Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Goodwill and Intangible Assets

Goodwill

Activity related to goodwill consisted of the following (in thousands):

	Year Ended December 31,
	2020		2019
Balance, beginning of year	$	335,564	$	327,992
Purchase price allocations for acquisitions (Note 9)	86,640		7,654
Effect of foreign currency translation adjustments	5,724		(82)
Balance, end of year	$	427,928	$	335,564

Intangible Assets with Definite Lives

Following is a summary of the Company’s intangible assets that are subject to amortization (in thousands):

	Year Ended December 31,
	2020						2019
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Customer relationships	$	97,497	$	(44,185)	$	53,312	$	82,431	$	(49,716)	$	32,715
Non-compete agreements	1,479		(831)		648		1,264		(601)		663
Customer backlog	10,353		(5,941)		4,412		1,102		(987)		115
Trade name	449		(281)		168		60		(37)		23
Developed software	13,962		(8,931)		5,031		10,984		(6,547)		4,437
Total	$	123,740	$	(60,169)	$	63,571	$	95,841	$	(57,888)	$	37,953

The estimated useful lives of identifiable intangible assets are as follows:

Customer relationships	5 - 10 years
Non-compete agreements	4 - 5 years
Customer backlog	1 year
Trade name	1 year
Developed software	1 - 7 years

Total amortization expense for the years ended December 31, 2020, 2019 and 2018 was $22.9 million, $16.2 million and $16.4 million, respectively.

Estimated annual amortization expense for the next five years ended December 31 and thereafter is as follows (in thousands):

2021	$	21,869
2022	$	15,756
2023	$	11,003
2024	$	7,971
2025	$	4,618
Thereafter	$	2,354