Goodwill and Intangible Assets

The Company has two operating segments: (i) Market Making; (ii) Execution Services; and one non-operating segment: Corporate. As of March 31, 2019 and December 31, 2018, the Company’s total amount of goodwill recorded was $1,193.7 million and $836.6 million, respectively. The Company recognized $357.3 million of goodwill in connection with the ITG Acquisition, which was recorded in the Execution Services segment. No goodwill impairment was recognized during the three months ended March 31, 2019 and 2018.

The following table presents the details of goodwill by segment:



(in thousands)	Market Making		Execution Services			Corporate		Total
Balance as of December 31, 2018	$	755,292	$	81,291		$	—	$	836,583
Goodwill recognized in ITG Acquisition	—		357,334			—		357,334
Currency translation adjustment	—		(220		)	$	—	(220		)
Balance as of March 31, 2019	$	755,292	$	438,405		$	—	$	1,193,697

As of March 31, 2019 and December 31, 2018, the Company's total amount of intangible assets recorded was $552.5 million and $84.0 million, respectively. The Company acquired $479.6 million of intangible assets in connection with the ITG Acquisition. Acquired intangible assets consisted of the following as of March 31, 2019 and December 31, 2018:



	As of March 31, 2019
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Useful Lives (Years)
Purchased technology	$	110,000	$	110,000	$	—	1.4	to	2.5
ETF issuer relationships	950		691		259			9
ETF buyer relationships	950		691		259			9
Technology	153,000		36,538		116,462		1	to	6
Customer relationships	432,000		10,238		421,762		10	to	12
Trade name	3,600		100		3,500			3
Favorable occupancy leases	5,895		1,428		4,467		3	to	15
Exchange memberships	5,838		—		5,838		Indefinite
	$	712,233	$	159,686	$	552,547



	As of December 31, 2018
(in thousands)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Useful Lives (Years)
Purchased technology	$	110,000	$	110,000	$	—	1.4	to	2.5
ETF issuer relationships	950		665		285			9
ETF buyer relationships	950		665		285			9
Technology	60,000		30,185		29,815		1	to	6
Customer relationships	49,000		5,905		43,095			12
Favorable occupancy leases	5,895		1,224		4,671		3	to	15
Exchange memberships	5,838		—		5,838		Indefinite
	$	232,633	$	148,644	$	83,989

Amortization expense relating to finite-lived intangible assets was approximately $10.9 million and $6.9 million for the three months ended March 31, 2019 and 2018, respectively. This is included in Amortization of purchased intangibles and acquired capitalized software in the accompanying condensed consolidated statements of comprehensive income.