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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 123R
-Paragraph A240
-Subparagraph a

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
Namespace Prefix:	us-gaap
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Share-Based Compensation (Details Textual) (USD $)	Jun. 30, 2011	Dec. 31, 2010 Incentive Plan [Member]	Sep. 27, 2008 Incentive Plan [Member]	Jun. 30, 2011 Employee Stock Purchase Plan [Member]
Additional Share-Based Compensation (Textuals) [Abstract]
Common stock authorized		7,622	4,200	1,050
Percentage increase in the number of shares authorized for issuance under the Incentive Plan		2.50%
Share-Based Compensation (Textuals) [Abstract]
Value of closing stock price	$ 14.18