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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2022
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring
Recurring and nonrecurring fair value measurements by valuation hierarchy as of September 30, 2022 and December 31, 2021, are as follows:

  Fair Value Measurements Using
Total as ofQuoted Prices in Active Markets for Identical Assets or LiabilitiesSignificant Other Observable InputsSignificant Unobservable Inputs
DescriptionSeptember 30, 2022(Level 1)(Level 2)(Level 3)
(in thousands)
Investment in CSI Compressco
$6,128 $6,128 $— $— 
Investment in CarbonFree5,453 — — 5,453 
Investment in Standard Lithium1,732 1,732 — — 
Investments$13,313 
   Fair Value Measurements Using
Total as of Quoted Prices in Active Markets for Identical Assets or LiabilitiesSignificant Other Observable InputsSignificant Unobservable Inputs
DescriptionDecember 31, 2021(Level 1)(Level 2)(Level 3)
(in thousands)
Investment in CSI Compressco
$6,233 $6,233 $— $— 
Investment in CarbonFree5,000 — — 5,000 
Investments$11,233