Software and Other Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Carrying Amount and Accumulated Amortization of Software and Other Intangible Assets

The carrying amount and accumulated amortization of the Company's software assets subject to amortization at each balance sheet date are as follows (in thousands):

	September 30, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Balance		Gross Carrying Amount		Accumulated Amortization		Net Balance
Software for resale	$	129,771	$	(127,842)	$	1,929	$	130,261	$	(123,418)	$	6,843
Software for internal use	435,706		(270,699)		165,007		430,330		(240,717)		189,613
Total software	$	565,477	$	(398,541)	$	166,936	$	560,591	$	(364,135)	$	196,456

The carrying amount and accumulated amortization of the Company’s other intangible assets subject to amortization at each balance sheet date are as follows (in thousands):

	September 30, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Balance		Gross Carrying Amount		Accumulated Amortization		Net Balance
Customer relationships	$	508,808	$	(221,889)	$	286,919	$	512,389	$	(197,787)	$	314,602
Trademarks and trade names	23,895		(18,155)		5,740		24,115		(16,734)		7,381
Total other intangible assets	$	532,703	$	(240,044)	$	292,659	$	536,504	$	(214,521)	$	321,983

Schedule of Estimated Intangible Asset Amortization Expense in Future Fiscal Years

Based on capitalized intangible assets as of September 30, 2021, estimated amortization expense amounts in future fiscal years are as follows (in thousands):

Fiscal Year Ending December 31,	Software Amortization		Other Intangible Assets Amortization
Remainder of 2021	$	17,995	$	9,208
2022	57,903		36,681
2023	39,950		36,364
2024	24,135		31,860
2025	19,171		23,293
Thereafter	7,782		155,253
Total	$	166,936	$	292,659