Subsequent Events (Details)	Jan. 24, 2013	Dec. 31, 2012
Subsequent Events [Abstract]
Authorised to repurchase shares	2,500,000	2,500,000

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant