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Stock-Based Compensation (Narrative) (Details)	3 Months Ended
	Mar. 31, 2013 plans
Share-based Compensation [Abstract]
Number of equity-based compensation plans	1
Number of opportunities to purchase common stock at discount, per year	2
Employee stock plan purchase discount	15.00%

X

- Definition

Share-based Compensation, Common Stock Purchase Terms, Per Year

+ References

No definition available.

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- Definition

Share-based Compensation, Equity-based Compensation Plan, Number

+ References

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- Details

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X

- Definition

The discount rate from market value on purchase date that participants pay for shares.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

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