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Fair Value Measures and Disclosures (Tables)
9 Months Ended
Sep. 30, 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):

Level in Fair Fair Value
Value HierarchySeptember 30, 2021December 31, 2020
Other non-current assets:
Equity securities (1)
1$13,129 N/A

(1) Represents our investment in TuSimple Class A common stock. For additional information regarding the valuation of our investment in TuSimple, see Note 6 – Investments.