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Intangible Assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets
Intangible assets are summarized as follows (in thousands):
 
Weighted
Average
Estimated
Useful Life
 
December 31,
 
2018
 
2017
Product technology
10 years
 
$
117,563

 
$
123,474

Customer relationships
11 years
 
73,260

 
73,382

Trademarks and trade name portfolios
12 years
 
7,220

 
9,606

Trade name portfolio not subject to amortization
indefinite
 
32,076

 
32,076

In-process research and development
3 years
 
6,272

 
5,602

Other
7 years
 
1,638

 
1,929

Acquired identifiable intangibles
 
 
238,029

 
246,069

Less accumulated amortization
 
 
(93,154
)
 
(80,841
)
Net acquired identifiable intangibles
 
 
144,875

 
165,228

Patents
7 years
 
6,086

 
6,112

Less accumulated amortization
 
 
(4,253
)
 
(3,399
)
Net patents
 
 
1,833

 
2,713

Acquired in-place leases and other
10 years
 
446

 
456

Less accumulated amortization
 
 
(309
)
 
(267
)
Net acquired in-place leases and other
 
 
137

 
189

 
 
 
$
146,845

 
$
168,130



During the year ended December 31, 2018, the Company recorded $2.2 million and $3.8 million of identified intangibles assets in connection with the purchase price allocation associated with Fishing Hot Spot and Fishidy, respectively. During the year ended December 31, 2017, the Company recorded $31.4 million of identified intangibles assets in connection with the purchase price allocation associated with Prox Dynamics and reclassified $8.4 million to Assets Held for Sale, net on the Consolidated Balance Sheets related to the Company's planned divestiture of the Consumer and SMB Security businesses within the Commercial business unit. During the year ended December 31, 2016, the Company acquired $47.4 million of identifiable intangible assets as part of the acquisitions of Armasight and Point Grey. Refer to Note 19, "Business Acquisitions and Divestitures" for further discussion.
The aggregate amortization expense recorded in 2018, 2017 and 2016 was $24.7 million, $27.5 million and $18.4 million, respectively. For intangible assets recorded at December 31, 2018, the estimated future aggregate amortization expense for the years ending December 31, 2019 through 2023 is approximately (in thousands):
2019
$
23,918

2020
22,049

2021
19,588

2022
18,726

2023
15,426