Share-Based Compensation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Share-based compensation expense
Pre-tax share-based compensation expense	$ 1,639	$ 1,490	$ 5,330	$ 4,175
Less income tax effect	(558)	(512)	(1,863)	(1,504)
Net share-based compensation expense	1,081	978	3,467	2,671
Cost of revenues [Member]
Share-based compensation expense
Pre-tax share-based compensation expense	274	246	840	772
Research and development [Member]
Share-based compensation expense
Pre-tax share-based compensation expense	646	615	2,203	1,666
Selling, general and administrative [Member]
Share-based compensation expense
Pre-tax share-based compensation expense	$ 719	$ 629	$ 2,287	$ 1,737

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration