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Intangible assets, net
 6 Months Ended
Jun. 30, 2018
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible assets, net
Intangible assets, net  
  
Intangible assets at June 30, 2018 and December 31, 2017 are as follows:


 
June 30, 2018
 
 
(In thousands)
 
(Unaudited)
 
December 31, 2017

 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Capitalized software development costs
 
$
121,954

 
$
(36,684
)
 
$
85,270

 
$
116,691

 
$
(30,345
)
 
$
86,346

Acquired technology
 
95,776

 
(88,842
)
 
6,934

 
96,198

 
(87,341
)
 
8,857

Patents
 
33,733

 
(20,865
)
 
12,868

 
33,163

 
(19,931
)
 
13,232

Other
 
49,753

 
(33,555
)
 
16,198

 
45,565

 
(30,707
)
 
14,858


 
$
301,216

 
$
(179,946
)
 
$
121,270

 
$
291,617

 
$
(168,324
)
 
$
123,293


    
Software development costs capitalized for the three months ended June 30, 2018 and 2017 were $3.9 million and $13.7 million, respectively, and related amortization expense was $6.8 million and $5.5 million, respectively. For the six months ended June 30, 2018 and 2017, capitalized software development costs were $11.9 million and $26.0 million, respectively, and related amortization expense was $12.9 million and $10.8 million, respectively. Capitalized software development costs for the three months ended June 30, 2018 and 2017 included costs related to stock based compensation of $0.2 million and $0.5 million, respectively. For the six months ended June 30, 2018 and 2017, capitalized software development costs included costs related to stock based compensation of $0.5 million and $1.0 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 $9.0 million and $8.6 million for the three months ended June 30, 2018 and 2017, respectively, and $17.4 million and $17.0 million for the six months ended June 30, 2018 and 2017, respectively.