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Investment Securities and Certificates of Deposit (Tables)
 3 Months Ended
Mar. 31, 2022
Investments, Debt and Equity Securities [Abstract]  
Unrealized Gain (Loss) on Investments
The Company's Investment Securities and Certificates of Deposit as of March 31, 2022 and December 31, 2021 were as follows:
 March 31, 2022December 31, 2021
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueCostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Debt Securities$286,567 $10 $— $286,577 $706,826 $37 $16 $706,847 
Equity Securities666 203 — 869 666 193 — 859 
Debt Securities Carried by EGL489,541 49 — 489,590 784,813 43 14 784,842 
Investment Funds144,781 17,644 — 162,425 111,682 39,191 — 150,873 
Total Investment Securities (carried at fair value)$921,555 $17,906 $— $939,461 $1,603,987 $39,464 $30 $1,643,421 
Certificates of Deposit (carried at contract value)157,313 141,218 
Total Investment Securities and Certificates of Deposit$1,096,774 $1,784,639 
Investments Classified by Contractual Maturity Date
Scheduled maturities of the Company's available-for-sale debt securities as of March 31, 2022 and December 31, 2021 were as follows:
 March 31, 2022December 31, 2021
 Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Due within one year$286,567 $286,577 $706,826 $706,847 
Total$286,567 $286,577 $706,826 $706,847