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Investments (Tables)
 6 Months Ended
Jun. 30, 2020
Investments, Debt and Equity Securities [Abstract]  
Summary of Investments
Investments consisted of the following at June 30, 2020 and December 31, 2019 (amounts in thousands):
June 30, 2020December 31, 2019
Debt securities
Available-for-sale$4,767  $5,052  
Equity securities
Private equity funds5,588  7,218  
Mutual funds743  33,677  
Equity method investments7,648  10,229  
Total investments$18,746  $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 June 30, 2020 and December 31, 2019 were as follows (amounts in thousands):
June 30, 2020
Amortized CostGross Unrealized GainsGross Unrealized LossesAggregate Fair Value
Available-for-sale
Government bonds$4,589  $178  $—  $4,767  
December 31, 2019
Amortized CostGross Unrealized GainsGross Unrealized LossesAggregate Fair Value
Available-for-sale
Government bonds$5,095  $—  $43  $5,052