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Goodwill and Intangible Assets
 6 Months Ended
Jun. 30, 2019
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,
2018
 
Additions
 
Foreign currency exchange rate fluctuations
 
June 30,
2019
 
(In thousands)
Goodwill
$
335,887

 
$
—

 
$
(188
)
 
$
335,699

Intangible Assets, Net
The carrying amounts and useful lives of intangible assets as of June 30, 2019 and December 31, 2018 were as follows:
 
June 30, 2019
 
Gross carrying
amount (1)
 
Accumulated
amortization
 
Foreign currency exchange rate fluctuations
 
Net carrying
amount
 
Useful life
(years)
 
(In thousands, except for years)
Customer relationships
$
135,234

 
$
(49,999
)
 
$
(1,215
)
 
$
84,020

 
1 - 30
Acquired technology
77,142

 
(32,230
)
 
25

 
44,937

 
3 - 20
Backlog
1,150

 
(647
)
 
—

 
503

 
4
Trade names
7,650

 
(4,699
)
 
14

 
2,965

 
1 - 12
Patents
3,217

 
(1,543
)
 
2

 
1,676

 
2 - 20
Total intangibles assets, net
$
224,393

 
$
(89,118
)
 
$
(1,174
)
 
$
134,101

 
 
 
 
December 31, 2018
 
Gross carrying
amount (1)
 
Accumulated
amortization
 
Foreign currency exchange rate fluctuations
 
Net carrying
amount
 
Useful life
(years)
 
(In thousands, except for years)
Customer relationships
$
135,234

 
$
(45,029
)
 
$
(1,185
)
 
$
89,020

 
1 - 30
Acquired technology
78,122

 
(29,206
)
 
42

 
48,958

 
3 - 20
Backlog
21,350

 
(20,703
)
 
—

 
647

 
1 - 4
Trade names
7,650

 
(4,361
)
 
17

 
3,306

 
1 - 12
Patents
3,239

 
(1,488
)
 
4

 
1,755

 
2 - 20
Non-compete agreements
1,900

 
(1,900
)
 
—

 
—

 
3
Total intangibles assets, net
$
247,495

 
$
(102,687
)
 
$
(1,122
)
 
$
143,686

 
 

_________________________________________________
(1) 
The differences in gross carrying amounts between periods are primarily due to the write-off of fully amortized intangible assets.
Amortization expense of intangible assets was $4.7 million and $6.0 million for the three months ended June 30, 2019 and 2018, respectively. Amortization expense of intangible assets was $9.5 million and $12.0 million for the six months ended June 30, 2019 and 2018, respectively.
The estimated future amortization expenses for amortizable intangible assets were as follows:
 
June 30,
2019
 
(In thousands)
Remaining six months of 2019
$
9,171

2020
17,499

2021
16,171

2022
14,819

2023
13,705

Thereafter
62,736

Total
$
134,101