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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule of Investment Securities
Investment securities consisted of the following:
June 30,
2022		December 31, 2021
Debt securities available for sale$85,371 $103,906 
Equity securities at fair value:
Marketable equity securities14,967 19,560 
Mutual funds invested in debt securities22,056 23,221 
Long-term investment securities at fair value (1)
29,090 32,089 
          Total equity securities at fair value66,113 74,870 
Total investment securities at fair value151,484 178,776 
Less:
Long-term investment securities at fair value (1)
29,090 32,089 
Current investment securities at fair value$122,394 $146,687 
Long-term investment securities at fair value (1)
$29,090 $32,089 
Equity-method investments16,432 20,984 
Total long-term investments$45,522 $53,073 
Equity securities at cost (2)
$6,200 $5,200 
(1) These assets are measured at net asset value (“NAV”) as a practical expedient under ASC 820.
(2) These assets are without readily determinable fair values that do not qualify for the NAV practical expedient and are included in Other assets on the condensed consolidated balance sheets.
The components of debt securities available for sale at June 30, 2022 were as follows:    
CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Marketable debt securities$85,367 $4 $— $85,371 
The components of debt securities available for sale at December 31, 2021 were as follows:
CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair
Value
Marketable debt securities$103,838 $68 $— $103,906 
Schedule of Net (Losses) Gains Recognized
Net (losses) gains recognized on investment securities were as follows:
Three Months EndedSix Months Ended
June 30,June 30,
2022202120222021
Net (losses) gains recognized on equity securities$(3,465)$8,435 $(5,339)$10,809 
Net gains recognized on debt securities available for sale6 10 6 65 
Impairment expense(671)(44)(1,836)(58)
Net (losses) gains recognized on investment securities$(4,130)$8,401 $(7,169)$10,816 
Gross realized gains and losses on debt securities available for sale were as follows:
Three Months EndedSix Months Ended
June 30,June 30,
2022202120222021
Gross realized gains on sales$6 $11 $7 $67 
Gross realized losses on sales(1)(1)(1)(2)
Net gains recognized on debt securities available for sale$5 $10 $6 $65 
Impairment expense$(671)$(44)$(1,836)$(58)
Schedule of Maturity Dates of Debt Securities
The table below summarizes the maturity dates of debt securities available for sale at June 30, 2022.
Investment Type:Fair ValueUnder 1 Year1 Year up to 5 YearsMore than 5 Years
U.S. Government securities$3,072 $2,296 $776 $— 
Corporate securities50,827 27,011 23,816 — 
U.S. mortgage-backed securities25,728 8,557 17,171 — 
Commercial paper4,529 4,529 — — 
Foreign fixed-income securities1,215 1,215 — — 
Total debt securities available for sale by maturity dates
$85,371 $43,608 $41,763 $— 
Summary of Unrealized and Realized Net (Losses) and Gains Recognized
The following is a summary of unrealized and realized net losses and gains recognized in net income on equity securities at fair value during the three and six months ended June 30, 2022 and 2021, respectively:

Three Months EndedSix Months Ended
June 30,June 30,
2022202120222021
Net (losses) gains recognized on equity securities$(3,465)$8,435 $(5,339)$10,809 
Less: Net gains recognized on equity securities sold13 4,054 306 4,223 
Net unrealized (losses) gains recognized on equity securities still held at the reporting date$(3,478)$4,381 $(5,645)$6,586 
Schedule of Equity Method Investments
Equity-method investments consisted of the following:
 June 30,
2022		December 31, 2021
Mutual fund and hedge funds$16,432 $20,984 
Equity in (losses) earnings from investments were:
Three Months EndedSix Months Ended
June 30,June 30,
2022202120222021
Mutual fund and hedge funds$(2,311)$941 $(4,553)$1,518