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Intangible assets and Goodwill
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets and Goodwill Intangible assets and Goodwill
Intangible assets at December 31, 2019 and December 31, 2018 are as follows:
(In thousands)
 
December 31, 2019
 
December 31, 2018

 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Capitalized software development costs
 
$
132,789

 
$
(76,910
)
 
$
55,879

 
$
123,842

 
$
(49,299
)
 
$
74,543

Acquired technology
 
91,900

 
(87,917
)
 
3,983

 
92,236

 
(84,962
)
 
7,274

Patents
 
35,609

 
(23,993
)
 
11,616

 
34,427

 
(21,725
)
 
12,702

Other
 
44,490

 
(31,885
)
 
12,605

 
46,437

 
(30,173
)
 
16,264

Total
 
$
304,788

 
$
(220,705
)
 
$
84,083

 
$
296,942

 
$
(186,159
)
 
$
110,783


Software development costs capitalized in 2019, 2018, and 2017 were $10 million, $15 million, and $43 million, respectively, and related amortization expense was $28 million, $27 million, and $22 million, respectively. Capitalized software development costs for the years ended December 31, 2019, 2018, and 2017 included costs related to stock-based compensation of $0.5 million, $0.7 million and $1.8 million, respectively. The related amounts in the table above are net of fully amortized assets.
Amortization of capitalized software development costs is computed on an individual product basis for those products available for market and is recognized based on the product’s estimated economic life, generally three to six years. Acquired technology and other intangible assets are amortized over their useful lives, which range from three to eight years. Patents are amortized using the straight-line method over their estimated period of benefit, generally 10 to 17 years. Total intangible assets amortization expenses were $37 million, $35 million, and $34 million for the years ended December 31, 2019, 2018, and 2017, respectively.
Capitalized software development costs, acquired technology, patents and other intangible assets had weighted-average useful lives of 2.3 years, 1.5 years, 4.9 years, and 5.1 years, respectively, as of December 31, 2019. The estimated future amortization expense related to intangible assets as of December 31, 2019 was as follows:

Amount

(In thousands)
2020
$
36,029

2021
25,463

2022
11,079

2023
4,324

2024
1,698

Thereafter
5,490

Total
$
84,083


Goodwill
A reconciliation of the beginning and ending carrying amounts of goodwill is as follows:

Amount

(In thousands)
Balance as of December 31, 2017
$
266,783

Acquisitions
2,819

Foreign currency translation impact
(5,072
)
Balance as of December 31, 2018
$
264,530

Foreign currency translation impact
(2,288
)
Balance as of December 31, 2019
$
262,242


The excess purchase price over the fair value of assets acquired is recorded as goodwill. We have one operating segment and one reporting unit. Goodwill is tested for impairment on an annual basis, and between annual tests if indicators of potential impairment exist, using a fair-value-based approach based on the market capitalization of the reporting unit. Our annual impairment test was performed as of November 30, 2019.  No impairment of goodwill was identified during 2019 and 2018. Goodwill is deductible for tax purposes in certain jurisdictions.