Intangible Assets (Notes)

12 Months Ended

Dec. 31, 2012

Intangible Assets [Abstract]

Intangible Assets Disclosure [Text Block]

Intangible Assets

The following tables summarize the Company’s total purchased intangible assets (in thousands):

	Gross		Accumulated Amortization			Net
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
December 31, 2011
Purchased technology	$	114,754	$	(61,137	)	$	53,617
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

Intangible assets amortization expense was $14.8 million, $11.3 million and $6.9 million for the years ended December 31, 2012, 2011 and 2010. The Company’s purchased intangible assets have lives ranging from one to 9 years. The Company reviews for impairment 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 4 - Acquisitions.

The estimated future amortization expense of purchased intangible assets as of December 31, 2012 is as follows (in thousands):

For the Years Ending December 31,	Estimated Intangible Amortization Amount
2013	$	13,773
2014	13,281
2015	12,902
2016	12,747
2017	10,714
Thereafter	6,867
Total estimated future amortization expense	$	70,284