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Fair Value Measures and Disclosures
3 Months Ended
Mar. 31, 2022
Fair Value Disclosures [Abstract]  
Fair Value Disclosures
4. FAIR VALUE MEASUREMENT

The following tables summarize our assets and liabilities measured at fair value on a recurring basis using the following levels of inputs (in thousands): 
 
Fair Value Measurements at March 31, 2022
 TotalLevel 1Level 2Level 3
Assets:    
Cash equivalents—Money market mutual funds$— $— $— $— 
Equity securities, at fair value115,306 366 — 114,940 
Trading securities held in a "rabbi trust" (1)226 226 — — 
Total assets$115,532 $592 $— $114,940 
Liabilities:    
Deferred compensation accrual "rabbi trust" (2)$231 $231 $— $— 
Total liabilities$231 $231 $— $— 
 
 
Fair Value Measurements at December 31, 2021
 TotalLevel 1Level 2Level 3
Assets:    
Cash equivalents—Money market mutual funds$— $— $— $— 
Equity securities, at fair value102,529 174 — 102,355 
Trading securities held in a "rabbi trust" (1)179 179 — — 
Total assets$102,708 $353 $— $102,355 
Liabilities:    
Deferred compensation accrual "rabbi trust" (2)$188 $188 $— $— 
Total liabilities$188 $188 $— $— 
 ___________________________________________
(1)    — Trading securities held in a rabbi trust are included in Prepaids and other current assets and Other long-term assets, net in the consolidated balance sheets.
(2)    — Non-qualified deferred compensation in a rabbi trust is included in Accrued liabilities and Other long-term liabilities in the consolidated balance sheets.

The following table provides activity for our Level 3 investments (in thousands):
Amount
Level 3 investments at December 31, 2020
$— 
Increase due to acquisition of Level 3 investments99,723 
Increase in fair value of Level 3 investments2,632 
Level 3 investments at December 31, 2021
102,355 
Increase due to acquisition of Level 3 investments11,420 
Increase in fair value of Level 3 investments1,165 
Level 3 investments at March 31, 2022
$114,940