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Goodwill and Intangible Assets - (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill
The following table represents changes in the carrying amount of goodwill:
 
December 31,
2018
 
Additions
 
Foreign currency exchange rate fluctuations
 
September 30,
2019
 
(In thousands)
Goodwill
$
335,887

 
$
—

 
$
(1,371
)
 
$
334,516
Finite-Lived Intangible Assets
The carrying amounts and useful lives of intangible assets as of September 30, 2019 and December 31, 2018 were as follows:
 
September 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

 
$
(52,357
)
 
$
(1,480
)
 
$
81,397

 
1 - 30
Acquired technology
77,142

 
(34,213
)
 
(28
)
 
42,901

 
3 - 20
Backlog
1,150

 
(719
)
 
—

 
431

 
4
Trade names
7,650

 
(4,868
)
 
6

 
2,788

 
1 - 12
Patents
3,217

 
(1,571
)
 
—

 
1,646

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

 
$
(93,728
)
 
$
(1,502
)
 
$
129,163

 
 
 
 
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.
Future Amortization Expense for Intangible Assets
The estimated future amortization expenses for amortizable intangible assets were as follows:
 
September 30,
2019
 
(In thousands)
Remaining three months of 2019
$
4,539

2020
17,457

2021
16,125

2022
14,780

2023
13,634

Thereafter
62,628

Total
$
129,163