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Investment Securities and Certificates of Deposit (Tables)
 6 Months Ended
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]  
Unrealized Gain (Loss) on Investments The Company's Investment Securities and Certificates of Deposit as of June 30, 2021 and December 31, 2020 were as follows:
 June 30, 2021December 31, 2020
 CostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair ValueCostGross
Unrealized
Gains		Gross
Unrealized
Losses		Fair Value
Debt Securities$278,979 $5 $— $278,984 $402,824 $39 $— $402,863 
Equity Securities2,621 1,786 — 4,407 666 — 73 593 
Debt Securities Carried by Broker-Dealers519,874 14 — 519,888 550,002 27 3 550,026 
Investment Funds110,329 26,798 — 137,127 87,612 19,742 — 107,354 
Total Investment Securities (carried at fair value)$911,803 $28,603 $— $940,406 $1,041,104 $19,808 $76 $1,060,836 
Certificates of Deposit (carried at contract value)122,510 — 
Total Investment Securities and Certificates of Deposit$1,062,916 $1,060,836 
Investments Classified by Contractual Maturity Date
Scheduled maturities of the Company's available-for-sale debt securities as of June 30, 2021 and December 31, 2020 were as follows:
 June 30, 2021December 31, 2020
 Amortized
Cost		Fair ValueAmortized
Cost		Fair Value
Due within one year$278,979 $278,984 $402,824 $402,863 
Total$278,979 $278,984 $402,824 $402,863