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Fair Value Measures and Disclosures (Tables)
12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
The following table presents the Company's fair value hierarchy for assets measured at fair value on a recurring basis (in thousands):
Fair Value
Level in FairDecember 31,
Value Hierarchy20212020
Other non-current assets:
Equity securities (1)
1$17,166 N/A
(1) Represents our investments in autonomous technology companies. For additional information regarding the valuation of these equity securities, see Note 7 – Investments.