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Fair Value Measurements (Tables)
9 Months Ended
Sep. 30, 2021
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, 2021 and December 31, 2020, 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, 2021(Level 1)(Level 2)(Level 3)
(In Thousands)
Investment in CSI Compressco
$9,404 $9,404 $— $— 
Investment in Standard Lithium13,008 13,008 — — 
Warrants liability(56)— — (56)
Net asset$22,356 
   Fair Value Measurements Using
Total as of Quoted Prices in Active Markets for Identical Assets or LiabilitiesSignificant Other Observable InputsSignificant Unobservable Inputs
DescriptionDecember 31, 2020(Level 1)(Level 2)(Level 3)
(In Thousands)
Investment in Standard Lithium$2,675 $2,675 — $— 
Warrants liability(198)— — (198)
Net asset$2,477