Software and Other Intangible Assets

12 Months Ended

Dec. 31, 2019

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):



	December 31, 2019							December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Balance		Gross Carrying Amount		Accumulated Amortization			Net Balance
Software for resale	$	138,823	$	(122,061	)	$	16,762	$	137,666	$	(110,124	)	$	27,542
Software for internal use	400,065		(182,310		)	217,755		251,804		(142,118		)	109,686
Total software	$	538,888	$	(304,371	)	$	234,517	$	389,470	$	(252,242	)	$	137,228

Software for resale amortization expense totaled $11.0 million for the year ended December 31, 2019, and totaled $12.8 million during both the years ended December 31, 2018 and 2017. These software amortization expense amounts are reflected in cost of revenue in the consolidated statements of operations.

Software for internal use amortization expense recorded during the years ended December 31, 2019, 2018, and 2017, totaled $55.6 million, $41.7 million, and $45.2 million, respectively. These software amortization expense amounts are reflected in depreciation and amortization in the 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):



	December 31, 2019							December 31, 2018
	Gross Carrying Amount		Accumulated Amortization			Net Balance		Gross Carrying Amount		Accumulated Amortization			Net Balance
Customer relationships	$	507,785	$	(160,775	)	$	347,010	$	297,991	$	(131,187	)	$	166,804
Trademarks and trade names	27,312		(17,353		)	9,959		16,348		(15,025		)	1,323
Total other intangible assets	$	535,097	$	(178,128	)	$	356,969	$	314,339	$	(146,212	)	$	168,127

Other intangible assets amortization expense recorded during the years ended December 31, 2019, 2018, and 2017, totaled $31.9 million, $19.0 million, and $19.4 million, respectively.

Based on capitalized intangible assets as of December 31, 2019, estimated amortization expense amounts in future fiscal years are as follows (in thousands):



Fiscal Year Ending December 31,	Software Amortization		Other Intangible Assets Amortization
2020	$	70,056	$	37,215
2021	55,595		36,730
2022	37,278		36,583
2023	25,406		36,270
2024	19,983		31,781
Thereafter	26,199		178,390
Total	$	234,517	$	356,969