Software and Other Intangible Assets

6 Months Ended

Jun. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

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):


	June 30, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Balance		Gross Carrying Amount		Accumulated Amortization		Net Balance
Software for resale	$	130,737	$	(127,237)	$	3,500	$	130,261	$	(123,418)	$	6,843
Software for internal use	445,343		(267,970)		177,373		430,330		(240,717)		189,613
Total software	$	576,080	$	(395,207)	$	180,873	$	560,591	$	(364,135)	$	196,456

Amortization of software for resale is computed using the greater of (a) the ratio of current gross revenues to the total of current and future gross revenues expected to be derived from the software or (b) the straight-line method over the remaining estimated useful life of generally five to ten years. Software for resale amortization expense recorded during the three months ended June 30, 2021 and 2020, totaled $1.4 million and $2.1 million, respectively. Software for resale amortization expense recorded during the six months ended June 30, 2021 and 2020, totaled $3.4 million and $4.0 million, respectively. These software amortization expense amounts are reflected in cost of revenue in the condensed consolidated statements of operations.

Amortization of software for internal use is computed using the straight-line method over an estimated useful life of generally three to eight years. Software for internal use amortization expense recorded during the three months ended June 30, 2021 and 2020, totaled $17.4 million and $18.5 million, respectively. Software for internal use amortization expense recorded during the six months ended June 30, 2021 and 2020, totaled $34.3 million and $35.2 million, respectively. These software amortization expense amounts are reflected in depreciation and amortization in the condensed consolidated statements of operations.

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):


	June 30, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Balance		Gross Carrying Amount		Accumulated Amortization		Net Balance
Customer relationships	$	511,710	$	(214,845)	$	296,865	$	512,389	$	(197,787)	$	314,602
Trademarks and trade names	24,049		(17,763)		6,286		24,115		(16,734)		7,381
Total other intangible assets	$	535,759	$	(232,608)	$	303,151	$	536,504	$	(214,521)	$	321,983

Other intangible assets amortization expense recorded during both the three months ended June 30, 2021 and 2020, totaled $9.2 million. Other intangible assets amortization expense recorded during both the six months ended June 30, 2021 and 2020, totaled $18.5 million.

Based on capitalized intangible assets as of June 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	$	36,132	$	18,518
2022	56,235		36,881
2023	38,403		36,551
2024	23,197		32,016
2025	19,123		23,398
Thereafter	7,783		155,787
Total	$	180,873	$	303,151