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Intangible Assets
 12 Months Ended
Dec. 31, 2011
Intangible Assets [Abstract]  
Intangible Assets Disclosure [Text Block]
Intangible Assets

The following tables summarize details of the Company’s total purchased intangible assets (in thousands):
 
Gross
 
Accumulated
Amortization
 
Net
December 31, 2011
 
 
 
 
 
Existing technology
$
96,165

 
$
(43,172
)
 
$
52,993

Technology licenses
18,589

 
(17,965
)
 
624

Patents
6,472

 
(6,454
)
 
18

Customer lists
37,000

 
(13,148
)
 
23,852

Trade names
11,536

 
(4,005
)
 
7,531

Backlog
2,127

 
(2,102
)
 
25

Total intangible assets
$
171,889

 
$
(86,846
)
 
$
85,043

December 31, 2010
 
 
 
 
 
Existing technology
$
40,915

 
$
(36,291
)
 
$
4,624

Technology licenses
18,588

 
(17,258
)
 
1,330

Patents
6,472

 
(6,314
)
 
158

Customer lists
11,500

 
(10,938
)
 
562

Trade names
3,636

 
(3,222
)
 
414

Backlog
1,538

 
(1,538
)
 
—

Total intangible assets
$
82,649

 
$
(75,561
)
 
$
7,088


Intangible assets amortization expense was $11.3 million, $6.9 million and $9.1 million for the years ended December 31, 2011, 2010 and 2009. The Company’s purchased intangible assets have lives ranging from one to 10 years. The Company reviews for impairment of all its purchased intangible assets whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.

In 2011, the Company acquired intangible assets of $89.2 million in connection with the acquisition of Continuous Computing as more fully discussed in Note 3 - Acquisitions.

The estimated future amortization expense of purchased intangible assets as of December 31, 2011 is as follows (in thousands):
For the Years Ending December 31,
Estimated
Intangible
Amortization
Amount
2012
$
14,759

2013
13,773

2014
13,214

2015
12,969

Thereafter
30,328

Total estimated future amortization expense
$
85,043