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Investment Securities and Certificates of Deposit (Tables)
 9 Months Ended
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Unrealized Gain (Loss) on Investments
The Company's Investment Securities and Certificates of Deposit as of September 30, 2021 and December 31, 2020 were as follows:
 September 30, 2021December 31, 2020
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueCostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Debt Securities$452,955 $19 $— $452,974 $402,824 $39 $— $402,863 
Equity Securities666 376 — 1,042 666 — 73 593 
Debt Securities Carried by Broker-Dealers564,837 42 2 564,877 550,002 27 3 550,026 
Investment Funds110,246 26,310 — 136,556 87,612 19,742 — 107,354 
Total Investment Securities (carried at fair value)$1,128,704 $26,747 $2 $1,155,449 $1,041,104 $19,808 $76 $1,060,836 
Certificates of Deposit (carried at contract value)114,512 — 
Total Investment Securities and Certificates of Deposit$1,269,961 $1,060,836 
Investments Classified by Contractual Maturity Date
Scheduled maturities of the Company's available-for-sale debt securities as of September 30, 2021 and December 31, 2020 were as follows:
 September 30, 2021December 31, 2020
 Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Due within one year$452,955 $452,974 $402,824 $402,863 
Total$452,955 $452,974 $402,824 $402,863