Common Stock (Narrative) (Details) (USD $)	9 Months Ended
Sep. 30, 2012
Common Stock [Abstract]
Shares paid for tax withholding for share based compensation	25,029
Payments related to tax withholding for share based compensation	$ 7,000

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

No definition available.

Name:	us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration