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Share-Based Compensation Additional Information (Details)	6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Employee Stock Purchase Plan [Member]	Jun. 30, 2010 Employee Stock Purchase Plan [Member]	Jun. 30, 2011 Employee Stock Purchase Plan [Member]	Jun. 30, 2010 Employee Stock Purchase Plan [Member]	May 04, 2011 Stock Option plan 2011 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares authorized for option grants							3,000,000
Options granted	2,998,390	2,634,885
Grant of employee stock purchase rights and issuance of shares			0	0	0	0

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).

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- Definition

Number of shares issued during the period as a result of an employee stock purchase plan.

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