Subsequent Events (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Subsequent Events [Abstract]
Stock Repurchase Program, Authorized Amount	$ 125.0

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