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Investments (Tables)
 9 Months Ended
Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Investments
Investments consisted of the following at September 30, 2020 and December 31, 2019 (amounts in thousands):
September 30, 2020December 31, 2019
Debt securities
Available-for-sale$4,890 $5,052 
Equity securities
Exchange traded funds19,132 — 
Private equity funds5,818 7,218 
Mutual funds639 33,677 
Equity method investments7,342 10,229 
Total investments$37,821 $56,176 
Schedule of Amortized Cost and Estimated Fair Value in Debt Securities
The amortized cost and estimated fair value of investments in debt securities at September 30, 2020 and December 31, 2019 were as follows (amounts in thousands):
September 30, 2020
Amortized CostGross Unrealized GainsGross Unrealized LossesAggregate Fair Value
Available-for-sale
Government bonds$4,742 $148 $— $4,890 
December 31, 2019
Amortized CostGross Unrealized GainsGross Unrealized LossesAggregate Fair Value
Available-for-sale
Government bonds$5,095 $— $43 $5,052