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Intangible Assets
 12 Months Ended
Dec. 31, 2013
Intangible Assets [Abstract]  
Intangible Assets
Intangible Assets

The following tables summarize the Company’s total purchased intangible assets (in thousands):
 
Gross
 
Accumulated
Amortization
 
Net
December 31, 2013
 
 
 
 
 
Purchased technology
$
114,754

 
$
(79,189
)
 
$
35,565

Patents
6,472

 
(6,472
)
 
—

Customer lists
37,000

 
(21,997
)
 
15,003

Trade names
11,536

 
(5,594
)
 
5,942

Backlog
2,127

 
(2,127
)
 
—

Total intangible assets
$
171,889

 
$
(115,379
)
 
$
56,510

December 31, 2012
 
 
 
 
 
Purchased technology
$
114,754

 
$
(70,815
)
 
$
43,939

Patents
6,472

 
(6,450
)
 
22

Customer lists
37,000

 
(17,543
)
 
19,457

Trade names
11,536

 
(4,670
)
 
6,866

Backlog
2,127

 
(2,127
)
 
—

Total intangible assets
$
171,889

 
$
(101,605
)
 
$
70,284



Intangible assets amortization expense was $13.8 million, $14.8 million and $11.3 million for the years ended December 31, 2013, 2012 and 2011. The Company’s purchased intangible assets have remaining useful lives of one to eight years as of December 31, 2013. The Company reviews for impairment all of its purchased intangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.

The estimated future amortization expense of purchased intangible assets as of December 31, 2013 is as follows (in thousands):
For the Years Ending December 31,
Estimated
Intangible
Amortization
Amount
2014
$
13,281

2015
12,901

2016
12,747

2017
10,714

2018
4,870

Thereafter
1,997

Total estimated future amortization expense
$
56,510