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Share-Based Compensation (Details Textual) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Share-based Compensation (Textual) [Abstract]
Value of closing stock price	20.94
Incentive Plan [Member]
Additional Share-based Compensation (Textual) [Abstract]
Common stock authorized	4,200	8,729
Percentage increase in the number of shares authorized for issuance under the Incentive Plan		2.50%
Employee Stock Purchase Plan [Member]
Additional Share-based Compensation (Textual) [Abstract]
Common stock authorized	1,050

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- Definition

Percentage increase in shares authorized for issuance.

+ References

No definition available.

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- Definition

Value of closing stock price.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 (a)(3)

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

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