Share Repurchase (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2012
Disclosure of Repurchase Agreements [Abstract]
Stock repurchase program, Authorized amount	$ 3.0

The amount authorized by an entity's Board of Directors under a stock repurchase plan.

No definition available.

Name:	us-gaap_StockRepurchaseProgramAuthorizedAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration