Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2012

Intangible Assets [Abstract]

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

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

Schedule of Intangible Assets and Goodwill [Table Text Block]

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