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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill
The following table represents changes in the carrying amount of goodwill:
December 31,
2020
AdditionsForeign currency exchange rate fluctuationsJune 30,
2021
(In thousands)
Goodwill$499,309 — (43)$499,266 
Intangible Assets, Net
The carrying amounts and useful lives of intangible assets as of June 30, 2021 and December 31, 2020 were as follows:
June 30, 2021
Gross carrying
amount (1)
Accumulated
amortization
Foreign currency exchange rate fluctuationsNet carrying
amount
Useful life
(years)
(In thousands, except for years)
Customer relationships$187,889 $(70,588)$(780)$116,521 
10 - 30
Acquired technology85,666 (49,904)35,768 
5 - 20
Trade names7,000 (5,327)14 1,687 
1 - 12
Patents2,890 (1,542)1,349 
2 - 20
Non-compete agreements600 (150)— 450 3
Total intangibles assets, net$284,045 $(127,511)$(759)$155,775 
 
December 31, 2020
Gross carrying
amount (1)
Accumulated
amortization
Foreign currency exchange rate fluctuationsNet carrying
amount
Useful life
(years)
(In thousands, except for years)
Customer relationships$187,889 $(64,254)$(777)$122,858 
10 - 30
Acquired technology86,029 (44,851)41,184 
5 - 20
Backlog1,150 (1,078)— 72 4
Trade names7,850 (5,794)14 2,070 
1 - 12
Patents2,930 (1,455)1,477 
2 - 20
Non-compete agreements600 (50)— 550 3
Total intangibles assets, net$286,448 $(117,482)$(755)$168,211 
_________________________________________________
(1)     The differences in gross carrying amounts between periods are primarily due to the write-off of certain fully amortized intangible assets.
Amortization expense of intangible assets was $6.1 million and $4.4 million for the three months ended June 30, 2021 and 2020, respectively, and $12.4 million and $8.9 million for the six months ended June 30, 2021 and 2020, respectively.
The estimated future amortization expenses for amortizable intangible assets were as follows:
June 30,
2021
(In thousands)
Remaining six months of 2021$11,612 
202221,176 
202319,153 
202412,865 
202511,608 
Thereafter79,361 
Total$155,775