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Goodwill and Intangible Assets (Tables)
12 Months Ended
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Schedule of goodwill by segment The following table presents the details of goodwill by segment as of December 31, 2020 and December 31, 2019:
(in thousands)Market MakingExecution ServicesCorporateTotal
Balance as of December 31$755,292 $393,634 $— $1,148,926 
Schedule of acquired intangible assets Acquired intangible assets consisted of the following as of December 31, 2020 and December 31, 2019:
 As of December 31, 2020
(in thousands)Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives
(Years) 
Customer relationships$486,600 $(94,299)$392,301 10to12
Technology136,000 (82,403)53,597 1to6
Favorable occupancy leases5,895 (2,839)3,056 3to15
Exchange memberships3,998 — 3,998 Indefinite
Trade name3,600 (2,200)1,400 3
ETF issuer relationships950 (877)73 9
ETF buyer relationships950 (876)74 9
 $637,993 $(183,494)$454,499 
As of December 31, 2019
(in thousands)Gross Carrying AmountAccumulated AmortizationNet Carrying AmountUseful Lives
(Years)
Customer relationships$486,600 $(46,456)$440,144 10to12
Technology136,000 (58,203)77,797 1to6
Purchased technology110,000 (110,000)— 1.4to2.5
Favorable occupancy leases5,895 (2,040)3,855 3to15
Exchange memberships4,882 — 4,882 Indefinite
Trade name3,600 (1,000)2,600 3
ETF issuer relationships950 (770)180 9
ETF buyer relationships950 (770)180 9
$748,877 $(219,239)$529,638 
Schedule of finite-lived intangible assets, future amortization expense
The Company expects to record amortization expense as follows over the next five years ended December 31:

(in thousands)
2021$69,676 
202264,852 
202363,960 
202450,845 
202547,879