Equity Award Plans - Stock Options Outstanding and Vested By Exercise Price (Details) (Stock Options [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number Outstanding	3,655
Weighted Average Remaining Contractual Life (Years)	7 years 6 months 4 days
Weighted Average Exercise Price	$ 9.82
Number Exercisable	1,752
Weighted Average Exercise Price	$ 10.44
$0.20-$5.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number Outstanding	356
Weighted Average Remaining Contractual Life (Years)	2 years 7 months 10 days
Weighted Average Exercise Price	$ 2.88
Number Exercisable	355
Weighted Average Exercise Price	$ 2.88
$5.80-$10.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number Outstanding	2,195
Weighted Average Remaining Contractual Life (Years)	8 years 9 months 4 days
Weighted Average Exercise Price	$ 8.71
Number Exercisable	511
Weighted Average Exercise Price	$ 9.36
$10.81-$12.11 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number Outstanding	144
Weighted Average Remaining Contractual Life (Years)	5 years 0 months 11 days
Weighted Average Exercise Price	$ 11.73
Number Exercisable	122
Weighted Average Exercise Price	$ 11.90
$13.17-$13.26 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number Outstanding	336
Weighted Average Remaining Contractual Life (Years)	5 years 0 months 22 days
Weighted Average Exercise Price	$ 13.25
Number Exercisable	336
Weighted Average Exercise Price	$ 13.25
$13.36-$13.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number Outstanding	411
Weighted Average Remaining Contractual Life (Years)	7 years 6 months 7 days
Weighted Average Exercise Price	$ 13.53
Number Exercisable	290
Weighted Average Exercise Price	$ 13.46
$16.00-$22.97 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, End of Period [Abstract]
Number Outstanding	213
Weighted Average Remaining Contractual Life (Years)	8 years 4 months 2 days
Weighted Average Exercise Price	$ 19.10
Number Exercisable	138
Weighted Average Exercise Price	$ 19.43

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

+ References

+ Details

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-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 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-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.

+ Details

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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ References

+ Details

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- Definition

Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

+ Details

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