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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The changes in the carrying amount of goodwill for the nine months ended September 30, 2021 are as follows (in thousands):

 
Balance at December 31, 2020$427,928 
Purchase price allocation for acquisitions16,992 
Effect of foreign currency translation adjustments(6,747)
Balance at September 30, 2021$438,173 
Intangible assets
The following table presents a summary of the Company’s intangible assets that are subject to amortization (in thousands):

 September 30, 2021December 31, 2020
 Gross
Carrying
Amounts		Accumulated
Amortization		Net
Carrying
Amounts		Gross
Carrying
Amounts		Accumulated
Amortization		Net
Carrying
Amounts
Customer relationships$94,181 $(47,080)$47,101 $97,497 $(44,185)$53,312 
Non-compete agreements1,345 (848)497 1,479 (831)648 
Customer backlog1,021 (65)956 10,353 (5,941)4,412 
Trade name98 (6)92 449 (281)168 
Developed software6,821 (2,985)3,836 13,962 (8,931)5,031 
Total$103,466 $(50,984)$52,482 $123,740 $(60,169)$63,571 
Estimated useful lives of intangible assets
The estimated useful lives of identifiable intangible assets are as follows:

 
Customer relationships
5 - 10 years
Non-compete agreements
4 - 5 years
Customer backlog1 year
Trade name1 year
Developed software
1 - 7 years
Estimated annual amortization expense
Estimated annual amortization expense for the next five years ended December 31 and thereafter is as follows: (in thousands):

2021 remaining$4,512 
2022$17,496 
2023$11,885 
2024$8,730 
2025$5,566 
Thereafter$4,293