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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill by segment
The following table presents the details of goodwill by segment as of March 31, 2024 and December 31, 2023:
(in thousands)Market MakingExecution ServicesCorporateTotal
Balance as of period-end$755,292 $393,634 $— $1,148,926 
Schedule of acquired intangible assets Acquired intangible assets consisted of the following as of March 31, 2024 and December 31, 2023:
 As of March 31, 2024
(in thousands)Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives
(Years) 
Customer relationships$486,600 $(249,791)$236,809 10to12
Technology136,000 (136,000)— 1to6
Favorable occupancy leases5,895 (5,369)526 3to15
Exchange memberships3,998 — 3,998 Indefinite
Trade name3,600 (3,600)— 3
ETF issuer relationships950 (950)— 9
ETF buyer relationships950 (950)— 9
Other$1,500 $— $1,500 Indefinite
 $639,493 $(396,660)$242,833 
As of December 31, 2023
(in thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountUseful Lives
(Years)
Customer relationships$486,600 $(237,829)$248,771 10to12
Technology136,000 (133,467)2,533 1to6
Favorable occupancy leases5,895 (5,177)718 3to15
Exchange memberships3,998 — 3,998 Indefinite
Trade name3,600 (3,600)— 3
ETF issuer relationships950 (950)— 9
ETF buyer relationships950 (950)— 9
Other$1,500 $— $1,500 Indefinite
$639,493 $(381,973)$257,520 
Schedule of finite-lived intangible assets, future amortization expense
The Company expects to record amortization expense as follows over the next five subsequent years:

(in thousands)
Remainder of 2024$36,158 
202547,879 
202647,879 
202747,879 
202847,879 
20299,590