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Identified Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]  
Identified Intangible Assets
Identified intangible assets consisted of the following (in thousands):
 
 
 
 
June 30, 2015
 
December 31, 2014
 
Average
Life
(Years)
 
Gross
Assets
 
Accumulated
Amortization
 
Net
 
Gross
Assets
 
Accumulated
Amortization
 
Net
Acquired patents / core technology
3-15
 
$
135,107

 
$
(70,572
)
 
$
64,535

 
$
132,157

 
$
(62,053
)
 
$
70,104

Existing technology
5-10
 
18,920

 
(18,530
)
 
390

 
18,700

 
(17,932
)
 
768

Customer contracts
3-9
 
8,600

 
(7,047
)
 
1,553

 
8,600

 
(6,569
)
 
2,031

Trade name
4-10
 
300

 
(289
)
 
11

 
520

 
(498
)
 
22

 
 
 
$
162,927

 
$
(96,438
)
 
$
66,489

 
$
159,977

 
$
(87,052
)
 
$
72,925
Estimated Future Amortization Expense
As of June 30, 2015, the estimated future amortization expense of intangible assets is as follows (in thousands):
2015 (remaining 6 months)
$
9,381

2016
17,994

2017
15,719

2018
13,936

2019
5,504

Thereafter
3,955

 
$
66,489