Quoted Prices in Active Markets for Identical Assets or Liabilities |  | Significant Unobservable Inputs |  |  |  |
| (Level 1) |  | (Level 3) |  | Total |  |
| (in thousands)
Investment balance at beginning of period | $ | 8,147 |  |  | $ | 6,139 |  |  | $ | 14,286 |  |  |
Unrealized loss on equity securities | (184) |  |  | — |  |  | (184) |  |  |
Unrealized loss on embedded option | — |  |  | (321) |  |  | (321) |  |  |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 121 |  |  | 121 |  |  |
Investment balance at end of period | $ | 7,963 |  |  | $ | 5,939 |  |  | $ | 13,902 |  |  |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2C -SubTopic 10 -Topic 820 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2C Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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