Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Apr. 30, 2012	Apr. 01, 2012 Maximum [Member] M
Subsequent Events (Textual) [Abstract]
Authorized stock repurchase value	$ 25
Maximum period under stock repurchase program		18

The number of years over which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors.

No definition available.

Name:	us-gaap_StockRepurchaseProgramPeriodInForce
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant