Intangible Assets

12 Months Ended

Dec. 31, 2011

Intangible Assets [Abstract]

Intangible Assets

3. Intangible Assets

Intangible assets are carried at cost, less accumulated amortization, as disclosed in the following tables (in thousands):

	December 31, 2011							December 31, 2010
	Gross Carrying Amount		Accumulated Amortization			Net		Gross Carrying Amount		Accumulated Amortization			Net
Core developed technology	$	52,694	$	(31,447	)	$	21,247	$	27,200	$	(26,747	)	$	453
Customer relationships		54,740		(12,209	)		42,531		3,700		(3,638	)		62
Purchase order backlog		4,260		(4,260	)		—		1,700		(1,700	)		—
Trade name		2,290		(2,290	)		—		—		—			—
Total amortizable intangible assets		113,984		(50,206	)		63,778		32,600		(32,085	)		515
In-process technology		16,270		—			16,270		—		—			—
Total intangible assets, excluding goodwill	$	130,254	$	(50,206	)	$	80,048	$	32,600	$	(32,085	)	$	515

The amortization expense was $18.1 million, $6.2 million and $6.2 million for the years ended December 31, 2011, 2010, 2009, respectively. Expected future amortization for the fiscal years indicated is as follows (in thousands):

2012	$	15,307
2013		15,307
2014		15,307
2015		15,306
2016		2,551
Total	$	63,778