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Intangible assets, net
 9 Months Ended
Sep. 30, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible assets, net
Intangible assets, net  
  
Intangible assets at September 30, 2017 and December 31, 2016 are as follows:


 
September 30, 2017
 
 
(In thousands)
 
(Unaudited)
 
December 31, 2016

 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Carrying Amount
Capitalized software development costs
 
$
116,760

 
$
(32,701
)
 
$
84,059

 
$
103,887

 
$
(39,180
)
 
$
64,707

Acquired technology
 
95,963

 
(85,573
)
 
10,390

 
94,124

 
(79,485
)
 
14,639

Patents
 
32,678

 
(19,424
)
 
13,254

 
31,513

 
(17,573
)
 
13,940

Other
 
45,212

 
(30,234
)
 
14,978

 
42,848

 
(27,471
)
 
15,377


 
$
290,613

 
$
(167,932
)
 
$
122,681

 
$
272,372

 
$
(163,709
)
 
$
108,663


    
Software development costs capitalized for the three month periods ended September 30, 2017 and 2016 were $10.1 million and $9.1 million, respectively, and related amortization expense was $5.7 million and $4.9 million, respectively. For the nine months ended September 30, 2017 and 2016, capitalized software development costs were $35.8 million and $25.0 million, respectively, and related amortization expense was $16.5 million and $14.0 million, respectively. Capitalized software development costs for the three month periods ended September 30, 2017 and 2016 included costs related to stock based compensation of $487,000 and $445,000, respectively. For the nine months ended September 30, 2017 and 2016, capitalized software development costs included costs related to stock based compensation of $1.4 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 $8.7 million and $8 million for the three month periods ended September 30, 2017 and 2016, respectively, and $25.7 million and $27 million for the nine months ended September 30, 2017 and 2016, respectively.