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Fair Value Measurements | 6 Months Ended
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Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Fair Value Measurements | FAIR VALUE MEASUREMENTS Financial Instruments Investments We retained an interest in CSI Compressco, which was acquired by Kodiak on April 1, 2024; we received shares of Kodiak in exchange for our common units in CSI Compressco in connection with such acquisition. In December 2021, we invested in a $5.0 million convertible note issued by CarbonFree. In addition, we receive stock of Standard Lithium under the terms of our arrangements as noted in Note 4 - “Investments.” Our investments in Kodiak, Standard Lithium, and, formerly, CSI Compressco are recorded in investments on our consolidated balance sheets based on the quoted market stock price (Level 1 fair value measurements). The stock component of consideration received from Standard Lithium was initially recorded as unearned income based on the quoted market price at the time the stock is received, then recognized in income over the contract term. Changes in the value of stock are recorded in other (income) expense, net in our consolidated statements of operations. Our investment in convertible notes and common units issued by CarbonFree is recorded in our consolidated financial statements based on an internal valuation with assistance from a third-party valuation specialist (Level 3 fair value measurement). The valuation is impacted by key assumptions, including the assumed probability and timing of potential debt or equity offerings. The convertible note includes an option to convert the note into equity interests issued by CarbonFree. The change in the fair value of the embedded option is included in other (income) expense, net in our consolidated statements of operations. The change in the fair value of the convertible note, excluding the embedded option, and common units are included in other comprehensive income (loss) in our consolidated statements of comprehensive income. The change in our investments for the three-month and six-month periods ended June 30, 2024 and 2023 are as follows:
| Three Months Ended June 30, 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 | $ | 13,148 |  |  | $ | 7,238 |  |  | $ | 20,386 |
Unrealized gain on equity securities | 131 |  |  | — |  |  | 131 |
Unrealized loss on embedded option | — |  |  | (85) |  |  | (85) |
Unrealized loss on convertible note, excluding embedded option | — |  |  | (5) |  |  | (5) |
Investment balance at end of period | $ | 13,279 |  |  | $ | 7,148 |  |  | $ | 20,427 |
| Three Months Ended June 30, 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 | $ | 7,963 |  |  | $ | 5,939 |  |  | $ | 13,902 |
Purchase of investments | — |  |  | 250 |  |  | 250 |
Unrealized gain on equity securities | 2,236 |  |  | — |  |  | 2,236 |
Unrealized gain on embedded option | — |  |  | 123 |  |  | 123 |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 207 |  |  | 207 |
Investment balance at end of period | $ | 10,199 |  |  | $ | 6,519 |  |  | $ | 16,718 |
| Six Months Ended June 30, 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 | 3,125 |  |  | — |  |  | 3,125 |  |  |
Unrealized loss on embedded option | — |  |  | (284) |  |  | (284) |  |  |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 232 |  |  | 232 |  |  |
Investment balance at end of period | $ | 13,279 |  |  | $ | 7,148 |  |  | $ | 20,427 |  |  |
| Six Months Ended June 30, 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 |  |  |
Purchase of investments | — |  |  | 250 |  |  | 250 |  |  |
Unrealized gain on equity securities | 2,052 |  |  | — |  |  | 2,052 |  |  |
Unrealized loss on embedded option | — |  |  | (198) |  |  | (198) |  |  |
Unrealized gain on convertible note, excluding embedded option | — |  |  | 328 |  |  | 328 |  |  |
Investment balance at end of period | $ | 10,199 |  |  | $ | 6,519 |  |  | $ | 16,718 |  |  |
Recurring fair value measurements by valuation hierarchy as of June 30, 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 |  | June 30, 2024 |  | (Level 1) |  | (Level 2) |  | (Level 3)
|  | (in thousands)
Investment in Kodiak |  | $ | 12,279 |  |  | $ | 12,279 |  |  | $ | — |  |  | $ | — |
Investment in CarbonFree |  | 6,798 |  |  | — |  |  | — |  |  | 6,798 |
Investment in Standard Lithium |  | 1,000 |  |  | 1,000 |  |  | — |  |  | — |
Other investments |  | 350 |  |  | — |  |  | — |  |  | 350 |
Total investments |  | $ | 20,427 |  |  |  |  |  |  |
|  |  |  | 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 |  |  |  |  |  |  |
Other The fair values of cash, restricted cash, accounts receivable, accounts payable, accrued liabilities, short-term borrowings and long-term debt approximate their carrying amounts. See Note 5 - “Long-Term Debt and Other Borrowings” for further discussion.

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