Software and Other Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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):

	March 31, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Balance		Gross Carrying Amount		Accumulated Amortization		Net Balance
Software for resale	$	130,560	$	(125,683)	$	4,877	$	130,261	$	(123,418)	$	6,843
Software for internal use	437,776		(251,713)		186,063		430,330		(240,717)		189,613
Total software	$	568,336	$	(377,396)	$	190,940	$	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):

	March 31, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Balance		Gross Carrying Amount		Accumulated Amortization		Net Balance
Customer relationships	$	510,927	$	(205,786)	$	305,141	$	512,389	$	(197,787)	$	314,602
Trademarks and trade names	23,994		(17,160)		6,834		24,115		(16,734)		7,381
Total other intangible assets	$	534,921	$	(222,946)	$	311,975	$	536,504	$	(214,521)	$	321,983

Schedule of Estimated Intangible Asset Amortization Expense in Future Fiscal Years

Based on capitalized intangible assets as of March 31, 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	$	52,704	$	27,741
2022	53,368		36,831
2023	35,986		36,497
2024	21,982		31,968
2025	19,167		23,359
Thereafter	7,733		155,579
Total	$	190,940	$	311,975