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Investment Securities and Certificates of Deposit (Tables)
 3 Months Ended
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]  
Unrealized Gain (Loss) on Investments
The Company's Investment Securities and Certificates of Deposit as of March 31, 2023 and December 31, 2022 were as follows:
 March 31, 2023December 31, 2022
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueCostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Debt Securities$117,508 $34 $— $117,542 $802,652 $4,483 $— $807,135 
Equity Securities558 — 60 498 558 — 223 335 
Debt Securities Carried by EGL494,113 1,437 — 495,550 363,824 1,814 — 365,638 
Investment Funds145,784 521 3,701 142,604 144,343 531 8,156 136,718 
Total Investment Securities (carried at fair value)$757,963 $1,992 $3,761 $756,194 $1,311,377 $6,828 $8,379 $1,309,826 
Certificates of Deposit (carried at contract value)46,948 122,890 
Total Investment Securities and Certificates of Deposit$803,142 $1,432,716 
Investments Classified by Contractual Maturity Date
Scheduled maturities of the Company's available-for-sale debt securities as of March 31, 2023 and December 31, 2022 were as follows:
 March 31, 2023December 31, 2022
 Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Due within one year$116,538 $116,565 $800,710 $805,190 
Due after one year through five years970 977 1,942 1,945 
Total$117,508 $117,542 $802,652 $807,135