Goodwill and Other Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill for the years ended December 31, 2020 and 2019 are as follows:


Balance, December 31, 2018	$	446,318
Acquisitions	34,041
Foreign currency translation adjustments	(321)
Other adjustments	27
Balance, December 31, 2019	480,065
Acquisitions	81,990
Foreign currency translation adjustments	19,195
Other adjustments	(76)
Balance, December 31, 2020	$	581,174

Details of intangible assets other than goodwill as of December 31, 2020 and 2019 are as follows:


		December 31, 2020						December 31, 2019
	Estimated Useful Life	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Intangible assets subject to amortization:
Software and technology	3 years	$	67,691	$	(63,046)	$	4,645	$	66,063	$	(58,866)	$	7,197
Customer relationships	3-10 years	97,008		(66,030)		30,978		88,904		(59,744)		29,160
Trademarks	3-10 years	26,610		(16,888)		9,722		22,278		(12,461)		9,817
Non-compete agreements	5 years	350		(68)		282		150		(11)		139
Total intangible assets		$	191,659	$	(146,032)	$	45,627	$	177,395	$	(131,082)	$	46,313

The aggregate amortization expense for purchased intangible assets with finite lives recorded for the years ended December 31, 2020, 2019, and 2018 was reflected in our consolidated statements of operations as follows:


	Year Ended December 31,
	2020		2019		2018
Cost of subscriptions and licenses	$	4,981	$	3,795	$	2,840
Amortization of purchased intangibles	15,352		14,213		14,000
Total amortization expense	$	20,333	$	18,008	$	16,840

Amortization expense for the years following December 31, 2020 are estimated as follows:


2021	$	16,088
2022	12,975
2023	6,609
2024	3,316
2025	2,559
Thereafter	4,080
	$	45,627