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Investments in debt and equity securities
9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Investments in debt and equity securities Short-term and long-term investments
The Company’s short-term and long-term debt and equity investments, consisting of debt instruments classified as held-to-maturity and equity investments with readily determinable fair values or redemption values, were as follows:
 September 30, 2021December 31, 2020
Debt
securities
Equity
securities
TotalDebt
securities
Equity
securities
Total
Certificates of deposit and other time deposits$8,225 $— $8,225 $8,217 $— $8,217 
Investments in mutual funds and common stocks— 52,063 52,063 — 44,077 44,077 
 $8,225 $52,063 $60,288 $8,217 $44,077 $52,294 
Short-term investments$8,225 $18,465 $26,690 $8,217 $11,884 $20,101 
Long-term investments— 33,598 33,598 — 32,193 32,193 
 $8,225 $52,063 $60,288 $8,217 $44,077 $52,294 
Debt securities: The Company's short-term debt investments are principally bank certificates of deposit with contractual maturities longer than three months but shorter than one year. These debt securities are accounted for as held to maturity and recorded at amortized cost, which approximated their fair values at September 30, 2021 and December 31, 2020.
Equity securities: During the nine months ended September 30, 2021 certain of the Company’s equity investments previously accounted for under the adjusted cost method now have readily determinable fair values from public markets. As a result, these investments were reclassified from equity method and other investments to short-term investments during that period. The Company recognized $10,314 and $1,986 in net unrealized losses on these investments during the three and nine months ended September 30, 2021, respectively, which were valued at $15,264 as of September 30, 2021. The Company's remaining short-term and long-term equity investments are held within a trust to fund existing obligations associated with the Company’s non-qualified deferred compensation plans.