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Investments in debt and equity securities
 3 Months Ended
Mar. 31, 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:
 March 31, 2021December 31, 2020
Debt
securities		Equity
securities		TotalDebt
securities		Equity
securities		Total
Certificates of deposit and other time deposits$8,221 $— $8,221 $8,217 $— $8,217 
Investments in mutual funds and common stock— 34,730 34,730 — 44,077 44,077 
 $8,221 $34,730 $42,951 $8,217 $44,077 $52,294 
Short-term investments$8,221 $2,839 $11,060 $8,217 $11,884 $20,101 
Long-term investments— 31,891 31,891 — 32,193 32,193 
 $8,221 $34,730 $42,951 $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 March 31, 2021 and December 31, 2020.
Equity securities: The Company's equity investments in mutual funds and common stock are held within a trust to fund existing obligations associated with several of the Company’s non-qualified deferred compensation plans.